Permanent magnetic materials, also known as "hard magne […]
Permanent magnetic materials, also known as "hard magnetic materials", refer to materials that can maintain a constant magnetic property once magnetized. In practice, the permanent magnet material works in the second quadrant demagnetization part of the hysteresis loop after deep magnetic saturation and magnetization. Commonly used permanent magnet materials are divided into aluminum nickel cobalt permanent magnet alloy, iron chromium cobalt permanent magnet alloy, permanent magnet ferrite, rare earth permanent magnet material and composite permanent magnet material.
Magnetic material is an ancient and young versatile basic functional material. In the long-term development process, its application has penetrated into all aspects of the national economy and national defense. Magnetic material itself has also been greatly developed.
Classification of permanent magnetic materials:
The first category is: alloy permanent magnet materials: include neodymium magnet, samarium cobalt (SmCo) magnet, and aluminum nickel cobalt (AlNiCo) magnet,
The second category is: Ferrite permanent magnet materials (Ferrite)
is divided according to different production processes: sintered ferrite, bonded ferrite, injection ferrite, these three processes are divided into isotropic and anisotropic magnets according to the different orientation of the magnetic crystal.
These are the main permanent magnet materials on the market, and some are eliminated due to the original production process or cost reasons, such as Cu-Ni-Fe (copper nickel iron), Fe-Co-Mo (iron cobalt molybdenum) , Fe-Co-V (iron cobalt vanadium), MnBi (manganese bismuth).