Spin magnetic materials
The spin magnetism of magnetic materials refers to the phenomenon that the plane polarized electromagnetic waves will continuously rotate around the propagation direction although the plane polarized electromagnetic waves propagate inside the material in a certain direction under the action of two mutually perpendicular steady magnetic fields and electromagnetic wave magnetic fields. Although metal and alloy materials also have certain spin magnetism, they cannot be used because of low resistivity and too large eddy current loss, and electromagnetic waves cannot penetrate deep into their interior. Therefore, the application of ferrite spin magnetic material spin magnetism, it becomes the unique field of ferrite. Spin magnetic materials are mostly used with the transmission of microwave waveguide or transmission lines and other components of various microwave devices. They are mainly used in electronic devices such as radar, communication, navigation, and telemetry.
Momentary magnetic materials
This refers to ferrite materials with rectangular hysteresis lines. It is characterized by the fact that when there is a small external magnetic field, it can be magnetized and saturated, and after removing the external magnetic field, the magnetic properties remain the same as when saturated. Such as magnesium manganese ferrite, shaped magnets such as lithium manganese ferrite is this. This kind of ferrite material is mainly used in the memory cores of various electronic computers, etc.
Pressure magnetic materials
This kind of material refers to the magnetization in the magnetic field direction for mechanical elongation or shortening of the ferrite materials, such as nickel-zinc ferrite, nickel-copper ferrite and nickel-chromium ferrite, etc.. Piezomagnetic materials are mainly used as transducers for the conversion of electromagnetic energy and mechanical energy, and as magnetostrictive elements for ultrasound.
Soft magnetic materials
These materials are easy to magnetize and demagnetize under weak magnetic fields, such as zinc-chromium ferrite and nickel-zinc ferrite. Soft magnetic ferrite is a kind of ferrite material with wide use, many varieties, large quantity and high production value at present. It is mainly used as a variety of inductive components, shaped magnets such as filter cores, transformer cores, radio cores, as well as tape recording and video heads, etc. It is also a key material for magnetic recording components.
Permanent Magnet Ferrite
A compound with a uniaxially anisotropic hexagonal structure. Mainly barium, strontium, lead ferrite and its compound solid solution. There are homogeneous and anisotropic magnets. Since these ferrite materials retain a strong constant remanent magnetic property long after the external magnetization field disappears, they can be used to generate a constant and stable magnetic field to the external space. They are used in a wide range of applications, for example, as constant magnets in various types of electric meters, generators, telephones, speakers, televisions and microwave devices.
Hard Magnetic Materials
Ferrite hard magnetic materials are not easily demagnetized after magnetization, therefore, they are also called permanent magnetic materials or constant magnetic materials. Such as barium ferrite, steel ferrite, etc. Shaped magnets it is mainly used in telecommunication devices such as recorders, pickups, speakers, magnetic cores of various instruments, etc.