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Ferrite Magnets

Over many years Frenergy has largely become a specialist supplier of Neodymium magnets to meet the growing market demand for Rare Earth products. However, Ferrite magnets remain a practical and cost-effective alternative to Neodymium magnets and Frenergy continues to stock a wide range of ceramic-based magnet products for our customers.

 

Unlike Neodymium Rare Earth magnets which have a polished silver coating, Ferrite magnets, also known as Ceramic Magnets, have a dark-grey colour and stain under friction. Ferrite magnets are stronger than Alnico magnets, however, they are a lot weaker than our number one seller; Neodymium Rare Earth Magnets. The weaker properties of Ceramic magnets make them safer around electronic devices like pacemakers and hearing aids and less likely to interfere with their operation. Having said that, we still recommend a safe distance for both magnet types.


Ferrite Magnetic Properties

Ferrite magnets are attractive to those on a budget because ferrite material is a lot cheaper than Rare Earth material. They have high-temperature resistance (80 - 250 degree Celsius) and much better corrosion resistance. Ideal for outdoor use. Ferrite magnets do not lose their magnetisation over time. They can only be demagnetised by external factors like heat or another strong magnetic field. We also have extensive experience in providing custom magnet orders, so kindly email us with your product requirements for further information.

Ferrite (Ceramic) magnetic material was the most popular and commonly used magnetic material throughout the world for many decades. Ferrite magnets have always ticked a lot of boxes for consumers. The easily recognisable grey, chalky material is lightweight, low cost and, unlike the stronger and much more expensive Neodymium magnetic products, has a very high oxidation resistance. The ceramic nature of Ferrite magnetic products makes them highly resistant to corrosive forces and also heat-tolerant in temperatures up to 250℃ and as low as -40℃. As with other magnetic materials, Ferrite is also a very brittle material and can easily be permanently damaged if impacted by an external force or pressure. Ferrite magnets cannot be screwed, drilled or bent without cracking. To counteract this type of damage and increase their durability, some Ferrite magnets are fitted with a steel cover that helps protect the magnet from accidental impact. These Ferrite Pot magnets also produce a slight increase in holding strength compared to a standard, uncovered Ferrite magnet. The steel casing can also be used as a convenient means to screw or bolt the magnet to another surface so it can be attached to, or removed from, a surface as needed.


Other Ferrite magnets have a rubber-coated exterior that protects the magnet inside. Frenergy has small rubber-coated Ferrite Discs that are sold in a mixed-colour 4-pack that are ideal for magnetic whiteboards at school or in the office.

How to use our Ferrite Magnets

Small or large Ferrite Disc and Block magnets are excellent for hobbies, crafts, and educational purposes and any application where a low strength magnetic field is preferable or an advantage. Once the surface dust has been wiped clean with a cloth these Ferrite magnets can be set in place permanently with epoxy glue. The moderate pull-force of Ferrite magnets is also ideal for use in Latch Magnet door closure devices. Doors and cupboards need to close firmly yet not be too difficult to open. Here too, the fragile Ferrite magnet inside the device is protected by a steel casing to prevent the door from damaging the magnet. A metal striker plate is supplied with the Latch Kits and fixing screws are also included.

Find Ferrite magnets for sale and buy with confidence from the secure Frenergy online store. Free standard shipping Australia-wide applies to all orders over $50! You can see our shipping options and returns policy here.

FAQ


Are ferrite magnets strong?

Generally speaking, it can be said that Ferrite (Ceramic) Magnets have moderate strength or pull force. Although not as strong as a Neodymium magnet, they have more magnetic strength than Alnico magnetic products. In fact, large Ferrite magnets are very strong and the far-reaching magnetic field of Ferrite magnets make them highly suited to swarf metal collection and for metal recycling or metal decontamination. Small Ferrite magnets that are less than 30mm in diameter are not likely to be strong enough to support heavy weights or cause damage.

Do ferrite magnets rust?

No. This is the most beneficial feature and unique aspect of Ferrite magnetic material. If handled with care and not exposed to another strong magnetic field, a Ferrite magnet will not degrade and will keep its magnetic power for many years or even decades to come.

What are ferrite magnets used for?

Ferrite (Ceramic) magnetic material is considered an advantage in applications where high-temperature manufacturing occurs or for outdoor locations where corrosive forces such as saltwater and salt air are experienced. Ferrite magnets are also an ideal option when reducing product manufacturing costs is a bigger priority than the need for magnetic strength.


Ferrite magnets have been used for decades in loudspeakers and audio equipment technology. Other industries and technologies that use Ferrite magnetic material include:

  • Medical diagnostic equipment and instruments
  • Electric motors, generators and alternators
  • Hybrid and Electric Vehicles
  • Flexible magnetic sheets for advertising and promotional products. These contain a Ferrite powder and rubber compound.
  • Large Ferrite ring magnets are the main component in the Magnetron which is responsible for generating the heat energy inside a microwave oven.
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FAQ

How Are Ferrite Magnets Made?
Ferrite magnets are made through a process involving several stages. First, raw materials such as iron oxide and either strontium carbonate or barium carbonate are mixed together. These materials are then milled into a fine powder. The powder is pre-sintered at a high temperature to remove any moisture and to begin the chemical reactions that form the ferrite structure. After cooling, the pre-sintered material is milled again into a fine powder. This fine powder is then pressed into moulds under high pressure to form the desired shape. During this pressing process, the powder is often aligned in a magnetic field to enhance the magnet’s performance in a specific direction. The pressed shapes are then sintered at a high temperature between 1,000°C and 1,300°C, to form a solid, dense magnet. After sintering, the magnets are cooled and may undergo further machining to achieve precise dimensions and surface finish. Finally, the magnets are magnetised by exposing them to a strong magnetic field. This step aligns the magnetic domains within the material, giving the ferrite magnet its permanent magnetic properties. Depending on the application, some ferrite magnets may also receive a protective coating to improve their resistance to corrosion and wear.
What Are The Advantages Of Ferrite Magnets?
Ferrite magnets offer several advantages, from cost to temperature tolerance, which makes them highly versatile and suitable for use in a wide range of applications and industries. Ferrite magnets are cheaper than other types of magnets, such as neodymium magnets, because there is an abundance of their raw materials, making them cost effective to mine and process. The lower cost of extracting and processing the raw materials in ferrite magnets reduces the price for consumers, from domestic use to industrial and commercial uses. They have excellent corrosion resistance, which means they do not require additional coatings for protection against moisture and chemicals. Ferrite magnets also perform well at high temperatures, maintaining their magnetic properties up to 250°C or higher. Ferrite magnets also have high electrical resistance, making them suitable for applications where electrical insulation is necessary. Ferrite magnets are available in a wide range of shapes and sizes, providing flexibility for different design requirements. They also have good stability and durability over time, ensuring consistent performance in long-term applications. All these factors make ferrite magnets an essential component in countless processes and applications, from domestic settings to industrial processing and manufacturing, for tradespeople, in commercial settings and more. Ferrite magnets are the 'Jack of all trades' in the magnet world.
What Are The Applications Of Ferrite Magnets?
Ferrite magnets are used in countless applications, from recording studios to vehicle workshops and classrooms. You'll almost certainly have ferrite magnets doing their job in your kitchen appliances. In the automotive industry, ferrite magnets are used in sensors, motors, and actuators. Ferrite magnets are essential components in household appliances such as refrigerators, washing machines and air conditioners. Ferrite magnets are widely used in loudspeakers and audio equipment for their ability to produce clear sound. In industrial settings, they are used in magnetic separators, lifting devices and holding mechanisms. They are also found in consumer electronics, including magnetic resonance imaging (MRI) machines, printers and magnetic assemblies. Ferrite magnets are also used in educational tools and toys, offering a cost-effective solution for demonstrating magnetic principles.
Are Ferrite Magnets Permanent Magnets?
Yes, ferrite magnets are permanent magnets. They generate a persistent magnetic field due to their internal structure, which maintains alignment of magnetic domains even without an external magnetic field. This reliable characteristic allows them to provide a consistent and long-lasting magnetic force, making them suitable for various applications that require stable and durable magnetic properties.
How Do Ferrite Magnets Compare To Neodymium Magnets?
Ferrite magnets and neodymium magnets differ in several ways. Ferrite magnets are less expensive due to the abundance of their raw materials, making them a cost-effective option. They also have excellent corrosion resistance and can operate at higher temperatures, typically up to 250°C or higher. However, ferrite magnets have lower magnetic strength compared to neodymium magnets. Neodymium magnets are much stronger, offering a higher magnetic field strength and greater energy density. This makes them ideal for applications requiring powerful magnets in smaller sizes. However, they are more expensive, can corrode easily without protective coatings, and have lower maximum operating temperatures, usually around 80°C to 150°C, depending on the grade. Ferrite magnets are preferred for cost-sensitive, high-temperature, and corrosion-resistant applications, while neodymium magnets are chosen for applications needing high magnetic strength and compact size.
What Are The Temperature Limits For Ferrite Magnets?
Ferrite magnets have a relatively high temperature tolerance compared to other types of magnets. Their maximum operating temperature is around 250°C (482°F). Beyond this temperature, ferrite magnets can start to lose their magnetic properties. The Curie temperature, which is the point at which a magnet loses its permanent magnetism, for ferrite magnets is even higher, generally ranging between 450°C to 500°C (842°F to 932°F). This makes ferrite magnets suitable for applications where they will be exposed to high temperatures without significant loss of magnetic performance. Many industries use ferrite magnets because of that high temperature tolerance. Automotive industry uses temperature-resistant ferrite magnets in sensors, motors and ignition systems. Industrial manufacturing relies on them for magnetic separators, motors and holding devices in high-heat environments. Consumer electronics incorporate these magnets in speakers and microwave ovens. The aerospace industry applies them in various systems that must withstand extreme temperature variations. Medical equipment such as MRI machines also use temperature-resistant ferrite magnets. Renewable energy systems, including wind turbine generators, benefit from their stability in varying temperatures. Household appliances like refrigerators, washing machines and ovens use these magnets for their durability. Audio equipment, including loudspeakers, requires these magnets to maintain performance despite heat generation.