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Magnetic properties of submicron Ni-Mn-Ga martensitic thin films1

  • M. Kohl (a1), V.A. Chernenko (a1), M. Ohtsuka (a1), H. Reuter (a2) and T. Takagi (a3)...


Two series of Ni-Mn-Ga thin films with two different compositions and various thicknesses in the submicron range are investigated with respect to their structural and magnetic properties. The films are fabricated by sputter deposition on alumina substrates and subsequent heat treatment. The martensitic transformation occurs well above room temperature showing a small thermal hysteresis width of about 6 K. The magnetic properties turn out to be thickness-dependent in the submicron range. In particular, in-plane magnetic susceptibilities increase and critical field strengths for onset of saturation decrease for decreasing thickness down to 0.1 μm by factors of 3–5 depending on the chemical composition. The Curie temperature TC decreases by about 25 K for samples with TC higher than the martensitic transformation.



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1. Suorsa, I., Tellinen, J., Paguonis, E., Aaltio, I. and Ullakko, K., Applications of magnetic shape memory actuators, Proc. Actuator 2002, pp. 158161.
2. Ohtsuka, M. and Itakagi, K., Effect of heat treatment on properties of Ni-Mn-Ga films prepared by a sputtering method, Int. J. of Appl. Electromagn. Mech. 12, 4959 (2000).
3. Wuttig, M., Craciunescu, C. and Li, J., Phase transformations in ferromagnetic NiMnGa shape memory films, Materials Transactions JIM 41, 933–37 (2000).
4. Isokawa, S., Suzuki, M., Ohtsuka, M., Matsumoto, M. and Itagaki, K., Shape memory effect of sputtered Ni-rich Ni2MnGa alloy films aged at constraint condition, Materials Transactions JIM 42, 18861889, (2001).
5. Tello, P.G., Castano, F.J., O'Handley, R.C., Allen, S.M., Esteve, M., Castano, F., Labarta, A. and Battle, X., Ni-Mn-Ga thin films produced by laser deposition, J. Appl. Phys. 91, 82348236 (2002).
6. Rumpf, H., Feydt, J., Levandovski, D., Ludwig, A., Winzek, B., Quandt, E., Zhao, P. and Wuttig, M., Shape memory effect and magnetostriction of sputtered NiMnGa thin films, SPIE Proc. Series 5053, 191199 (2003).
7. Kohl, M., Hoffmann, S, Liu, Y., Ohtsuka, M. and Takagi, T., Optical scanner based on a NiMnGa thin film microactuator, J. Phys. IV France 112, 11851188 (2003).
8. Dubowik, J., Kudryavtsev, Y.V. and Lee, Y.P., Martensitic transformation in Ni2MnGa films: A ferromagnetic resonance study, J. Appl. Phys. 95, 29122917 (2004).
9. Ohtsuka, M., to be published.
10. Ahn, J.P., Cheng, N., Lograsso, T. and Krishnan, K.M., Magnetic properties, structure and shape memory transitions in Ni-Mn-Ga thin films grown by ion-beam sputtering, IEEE Trans. Magn. 37, 21412143 (2001).

Magnetic properties of submicron Ni-Mn-Ga martensitic thin films1

  • M. Kohl (a1), V.A. Chernenko (a1), M. Ohtsuka (a1), H. Reuter (a2) and T. Takagi (a3)...


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