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We analyze the effect of temperature coupled to dc or ac magnetic fields on the strain properties of an oriented single crystal of Ni 2 MnGa. The sample has an austenite-martensite phase transformation temperature T M = 160 K and reverse transformation at T A = 180 K. No external stress was applied before or during the tests. It is shown that the shape memory features may be deeply influenced by the presence of external magnetic fields: during heating or cooling through the transformation an ac field applied along the [100] direction is able to trigger an irreversible strain of 2.5% [100] at T A . This value can be compared with a 1.2% [100] strain with a dc field and about 0.17% in absence of field (both at T A ). The peak cyclic strain at T A is 0.45% when a cyclic field is applied at constant temperature.It is shown that, in this single crystal, twin rearrangements leading to large values of strain only occur in limited temperature ranges, in correspondence with the phase transformations at T M and T A .Index Terms-Magnetic shape memory alloys, magneto-elastic materials and magnetostriction, martensite twins, NiMnGa.

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Cited by 2 publications

References 3 publications

A Note on the Theory of Stability of Impulsive Systems with Structural Perturbations

A Note on the Theory of Stability of Impulsive Systems with Structural Perturbations

Field and temperature induced giant strain in single crystal Ni-Mn-Ga

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