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Structure, spin-dynamics, and magnetic properties of annealed nanoscaled Fe layers on GaAs



Justin Shaw, Charles M. Falco


We performed a detailed study of the effect of annealing (at temperatures up to 300°C) on 0.2-3.0 nm thick epitaxial Fe layers deposited on GaAs(001). Using Brillouin light scattering, we studied the magnetic properties and spin dynamics of these layers and find a strong correlation between magnetic properties and the structure and chemical properties, as measured with electron diffraction, scanning tunneling microscopy, and x-ray photoemission spectroscopy. We found that significant changes in crystallinity and microstructure occur with annealing. Specifically, annealing of the thinnest layers results in the formation of a discontinuous magnetic layer with increased crystal order. At slightly larger thicknesses, faceted pits form in the Fe layer. This change in structure results in an earlier transition to a ferromagnetic phase, the creation of an additional higher frequency spin-wave mode, and a reduction in the magnetic uniaxial anisotropy constant.
Journal of Applied Physics


epitaxy, magnetic, spin-dynamics


Shaw, J. and Falco, C. (2007), Structure, spin-dynamics, and magnetic properties of annealed nanoscaled Fe layers on GaAs, Journal of Applied Physics, [online], (Accessed June 18, 2024)


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Created February 1, 2007, Updated October 12, 2021