Magnetomechanical Properties of Polycrystalline Ni-Mn-Ga Thin Film Actuators

Anurag Agarwal 2,4Manfred Kohl 2Volodymyr A. Chernenko 3M. Ohtsuka 1

1. Tohoku University, Sendai, Japan
2. Forschungszentrum Karlsruhe, IMT, Postfach 3640, Karlsruhe 76021, Germany
3. Institute of Magnetism NASU (IMag), Vernadsky 36-b, Kyiv 03142, Ukraine
4. Indian Institute Of Technology,Kharagpur (IIT), Kharagpur, India

Abstract

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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Presentation: oral at E-MRS Fall Meeting 2005, Symposium C, by Anurag Agarwal
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-20 15:35
Revised:   2009-06-07 00:44