Soft magnetic material refers to a type of ferrite material that is easily magnetized and demagnetized under weak magnetic fields (as shown in Figure 1). The typical representatives of soft magnetic materials are manganese zinc ferrite Mn ZnFe2O4 and nickel zinc ferrite Ni ZnFe2O4.

Soft ferrite is a type of ferrite material with a wide range of uses, a large quantity, a large variety, and a high output value among various ferrite materials. Currently, there are dozens of products produced in batches in the world, with an annual output of over tens of thousands of tons.

Soft magnetic ferrite is mainly used as various inductance components, such as filter cores, transformer cores, antenna cores, deflection cores, as well as magnetic cores for magnetic tape recording and recording heads, multi-channel communication, and other recording heads.

Generally, the crystal structure of soft ferrite is Cubic crystal system spinel type, which is used in the audio frequency to Very high frequency frequency band (1 kHz -300 MHz). However, soft magnetic materials with hexagonal magnetic lead stone crystal structure have several times higher application frequency limits than spinel type.