6. Materials with rectangular hysteresis cycles

This type of cycle is typical of most permanent magnets (very high coercive field: H _c > 1 kOe, i.e. 80 kA/m).

The combination of metallurgy and magnetism has made it possible to offer alloys of the same type with lower H _c (10 to 500 Oe, i.e. 0.8 to 40 kA/m), which can therefore be easily converted from a magnet to a soft material when required by the application (anti-theft tag, bistable relay, hysteresis motor, etc.)....) or,...