Magnetostriction and angular dependence of FMR linewidth in Tb-doped Ni0.8Fe0.2 thin films

Published

May 15, 2002

Author(s)

Stephen E. Russek, Pavel Kabos, Robert McMichael, C G. Lee, William E. Bailey, R Ewasko, S. Sanders

Abstract

We present the dependence of the magnetostriction in Ni_0.8Fe_0.2 films on Tb and Gd doping concentration with the measured doping dependence of the high-frequency damping. While the magnetostriction and the high-frequency damping are correlated, the dependence is complicated. In particular, the high-frequency damping parameter α increases rapidly (α - 0.008-0.84) as the doping concentration si increased to 10%, whereas the increase in magnetostriction is similar to that observed in the Tb-doped films. Further, it is possible to achieve low magnetostriction (λ^s^-2×10⁶ near the region of critical damping. Measurements of th angular dependence of he ferromagnetic resonance linewidth in Tb-doped Ni_0.8Fe_0.2 films, although the linewidths are considerably larger. This is in contract to the systems such Ni_0.8Fe_0.2 on NiO, which have a large angular dependence indicating that the relaxation process proceeds through he generation of spin wave. The enhanced damping in the Tb-doped films appears, therefore, to be mediated through direct phonon generation.

Citation

Journal of Applied Physics

Volume

91

Issue

10

Pub Type

Journals

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Keywords

FMR, high-frequency damping, rare-earth doping, spin waves

Citation

Russek, S. , Kabos, P. , McMichael, R. , Lee, C. , Bailey, W. , Ewasko, R. and Sanders, S. (2002), Magnetostriction and angular dependence of FMR linewidth in Tb-doped Ni_0.8Fe_0.2 thin films, Journal of Applied Physics, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=30795 (Accessed October 6, 2025)