EPJ Special Topics

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Eur. Phys. J. Special Topics 158, 113-118 (2008)
DOI: 10.1140/epjst/e2008-00662-6

Ferromagnetic resonance in Ni-Mn-Ga thin films and thin-film tubes

J. Dubowik¹, I. Goscianska² and Y. Kudryavtsev³

¹ Institute of Molecular Physics, PAS, M. Smoluchowskiego 17, 60-179 Poznan, Poland
² Department of Physics, A. Mickiewicz University, Umultowska 85, 61-014 Poznan, Poland
³ Institute of Metal Physics, NAS of Ukraine, 36 Vernadsky Ave., 03142 Kiev, Ukraine

dubowik@ifmpan.poznan.pl

(Published online: 1 May 2008)

Abstract
We report on FMR experiments performed for the first time on thin Ni-Mn-Ga films clamped to the mica substrates and then fully released from them. The aim is to evaluate the role of magnetoelastic coupling in stressed Ni-Mn-Ga Heusler alloy films that undergo martensitic transformation. The experimental results show that the difference in the effective magnetization $4\pi(M_{\rm {eff}} ^ {\rm {tubes}}-M_{\rm {eff}} ^ {\rm {films}})$ is negligible in the austenite phase and it increases to about 1-1.5 kG at temperatures well below the martensitic transformation. The data suggests that magnetoelastic coupling in the martensite phase of Ni-Mn-Ga thin films is typical of normal thin magnetic films with magnetostriction of about 50 ppm.