Hard magnetic materials refer to materials that are difficult to magnetize and can retain high residual magnetization even after removing external fields. Also known as permanent magnet materials, they refer to materials that are difficult to magnetize and difficult to demagnetize once magnetized. The basic requirement for this material is high coercivity Hc, which is usually reduced to Hc> A material of 1000A/m is called a hard magnetic material. The main use of hard magnetic materials is to make permanent magnets, which generate a constant magnetic field in a certain space Compared with current magnetic fields, the magnetic field generated by it is stable in strength, does not require power, does not generate heat, and has a small volume. Therefore, it is widely used in instruments, telecommunications, electricity, transportation, and daily necessities
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