Magnetization and demagnetization cur

关键词:花毛:10000
摘要:<正> Magnetization and demagnetization curves and hysteresis loops applied different magnetizing.fields magnetic materials
http://www.999magnet.com insintered Nd-Fe-B and Nd-Dy-Fe-B magnets from thermally demagnetized and dc field-demagnetizedstates were investigated at temperatures of up to 150℃.The first-quadrant remagnetization curves and thecurves of coercive forces _MH_C versus rernagnetizing fietds H_m from dc field-demagnetized state at roomtemperature show a step around magnetizing field as absolute value of the maximum intrinsic coercivity.Thesteps of _MH_C-H_m curves shifted to lower remagnetizing fields and the shapes of magnetization curveschanged from step type to precipitous type when temperature went up to 100～150℃ or after the specimenwas thermally demagnetized at a temperature higher than the Curie temperature.The steep rise of kneecoereivity with increasing magnetizing field is behind that of _MH_C.Note that the magnetic hardening insintered Nd-Fe-B magnets is controlled by pinning of domain walls.