Magnetoelastic Gilbert damping in magnetostrictive Fe$_{0.7}$Ga$_{0.3}$ thin films

William K. Peria; Xinjun Wang; Heshan Yu; Seunghun Lee; Ichiro Takeuchi; Paul A. Crowell

doi:10.1103/PhysRevB.103.L220403

Magnetoelastic Gilbert damping in magnetostrictive Fe$_{0.7}$Ga$_{0.3}$ thin films

Materials Science 2021-06-16 v1

Authors: William K. Peria , Xinjun Wang , Heshan Yu , Seunghun Lee , Ichiro Takeuchi , Paul A. Crowell

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Abstract

We report an enhanced magnetoelastic contribution to the Gilbert damping in highly magnetostrictive Fe $_{0.7}$ Ga $_{0.3}$ thin films. This effect is mitigated for perpendicular-to-plane fields, leading to a large anisotropy of the Gilbert damping in all of the films (up to a factor of 10 at room temperature). These claims are supported by broadband measurements of the ferromagnetic resonance linewidths over a range of temperatures (5 to 400 K), which serve to elucidate the effect of both the magnetostriction and phonon relaxation on the magnetoelastic Gilbert damping.

Keywords

magnetoelastic gilbert damping magnetostrictive thin films fega ferromagnetic resonance phonon relaxation damping anisotropy

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@article{arxiv.2103.07008,
  title  = {Magnetoelastic Gilbert damping in magnetostrictive Fe$_{0.7}$Ga$_{0.3}$ thin films},
  author = {William K. Peria and Xinjun Wang and Heshan Yu and Seunghun Lee and Ichiro Takeuchi and Paul A. Crowell},
  journal= {arXiv preprint arXiv:2103.07008},
  year   = {2021}
}

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13 pages, 12 figures

Magnetoelastic Gilbert damping in magnetostrictive Fe$_{0.7}$Ga$_{0.3}$ thin films

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