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Ferrite Magnets

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20+ years of experience in the magnet industry, all our sales have 12+ years expertise and knowledge in various types of permanent magnets.

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Most of permanent magnets are customized according to drawing and requests.Be flexible in accommodating customer needs, whether it involves order adjustments, additional information, or other special requests.

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Besides Neodymium magnet, we also provide Alnico magnet, Samarium Cobalt (SmCo) magnet, Ferrite(ceramic) magnet, Flexible magnet(Rubber magnet) and Magnetic Products.

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Ferrite Magnets

Ferrite magnets, also known as ceramic magnets, are magnets made from iron oxide chemically combined with a metallic element. They are electrically nonconductive but ferromagnetic, meaning they can be magnetized or attracted to another magnet. Shows temperature dependence of demagnetization characteristics of ferrite magnets. It should be noted that there are soft ferrites, the coercive intensity of which being almost zero.

What Are the Types of Ferrite Magnet

Typically, the ferrite magnet can be divided into three types: permanent ferrite magnet, soft ferrite magnet, and microwave ferrite magnet.

Permanent ferrite magnet
The small black magnet we usually see is usually made from permanent ferrite magnet. Its constituent raw materials are mainly iron oxide, barium carbonate, or strontium carbonate. After being magnetized, the strength of its residual magnetic field is high, and it can maintain the residual magnetic field for a long time. Permanent ferrite magnets have a wide application in our daily lives.

Soft ferrite magnet
Soft ferrite magnet is prepared by sintering ferric oxide and one or several other metal oxides (for example, nickel oxide, zinc oxide, manganese oxide, magnesium oxide, barium oxide, strontium oxide, etc.). The reason why it is called soft ferrite magnet is that when the magnetizing magnetic field disappears, the residual magnetic field is little or almost no. Soft ferrite magnet is usually used as a choke coil or the core of an intermediate frequency transformer. This is completely different from permanent ferrite magnet.

Microwave ferrite magnet
Microwave ferrite magnet refers to ferrite magnet materials with gyromagnetic properties. The gyromagnetic of magnetic materials means that under the action of two mutually perpendicular DC magnetic fields and electromagnetic wave magnetic fields, during the propagation of plane-polarized electromagnetic waves in the material in a certain direction, the polarization plane will continuously rotate around the propagation direction. Microwave ferrite magnet has been widely used in the field of microwave communication.

Magnetic Properties of Ferrite Magnets

Ferrite magnets, also known as ceramic magnets, provide the lowest magnetic field strength of all permanent magnetic materials with a maximum energy product range of 0.8-5.3 MGOe. However, they are by far the most cost effective to manufacture in large volumes, which is a reason why they are commonly used for commercial, high volume production runs where space, and therefore the size of the magnet is not a limiting factor.
Ferrite magnets can generally be manufactured in individual blocks as large as 152mm x 101mm x 25mm (6in x 4in x 1in). There are two types of ferrite magnets manufactured today, strontium ferrite (SrO.6Fe203) and barium ferrite (BaO.6Fe203). Strontium ferrite is the most popular as they provide the best magnetic properties.
Ferrite magnets are non-conductive and will not corrode as they are essentially already made from rust (iron oxide) and therefore cannot corrode further. They also maintain their performance in high temperatures and can be used in temperatures up to 250 degrees Celsius before any loss in performance occurs.
Ferrite magnets are susceptible to demagnetisation by stronger magnetic fields, which is why you will not find rare earth and ferrite magnets working together in the same application. Uniquely, their resistance to demagnetisation actually improves as the working temperature rises to make them particularly useful for electric motors.
Ferrite magnets are typically produced in standard shapes such as discs, arcs, blocks and rings rather than some of the more intricate shapes that you will find rare earth magnets produced in.

The Comparison Between Neodymium and Ferrite Magnets

Strength
Due to their higher strength and smaller size, neodymium disc magnets are used in many modern electronic devices, including headphones, speakers, and hard drives. They are 2-7 times stronger than a ferrite magnet, enabling them to lift more than any other type of magnet is a similar size.
Ferrite magnets, on the other hand, are used in many more traditional applications, such as fridge magnets, motor magnets, and holding magnets for doors and cabinets. However, the choice of magnet depends on the specific application requirements.

Temperature Resistance
Ferrite magnets offer advantages over neodymium magnets when it comes to maintaining magnetization at higher temperatures due to their higher Curie temperature.
While some neodymium magnets can be treated in temperatures above 200 °C, they are generally more expensive than lower temperature grades.
On the other hand, ferrite magnets can withstand temperatures up to 300 degrees Celsius, and their coercivity increases as the temperature rises. This means that as the temperature increases, ferrite magnets show greater resistance to demagnetization.
It's worth noting that ferrite magnets can have magnetic field loss at higher temperatures, with a decrease of about 0.20% per degree Celsius.

Machining
Neodymium magnets are easier to machine (such as grinding, cutting, EDM, or abrasive water-jet) compared to ferrite magnets, especially when it comes to small, precision parts. When making small parts, the cost is primarily determined by the machining process rather than the material itself.
While NdFeB (Neodymium Iron Boron) is relatively brittle compared to other metals, ferrite magnets are even more brittle and pose greater challenges for machining. Therefore, there is a certain size or complexity threshold where it becomes more expensive to manufacture a ferrite part compared to an equivalent neodymium part due to the difficulties in mechanical processing.
It's worth noting that as the size of the parts decreases, the cost per kilogram may increase, but the unit cost generally decreases. This is because as the parts become smaller, the total cost is influenced more by the surface area. As parts shrink, the ratio of surface area to unit volume increases.

Versatility
Sure, neodymium magnets tend to cost more than ferrite magnets.
Their exceptional strength and durability mean that fewer neodymium magnets are required for most applications.
Whether you choose a neo-disc magnet or a neo-cylinder magnet, these magnets are used for most industrial, commercial, and technological applications where high magnetic forces are required, neodymium is the superior choice.

Corrosion Resistance
Neodymium magnets are often criticized for their poor corrosion resistance, but they typically come with a corrosion-resistant coating, unless specifically requested without it.
The default coating is nickel-copper-nickel (NiCuNi), which provides excellent corrosion resistance and a clean appearance for most applications, without needing additional coatings.
This standard coating is cost-effective and adds only a minimal expense. However, for applications that require higher corrosion resistance, other coatings are available at a slightly higher cost. This means that NdFeB magnets can be used in various corrosive environments without issues.
In contrast, ferrite magnets generally do not require any coatings at all. This distinction influences several design choices in favor of ferrite magnets.

How to Cut Ferrite Magnets Without Losing the Magnetism

Use work gloves to avoid getting in contact with the splinters, which are often dangerous and very painful when in contact with the skin.
You must mark the line of cut on the magnet so as not to deviate from the desired cut.
Use a protective mask for the nose and mouth, because the cutting of magnets produces dust that remains in the air.
Fasten the magnet with a screw, to prevent it from moving and favor the conservation of its magnetic properties. Excessive vibrations give rise to a loss of magnetic electrons from the magnet, diminishing or losing its magnetic properties. By controlling vibration you avoid loss of magnetization.

How Ferrite Magnets Are Made

There are two chemical varieties of ferrite magnet. Strontium ferrite is known by two chemical symbols:- SrFe12O19 or SrO.6Fe2O3. Barium ferrite is also known by two chemical symbols BaFe12O19 or BaO.6Fe2O3.
Ferrite magnets (Ceramic Magnets) are produced by calcining (at between 1000 to 1350 degrees C) a mixture of iron oxide (Fe2O3) and strontium carbonate (SrCO3) or barium carbonate (BaCO3) to form a metallic oxide. In some grades, other chemicals such as cobalt (Co) and lanthanum (La) are added to improve the magnetic performance. This metallic oxide is then milled to a small particle size (less than a millimetre in size; usually a few microns). Then the process has two main production options depending on the type of magnet required.
Simplified process:
SrCO3 + Fe2O3 > SrOFe2O3 + CO2
SrOFe2O3 + 5Fe2O3 > SrO.6(Fe2O3)
BaCO3 + Fe2O3 > BaOFe2O3 + CO2
BaOFe2O3 + 5Fe2O3 > BaO.6(Fe2O3)
The first is to press the dry fine powder in a die which results in an isotropic magnet (e.g. ferrite C1 grade) which has better dimensional tolerances (it will often not require any further machining to final size). The hexagonal crystal structure is random allowing the magnet to be magnetised in any direction afterwards.
The second method involves mixing the fine powder with water to produce a slurry which is then compacted in a die in the presence of an externally applied magnetic field. The external magnetic field helps the hexagonal crystal structure align more perfectly with the magnetic field, improving the magnetic performance (e.g. ferrite C8) – the water in the slurry acts like a lubricant. This results in an anisotropic ferrite magnet with stronger magnetic properties but it will possibly require additional machining stages to give the final dimensions. Sometimes a wet extrusion is performed instead of wet die pressing (to make arcs for example) – the magnet is then cut to required after sintering (sintering is the next stage).
The first method may also have an external magnetic field applied to produce anisotropic magnets as well (e.g. ferrite C5).
The compacted magnets ("green" magnets) are then sintered (at a temperature between 1100-1300 degrees C) to fuse the particles together. If any final machining is performed, it is carried out using diamond cutting tools (wire spark erosion will not work because ferrite is electrically insulating). Quite often the magnetic pole faces are machined/ground to the required finish and the other surfaces are left in an as-sintered state. The magnet is then washed and dried before being magnetised to saturation, inspected and packed for shipping to the customer.
Ferrite magnets made by wet pressing have better magnetic properties but are more likely to have bigger dimensional tolerances. Dry anisotropic hard ferrite magnet has lower magnetic properties than wet anisotropic hard ferrite.

Cross Industry Applications of Ferrite Magnets

Ferrite magnets find diverse applications in various industries, each relying on these properties for specific needs.

Automotive Industry

Ferrite magnets find applications in electric power steering systems, automotive sensors, and under-the-hood components due to their cost-effectiveness and corrosion resistance.

Consumer Electronics

They are used in various electronic devices, including speakers, magnetic latches, and sensors.

Electric Motors

Ferrite magnets are employed in electric motor components, such as rotor assemblies in household appliances and power tools.

Magnetic Separators

Their corrosion resistance and low cost make ferrite magnets suitable for use for magnetic separators to remove ferrous contaminants from liquids and powders.

Refrigeration and HVAC

They are used in fan motors, pump motors, and compressors in refrigeration and HVAC systems.

Education and Hobbies

Ferrite magnets are popular in educational kits, craft projects, and refrigerator magnets.

Advantages of Ferrite Magnets

Cost-effectiveness: Ferrite magnets are the most affordable of all permanent magnet types given the availability of raw materials. They also utilize a relatively straightforward manufacturing process.

Ease of manufacture: The process of making ferrite magnets is relatively straightforward and efficient with no complexities.

Electrical insulation: The insulating quality of ferrite magnets means they do not cause interference when used in electrical circuits.

Good corrosion resistance: Ferrite magnets display decent resistance to corrosion when compared to other magnet materials with iron content. As such, they can be used where moisture and corrosive chemicals are an issue.

High coercivity: The coercivity of ferrite magnets is such that they cannot be easily demagnetized. This is especially useful where stability and durability are desirable.

Non-hazardous: The constitution of ferrite magnets is free of hazardous materials making them environmentally safe in terms of handling and disposal.

Temperature stability: These magnets have been established to work well in a wide temperature range without losing magnetic strength. They can therefore be used in high-temperature applications.

Wide application range: Given the availability and low cost of ferrite magnets, they are preferred for a wide range of applications.

Our Factory

Everbeen Magnet is located in Xiamen, a coastal city on the southeast coast of China. It has ocean shipping and air shipment ports leading to all over the world, with a developed economy and convenient logistics.
Everbeen Magnet specializes in the development and processing of various permanent magnet materials such as NdFeB,Ferrite magnets and accessories, electronic components, and magnetic application devices. We have been deeply involved in the field of permanent magnet materials for more than 20 years. We can Adopt sophisticated process management and high-quality services to meet customer needs, accurately provide cost-effective products.

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FAQ

Q: Are ferrite magnets fragile?

A: There is a risk of chipping or breaking the magnets because all magnets are inherently brittle. It is advised to not put magnets in conditions of mechanical stress e.g. in load bearing situations. Like all magnets, because ferrite is brittle it should not be exposed to high compressive forces.

Q: How can you tell if a magnet is neodymium?

A: The proceeding 'N' refers to neodymium and some magnet grades also feature suffixed letters indicating the coercivity. Common grades include neodymium magnets N52, N50, N48, N45, N42 and N35.

Q: What are the differences between neodymium magnets and ferrite magnets?

A: Neodymium A neodymium magnet is a magnet in short. What is different from the regular magnets we see every day is that it is called the "King of Magnets" because of its excellent magnetic function. Nd-Fe-B contains a large number of rare earth elements Nd, Fe, and B, which are hard and brittle. Because the surface is easily eroded by oxidation, the NdFeB magnet must be coated. Surface chemical passivation is one of the best treatment methods. As a rare earth permanent magnet material, neodymium magnet has a very high magnetic energy product and coercive force. At the same time, the advantages of high energy density make Nd-Fe-B permanent magnet material used in modern industry and electronic technology trivially, which makes it possible to miniaturize, lightweight and thin instruments, electroacoustic motors, magnetic separation magnetization, and other equipment. The advantage of the neodymium magnet is its high-cost performance and excellent mechanical properties. The disadvantage of Nd-Fe-B is that its working temperature is low, its temperature characteristics are poor, and it is easy to be pulverized and eroded. It must be improved by adjusting its chemical composition and adopting surface treatment to meet the requirements of its essential use. Nd-Fe-B magnetic material, as a new consequence of the development of rare earth permanent magnet material, is known as "Magnet King" because of its excellent magnetic function. Neodymium magnetic material is Pr-Nd metal, ferroboron and other alloys.

Q: What are ferrite magnets used for?

A: They are used in the electronics industry to make efficient magnetic cores called ferrite cores for high-frequency inductors, transformers and antennas, and in various microwave components. Ferrite compounds are extremely low cost, being made mostly of iron oxide, and have excellent corrosion resistance.

Q: How long do ferrite magnets last?

A: Ferrite magnets can last for several years if it is properly used and cared for. Since ferrite magnets are permanent magnets, they will only lose less than 10 percent of their magnetism every 100 years.

Q: Do ferrite magnets rust?

A: Surface rust may develop on the pots over time, but that does not impact the performance of the magnets. The magnets themselves are rust-proof. Ferrite magnets are also resistant to most chemicals. However, solvents and certain concentrated acids may harm the magnets.

Q: Are ferrite magnets permanent?

A: In conclusion, a ferrite magnet, also known as a ceramic magnet, is a type of permanent magnet that is made up mostly of a material called iron oxide.

Q: Are ferrite magnets fragile?

Q: What is the difference between ferrite and magnets?

A: Ferrite magnets have a higher Curie temperature than Neodymium magnets, so they maintain their magnetization better at higher temperatures. This gives designers greater operating margins at higher temperatures than Neodymium magnets offer.

Q: What are the different grades of ferrite magnets?

A: There are presently 27 grades of ferrite magnet available. The two main grades used today are C5 (also known as Feroba2, Fer2, Y30 and HF26/18) and C8 (also known as Feroba3, Fer3 and Y30H-1). C 5 / Y30 is a general choice of ferrite magnet for applications such as overband magnets.

Q: Can you cut ferrite magnets?

A: We can cut ferrite magnets without losing the magnetism. While this is possible under ideal circumstances, it is extremely difficult to perform correctly. If one is not careful, a powerful magnet will rapidly implode, or lose its magnetic field.

Q: How strong is a ferrite magnet?

A: The strength of ferrite and ceramic magnet is measured through a unit called a Tesla. The strongest magnetic field of a ferrite magnet is considered to be 0.35 Tesla. A ferrite magnet is able to complete within its magnetic field is up to 160 kiloampere tpm, or up to 2000 oersteds.

Q: What are ferrite magnets made of?

A: Ferrite magnets (Ceramic Magnets) are produced by calcining (at between 1000 to 1350 degrees C) a mixture of iron oxide (Fe2O3) and strontium carbonate (SrCO3) or barium carbonate (BaCO3) to form a metallic oxide.

Q: What is the symbol for a ferrite magnet?

A: 6Fe2O3 and SrO. 6Fe2O3 (the chemical symbols for each type of ferrite), but Strontium (Sr) version of ceramic ferrite magnet has stronger magnetic properties.

Q: Are ferrite magnets conductive?

A: Ferrite magnets are non-conductive and will not corrode as they are essentially already made from rust (iron oxide) and therefore cannot corrode further. They also maintain their performance in high temperatures and can be used in temperatures up to 250 degrees Celsius before any loss in performance occurs.

Q: How do you remagnetize a ferrite magnet?

A: In order to remagnetize the average magnet, you need another larger (and at least as powerful) magnet. Because the good news is that your magnet might still work: it has just lost the original direction of the poles because of rough use or similar. And the "new" magnet will help the weakened magnet to remagnetize.

Q: Are ferrite magnets ceramic?

A: The Ferrite permanent magnet is also known as a ceramic magnet and even as hard ferrite magnet. The name is interchangeable but they all refer to exactly the same material type. They are known as Ceramic Magnets because they are electrically insulating.

Q: What are the benefits of ferrite magnets?

A: Ferrite magnets are the cheapest magnets for simple applications. Compared to neodymium magnets, however, they are also significantly weaker. They withstand temperatures of up to 250 °C, are rust-resistant and therefore suitable for outdoor use.

Q: Are ferrite magnets good?

A: Because of their low production costs and their resistance to heat (up to 250℃) and corrosion, ferrite magnets are among the most popular for everyday applications.

Q: Do ferrite magnets lose their magnetism?

A: Ferrite magnets do lose some magnetic field at higher temperatures –losing 0.20%/degree C as the temperature rises.

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