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Magnetoelastic Gilbert damping in magnetostrictive Fe0.7Ga0.3 thin films

W. K. Peria1, X. Wang2, H. Yu2, S. Lee2,3, I. Takeuchi2, and P. A. Crowell1,*

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
  • 2Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA
  • 3Department of Physics, Pukyong National University, Busan 48513, South Korea

  • *Author to whom correspondence should be addressed: crowell@umn.edu
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Phys. Rev. B 103, L220403 – Published 8 June, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L220403

Abstract

We report an enhanced magnetoelastic contribution to the Gilbert damping in highly magnetostrictive Fe0.7Ga0.3 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.

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Phys. Rev. B 103, L220403– Published 8 June, 2021
  • Received 12 March 2021
  • Revised 17 May 2021
  • Accepted 25 May 2021
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