A METHOD OF COERCIVE FORCE MEASUREMENT WITH SURFACE-MOUNTING MAGNETICDEVICES

Studies have been made an the field strength near a ferromagnetic magn etized by a surface-mounting device SMD having a Pi-shaped circuit. Fo r a certain current in the winding and a certain relation between the sizes of the specimen and the poles, an almost uniform magnetic field is set up between the poles, whose strength is equal to the value of t he internal field and is close to the coercive force H-c. If the field is measured at that instant in the space between the poles, one can d etermine H-c quite accurately, and when the specimen is reversed along the recovery curve from the partially demagnetized state, one can det ermine the retaining force h(c) in the monitored area.