What are the advantages of black ferrite permanent magnets?

What are the advantages of ferrite? Since a thing has been widely used, it must have its reasons, and its advantages are inevitable. It is learned that ferrite magnet is a kind of metal oxide with ferromagnetism. In terms of electrical properties, the resistivity of ferrite is much higher than that of metal and alloy magnetic materials, and it also has higher dielectric properties.

The magnetic properties of ferrite also show high permeability at high frequency. Therefore, ferrite has become a non-metallic magnetic material widely used in the field of high-frequency weak current. It belongs to non-metallic magnetic material and is a composite oxide (or ferrite) of iron oxide and one or more other metal oxides. The magnetic force is usually 800-1000 Gauss and the density is 5 (g / cm3). It is often used in speakers, speakers and other devices.

In addition, ferrite has good temperature resistance.
Ferrite has good temperature resistance and stability. In contrast, the temperature resistance of NdFeB is only 80 degrees. It has obvious temperature resistance and low price. These are its advantages.