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Permantent Magnet Materials
 



The permanent magnet family consists of non-rare earth permanent magnets and rare earth magnets. The non-rare earth magnets include Alnico (Aluminum-Nickel-Cobalt) magnets and Ceramic (Strontium and Barium Ferrite) magnets. Rare earth magnets include SmCo (Samarium-Cobalt) magnets and NdFeB (Neodymium-Iron-Boron) magnets.

Although non-rare earth magnets are used in the majority of these applications due to their economic cost, rare earth permanent magnets have many distinguishing characteristics, such as a large Maximum Energy Product and high Coertive Force. Dozens of magnetic materials which contain rare earth materials have been developed recently. Two major families of rare earth permanent magnets, SmCo magnets and NdFeB magnets, have been widely used in a variety of applications. Each family has its own advantages and disadvantages.

Neodymium-Iron-Boron (NdFeB) Magnets
Samarium-Cobalt (SmCo) Magnets
Aluminum-Nickel-Cobalt (AlNiCo) Magnets
Strontium and Barium Ferrite (Ceramic) Magnets
Bonded NdFeB and Hard Ferrite Magnets
Flexible Rubber Magnets


Bonded magnets are special composite. Thermo-elastomer and thermo-plastic resins can be blended together with various magnetic powders to form injection molded, compression and flexible magnets. Flexible magnets can be either isotropic and anisotropic. The anisotropic flexible magnets are made by extrusion or injection. Properties such as high elasticity, flexibility and machinability make these magnets a favorite candidate for many permanent magnet applications in industry and in home appliances.


Further Information on Rare Earth Permanent Magnets
Further Information on Permanent Magnets


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