Field-Induced Strain of Shape Memory Alloy Fe–31.2%Pd Using a Capacitance Method in a Pulsed Magnetic Field

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A system for the simultaneous measurement of magnetization and magnetic strain, which is designed to be used in a pulsed magnetic field, has been developed. In this system, a capacitor on a sample is used and its capacitance changes with the displacement of a sample due to the strain on the sample in a magnetic field. The most significant feature of this system is that magnetization and strain can be measured simultaneously. It is useful to compare the magnetization and magnetic strain (magnetostriction) with each other. Using this system, we have studied the precise magnetization and magnetic field-induced strain (MFIS) of the martensite metallic compound Fe–31.2%Pd (at.%) at temperatures down to 80 K in martensite phase, which is much lower than the martensitic transformation temperature $T_{\text{M}}=230$ K. Large MFIS has been measured under a pulsed magnetic field with the time constant 6 ms, which corresponds to 80 Hz in frequency. It means that the MFIS occurs even in short-pulse magnetic fields.
2004-11-15