Hard Ferrite Magnet In contrast, Ferrite Magnet are made of hard ferrites, which have a high coercivity and high remanence after magnetization. Iron oxide and barium or strontium carbonate are used in manufacturing of Permanent Ferrite Magnet.The high coercivity means the materials are very resistant to becoming demagnetized, an essential characteristic for a permanent magnet. They also have high magnetic permeability. These so-called ceramic magnets are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30 to 160 kiloampere turns per meter (400 to 2000 oersteds).The density of ferrite magnets is about 5 g/cm3. The most common hard ferrites are: Strontium ferrite, SrFe12O19 (SrO·6Fe2O3), used in small electric motors, mi…

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