The material and principle of action used in the video tape and the recording tape are basically the same, but the recording records the electrical signal representing the sound of the ferrite magnetic tile, and the video records the television signal representing the scene. Compared with audio tapes, video tape recording has a high density because video tape recording wavelengths are in the order of microns, which is sufficient sensitivity and signal-to-noise ratio in this wavelength range. Magnetic body size must be small, and magnetic layer electric motor. The magnetic tile surface must be smooth. Moreover, the wear resistance of the magnetic layer surface must be good, so that it can be used under the conditions of high-speed friction of the same head and friction of the fixed part of the transmission system of the same tape. For this purpose, the binder used must be heat-resistant and wear-resistant.
Soft magnetic materials, such materials are easily magnetized and demagnetized under weaker magnetic fields, such as zinc Chromium ferrite and nickel zinc ferrite. Soft magnet oxygen body is a kind of ferrite material with wide use, large variety, large quantity and high output value. It is mainly used as a variety of inductive elements, such as filter cores, Transformer cores, wireless electromagnetic cores, and tape recording and video heads. It is also a key material for magnetic recording elements.

It is mainly used as a variety of inductive elements, such as filter cores, Transformer cores, wireless electromagnetic cores, and tape recording and video heads. It is also a key material for magnetic recording elements.
A compound of hexagonal structures having a uniaxial Anisotropy. It is mainly barium, strontium, lead three kinds of ferrite and its compound solid solution. There are same-sex magnetism and heteromagnetic magnetism. Since this type of ferrite material disappears from the external magnetization field, it can still retain a strong constant residual magnetic property for a long time and can be used to generate a stable magnetic field in external space. It is widely used, for example, as a permanent magnet in various meters, generators, telephones, speakers, televisions, and microwave devices.
Hard magnetic material, ferrite hard magnetic material is not easy to demagnetize after magnetization, so it is also called permanent magnetic material or constant magnetic material. Such as barium ferrite, iron oxygen and so on. It is mainly used for recorders, pickups, speakers, magnetic cores of various instruments in telecommunications devices.
The spin magnetism of magnetic materials and magnetic materials refers to the fact that under the action of two mutually perpendicular stable magnetic fields and electromagnetic magnetic fields, Planar polarized electromagnetic waves propagate in a certain direction within the material, but their polarized surfaces will continue to revolve around the propagation direction. The phenomenon of rotation. Although metal and alloy materials also have a certain degree of spin magnetism, because the resistivity is low and the eddy current loss is too large, electromagnetic waves can not penetrate deep into their interior, so they can not be used. Therefore, the application of spin magnetism of ferrite spin magnetic material has become a unique field of ferrite. Most of the rotating magnetic materials consist of various microwave devices such as wave ducts or transmission lines that transmit microwaves. It is mainly used in radar, communication, navigation, telemetry and other electronic equipment.
Moment magnetic material, which refers to an ferrite material with a rectangular hysteresis loop. It is characterized by the fact that when there is a small external magnetic field, it can magnetize it and reach saturation. After removing the external magnetic field, the magnetism remains the same as when it is saturated. Such as magnesium manganese ferrite, lithium manganese ferrite and so on. This ferrite material is mainly used for memory cores of various electronic computers.
Magnetizing materials, which refer to ferrite materials that are mechanically elongated or shortened in the direction of the magnetic field during magnetization, such as nickel-zinc ferrite, nickel-copper ferrite and nickel-chromium ferrite. Magnetizing materials are mainly used as transducers for the conversion of electromagnetic energy and mechanical energy, and for magnetostrictive elements for ultrasound.