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 shape and strength. Start by estimating what size of magnet you will need, e.g., whether you want to use a cylindrical magnet or a magnet with a hole to a screw. 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 - neodymium magnet under the bumper and two magnets MPL 40x20x5 / N38 - neodymium 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. Its atomic structure allows easy attraction with the magnetic field of the magnet.

Magnets usually do not attract aluminum because aluminum is not ferromagnetic materials. However, in certain situations, such as the presence of strong magnets, aluminum can exhibit weak reactions.

Magnets attract metal because some metals, such as nickel, have ferromagnetic characteristics. When a magnet approaches a iron surface, magnetic polarizations are created, which attract 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 magnetic 'S' pole.
Use a smartphone app: There are apps that help identify the poles of a magnet.
Use a teslameter: A teslameter measures the induction value 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:
With another 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 damaged or incomplete. 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 industrial applications.

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 benefit 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 pull out 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 bending the sheet, but this method is only effective if the sheet is thicker than 0.6 mm.

Another method is PDR (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 flexible steel bodies. This solution is fast and effective, and is ideal for car mechanics. For more information about magnets, visit our technology guide.

The magnet RM R6 GOLF - 13000 Gs / N52 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 safe solution recommended for stores, such as outlets. 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. Heat generated during soldering or welding can demagnetize 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 fume poisoning. Instead, use appropriate techniques that do not affect their magnetism.

Separating neodymium magnets requires precision and caution. The best way is to use tools such as wedges or special tools for magnets.
Start by sliding one magnet to the side, instead of dragging it directly. Secure the magnets to prevent them from uncontrolled attraction. More information can be found on the separation tools page.

For processing neodymium magnets, special diamond discs with intensive 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 regular magnet is not able to effectively substitute a specialized magnetic separator. Despite theoretical possibilities this is feasible, in reality using a regular magnet instead of a specialized magnetic separator will prove ineffective. Magnetic separators are complex devices that are adjusted to particular conditions and working conditions, often equipped with cleaning mechanisms and fastening components. In certain industries, where there are strictly defined requirements for cleaning products using a magnetic field, applying a regular magnet instead of a separator may not only be insufficient, but also cause penalties during auditing 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 sheets, which can be easily cut and decorated. Another popular material is epoxy resin, used for aesthetic finishes. Polymer clay allows for handmade magnets, while 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 electronics, medicine, and the automotive sector. They are used in electric motors, speakers, and medical equipment. For more examples, visit the magnet applications page.

Magnets stick to refrigerators because a significant number of refrigerators have metallic surfaces. Iron elements of refrigerators act as magnet-attracting surfaces, which allows magnets to hold.

If you need a strong magnet with a handle, we recommend 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, designed for professionals.
For more information, visit the what magnet for searching page.

Primarily, the most important users of magnets are enterprises producing measuring devices, electronics, electrical products, automotive businesses or producing different industrial machines. High-power magnets are also highly valued by the furniture sector, textile industry, particularly related to medical clothing, manufacturers of clamps for fashion accessories and the advertising industry.

Making your own fridge magnets is easy. You need a small neodymium 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 manufacturing of powerful magnets began in 1966. During that period, G. Hoffer and K. Strnat from the Air Force Materials Laboratory initiated research on magnets made from metals forming part of the so-called group of rare metals. At the beginning of the research, first metallic compositions planned to be used for creating strong magnetic elements were based on iron, cobalt, and light lanthanides, which include: praseodymium Pr, neodymium Nd, cerium Ce, yttrium Y, samarium Sm, and lanthanum La. These lanthanides demonstrate distinctive characteristics, such as strong magnetization potential, yet they suffered from a very low Curie temperature. Today’s high-strength magnets include iron as well as in addition to light lanthanides, which provides them with a high level of magnetocrystalline anisotropy, and furthermore, a few percent cobalt is added to compensate for the low Curie temperature. The debut high-power magnets were formulated at the beginning of the 1970s from powdered samarium together with other lanthanide compounds. The result was a previously unknown high-performance magnet SmCo₅. Production techniques was based on orienting alloy particles in finely ground material while subjected to a magnetic field in the sintering stage. The consolidation of preforms was conducted at temperatures above 1100°C with a final annealing stage at a temperature 250°C lower. The final step in the development of a high-strength magnet involved magnetizing the material in a high magnetic field of 2T. This process, the Curie temperature of the SmCo5 magnets was raised to 745°C.

During they were designed newer and newer strong magnets utilizing samarium, in the early 1980s they were discovered very intriguing magnetic characteristics of neodymium with the addition of boron and iron. The American company GM created in 1984 a compound with the chemical structure Nd₂Fe₁₄B, in the proportion of over 70% iron, 15% neodymium, 6% boron. The technology of producing high-power neodymium magnets is based on two methods. The Japanese Sumitomo plant, within the structures of Hitachi, similarly as the process of creating magnets based on samarium, used the method of sintering appropriately prepared powder, by which dense magnets were obtained.

In America powerful neodymium magnets were manufactured in General Motors with the method of very rapid chilling of molten isotropic powder. Why the combination of neodymium with iron and boron proved to be much more efficient? The use of neodymium was much more cost-effective than samarium compounds, and additionally neodymium is characterized by much better magnetic parameters. Yet its Curie temperature was significantly lower, for this reason it was decided to increase that temperature to 530°C. This level was achieved by means of adding a boron additive to the composition of the neodymium magnet. Additionally it is also possible alter the magnetic parameters of the magnet by incorporating auxiliary compounds, such as gallium Ga, copper Cu, niobium Nb and aluminum Al.

Magnets based on neodymium are at present the strongest magnets that have been created until now. At the end of the 20th century, at the Trinity College Dublin, Michael Coey developed a completely new magnetic material with the chemical structure Sm₂Fe₁₇N₂. The process of creating this material was carried out through synthesis of fine samarium and iron powder, which were compacted in a strong magnetic field along with the addition of nitrogen, achieving a Curie temperature range of 470°C as well as magnetization of around 0.9T. These are not results comparable to neodymium magnet, but the newly invented composition of samarium significantly exceeded the first produced magnets. The end of the 20th century brought next ideas in the field of high-power magnets and ways of their manufacturing.
Nano-crystalline magnetic material was was developed, constructed from tiny grains with a diameter smaller than 100 nm. The grains that were discovered nano-crystals, in unlike monocrystals are separated from each other space with much greater surface magnetic power and disordered construction. Thanks to the use of, while manufacturing alloy of elements from the group of rare earth metals along with an iron additive, they are characterized by a high level of magnetic remanence. Very good magnetic characteristics also come from another aspect, that is the coupling of magnetic moments iron and neodymium. This allows for very good magnetization the presented magnets.

Currently neodymium magnets are made mainly in Asia. The primary manufacturer and supplier of these goods has become China, because of control over most rare earth element deposits in the world. For industrial production neodymium magnets two types of compounds are applied: Sm₂Fe₁₇N₂ and Nd₂Fe₁₄B. These are neodymium-based magnets as well as nano-crystalline magnets, featuring not only the highest level of magnetization, but high remanence. Application neodymium magnets is extremely versatile. The main types of customers are companies in the manufacturing industry, creating electrical, electronic devices, especially automotive companies, applying highly efficient electric and hybrid engines. In the manufacturing of engines of this type neodymium magnets are used from a mixture with elements minimizing performance losses of magnets at high temperatures such as dysprosium (Dy) and Terbium (Tb). By using these compounds, magnetic coercivity has been greatly improved as well as overall performance magnets used in electrical devices with higher nominal power. In the USA for decades scientific research has been conducted by the specialized REACT Institute, which is responsible for developing modern alloys. In 2011, nearly 32 million dollars were allocated by ARPA-E nearly 32 million dollars for developing advanced projects under the program on rare-earth substitutes, with the goal of creating substitutes for rare-earth metals as a replacement for natural reserves of elements, which are controlled by the Chinese government.

The manufacturing neodymium-based magnets is based on on two methods. Japanese companies use a method of using sintering powders of ferromagnetic materials, while in the United States a technique based on fast cooling. Depending needs, neodymium-based magnets can be made using other alloys, such as aluminum, gallium or copper. Thanks to such combinations it is possible to significantly control magnetic properties of the magnet, its resistance, and also working in high-temperature ranges. It is possible to make the magnet resistant to harmful atmospheric conditions, such as water, which can cause rusting of iron. However systematic refinement of powder metallurgy processes has contributed to obtaining various kinds of material alloys, which significantly affected the increase Curie temperature. Manufactured in a modern way neodymium magnet, reaches a magnetization level exceeding 1.6T, meaning much greater such as the Earth's magnetic field.

A neodymium magnet is the strongest permanent magnet made by humans. Its extraordinarily high magnetic strength comes from the combination of iron, neodymium, and boron to form a tetragonal crystal structure of Nd₂Fe₁₄B. This alloy composition provides unprecedented magnetic properties, including exceptionally high magnetic anisotropy.
Neodymium magnets can be made as sinters, but they can also be made as so-called bonded magnets, using plastics or resins as a binder.

Neodymium magnets are made from an alloy of 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 sheets 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 gets pressed by a pyrometallurgical method under high pressure, which enables achieving high density and uniformity. During the forming process, the material is magnetized using a magnetic field, which sets 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 coating with protective layers). Finally, the resulting product is magnetized in a magnetizer, becoming a magnet.

Rare earth magnets are magnets that contain at least in part metals known as earth metals. 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 strongest magnet (e.g. N52 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.

Markings used for neodymium magnets consist of numbers and letters, 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 figures like 35, 38, 42, 45, 48, 50, 52 represent the level of magnetic energy of the magnet measured in MGsOe. For example, the symbol N52SH means that this is a neodymium magnet with a magnetization of 52 Mega Gauss Oersteds - (MGsOe) and extraordinary resistance to demagnetization (SH symbolizes 'super high').

Neodymium magnets are typically available in simple shapes such as: rectangular prism, 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 an alloy of iron, boron, and neodymium are sintered 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 machines 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: meters, alarm systems, monitors, drones. The main industries where neodymium magnets are used include: toy.

The most important criterion for selecting neodymium magnets will be their purpose. 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 shows strong interaction 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, especially 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 an external magnetic field, which aligns the material along the field lines. These magnets are magnetized in one direction, making them stronger. In contrast, isotropic magnets do not require an external field, and their magnetization occurs only at the end of the process. Isotropic magnets are less magnetic, 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 (Br), coercivity, and maximum energy product (BHmax).

Remanence (Br) is the maximum magnetic induction that the magnet can retain after the magnetic field is removed. The Br value for neodymium magnets ranges 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. The maximum energy product for neodymium magnets is between 200 and 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 heavier 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 heavier than other magnetic materials, making them ideal for applications requiring high magnetic power.

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 exceptional magnetism and relatively low mass compared to traditional magnets. As a result, they have found widespread use in many industries, including electronics, automotive, 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, and 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 so-called 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 poles. Modern magnets can be magnetized multipolar, meaning they can have many pairs of poles. The technical designation of such magnets is 4-pole, which refers to one, two, or three magnetic poles.

Isotropic magnets, formed without a magnetic field, can have multiple poles. 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 advanced device consisting of multiple magnets that work in magnetic loops. These circuits enhance 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 will not have enough power to replace the separator. A magnetic separator is designed for specific requirements 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 magnetic impurities.

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 heavily attracted to neodymium magnets. Steel metals 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.

Markings 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, aluminum, or copper. 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 wide magnetic hysteresis loop that, once magnetized, maintains 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 the phenomenon of demagnetization. Such magnets are used in motors, where resistance to magnetic fields is crucial. More information about magnets can be found on the technology page.

A magnet attracts iron because iron is one of the few ferromagnetic metals 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 remaining domains to align in one direction, making iron attracted to the magnet.

Not true, both poles of a magnet have the same strength.
More about poles can be found on the enes magnet page.

Magnets are commonly used in bodywork repairs. This method relies on combining a large magnet and a ball, allowing the dents to be removed without painting. For more details 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 ensures their longevity.

The sliding force of a magnet is the force required to move the magnet along a surface. It depends on friction and the magnet's strength. Check the calculator.

Magnets attract each other when their opposite poles are directed towards each other. This is the key law of magnetism, causing the magnetic force to act.

Neodymium magnets operate in the range of temperatures from -130°C to up to 230°C, depending on their type.

To boost its magnetic power, you should avoid high temperatures, apply additional magnetic fields, and use appropriate magnetic setups.

Neodymium magnets can retain their magnetic strength for many years, as long as they are stored in proper conditions.

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.

The PKWiU code for magnets is 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 line is concentrated the thickness of the magnet, rather than through the length or width. Such magnets are commonly used in industry, where strength in a particular direction is required.

Blocking the effect of a magnetic field requires the use of materials like mu-metal, which shield the magnetic forces. There is no material that completely stops a magnetic field, but some materials can weaken its effect. More information can be found on the materials for blocking fields page.

Neodymium magnets are protected to prevent oxidation, especially in humid conditions. The most popular coatings are nickel-copper and chrome, which extend the lifespan of the magnets. Learn more about coatings on the magnet coatings page.

Magnets repel each other when their identical poles are facing towards each other. 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 bounce off. This is a fundamental principle of electromagnetism.

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 identified using a compass or Hall sensors. In a compass, the magnetic needle shows the north pole and south pole. 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 protected to increase their durability. The most commonly used coatings are three-layer, which increase resistance to moisture. Learn more in the technology section.

Neodymium magnets are not completely resistant by moisture. Long-term exposure with moist environments can lead to corrosion, unless 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 ensures resistance to corrosion. Plastic and gold coatings are also used, though less frequently.

Neodymium magnets are incredibly powerful, far stronger than other types of magnets. Their strength creates potential risks if we don’t exercise caution. In larger sizes, they can cause serious injuries, if body parts get trapped between them. Always use protective equipment to avoid such situations. Watch this video to see examples: YouTube.

Magnets can disrupt the operation of mobile phones, especially if they are strong. They can affect the operation of compasses, Hall sensors, and even touchscreens.

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

Mechanical work with magnets can be risky. The shavings and small particles stick to machines, which can cause malfunctions. The hardness and brittleness of the material complicates precise processing.

Most foreign objects, like magnets, are swallowed without complications and pass through the digestive tract. The vast majority of cases result in natural expulsion within a short time. If a child swallows only one magnet or coin, giving them plenty of water and bread will help with the natural expulsion. When a child swallows two magnets, a problem may arise as they can stick together in the digestive tract. In such a case, a doctor consultation is required 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 Masato Sagawa. He was the first to undertake studies related to the magnetic features of rare earth elements, conducting his work at Fujitsu Laboratories for about 10 years. Later, he joined Sumimoto Special Metals, and it is believed 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, there has been rapid development in this area of science.

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 risk of scratching the surface of the fridge, especially when they are regularly moved. Additionally, very strong magnets can affect the electronics in some appliances.

Magnets should be removed from the fridge if they cause damaging its exterior. Furthermore, very strong magnets potentially cause issues with the electronic systems of the fridge. Occasionally, it is advised to remove them to counter scratches, particularly if they are moved across the surface carelessly.

Magnet fishing is allowed in Poland, although the lack of specific regulations can lead to uncertainties. In other countries, the situation depends on local regulations:
In the United States, magnet fishing is usually permitted with exceptions, e.g., in South Carolina, where the law prohibits removing artifacts from state waters.
In Indiana, starting in 2025, a permit is required for magnet fishing.
In the UK and the USA, there are regulations limiting 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 finish. Constant moving magnets potentially result in scuff marks. However, normal use of magnets seldom results in serious damage.

To remove the anti-theft clips from clothing, you can use a clip magnet, such as the Magnes Ultra. Place the magnet onto the clip and gently move it until the mechanism disconnects.

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 scraping the tape, heating it with a hair dryer and using a soft tool.

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 scratch its finish. Furthermore, heavy magnets can deform delicate metal surfaces of refrigerators.

Magnets can destroy the fridge if their constant shifting results in scuff marks to the finish of the fridge. Additionally, extreme magnets can interfere with mechanical 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.