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|Author(s):||Justin M. Shaw; Charles M. Falco;|
|Title:||Structure, spin-dynamics, and magnetic properties of annealed nanoscaled Fe layers on GaAs|
|Published:||February 02, 2007|
|Abstract:||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.|
|Citation:||Journal of Applied Physics|
|Pages:||pp. 033905-1 - 033905-6|
|PDF version:||Click here to retrieve PDF version of paper (429KB)|