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

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

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

Corresponding author: dubowik@ifmpan.poznan.pl

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 4π(M_eff ^tubes-M_eff ^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.