Abstract
The reversible magnetostrain was investigated in a Ni30Cu8Co12Mn37Ga13 single crystal undergoing the magnetic-field-induced reverse martensitic transformation. A 0.14% reversible magnetostrain was monitored in the as-grown single crystal and it decreased to 0.08% after magnetic field cycling. By 5cycles of thermo-mechanical training under 38MPa, the reversible magnetostrain could be effectively increased to 0.47%, which is the largest value as reported in the samples without the constraint of external stress. It was revealed that the preferential orientation of the martensitic variants was formed after thermo-mechanical training, thus contributing to the large reversible magnetostrain.
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