Abstract
Brillouin Light Scattering (BLS) measurements have been performed upon epitaxial Fe/GaAs(100) and Fe/GaAs( 1 10) films with particular emphasis on Fe thicknesses less than 100 Å. A continuum theory that is required to describe the experimental data is presented. The values of the magnetic anisotropy fields measured by BLS agree well with those obtained from detailed Magneto Optical Kerr Effect (MOKE) studies. An in-plane uniaxial anisotropy is observed in addition to the cubic anisotropy for both the (100) and ( 1 10) orientations. For Fe/GaAs(100), both the cubic anisotropy field and the effective demagnetizing field increase with film thickness while the uniaxial anisotropy field decreases with film thickness. For Fe/GaAs( 1 10) the uniaxial anisotropy field changes sign as the thickness is increased. In light of these findings we discuss how the Fe/GaAs interface may influence the values of the magnetization and anisotropy constants in the Fe films.
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