High Frequency FMR spectroscopy of Thin MnAs Epilayers grown on (111) and (100) GaAs

ORAL

Abstract

The magnetic anisotropies of thin ferromagnetic epilayers can be conveniently studied by ferromagnetic resonance spectroscopy [1] with 9 or 35 GHz spectrometers. The case of $\alpha$-MnAs -- a metallic ferromagnet of interest for hybrid semiconductor spintronics -- presents technical challenges because the large structure-related anisotropy field limits such measurements to close to easy axis orientation. We have overcome this difficulty by applying high frequency FMR at 115 GHz with magnetic fields up to 11 T. This allows us to map out complete angular variation patterns and to thus deduce the corresponding anisotropy constants. We report on a systematic investigation of the influence of epilayer thickness and temperature on the magnetic anisotropy.\\[4pt] [1] Kh.Khazen et al, Phys.Rev.B {bf 77}, 165204 (2008).

*This work was supported by ONR-MURI and NSF.

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Authors

  • M. Cubukcu

    • Institute of Nanosciences de Paris, Universit\'e Paris 6 and UMR 7588 au CNRS, Paris, France

  • H.J. von Bardeleben

    • Institute of Nanosciences de Paris, Universit\'e Paris 6 and UMR 7588 au CNRS, Paris, France

  • J.L. Cantin

    • Institute of Nanosciences de Paris, Universit\'e Paris 6 and UMR 7588 au CNRS, Paris, France

  • M.J. Wilson

    • Dept. of Physics, Penn State University, University Park.
    • Dept. of Physics, Penn State University, University Park PA 16802

  • D. Rench

    • Dept. of Physics, Penn State University, University Park PA 16802

  • Peter Schiffer

    • The Pennsylvania State University
    • Dept. of Physics, Penn State University, University Park PA 16802
    • Pennsylvania State University

  • Nitin Samarth

    • Dept. of Physics, Penn State University, University Park PA 16802
    • Center for Nanoscale Science and Materials Research Institute, Penn State University, University Park PA 16802
    • Dept. of Physics, Penn State University, University Park.
    • Materials Research Institute, Penn State University, University Park, Pennsylvania 16802
    • The Pennsylvania State University