Two Kinds of Different Effect of Pressure on Magnetism in Amorphous Alloys with Fe-Base

The paper introduces in detail the experimental method to measure the saturation intensity of magnetization Bs and the maximum magnetic permeability max of amorphous alloy under hydrostatic pressures from 0.000 1 to 2.3 GPa. The results show that Bs and max of three amorphous alloys are different from each other, can be classified into two kinds. (1) The first kind of pressure effect on magnetism: general trendBs decreases when pressure increases, but in some pressure ranges Bs presents an anomalous rise, such as even decrease of Bs in amorphous alloy Fe75Ni5Si5B15, drop-rise-drop again of Bs in amorphous alloy (Fe0.85Co0.15)Cu0.4Si4.4B13.2. (2) The second kind of pressure effect on magnetism: Both Bs and max of amorphous alloy Fe78.75Cu1.25Si5B15 rise weakly when pressure increases. This is a new result. Respectively we discussed (1) and (2) by exchange-role theory of located electron-mode and rigid band theory of itinerant electron mode.