How to judge the hard and soft magnetic material accurately, why?
The size of the coercive force Hc can be obtained by the hysteresis loop diagram experimentally determinedPure iron, silicon steel, ferrite material coercivity Hc is very small, these are soft magnetic materials, commonly used as relays, transformers, electromagnets core
Hard magnetic materials and soft magnetic materials is based on the coercive force of the material Hc size determinationJudge the memory ability of the magnetization state
Carbon steel, tungsten steel, aluminum nickel cobalt alloy material with large coercivity, remanence is also large, once they are magnetized to the applied magnetic field has larger resistance, it can be said that they have for the magnetization state of "memory" which is characteristic of magnetic material, used to make permanent magnet, the original memory records tape or computer
