Magneto-optical spectroscopy of dilute magnetic semiconductors Public Deposited

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  • March 21, 2019
  • Harley, Eric Chad Toppin
    • Affiliation: College of Arts and Sciences, Department of Physics and Astronomy
  • Dilute magnetic semiconductors (DMS) are a class of semiconductors where a magnetic ion has been randomly but substitutionally doped into a conventional semiconductor. DMS are currently envisioned as a key ferromagnetic material to be used in the construction of spintronic devices, or devices which operate based on the spin of spin-polarized charge carriers. I report primarily on magnetic characterization of Ga1-xMnxAs, and additionally on structural characterization of Ga1-xMnxN, examples of (III,Mn)V DMS. Magnetic Raman scattering experiments performed on Ga1-xMnxN were unsuccessful. Results from magnetic Brillouin light scattering (BLS) measurements of Ga1-xMnxAs include the angular- and field-dependence of magnon (spin-wave) frequencies and the resulting description of magnetocrystalline anisotropy; dependence of magnon frequency on Mn content, temperature, and incident laser power; and the observation of surface magnon modes. Transverse magneto-optical Kerr effect (t-MOKE) measurements provide an additional perspective on magnetocrystalline anisotropy and serve to completely eliminate the possibility of a description in terms of the Stoner-Wohlfarth single-domain model.
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  • McNeil, Laurie
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