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13 August 2003 Frequency response of single-crystal Ni-Mn-Ga FSMAs
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Magnetic-field-induced strain in single crystals of Ni-Mn-Ga magnetic shape memory alloys were studied under cyclic field conditions using a compression spring to reset the sample as H→0. Low frequency actuation strain of 2.5% degraded to about 1.5% at an actuation frequency of 500 Hz. Two resonant-like features appear in the ε(f) data, which appear to correspond to a broad test system resonance (100-200Hz) and a sample longitudinal resonance near 350 Hz. The relative phase of field and strain support the assignment of the 350 Hz resonance to the sample.
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Christopher P. Henry, Pablo G. Tello, David Bono, Julee Hong, Ryan Wagner, Jessica Dai, Samuel M. Allen, and Robert C. O'Handley "Frequency response of single-crystal Ni-Mn-Ga FSMAs", Proc. SPIE 5053, Smart Structures and Materials 2003: Active Materials: Behavior and Mechanics, (13 August 2003);

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