Ferrite is a metal oxide of a ferrous alloy. In terms of electricity, ferrites have a much greater resistivity than elemental metal alloy compositions, and also have properties of dielectric. The magnetic energy per unit volume of the ferrite is low When the high frequency is accumulated, the magnetic energy per unit volume of the ferrite is low. (Bs) is also low-strength (only 1/3~1/5 of pure iron), which limits the range of choices and limits the wide range of needs, and can be widely used in normal strong current applications in different fields.
Ferrite is sintered from iron oxides and other ingredients. Generally, it can be divided into three types: permanent ferrite, soft ferrite and gyromagnetic ferrite.
Permanent magnet ferrite is also called ferrite magnet, which is the small black magnet we usually see. Its main raw materials are iron oxide, barium carbonate or strontium carbonate. After magnetization, the strength of the residual magnetic field is very high, and the residual magnetic field can be maintained for a long time. Usually used as permanent magnet material. Example: speaker magnets.
Soft ferrite is prepared and sintered by ferric oxide and one or several other metal oxides (for example: nickel oxide, zinc oxide, manganese oxide, magnesium oxide, barium oxide, strontium oxide, etc.). It is called soft magnetic because when the magnetizing magnetic field disappears, there is little or no residual magnetic field. Usually used as a choke coil, or the core of an intermediate frequency transformer. This is completely different from permanent ferrite.
Gyromagnetic ferrite refers to a ferrite material with gyromagnetic properties. The gyromagnetism of magnetic materials refers to the phenomenon that the plane of polarization of a plane-polarized electromagnetic wave propagates in a certain direction inside the material under the action of two mutually perpendicular DC magnetic fields and electromagnetic wave magnetic fields. Gyromagnetic ferrite has been widely used in the field of microwave communication. According to the crystal type, gyromagnetic ferrite can be divided into spinel type, garnet type and magnetoplumbite type (hexagonal type) ferrite.
Magnetic materials are widely used and can be used in electro-acoustic, telecommunications, electricity meters, motors, as well as memory components, microwave components, etc. It can be used to record language, music, and image information tapes, magnetic storage devices for computers, and magnetic cards for passenger boarding vouchers and fare settlement. The following focuses on the magnetic materials used on the magnetic tape and the principle of action.
Post time: Apr-11-2022
