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Magnetic properties, structure and shape-memory transitions in Ni-Mn-Ga thin films grown by ion-beam sputtering

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4 Author(s)
Jae-Pyoung Ahn ; Ceramic Process. Res. Center, Korea Adv. Inst. of Sci. & Technol., Seoul, South Korea ; Ning Cheng ; T. Lograsso ; K. M. Krishnan

Ni1-2xMnxGax (x~0.2 and 0.25) alloys in thin film form were prepared by ion-beam sputtering from alloy targets. For Si(001) substrates the structure/texture of the films are a function of the growth temperature (Tg). The tetragonal martensite structure with a (220) texture was obtained for an optimal T g~300-350°C. At higher temperatures a cubic silicide (Mn 12Ni4Si3) was obtained. At room temperature, optimal films with the stoichiometric composition (x ~ 0.2) showed a ferromagnetic hysteresis behavior characterized by significant in-plane rotation. The coercivity of the films was 310 Oe and temperature-dependent measurements confirmed a Curie temperature, Tc~340 K. At room temperature the films show a modulated 7M martensite structure which was observed in in situ heating experiments to transforms to the cubic austenite phase at 500°C

Published in:

IEEE Transactions on Magnetics  (Volume:37 ,  Issue: 4 )