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Observation of magnetoelastic Gilbert damping in highly magnetostrictive Fe<sub>0.7</sub>Ga<sub>0.3</sub> thin films

ORAL

Abstract

Gilbert damping remains among the foremost properties when considering the design of spintronics devices. There are many cases where the observed damping is larger than the predicted damping, which is usually based on considerations of electronic structure (like the Kamberský torque-correlation model [1]). Here we report a large magnetoelastic contribution to the Gilbert damping in highly magnetostrictive Fe0.7Ga0.3 thin films, which grows to as large as 6 times greater than the intrinsic damping at 50 K. To show this, we present the orientational and temperature dependence of the Gilbert damping. The mechanism is suppressed for out-of-plane magnetization due to confinement effects from the interfaces of the film, leading to a large anisotropy. The damping for in-plane magnetization also increases significantly at low temperatures due to the increasing magnetoelastic energy. We conclude by emphasizing that, in general, the magnetoelastic damping may constitute a significant portion of the total Gilbert damping, particularly in materials with high magnetostriction.

[1] K. Gilmore et al., Phys. Rev. Lett. 99 027204 (2007)

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Presenters

  • William K. Peria

    University of Minnesota, School of Physics and Astronomy, University of Minnesota

Authors

  • William K. Peria

    University of Minnesota, School of Physics and Astronomy, University of Minnesota

  • Heshan Yu

    Department of Materials Science and Engineering, University of Maryland

  • Seunghun Lee

    Department of Physics, Pukyong National University, Department of Physics, Busan National University

  • Ichiro Takeuchi

    University of Maryland, College Park, Department of Materials Science, University of Maryland, Department of Materials Science and Engineering, University of Maryland

  • Paul A Crowell

    University of Minnesota, School of Physics and Astronomy, University of Minnesota