Abstract
The singular point detection technique has been applied to determine the magnetic anisotropy constant K1 of small martensitic Ni49.0Mn23.5Ga27.5 (wt %) single crystals with a martensitic transformation temperature TM of 276K. As expected, K1 increases with decreasing temperatures below TM, following a magnetization power law K1(T)∕K1(0)=[Ms(T)∕Ms(0)]3. At 5K, K1 reaches 3.24×105J∕m3. The force required to initiate twin boundary motion increases exponentially with decreasing temperature. The combination of both temperature dependences leads to a very restricted temperature window for magnetic actuation using this alloy.
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