FAQ - Questions and answers about neodymium magnets

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Neodymium magnets are among the strongest magnets available on the market. They stand out with many advantages, making them popular in a wide range of applications:

Key features:
Extremely strong magnetic force, allowing effective attraction even from a distance.
Compact sizes, meaning even small magnets have great power.
High resistance to demagnetization under normal usage conditions.
Wide range of applications, from industrial to everyday use at home.
However, they require caution during use to avoid damage or injury.

To choose the best magnet, it's worth conducting thorough research and considering the size and attraction power. Start by estimating what shape of magnet you will need, e.g., whether you want to use a cylindrical magnet or a magnet with a hole. Remember, a larger magnet is stronger but may also be more dangerous to use. Next, focus on the load-holding capability, which is crucial for selecting a magnet for your project. For more information on attraction power, refer to the product specifications.

Magnets are essential in many projects, both for improving home functionality and as part of products for sale. In some cases, they need to be glued. Here are some tips to help you succeed on the first try.

Application tips:
Always read the instructions for the glue you are using.
Before applying the glue, make sure the surfaces are clean. Residues, grease, or dirt can create a barrier that prevents proper adhesion of the magnet.
It is recommended to sand smooth magnet surfaces to improve glue adhesion.
Gluing magnets to plastic can be more difficult due to issues with achieving proper glue adhesion. Consult the glue manufacturer's technical support for advice on plastics.
The best choice of glue is two-component epoxy resin, which works well in most cases. Recommended glues include: Loctite Plastic Bonder Epoxy, E6000 Adhesive, Super Glue, Gorilla Glue, and many others.
Avoid using hot glue guns as the high temperature can demagnetize the magnets.

For license plate mounting, it is recommended to use two magnets MPL 40x18x10 / N38 - lamellar magnet under the bumper and two magnets MPL 40x20x5 / N38 - lamellar magnet under the license plate. It is important to attach a thin sheet of metal under the plate, which will cover the magnets and protect them from detaching due to heat and vibrations. Since license plates are made of aluminum and are non-magnetic, the metal sheet helps keep the magnets in place. Additionally, the rivets on the plate can create the illusion that the plate is permanently attached, which enhances security against theft.

Magnets attract iron because iron is a ferromagnetic metal. The atomic makeup of iron allows strong bonding with the magnetic field of the magnet.

Magnets usually do not attract aluminum because aluminum is not magnetic materials. However, in specific cases, such as the presence of strong magnets, aluminum can exhibit minor reactions.

Magnets attract metal because some metals, such as nickel, have ferromagnetic characteristics. When a neodymium magnet approaches a iron surface, magnetic polarizations are created, which pull the magnet to the metal.

Use a compass: A simple method is to use a compass. Be careful not to bring the compass needle too close to the magnet to avoid damaging the compass. The compass needle points to the physical 'S' magnet pole.
Use a smartphone app: There are apps that help identify the poles of a magnet.
Use a teslameter: A teslameter measures magnetic induction and shows which pole is which.
Magnetic pole detector: You can also purchase a pole detection device that will help you easily identify the poles. For more information on magnetic directions, visit NS magnets.

To magnetize a neodymium magnet, a process called "magnetic induction" must be performed. There are several ways to magnetize a magnet:
Using a strong neodymium magnet: Place the magnet next to a strong neodymium magnet, ensuring the poles of the magnets touch.
With a flow of electricity: Connect the magnet to electrical wires, which causes the electric current generates magnetism in the magnet.
With a specialized device: Magnetic induction devices available in electronics stores allow you to magnetize a magnet using a strong magnetic field.

Important: Magnetizing a neodymium magnet can be difficult if the magnet is weakened or distorted. More information on magnetization methods and pole directions can be found in our technical guide.

A magnet and a magnetic holder differ in construction and purpose. A magnet is a component made from a magnetic material that attracts ferromagnetic metals such as steel, iron, nickel, cobalt. It is used in various fields such as electronics, medicine, automotive.

A magnetic holder is a magnet with an enclosed casing that protects it from damage, such as mechanical damage. Thanks to its special design, the magnetic holder may include additional features like threads or handles, making installation and use easier. The main advantage of magnetic holders is their higher load capacity, but their range of action is limited. For more information about magnets and magnetic holders, visit technology.

To remove dents from car sheet metal, several methods can be used. One is using a magnet in conjunction with a large ferromagnetic ball on the other side of the sheet. This allows leveling the sheet, but this method is only effective if the sheet is thicker than 0.6 mm.

Another method is the PDR technique (Paintless Dent Repair), which involves straightening the sheet using a special kit (cost approx. 500 PLN). This labor-intensive method allows for dent removal without the need for repainting.

Alternatively, a PDR 1000 device can be used, which generates a magnetic field and is dedicated to removing dents from steel bodies. This solution is fast and effective, and is perfect for automotive workshops. For more information about magnets, visit our technology guide.

The magnet RM R6 GOLF - 13000 Gs / N52 - magnetic distributor from DHIT is one of the best magnets for anti-theft clips, with a strength of 12000 - 13000 GS. Thanks to its unique "cylinder" shape with a recessed center, the magnet works effectively on clips of various shapes, allowing for quick and easy removal. The magnet is easy to handle and convenient, and its installation on a counter is very easy. This is a modern and effective tool recommended for stores, such as secondhand clothing stores. Ideal for sellers who value effectiveness and speed. For more information on anti-theft clip removal magnets, visit anti-theft clips.

No, you should not solder or weld neodymium magnets. High temperatures generated during soldering or welding demagnetize neodymium magnets, leading to loss of their magnetic properties. Additionally, there is a risk of fire during the process. Burning magnets leads to the emission of toxic gases, which poses a health hazard and can lead to toxic poisoning. Instead, use appropriate techniques that do not affect their magnetism.

Separating strong neodymium magnets requires delicacy and skill. The best way is to utilize tools such as plates or dedicated magnet separators.
Start by shifting one magnet to the side, instead of pulling it directly. Secure the magnets to prevent them from uncontrolled attraction. Details available on the separation tools page.

For cutting and grinding neodymium magnets, special diamond discs with water cooling are used. This process requires precision and experience. For more information, visit the diamond tools page.

Yes, connecting magnets can increase their attraction strength, but only under specific conditions. However, the effect is limited by the physical properties of the magnetic materials.

No, a single magnet cannot effectively substitute a advanced magnetic separator. Although theoretically this is feasible, in reality using a single magnet instead of a specialized magnetic separator will prove ineffective. Magnetic separators are advanced devices that are customized to specific requirements and working conditions, often equipped with cleaning systems and fastening components. In certain industries, where there are specific requirements for cleaning products using a magnetic field, applying a single magnet instead of a separator will not be enough, but also cause penalties during inspection by auditors.

Magnets are incredibly versatile tools used in many areas of life and industry:

Examples of applications:
Home: Tool organization, photo mounting, or creating magnetic closures.
Office: Magnetic boards, document holders, organizers.
Industry: Metal separation, mounting components, electric motors.
Education: Physics experiments, teaching magnetism principles.
Hobbies and art: Creating decorative magnets, modeling, DIY projects.

Fridge magnets are mainly made of magnetic foil, which can be easily cut and decorated. Another popular material is epoxy resin, used for aesthetic finishes. Fimo allows for handmade magnets, while photographic paper is used for creating photo magnets. Additionally, industrial glues are often used in the production of magnets to attach decorative elements.

Neodymium magnets are widely used in various fields such as electronics, the automotive industry, medicine, agriculture, and more. They can be found in speakers, electric motors, magnets used in the treatment of diseases, and even in magnets used in agriculture for guiding machinery.

Neodymium magnets find applications in electronics, medicine, and the automotive industry, such as audio device production, electric motors, and also medical therapies.

Neodymium magnets are widely used in industry, electronics, and medicine. They are used in converters, wind turbines, and surgical tools. For more examples, visit the magnet applications page.

Magnets stick to refrigerators because a large portion of refrigerators have steel surfaces. Iron elements of refrigerators function as magnetic conductors, which allows magnets to stick.

If you need a strong magnet with a handle, pay attention to models from the UMP series, such as:
Magnet UMP 67x28 [M8+M10] F120 GOLD, ideal for work with kids,
Magnet UMP 75x25 [M10x3] F200 GOLD, a universal choice with a 290 kg lift,
Magnet UMP 94x28 [M10] F300 GOLD, for more demanding tasks.
For more information, visit the what magnet for searching page.

Primarily, the key users of magnets are businesses manufacturing measuring equipment, electronics, electrical devices, automotive companies or producing various industrial machines. Magnetic capabilities are also highly valued by the furniture sector, clothing industry, in particular related to medical apparel, distributors of closures for handbags, wallets and the advertising industry.

Making your own fridge magnets is easy. You need any magnet, glue, and a decorative surface (e.g., a wooden figurine). Attach the elements with glue and you're done!

The force of interaction between two magnetic poles is a key aspect of magnet functionality, which can be easily observed in practice:

Basic principles:
Opposite poles (N and S) attract, creating a stable connection.
Like poles (N and N or S and S) repel, making it difficult to bring them together.
The force of interaction depends on the distance between the poles and the power of the magnets.
Magnetic fields can affect conductors as well as some electronic devices, so caution is advised.
Proper utilization of magnetic poles enables effective applications in technologies such as electric motors and separators.

The earliest documented studies and tests on alloys suitable for the creation of high-strength magnets had their origins over 50 years ago. It was then, two researchers, G. Hoffer and K. Strnat from Air Force Materials Laboratory in Dayton started research on magnetic materials constructed using metals forming part of the so-called group of rare metals. Initially, first alloys that were intended for manufacturing high-strength magnets consisted of iron, cobalt, and a selection of lanthanides, including: praseodymium Pr, neodymium Nd, cerium Ce, samarium Sm, lanthanum La, and yttrium Y. These relatively unknown metals exhibit distinctive properties, such as strong magnetization potential, yet they suffered from a very low Curie temperature. Today’s high-strength magnets are composed of iron alongside but also light lanthanides, allowing for a high level of magnetocrystalline anisotropy, and furthermore, a few percent cobalt is added to increase the too-low Curie temperature. The debut high-power magnets were formulated at the beginning of the 1970s utilizing samarium in powdered form together with a few additional lanthanide compounds. Thus, the first powerful magnet type SmCo₅. The manufacturing process was founded on orienting alloy particles in finely ground material under the influence of a magnetic field in the sintering stage. The formation of finished magnets took place in extreme conditions of approximately 1120°C followed by final annealing at a temperature 250°C lower. The final step of manufacturing of a high-energy magnet involved magnetizing the material in a high magnetic field of 2T. By employing this technique, the Curie temperature of the newly developed magnets increased to 745°C.

While they were being designed subsequent high-power magnets utilizing samarium, in the early 1980s it was discovered interesting magnetic characteristics of the neodymium compound with the addition of boron and iron. General Motors a year after the discovery created compound with the formula Nd₂Fe₁₄B, composed of 15% neodymium, 6% boron and over 70% iron. The technology of producing powerful neodymium magnets is based on two methods. The Sumitomo plant in Japan, which is part of Hitachi, analogously as the process of creating magnets based on samarium, used a method of sintering powdered substances, which allowed to obtain.

In America powerful neodymium magnets were created in the plants of GM by means of a method of very rapid cooling of a liquefied mixture of powders. Why the use of iron, neodymium and boron provided much greater efficiency? Using neodymium was much more cost-effective than in the case of samarium, and besides neodymium is characterized by much better magnetic parameters. Unfortunately the Curie temperature of this element was not at an appropriate level, which is why it was decided to raise this temperature to 530°C. Such a high level was obtained by means of adding a boron to the composition of the neodymium magnet. Additionally it is also possible alter the magnetic parameters of the magnet by incorporating other constituents, like gallium Ga, copper Cu, niobium Nb plus aluminum Al.

Neodymium magnets are today the most potent types of magnets that have been invented to date. In 1990, at Trinity College in Dublin, Michael Coey developed a completely new magnetic material with the chemical structure Sm₂Fe₁₇N₂. The process of creating this material used synthesis of powders of samarium and iron, which during compaction in a high-intensity magnetic field together with the addition of nitrogen, achieving a Curie temperature range of 470°C and magnetization near 0.9T. These are not results comparable to neodymium magnets, yet the newly developed composition of samarium actually far surpassed the first magnets made from this element. The end of the 20th century brought next ideas in the field of high-power magnets and ways of their creation.
A material with a nano-crystalline structure was researchers developed, made of microscopic grains with a size smaller than 100 nm. The grains discovered during the research nano-crystalline, in contrast to the monocrystalline structure are separated from each other space with higher surface magnetic power as well as more uneven internal structure. By applying, at the stage of production alloy of elements from the rare earth group along with an iron additive, they feature a high level of magnetic remanence. Very good magnetic characteristics also come from another important factor, that is the coupling of magnetic moments neodymium with iron. This enables excellent magnetizing neodymium-based magnets.

Currently neodymium magnets are manufactured primarily on the Asian continent. The primary producer and also exporter of these types of goods have become China, due to control of most resources of necessary elements. For industrial manufacturing strong magnets two types of compounds are applied: Sm₂Fe₁₇N₂ and Nd₂Fe₁₄B. These are neodymium magnets and nano-crystalline magnets, characterized not only high magnetization, but also high remanence. The use strong neodymium magnets is extremely versatile. The main clients are businesses manufacturing, offering electrical and electronic equipment, in particular companies in the automotive industry, using very efficient hybrid and electric motors. For the production such motors neodymium magnets are applied from a mixture with compounds reducing efficiency losses of magnets at high temperatures such as dysprosium (Dy) or Terbium (Tb). Through the use of the above-mentioned substances, magnetic coercivity has been greatly improved and also overall efficiency magnets applied in electrical devices with greater nominal power. In the United States for many years now research has been conducted by the specialized REACT Institute, which is responsible for developing modern alloys and materials. Several years ago, ARPA-E allocated 31.6 million dollars for financing projects and studies under the program on rare-earth substitutes, with the goal of creating alternatives to metals as a replacement for natural deposits of elements, which are under China's control.

The production neodymium magnets was based on two technologies. Japanese companies use a method of sintering ferromagnetic powders, while in the United States fast cooling has become popular. Depending expectations, neodymium magnets can also be produced using other elements, such as aluminum, gallium or copper. Thanks to such combinations it is possible to significantly regulate magnetic parameters of the magnet, its resistance, and also resistance to high temperatures. It is even possible to make the magnet resistant to harsh atmospheric conditions, such as water, which can cause corrosion. However systematic refinement of powder metallurgy has contributed to developing new material alloys, which significantly affected the rise of the Curie temperature. Created using a modern manufacturing method a neodymium magnet, can achieve magnetization exceeding 1.6T, meaning far higher than Earth's magnetic field.

A neodymium magnet is the strongest permanent magnet available on the market. Its extraordinarily high magnetic strength comes from using an alloy of iron, neodymium, and boron to form a tetragonal crystal structure of Nd₂Fe₁₄B. Such a combination of elements provides unprecedented magnetic properties, including exceptionally high magnetic anisotropy.
Neodymium magnets are typically produced as sinters, but it is also possible to produce neodymium magnets as so-called bonded magnets, using plastics or resins as a binder.

Neodymium magnets are sintered material made from iron, boron, neodymium, and other additives. The production process begins with choosing the correct amounts of each element, which are melted and then cast. The resulting plates are crushed by a hydrogen method and then ground into a powder. The powder obtained this way is subjected to a densification process. The material is formed by a pseudo-isostatic method under high pressure, which enables achieving high density and uniformity. During the forming process, the material gets magnetized using a magnetic field, which determines the magnetization direction for anisotropic magnets or without a magnetic field for isotropic magnets. Then, the shapes are sintered, and after this step, they undergo mechanical and surface treatment (including protecting with protective layers). Finally, the finished product is magnetized in a magnetizer, becoming a magnet.

Rare earth magnets are magnets that contain at least in part metals known as rare earth elements. This group of elements includes: scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. The most famous of these elements for any magnet user are of course neodymium, which is used for the production of NdFeB magnets, and samarium, which is used for the production of SmCo magnets. Rare earth elements are not actually scarce in the Earth's crust. In fact, they are quite abundant, but their deposits are typically scattered and sparse, making it unprofitable to mine them. For this reason, they were called 'rare earth elements.'

Of course, the strongest will be the magnet with the highest magnetic properties (e.g. N54 magnet). However, such materials are much more expensive than standard ones. A higher magnet will work at a greater distance, the magnetic field lines will emerge from the pole surface and shoot upward, and there is a chance of attracting an iron piece or another magnet from a longer distance. On the other hand, a flat magnet in practice will have greater lifting capacity, able to hold and lift elements with a larger surface area and dimensions.

Symbols used for neodymium magnets include letters and numbers, where letter symbols like M ('medium'), H ('high'), SH ('super high'), UH ('ultra high'), EH ('extra high') indicate the resistance strength of the magnet to demagnetization caused by high temperature or influence of opposite magnetic fields, and numbers like 35, 38, 42, 45, 48, 50, 52 represent the magnetic energy density of the magnet in units of MGsOe. For example, marking N52SH indicates that this is a neodymium magnet with a magnetization of 52 Mega Gauss Oersteds - (MGsOe) and extraordinary resistance to demagnetization (SH stands for 'super high').

Neodymium magnets are typically available in simple shapes such as: cylinder, as well as a ring, meaning neodymium cylinders with a hole. These are commonly referred to as ring magnets, but it should also be noted that both flat and ring magnets can be made with specially chamfered holes to allow for the embedding, flush with the surface, of a screw or bolt head. There is also the option to make neodymium magnets in the shape of a sphere, as well as so-called segmented (arc) magnets, which are cut sections of a ring. You can also order magnets in shapes like trapezoids or other geometric figures, provided that the shape can be cut with an electrodischarge machine without breaking the magnet's shape during the process. The brittleness of neodymium magnets limits the ability to produce complex shapes, for example, threads cannot be directly made in the magnet itself.

Neodymium magnets made from the compound Nd₂Fe₁₄B are sintered made from iron, boron, and neodymium. In reality, the composition of a neodymium magnet contains only about 30% neodymium, and thanks to its atomic structure, these magnets are so powerful.

To magnetize a magnet, magnetic devices are used, which are devices where a sufficiently large static electromagnetic field can be generated. After increasing the field (current intensity) to a point called saturation, further increases are ineffective as they do not enhance the magnetic induction of the magnet. The external field is then reduced to zero. The properties of neodymium magnets, made from magnetically hard materials, ensure that after the field is turned off, the magnetization value does not drop to zero but stabilizes at the point Br, which is called remanence induction, or the point of residual magnetism. The magnetizing process is best described by the first quadrant of the magnetic hysteresis loop.

Yes, there are several ways to demagnetize neodymium magnets. The simplest method is to heat the magnet first above the defined maximum working temperature for the magnetic material, usually around 80 degrees Celsius, which will cause partial demagnetization, and then heat it above the Curie temperature, at which point the ferromagnetic material becomes paramagnetic, resulting in complete demagnetization. Other methods for demagnetizing neodymium magnets include applying a sufficiently large constant and opposite magnetic field or subjecting the magnet to an alternating magnetic field.

Neodymium magnets are widely used in many electrical devices: gauges, doorbells and locks, televisions, motors. The main industries where neodymium magnets are used include: automotive.

The most important criterion for selecting neodymium-based magnets will be their application. Factors to consider include operating temperature, weather conditions, and finally, the force with which the magnet is supposed to work. The strength of neodymium magnets is often given as lifting capacity in kilograms. It is important to note that this value is measured in laboratories, under ideal conditions, with perfect contact between the magnet and the ferromagnetic substrate, and the direction of the force is perpendicular to the contact surface of the magnet. In case of doubts, please contact the advisors at Dhit sp. z o.o. via the phone listed under contact.

Neodymium magnet strongly attracts primarily iron and all alloys containing it, as well as metals like gadolinium, nickel, erbium, cobalt, and dysprosium. Whether a particular element is more or less easily attracted by a magnet also depends on the shape of the element. In a long element, such as an iron nail, when it is magnetized by the magnetic field of a permanent magnet, the poles will quickly form, meaning that one end of the nail will be ‘N’ and the other ‘S’. However, if the same nail is melted and shaped into a ball, it will be more difficult to pick it up using a magnetic field, particularly when the ball is in motion.

No, it will not double.
The magnetic flux density is the amount of magnetic flux per unit area. While the flux density will become slightly stronger when two magnets are placed vertically on top of each other, since the surface area remains the same, there will be no significant difference. For example, if two magnets of size MW 10mm x 10mm are placed on top of each other, the magnetic flux density will be almost the same as for a single magnet of size MW 10x10 mm.

Magnetism is permanent. Strictly speaking, magnetism weakens over the years, but the demagnetization is so minimal that even after several decades, no significant weakening is felt. Therefore, neodymium magnets are generally considered insensitive to demagnetization and are called permanent magnets. Demagnetization is more likely to occur due to temperature changes and repulsive load rather than the passage of time. Magnets made from Alnico material may require remagnetization because they are more prone to demagnetization due to repulsive loads.

Magnesium is a chemical element with the symbol Mg, known for its exceptional properties such as lightness and corrosion resistance. In the context of interaction with magnets, the situation is more complex compared to ferromagnetic materials like iron or nickel.

Key points:
Magnesium is paramagnetic, meaning it reacts to a magnetic field, but the force of attraction is very weak.
Under normal conditions, magnets do not noticeably attract magnesium, as its paramagnetic properties are insufficient to create a significant force.
To observe the paramagnetism effect of magnesium, a very strong magnetic field and specialized equipment are needed.
Magnesium differs from materials like iron, cobalt, and nickel, which are ferromagnetic and strongly react to magnets.
Due to its properties, magnesium is used in various industries, but it is not used as a magnetic material.

Magnets are essential components of many devices and technologies, but how are they actually made? The process of creating them depends on the type of magnet we want to produce – permanent magnets, electromagnets, or temporary magnets. Here is an overview of the key stages of production.

Magnet manufacturing process:
Material selection: Permanent magnets are made from ferromagnetic materials such as iron, nickel, cobalt, or neodymium-iron-boron alloys (NdFeB).
Shaping: The material is shaped into the desired form through casting, sintering, or pressing magnetic powders.
Magnetization: The finished component is subjected to a strong magnetic field, which causes the magnetic domains in the material to align, giving it magnetic properties.
Finishing: Depending on the application, magnets can be further ground, coated with protective layers, or finished in other ways.
Quality control: Each magnet is tested for its magnetic properties and durability to meet user requirements.
Electromagnets: In the case of electromagnets, the process involves winding a conductor around a ferromagnetic core and connecting it to a power source.

Magnetic field therapy is an alternative healing method that is gaining popularity, though it still generates controversy. It involves using magnets or devices generating a magnetic field to improve health.

Key facts:
Magnetic therapy is primarily used for pain relief, tissue regeneration, and improving blood circulation.
There is research indicating that low-frequency magnetic fields may support the treatment of inflammation, bone fractures, or carpal tunnel syndrome.
The effectiveness of magnetic therapy has not been scientifically proven, and expert opinions are divided.
This therapy is generally safe, but may not be suitable for individuals with pacemakers, metal implants, or during pregnancy.
Always consult with a doctor before starting magnetic field therapy, especially in the case of serious conditions.

Neodymium magnets are the most advanced and powerful permanent magnets, differing from traditional magnets in several ways.

Differences between magnets:
Magnetic strength: Neodymium magnets (NdFeB) are several times stronger than traditional ceramic or ferrite magnets.
Composition: Made from neodymium, iron, and boron, whereas traditional magnets are usually ferrite.
Size: Neodymium magnets can be very small yet extremely strong.
Application: Neodymium magnets are used in modern technologies such as electric motors, hard drives, and medical devices.
Durability: Neodymium magnets are more brittle and less resistant to high temperatures than ferrite magnets, requiring protective coatings.

The strongest magnets available on the market are neodymium magnets (NdFeB). They are widely used in technologies requiring high magnetic strength.

Why are neodymium magnets the strongest?
High magnetic strength: They are capable of generating a very strong magnetic field, even in small sizes.
Modern technologies: Used in devices like electric motors, wind turbines, and speakers.
Compactness: Due to their strength, they can replace larger and weaker magnets.
Alternative: Another type of strong magnet is samarium-cobalt magnets (SmCo), which are more resistant to high temperatures but less common and more expensive.

Anisotropic magnets are formed in the presence of a magnetic field, which aligns the material along the field lines. These magnets are magnetized in one direction, making them more powerful. In contrast, isotropic magnets do not require an external field, and their magnetization occurs only at the end of the process. They are weaker, but can be magnetized in any direction, allowing for creating magnets with multiple poles.
More information on magnetic materials can be found on the technology page.

Neodymium magnets are among the strongest permanent magnets. Neodymium magnets define three key parameters that affect their properties: remanence, coercivity (Hc), and maximum energy product (BHmax).

Remanence (Br) is the maximum magnetic induction that the magnet can retain after the magnetic field is removed. Neodymium magnets typically have a Br value ranging from 1.1 to 1.4 T.

Coercivity (Hc) is the magnetic field required to erase the remanent magnetization. Coercivity of neodymium magnets ranges from 800 to 2000 kA/m.

Maximum energy product (BHmax) is a measure of the energy a magnet can deliver per unit volume. For neodymium magnets, BHmax typically ranges from 200 to 400 kJ/m³.

These parameters are measured using specialized devices such as gaussmeters, teslameters, and magnetometers. More information can be found on the technology page.

The density of a neodymium magnet is an important technical parameter that determines its mass relative to its volume. The higher the density, the stronger the neodymium magnet.

Here are density values for various magnetic materials:
Water: 1.0 (reference value)
Ferrite magnet: around 4.8
Neodymium magnet: around 7.5
Alnico magnet: around 7.3
Iron: 7.9

Neodymium magnets are denser than other magnetic materials, making them ideal for various industrial uses such as motors and generators.

Neodymium magnets, also known as neodymium-iron-boron magnets, were invented by a team of scientists from Japan in 1984. The team included Shunichi Miyazawa, Kiyoshi Watanabe, and Jiro Fujita. The discovery took place at the Rare Earth Research Institute in Japan.

Neodymium magnets became a technological breakthrough due to their high magnetic strength and relatively low mass compared to traditional magnets. As a result, they have found widespread use in many industries, including electronics, automotive, and medicine.

There are no materials that can completely block a magnetic field, but there are materials that can significantly reduce its impact. These materials are called magnetic shields.

The most commonly used material for shielding is iron, which has very high magnetic permeability. Other materials, such as stainless steel, cobalt, nickel, or copper, can also act as magnetic shields, but their effectiveness is lower.

Shielding works by placing a material with high magnetic permeability between the source of the field and the protected area. Such materials create a Faraday cage, which changes the direction of the magnetic field lines and reduces their effect on the protected space.

Yes, every magnet has at least two magnetic poles. Modern magnets can be magnetized multipolar, meaning they can have many pairs of poles. The technical designation of such magnets is 6-pole, which refers to one, two, or three magnetic poles.

Isotropic magnets, formed without a magnetic field, can have multipolar structure. Anisotropic magnets, which are formed in a strong magnetic field, can also be magnetized multipolar, but only in a specified direction.

Every magnet always has an even number of poles, which is essential for its operation.

Magnets vary in their resistance to high temperatures. Here are the temperature ranges for different types of magnets:
Ferrite and samarium-cobalt magnets - from -60°C to 250°C.
Neodymium magnets - depending on the type, from -130°C to 80-230°C.
Alnico magnets - can withstand temperatures up to 550°C.

All magnets tolerate low temperatures well, but higher temperatures can lead to demagnetization. It is important to remember that overheating can result in a loss of attraction force and demagnetization.

A magnetic separator is an complex device consisting of multiple magnets that work in magnetic circuits. These circuits increase the magnetic field strength in selected areas. While it is possible to use a magnet instead of a separator, this will be an inefficient option. Magnets without additional components are less effective. A magnetic separator is designed for working conditions and ensures high efficiency. More information about magnetic separators can be found on the magnetic separator page.

Yes, it is possible to make a one-sided magnetic roller that works as a filter in a heat pump. Magnetic rollers are made from neodymium magnets placed inside a steel tube, which allows fluid to flow in only one direction. These rollers are widely used in heating systems, heat pumps, and other industrial devices to remove contaminants from fluids.

More information about magnetic separators can be found on the magnetic separator page.

Neodymium magnets attract ferromagnetic metals such as iron, nickel, and cobalt. Iron, nickel, and cobalt are strongly attracted to neodymium magnets. Steel is also attracted by magnets, as it has ferromagnetic properties. Materials that do not respond to magnets include stainless steel 304 and acid-resistant steel 316L, often used in dental industries.

Symbols of neodymium magnets include letters and numbers that define its strength and properties. Letters such as M – "medium", H – "high", SH – "super high", UH – "ultra high", EH – "extra high" indicate coercivity. Numbers like N35, N42, N52 define magnetic energy density, expressed in MGsOe. For example, N42SH means a magnet with a magnetic energy density of 42 MGsOe and very high coercivity. More information about magnets and their markings can be found in our technology guide.

Neodymium magnets do not affect pure gold (Au), aluminum (Al), and copper (Cu). These metals repel magnets in the presence of an alternating magnetic field due to eddy currents. However, neodymium magnets attract ferromagnetic metals such as iron (Fe), nickel (Ni), cobalt (Co). More information about magnets and their properties can be found on the technology page.

A permanent magnet, also known as a hard magnet, is a material with a high coercivity that, once magnetized, does not lose its magnetic properties. After applying the appropriate magnetic field, the magnetic domains in the material align in one direction and remain in that position even after the field is turned off. Permanent magnets have coercivity HcJ of at least 24 kA/m, and the greater the coercivity, the greater the resistance to demagnetization. Such magnets are used in electrical devices, where resistance to demagnetization is crucial. More information about magnets can be found on the technology page.

A magnet attracts iron because iron is a ferromagnetic metal that possesses internal magnetic strength. Ferromagnetic materials like iron, nickel (Ni), and cobalt (Co), have magnetic domains that direct their fields in one direction. When a magnet approaches iron, its magnetic field strengthens the magnetic fields of iron, increasing the attraction force.

Magnetic domains in ferromagnetic materials are small fragments where the magnetic field is directed in one constant direction. When a magnet is brought near, it strengthens the magnetic field in selected domains, causing the rest of the domains to orient in the direction of the magnet's field, making iron attracted to the magnet.

No, both N and S poles of a magnet have the same strength.
More about poles can be found on the enes magnet page.

Magnets are frequently applied in bodywork repairs. This method requires a large metal ball and a neodymium magnet, allowing the dents to be removed without painting. Detailed information on the technology page.

Neodymium magnets are durable, losing less than 1% per decade, as long as they are exposed to high temperatures or moisture. Storing them in a dry environment increases their lifespan.

The sliding force of a magnet is the amount of energy needed to slide the magnet along a surface. It depends on the surface material and the magnet's strength. Check the calculator.

Magnets attract each other when their north and south poles are directed towards each other. This is the basic principle of magnetism, causing the magnetic force to act.

Neodymium magnets typically withstand temperatures from -130°C to up to 230°C, depending on the applied grade.

To boost its magnetic power, you should avoid high temperatures, use an external magnetic field, and arrange the magnets in multi-pole configurations.

Neodymium magnets can retain their magnetic strength for many years, provided they are used correctly.

Neodymium magnets have minimal power loss. The loss is less than 1% per 10 years, as long as they are stored in appropriate conditions. More information can be found in the magnet durability section.

Neodymium magnets are classified under PKWiU in category 26.80.99, which includes magnetic products. Detailed information can be found in the PKWiU magnets section.

"Magnetization through thickness" refers to the process in which the magnetic field passes through the thickness of the magnet, rather than through the length or width. This type of magnet are popular in technological applications, where strength in a particular direction is necessary.

Blocking the effect of a magnetic field requires the use of materials like soft steel, which absorb the magnetic forces. No material that completely blocks a magnetic field, but certain substances can reduce its effectiveness. More information can be found on the materials for blocking fields page.

Neodymium magnets are protected to prevent corrosion, especially in humid conditions. The most popular coatings are nickel-copper and gold, which increase durability of the magnets. Learn more about coatings on the magnet coatings page.

Magnets repel each other when their similar poles are set towards one another. This phenomenon results from the principles of electromagnetism. When the north pole of one magnet is facing towards the north pole of another (or the south pole towards the south pole), these magnets do not attract. This is a fundamental principle of magnetism.

Neodymium magnets are compounds made of neodymium, boron, and iron. Their tariff code is 8505199089. This means they are classified as magnets in the international customs coding system. It is important to note that the production of these magnets is globally widespread, with China being the main producer. Neodymium magnets are also made in countries such as the United States, Russia, and others to meet the growing demand for these exceptionally strong magnets. Before importing, it is worth verifying customs rates in the ISZTAR or TARIC systems and making sure that the product meets certification requirements (e.g. CE, RoHS), especially if it comes into contact with food or skin.

The poles of a magnet can be determined using a magnetic tester or Hall sensors. In a compass, the needle points to the north pole and S. More information can be found in the magnetic field section.

Temperature affects the magnetic properties of magnets. Neodymium magnets may lose strength above the Curie temperature. The operating range is from -130°C to as high as 230°C, depending on the type of magnet.

Neodymium magnets are coated to prevent corrosion to increase their durability. The most commonly used coatings are nickel-copper, which increase resistance to moisture. Learn more in the technology section.

Neodymium magnets can be damaged by moisture. Long-term exposure with water can lead to oxidation, if the magnet has the proper protective coating. More on protecting magnets from moisture can be found in the moisture protection section.

Neodymium magnets are primarily composed of neodymium, iron, and boron. Without protection, their iron quickly corrodes, especially in moist environments. To prevent this, most neodymium magnets are coated with a protective layer, most commonly nickel, which protects them from oxidation. Plastic and gold coatings are less common, but also effective.

Neodymium magnets are extremely strong, far stronger than other types of magnets. Their strength creates potential risks if not used properly. In larger sizes, they can cause serious injuries, if body parts get trapped between them. Always take precautions to prevent injury. Watch this video to see examples: YouTube.

Magnets can disrupt the operation of smartphones, especially in the case of strong neodymium magnets. They interfere with compasses, Hall sensors, and even display elements.

For safety, avoid storing your phone near strong magnets. More information can be found on the dangerous magnets page.

Processing neodymium magnets carries risks. The shavings and small particles contaminate devices, which damages the equipment. The specific structure of the magnets makes the process more demanding.

Most foreign objects, like magnets, are swallowed without complications and pass through the digestive tract. 80-90% of cases result in natural expulsion within a short time. If a child swallows only one magnet or coin, giving them plenty of fluids and bread will help with the natural expulsion. In case of swallowing two magnets, a problem may arise as they can magnets may combine in the digestive tract. In such a case, you should consult a doctor and take an X-ray to check their location and condition.

The most important thing is to remain calm and wait for the natural process, rather than seeking immediate help. More information can be found on the dangerous magnets page.

The neodymium magnet was invented by Japanese scientist Sagawa Masato. He was the first to undertake research related to the magnetic features of rare earth elements, conducting his work at Fujitsu Laboratories for about 10 years. Later, moved to Sumimoto Special Metals, and it is claimed that it was there, in the early 80s, that he finally developed the technology and created the modern sintered neodymium magnet based on the compound Nd₂Fe₁₄B. Since then, we have seen rapid development in this field.

Choosing the right neodymium magnet depends on many factors that are worth considering to ensure its effectiveness and safety:

Selection tips:
Magnetic force: Consider how much power is required for your application.
Size and shape: Ensure the magnet fits the space where it will be used.
Protective coating: Choose a magnet with a corrosion-resistant coating, such as nickel-plated.
Operating temperature: Neodymium magnets may lose their properties at high temperatures.
Application: Check if the magnet meets the requirements for industry, electronics, or household use.

Magnets on the fridge can be considered harmful due to the possibility of scratching the surface of the fridge, especially when they are regularly moved. Moreover, very strong magnets potentially affect the electronics in some fridges.

Magnets should be removed from the fridge if they cause damaging its surface. Furthermore, very strong magnets potentially cause issues with the electronics of the fridge. Occasionally, it is advised to take them off to avoid permanent damage, especially if they are moved across the surface roughly.

Magnet fishing is legal in Poland, although the lack of specific regulations can lead to uncertainties. In other countries, this is regulated by local law:
In the United States, magnet fishing is generally allowed, e.g., in South Carolina, where the law prohibits removing artifacts from state waters.
In Indiana, starting in 2025, a special permit is required for magnet fishing.
In the UK and the USA, there are restrictions on magnet fishing with regard to removing historical artifacts.
For certainty, consult with local authorities before starting this activity.

Magnets can be harmful to the fridge if they scratch its coating. Continuous shifting magnets potentially lead to scratches. However, standard use of magnets rarely is the cause of major damage.

To remove the anti-theft clips from clothing, you can use a clip magnet, such as the Magnes Ultra. Apply the magnet onto the clip and move it until the clip comes off.

Other methods include using scissors or a lighter, heating the plastic on the protruding part, then using pliers or scissors to cut the clip off, this may damage the clothing.

If the clip is attached with adhesive tape, try gently peeling it off, heating it with a hair dryer and using a cotton swab.

For more difficult security types, consult with customer support. More information can be found on the anti-theft clips page.

Magnets may not attract effectively if the surface is not suitable or if the there’s a barrier between the magnet and the surface. Check the details in our coating guide.

It is not recommended to place magnets on the fridge because they can ruin its finish. Furthermore, massive magnets can distort delicate metal surfaces of refrigerators.

Magnets can destroy the fridge if their constant shifting results in scratches to the finish of the fridge. Furthermore, extreme magnets can affect electronic control systems in some modern refrigerators.

If you plan to use neodymium magnets for treasure hunting, there are a few important things to keep in mind when choosing the right model.
First, neodymium magnets can be divided into two types: based on the design and method of securing the rope. As for securing, magnets mounted from the top are ideal for fishing from docks, bridges, or checking wells. They are also perfect for fishing from boats.
Models like DHIT Magnet GOLD come in five strengths, from 120 kg to 600 kg. On the other hand, magnets with double attachment, like DHIT Magnet GOLD, are the most versatile and allow for fishing both from above and the sides (the two handles can be screwed together at the sides for pair hunting).
As for popularity, the most commonly chosen models are: F200x2 GOLD, F300x2 GOLD, and F550x2. If you have doubts about choosing the right magnet, feel free to contact us. We are happy to advise and help you choose the model that best meets your expectations and goals.
More information about search magnets can be found on the which magnet to use for treasure hunting? or in the search magnets category.