Hydrostatic Pressure Dependence of Forced Volume Magnetostriction of Seven Amorphous Alloys
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摘要: 强制体积磁致伸缩的数量级极小（10-10~10-9[(103/4)(A/m)]-1），如通过测量三个互成直角方向的线磁致伸缩（10-6[(103/4)(A/m)]-1）再正负迭加则很难测准。本文利用热力学关系：(d/dH)T,p=-(dMs/dp)T,H，用静水压法在0.000 1~2.4 GPa范围测得七种非晶合金Fe81.6Si4.6B13.8、Fe46.3Co0.03Ni46.5Si3.75V0.92B2.5、Fe75Cr5Si5B15、Fe73.9Co8.3Si4.4B13.4、Fe75Ni5Si5B15、Fe78.75Cu1.25Si5B15和(Fe0.85Co0.15)82Cu0.4Si4.4B13.2的强制体积磁致伸缩及其随静水压p的变化。结果表明：（1）其中六种属于第一类压磁效应。(d/dH)T,p在大部分压力下为正，p增加时Ms不断减小；(d/dH)T,p仅在几个狭窄的压力范围为负。可归因于磁性原子与非磁性原子的化学短程序在压力下的变化。（2）非晶合金Fe78.75Cu1.25Si5B15属于第二类压磁效应。(d/dH)T,p在绝大部分压力下为负。Ms反常升高与Cu的特殊作用有关。Abstract: Forced volume magnetostriction is too minute 10-10~10-9[(103/4)(A/m)]-1 to be measured accurately by repeated addition of linear magnetostriction 10-6[(103/4)(A/m)]-1. According to thermodynamic relation, (d/dH)T,p=-(dMs/dp)T,H ,we measured the Ms-p curve and obtained the hydrostatic pressure dependence of forced volume magnetostriction of seven amorphous alloys－Fe81.6Si4.6B13.8, Fe46.3Co0.03Ni46.5Si3.75V0.92B2.5, Fe75Cr5Si5B15, Fe73.9Co8.3Si4.4B13.4, Fe75Ni5Si5B15, Fe78.75Cu1.25Si5B15 and (Fe0.85Co0.15)82Cu0.4Si4.4B13.2 in the range from 0.000 1 to 2.4 GPa. The results show clearly two kinds. (1) Six of them belong to the first type of pressure effect on magnetism. (d/dH)T,p is positive under most of pressure, i. e. Ms diminishes when p increases. (d/dH)T,p is negative only in some narrow ranges of pressure. It is due to variation of chemical short range order which is composed of magnetic atoms and non-magnetic atoms under different pressure. (2) Amorphous alloy Fe78.75Cu1.25Si5B15 belongs to the second type of pressure effect on magnetism. (d/dH)T,p is negative under most of pressure. Anomalous rise of Ms is related to the special role of Cu.
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