PREDICTING HYSTERESIS CURVES FROM EBSD TEXTURE DATA IN Nd_2Fe_(14)B-BASED MAGNETS

摘要

Hysteresis curves of high coercivity Sm_2Co_(17) magnets, barium ferrite and NdFeB can be modeled assuming coherent rotation as coercivity mechanism, especially when the grain size is small or nanocrystalline. It is discussed how to predict hysteresis curves from texture data employing the Stoner-Wohlfarth model. The Mr/Ms ratio of an oriented NdFeB magnet was determined to be above 0.9, by means of X-ray diffraction method and EBSD-SEM (Electron Back-Scattered Diffraction in Scanning Electron Microscope).