Ferrite known as ferrite magnets is that we usually see little black magnets. Its raw materials are mainly composed of iron oxide, barium or strontium. After the magnetization, the residual magnetic field strength is high, and the residual magnetic field can be maintained for a long time. Commonly used as permanent magnet materials. For example: speaker magnets.
Ferrite compound having a uniaxial anisotropy of the hexagonal structure. Mainly barium, strontium, lead, and three kinds of ferrite composite solid solution. There are homosexual and heterosexual magnetic magnetic points. Since this type of ferrite material disappeared after the external magnetic field, still retains a strong long constant remanence nature, can be used to generate the external space of constant steady magnetic field. Its application is very extensive, for example: in all types of energy meters, generators, telephones, speakers, televisions and microwave devices are used as permanent magnets.

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