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

Justin M. Shaw, Charles M. Falco

Research output: Contribution to journalArticle

8 Scopus citations

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 found 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.

Original languageEnglish (US)
Article number033905
JournalJournal of Applied Physics
Volume101
Issue number3
DOIs
StatePublished - Feb 26 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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