Estimation of the Pressure Effect of the Absolute Saturation Magnetization of Au_4Mn, Indium Heusler Alloy and MnSb by Forced Magnetostriction Measurement

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The forced magnetostriction constants of the ferromagnetic alloys Au4Mn, Cu2Mn1.2In0.8 and MnSb were measured up to a magnetic field intensity of about 20 kOe over a temperature range from liquid air temperature to room temperature. By means of thermodynamical relations, the pressure coefficient of the absolute saturation magnetization $1/\sigma_{0}{\cdot}(\text{d}\sigma_{0}/\text{d}p)$ was found to be $-3.7\times 10^{-11}$ (cm2/dyne) for Au4Mn, $-0.055\times 10^{-11}$ (cm2/dyne) for Cu2Mn1.2In0.8 and $-0.59\times 10^{-11}$ (cm2/dyne) for MnSb, respectively. From these results and a relation based on the molecular field theory, the pressure coefficients of the exchange interaction $1/J{\cdot}(\text{d}J/\text{d}p)$ are estimated to be $8.2\times 10^{-11}$ (cm2/dyne) for Au4Mn, $0.44\times 10^{-11}$ (cm2/dyne) for Cu2Mn1.2In0.8 and $0.60\times 10^{-11}$ (cm2/dyne) for MnSb, respectively. The dependence of the exchange interaction on lattice constant is discussed.
社団法人日本物理学会の論文
1976-02-15