EXCHANGE-COUPLED HARD MAGNETIC-MATERIALS IN PULSED HIGH MAGNETIC-FIELDS

The effect of the exchange coupling on intrinsic properties such as th e magneto-crystalline anisotropy is summarized. Hysteresis measurement s in high external fields are necessary in order to determine the satu ration magnetization. The anisotropy field is determined by applying t he singular-point detection (SPD) technique. The steps to improve the sensitivity of a pulsed field magnetometer to measure the hysteresis o n single flakes are described. Data are used to analyse the relation b etween the enhanced remanence and the coercivity and to determine the exchange length in exchange enhanced materials. (C) 1998 Elsevier Scie nce B.V. All rights reserved.