Magnetization Character of Amorphous Magnetic Alloys at High Hydrostatic Pressure

Magnetization curves and magnetic permeability of amorphous alloys FeCoNiSiVB, FeSiB, FeCrSiB, FeCoSiB in the hydrostatic pressure range of 0.000 1~2.4 GPa were investigated. Besides, the relation between pressure and the maximum magnetic permeability max of the four alloys was obtained with accurate fitting of the polynomial and comparing of computer one by one. It is found that (1) for intensity of magnetic induction Bs the general trend is to decrease with the increase of pressure; (2) in 2~3 pressure range, Bs presents a anomalous rise. In our discussion, (1) is due to the fact that exchange-integral constant A drops with the reduction of atomic interval, which causes the intensity of spontaneous magnetization to descend in magnetic domain; (2) probably comes from some changes of chemical short range order in microscopic structures of amorphous alloys at high pressure.