Magnetic-field-induced strain of shape-memory alloy Fe₃Pt studied by a capacitance method in a pulsed magnetic field

The precise magnetic-field-induced strain (MFIS) and magnetization of the martensite metallic compound Fe₃Pt in a martensitic phase were studied in a pulsed magnetic field using the capacitance method at low temperatures down to 4.2 K, which is much lower than the martensitic transformation temperature T_M = 85 K. After zero field cooling, a pulsed magnetic field with a maximum frequency of 160Hz was applied parallel to the [001]_p axis. A large MFIS was measured. The value of the MFIS is ΔL/L = -1.7%. When the magnetic field was decreased, the recovery of the strain was observed. In the second applied field, a strain of about 0.6% was observed. This means that MFIS occurs even in short-pulse magnetic fields. MFIS was observed below 70 K. The largest strain was observed at 20 K. These results are almost the same as the MFIS in a steady magnetic field using a superconducting magnet.