Are nails hard or soft magnetic materials?
Is soft magnetic, iron nail itself does not have magnetism, is the external magnetic material, magnetized with magnetic, once the outside of the magnetic material removed, the iron nails still do not have magnetism
The coercivity of magnetic material): (Hc) (>102A/m), high remanence Br, hysteresis loop area is big, big loss. For example, tungsten steel, carbon steel, aluminum nickel cobalt alloy. Application: the magnetic hysteresis loop is wide, and it can keep magnetism for a long time after being magnetized. It is suitable for making permanent magnet, permanent magnet and permanent magnetic loudspeaker in magnetoelectric meter.
Soft magnetic material: permeability is large, easy to magnetize, easy to demagnetization (initial magnetic susceptibility is large). The saturation magnetic induction intensity is large, the coercivity (Hc) is small, the hysteresis loop area is narrow and long, and the loss is small (HdB area is small). They include magnetic pure iron, silicon steel, permalloy (Fe, Ni) ferrite, etc.. Apply to relay, electric and magnetic core, high frequency components of the electromagnetic magnet.
