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Definition and Applications of Ferrites Magnets

by AOMag | post a comment

Ferrite is a metal oxide with ferromagnetic properties. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite are also shown to have higher magnetic permeability at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high frequency and weak current. Due to the low magnetic energy stored per unit volume of ferrite, the saturation magnetization strength is also low (usually only 1/3 to 1/5 of pure iron), thus limiting its application in the field of low frequency power and high power, which requires high magnetic energy density.

Ferrite magnets are widely used in electroacoustics, telecommunications, electric meters, motors, memory components, microwave components, etc. It can be used to record language, music, magnetic tapes of image information, magnetic storage devices of computers, passenger vouchers and magnetic cards for fare settlement, etc. After the hard magnetic material is magnetized, there is still remanence, and the strength and direction of the remanence depend on the strength and direction of the magnetization.

Video tapes and audio tapes use the same material and principle of action, but the recordings record electrical signals representing sound, while video recordings record television signals representing scenery. There are not only sound signals but also image signals in TV signals. Compared with audio tapes, video tapes have a higher recording density, because the recording wavelength of video tapes is on the order of microns. In order to have sufficient sensitivity and signal-to-noise ratio in this wavelength range, the particle size of the magnetic body must be small, and the surface of the magnetic layer must be smooth. Moreover, the wear resistance of the surface of the magnetic layer must be good, so that it can be used under the conditions of high-speed friction with the magnetic head and friction with the fixed part of the tape conveying system. For this purpose, the adhesives used must be heat-resistant and wear-resistant.

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