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 size of magnet you will need, e.g., whether you want to use a flat 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 attraction power, which is crucial for selecting a magnet for your project. For more information on attraction power, refer to the product card.

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 strongly magnetic material. Its atomic structure allows strong bonding with the magnetic field of the magnet.

Magnets usually do not attract aluminum because aluminum is not part of ferromagnetic materials. However, in certain situations, such as the presence of powerful magnets, aluminum can exhibit minor effects.

Magnets attract metal because some metals, such as steel, have magnetically attractive properties. When a magnet approaches a iron surface, magnetic forces are created, which bond 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 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 move the magnets, matching their poles.
With a flow of electricity: Connect the magnet to electrical wires, which causes the current to induce a magnetic field.
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 ferromagnetic metals. 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 cracks or scratches. 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 stronger attraction, 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 the PDR technique (Paintless Dent Repair), which involves straightening the sheet using a special kit (cost approx. 500 PLN). This time-consuming 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 professional, and is perfect for automotive workshops. 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 intuitive, and its installation on a counter is very easy. This is a modern and safe solution 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 removal of 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 techniques for handling magnets that do not affect their magnetism.

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

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

Connecting several magnets can enhance their performance, but only under specific conditions. Increasing the power has its limitations.

No, a single magnet is not able to effectively substitute a advanced magnetic separator. Despite theoretical possibilities this is possible, in reality using a regular magnet instead of a complex magnetic separator will prove inefficient. Magnetic separators are complex devices that are customized to particular conditions and working conditions, often equipped with cleaning mechanisms 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 may not only be insufficient, but also cause issues 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 foil, which can be easily cut and decorated. Another popular material is epoxy resin, used for aesthetic finishes. Fimo allows for custom magnets, while paper is used for creating photo magnets. Additionally, industrial adhesives 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 many fields, such as audio device production, drive 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 most of refrigerators have steel surfaces. Metallic surfaces of refrigerators act as magnetic conductors, which allows magnets to hold.

If you need a powerful magnet for work, 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, designed for professionals.
For more information, visit the what magnet for searching page.

Primarily, the primary users of magnets are businesses offering electrical, electronic, measuring equipment, automotive companies as well as supplying different industrial machinery. Magnetic capabilities are also highly valued by the furniture industry, textile industry, especially related to medical apparel, manufacturers of closures for wallets and handbags 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 first known tests and research on alloys that could serve in the manufacturing of powerful magnets took place over 50 years ago. At that time, scientists K. Strnat and G. Hoffer from the Air Force Materials Laboratory decided to launch a wide range of studies on magnets composed of metals classified as the so-called group of rare metals. Initially, the tested metallic compositions considered for producing high-strength magnets were composed of iron, cobalt, and light lanthanides, which include: neodymium Nd, cerium Ce, praseodymium Pr, yttrium Y, samarium Sm, and lanthanum La. The lanthanides mentioned above exhibit particular capabilities, such as the ability to be strongly magnetized, but one drawback was their low Curie temperature. Today’s high-strength magnets contain iron as well as but also light lanthanides, which provides them with a high level of magnetocrystalline anisotropy, and furthermore, cobalt is introduced to increase the too-low Curie temperature. The debut high-power magnets were developed at the beginning of the 1970s from powdered samarium together with a few additional lanthanide compounds. Thus, the first powerful magnet type SmCo₅. Production techniques was based on orienting of the alloy crystals within powdered material under the influence of a magnetic field during sintering. The sintering process of preforms was carried out at temperatures above 1100°C with a final annealing stage at a temperature 250°C lower. The concluding stage of manufacturing of this powerful magnet was exposing the material to magnetization in a high magnetic field of 2T. Thanks to this approach, the Curie temperature of the newly developed magnets was raised to 745°C.

During they were designed the next high-power magnets based on samarium, in 1983 were discovered previously unknown magnetic properties of the neodymium compound with the addition of boron and iron. General Motors a year after the discovery created new compound with the chemical structure Nd₂Fe₁₄B, composed of 15% neodymium, 6% boron and over 70% iron. The technology for creating powerful neodymium magnets utilizes two methods. The Sumitomo plant from Japan, within the structures of Hitachi, similarly as in the case of powerful magnets produced from samarium, used the method of sintering powdered materials, resulting in the production of dense magnets.

In the United States powerful neodymium magnets were produced in the plants of GM by means of a method of very rapid temperature reduction of molten isotropic powder. Why is it that using boron, neodymium and iron yielded much better results? The use of neodymium was much more cost-effective than samarium, and additionally neodymium is characterized by much better magnetic parameters. Yet the Curie temperature of this element was not at an appropriate level, for this reason it was decided to increase that temperature to 530°C. This level was reached through the addition of a boron to the composition of the neodymium magnet. Additionally it is also possible alter the magnetic characteristics of the magnet by incorporating additional elements, such as gallium Ga, copper Cu, niobium Nb plus aluminium Al.

Neodymium magnets are currently the most powerful magnets that have been created until now. At the end of the 20th century, at Trinity College in Dublin, Michael Coey developed a previously unknown magnetic compound with the chemical structure Sm₂Fe₁₇N₂. The production process used synthesis of fine samarium and iron powder, which during compaction in a strong magnetic field together with a nitrogen additive, achieving a Curie temperature of up to 470°C and a magnetization level 0.9T. These are not results comparable to neodymium magnets, but the newly created material greatly exceeded the first produced magnets. The end of the 20th century brought next discoveries in the domain of high-power magnets and ways of their manufacturing.
Nano-crystalline magnetic material was was developed, made of tiny grains with a diameter smaller than 100 nm. The newly discovered grains nano-crystals, in unlike monocrystalline structures are separated from each other space with higher surface magnetic power and a less ordered internal structure. By applying, during sintering elements from the group of rare earth metals together with the addition of iron, they feature high remanence value. Very good magnetic parameters also come from one more thing, that is the coupling of magnetic moments neodymium with iron. This enables excellent magnetization neodymium magnets.

Currently neodymium magnets are produced primarily on the Asian continent. The largest manufacturer and distributor of these goods are China, due to holding most rare earth element deposits in the world. For industrial production high-power magnets two types of compounds are used: Sm₂Fe₁₇N₂ and Nd₂Fe₁₄B. These are neodymium magnets as well as nano-crystalline magnets, featuring not only a high level of magnetization, but also high magnetic remanence. The use neodymium magnets is very wide. The main groups of customers are businesses from the production industry, creating electrical and electronic equipment, especially companies in the automotive industry, using efficient hybrid and electric motors. For the production of engines of this type neodymium magnets are used from a mixture with compounds reducing efficiency losses of magnets under high temperature conditions for example like dysprosium (Dy) and Terbium (Tb). Thanks to the use of these compounds, magnetic coercivity has been greatly enhanced and also total efficiency magnets applied in electronic devices with greater nominal power. In the United States of America for many years specialized research has been carried out by the Rare Earth Alternatives in Critical Technologies (REACT) Institute, which is responsible for developing alternative materials. A few years ago, ARPA-E allocated 31.6 million dollars for financing advanced projects under the Rare-Earth Substitute program, which aims to develop alternatives to metals as an alternative for naturally occurring elements, which are under China's control.

The production of neodymium magnets is based on on two technologies. Japanese companies use a method of using sintering powders of ferromagnetic materials, while in the United States a method based on very fast cooling. Depending on expectations, neodymium magnets are made using other alloys, such as gallium, copper, or aluminum. Thanks to such combinations it is possible to control magnetic parameters itself, its strength level, and also working in high-temperature ranges. It is possible to make the magnet resistant to harsh atmospheric conditions, such as water, causing corrosive changes. However regular improvement of powder metallurgy has contributed to obtaining various alloys, which significantly affected the increase of the so-called. Created using a modern manufacturing method a neodymium magnet, can achieve magnetization exceeding 1.6Tesla, meaning much greater for example Earth's magnetic field.

A neodymium magnet is one of the strongest permanent magnets available. Its incredibly strong magnet comes from the use of a mixture of iron, neodymium, and boron in the right proportions to form a tetragonal crystal structure of Nd₂Fe₁₄B. Such a combination of elements provides unprecedented magnetic properties, including exceptionally high magnetic anisotropy.
Neodymium magnets can be made 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 made from an alloy of Fe, boron, neodymium, and other additives. The production process starts with selecting the correct amounts of each element, which are melted and then cast. The resulting sheets are crushed by a hydrogen method and afterward 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 allows for achieving high density and uniformity. During the forming process, the material is 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 coating with protective layers). Finally, the finished product gets 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.

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 due to high temperature or influence of opposite magnetic fields, and numbers like 35, 38, 42, 45, 48, 50, 52 indicate the magnetic energy density of the magnet in units of MGsOe. For example, marking N52SH indicates that this is a neodymium magnet with a magnetic energy density 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: rectangular prism, as well as a ring, meaning neodymium cylinders with a hole. These are commonly referred to as cylindrical 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 composite iron, boron, and neodymium. In reality, the composition of a neodymium magnet contains only about thirty percent Nd₂Fe₁₄B, and thanks to its atomic structure, these magnets are so potent.

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: meters, doorbells and locks, televisions, wind turbines. The main industries where neodymium magnets are used include: medical.

The most important criterion for selecting neodymium 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 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, 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 are formed without 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. There are three main parameters that affect their properties: remanence (Br), 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. For neodymium magnets, it typically 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 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, 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 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 magnetic poles. Modern magnets can be magnetized multipolar, meaning they can have many pairs of poles. The technical designation of such magnets is 2-pole, which refers to one, two, or three pairs of 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 determined 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 loss of magnetism. 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 without additional components are less effective. 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. These materials are strongly 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, also known as dental steel.

Symbols of neodymium magnets include letters and numbers that define the magnetic properties of the magnet. Letters such as M – "medium", H – "high", SH – "super high", UH – "ultra high", EH – "extra high" indicate the magnet's resistance to demagnetization. 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 high resistance to demagnetization. More information about magnets and their markings can be found in our technology guide.

Neodymium magnets do not attract pure gold, aluminum, or copper. These metals act oppositely in the presence of an alternating magnetic field due to eddy currents. However, neodymium magnets strongly attract elements like iron, nickel, cobalt. 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 higher the coercivity, the greater the resistance to demagnetization. Such magnets are used in electrical devices, 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 a ferromagnetic metal that possesses its own magnetic field. Ferromagnetic materials like iron, other ferromagnetic metals, have magnetic domains that direct their fields in one direction. When a magnet approaches iron, the magnet's field directs itself towards 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.

No, each pole 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 requires a large metal ball and a neodymium magnet, allowing the metal sheet to bend without painting. For more details on the technology page.

Neodymium magnets are durable, losing less than 1% per decade, as long as they are subjected to unfavorable conditions. Storing them in a dry environment increases their lifespan.

The sliding force of a magnet is the force required to move the magnet along a surface. It depends on the surface material and its magnetic force. 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 attraction of opposite-polarized poles.

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

To increase the strength of the magnet, you should avoid high temperatures, use an external magnetic field, and use appropriate magnetic setups.

Neodymium magnets can last for many years, provided they are used correctly.

Neodymium magnets lose power very slowly. Typical power loss is around 1% per decade, 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, covering various 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 thickest layer of the magnet, rather than through the length or width. This type of magnet are popular in industry, where strength in a particular direction is necessary.

Blocking the magnetic field requires the use of materials like mu-metal, which absorb the magnetic lines. 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, when exposed to moisture. The most popular coatings are nickel and chrome, 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 nature of magnetism. When the north pole of one magnet is pointing towards the north pole of another (or the south pole towards the south pole), these magnets do not attract. This is a key law 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 determined using a compass or Hall sensors. In a compass, the magnetic needle shows the N 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 nickel-copper, which ensure protection. Learn more in the technology section.

Neodymium magnets are not completely resistant by moisture. Long-term exposure with water can lead to corrosion, unless the magnet has the proper protective layer. More on protecting magnets from moisture can be found in the moisture protection section.

Neodymium magnets are primarily composed of neodymium, iron, and boron. If they are not protected, they may corrode, especially in moist environments. For protection, most neodymium magnets receive a special protective layer, most commonly nickel, which ensures resistance to corrosion. 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 we don’t exercise caution. In larger sizes, they can cause serious injuries, if body parts get trapped between them. Always take precautions to avoid such situations. Watch this video to see examples: YouTube.

Magnets can damage the operation of smartphones, especially in the case of strong neodymium magnets. They interfere with compasses, magnetic sensors, and even touchscreens.

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

Processing neodymium magnets can be risky. The shavings and small particles stick to machines, which can cause malfunctions. 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 water and bread will help with the natural expulsion. In case of swallowing two magnets, a problem may arise as they can stick together 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 running to doctors. More information can be found on the dangerous magnets page.

The neodymium magnet was discovered 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, he joined 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 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 carelessly moved. Additionally, very strong magnets can affect the electronics in some fridges.

Magnets should be removed from the fridge if they cause damaging its exterior. Additionally, very strong magnets can cause issues with the electronics of the fridge. Occasionally, it is advised to remove them to prevent long-term damage, particularly if they are moved across the door roughly.

Magnet fishing is allowed in Poland, although the lack of specific regulations may cause uncertainties. In other countries, the situation depends on local regulations:
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 permit is required for magnet fishing.
In the UK and the USA, there are regulations limiting magnet fishing with regard to removing historical artifacts.
To avoid issues, consult with local authorities before starting this activity.

Magnets can be harmful to the fridge if they scratch its coating. Continuous shifting magnets may result in surface damage. However, typical application of magnets rarely causes significant damage.

To take off 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 separate the plastic, be cautious to avoid damage.

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 store assistance. More information can be found on the anti-theft clips page.

Magnets may not work properly if the metal is not ferromagnetic or if the magnet’s coating is damaged. Check the details in our coating guide.

It is not recommended to place magnets on the fridge because they can ruin its surface. Additionally, massive magnets can deform thin metal surfaces of refrigerators.

Magnets can destroy the fridge if their movement causes scuff marks to the finish of the fridge. Furthermore, very strong magnets can interfere with electronic 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.