The Stability of Magnetic-Field-Induced Strain in a NiMnGa Ferromagnetic Shape Memory Alloy

Abstract:

The stability of magnetic field induced strain (MFIS) in Ni52Mn24Ga24 single crystal under temperature and magnetic field cycling is investigated and the corresponding micro-mechanism is also discussed. It shows that the saturated MFIS is very sensitive to temperature. Below martensitic transformation temperature(Tm), with increasing temperature, the saturated MFIS increases almost linearly. Besides, the saturated MFIS initially decreases with increasing the field cycling number less than four times, then does not change with further increasing the number of field cycles. The decrease of saturated MFIS can be attributed to the decrease of twin boundary mobility, which is related to the crystal defect introduced by immigration of twin boundary under field cycling.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 2025-2028
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.2025
• Online since: January 2005
• Authors: Feng Chen, Zhiyong Gao, Wei Cai, Lian Cheng Zhao
• Keywords: Ferromagnetic Shape Memory, Magnetic Field Induced Strain (MFIS), Stability

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[100] oriented Ni52Mn24Ga24 single crystal at 267K 0 1 2 3 4 5 6 7 8 0. 68 0. 69 0. 70 0. 71 0. 72 0. 73 0. 74 0. 75 0. 76 Number of cycles, N Saturated MFIS.