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Characterization of Magnetic Shape Memory ( MSM ) Material and its Application in a Hybrid Micro Actuator

Magnetically controlled shape memory (MSM) alloys have extraordinary elongation capabilities. While both the inverse piezoelectric effect (in piezoelectric materials) and Joule’s magnetostriction (in soft magnetic materials) result in changes in length approx. 0.2 %, a change in length of up to 10 % has been observed in a Ni-Mn-Ga, an MSM alloy. To demonstrate the feasibility of using MSM material in microactuation, magnetically induced elongation tests were performed. Furthermore, a hybrid microactuator uses thin film coils and a pair of Ni-Mn-Ga stripes in a “push-push” mode is suggested.