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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.
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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.
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