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What is a magnetic material?

Magnetic materials can be said to be old and new. The discovery of magnetic materials is very old, and its use as a compass has created an ancient civilization. With the advancement of science and technology, the development of magnetic materials is also provided by this article. Some of the content is from the Internet. Please contact us for any violation of your rights.
Very quickly, the performance of the original traditional materials has been constantly improved and improved, and more new magnetic properties and magnetic effect materials are continuously emerging. Magnetic materials are provided by ferromagnetic materials or sub-documents, some of which are sourced from the Internet. Please contact us for any infringement of your rights.
Ferromagnetic substances, under the influence of an applied magnetic field H, must have a corresponding magnetization M or magnetic induction B, and the curve of the variation with magnetic field H is called a magnetization curve (M-H or B-H curve).
The magnetization curve is nonlinear and has two characteristics: magnetic saturation and hysteresis. That is, when the magnetic field strength H is large enough, the magnetization M reaches a certain saturation value Ms, and continues to increase H,
Ms remains unchanged; and when the M value of the material reaches saturation, when the external magnetic field H decreases to zero, M does not return to zero but changes along the Ms, Mr curve. Material work <Equivalent to M ~ H curve or B ~ H music
A certain point on the line, which is often called a working point. The magnetic material mainly refers to a material that is directly or indirectly magnetically generated by excessive elements such as iron, cobalt, and nickel alloys. Magnetic material from material and structure
At present, it is divided into two categories: "metal and alloy magnetic material" and "ferrite magnetic material". Ferrite magnetic material is divided into polycrystalline structure and single crystal structure material. In terms of application function, magnetic materials
For: soft magnetic materials, permanent magnetic materials, semi-hard magnetic materials, magnetic recording materials, magnetostrictive materials, magnetron shape memory alloys, giant magnetoresistive materials, giant magneto-impedance materials, magneto-optical materials, microwave magnetic materials
And so on. Soft magnetic materials, permanent magnetic materials, and magnetic recording materials include both metallic materials and ferrite materials; and high-frequency soft magnetic materials and microwave magnetic materials can only be ferrite materials.
High frequency and microwave frequency will produce a huge eddy current effect, resulting in the use of metal magnetic materials can not be used, and the ferrite has a very high resistivity, it will effectively overcome this problem and is widely used. Magnetic material material is widely used in electro-acoustic, telecommunications, electric meters, motors, but also for memory components, microwave components. For magnetic storage of magnetic tapes and computers for recording language, music, and image information
Equipment, passenger voucher and fare settlement magnetic card.

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