A series of experiments have been performed on bending, tensile and bridge actuators of polycrystalline Ni-Mn-Ga thin films, to observe the effects of applied tensile load and varying magnetic field on the field-induced strain in martensitic state. Ni-Mn-Ga thin films of 10µm thickness have been deposited by magnetron sputtering. The actuators have been fabricated by photochemical micromachining and MEMS-based interconnection technology. An interesting enhancement of magnetostrain is noticed for both, tensile and bridge actuators. For tensile actuators, the maximum magnetostrain is evaluated to -2470 ppm at 0.5 T and a stress of 7 MPa, which is considerably larger than the ordinary magnetostriction of -240 ppm for a reference thin film of 1 µm thickness. A trend of decrease in magnetostrain is noticed for increasing load. The maximum magnetostrain for the bridge actuators is estimated to -710 ppm for a magnetic field of 0.5 T and a stress of 13 MPa. In this case, an increase of magnetostrain is observed for increasing load.

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