Effect of an Au imderlayer on perpendicular magnetic anisotropy in An/Co/Au(111) sandwich films

Akihiro Murayama, Kyoko Hyomi, James Eickmann, Charles M. Falco

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We have used spin-wave Brillouin scattering to study perpendicular magnetic anisotropy in Au/Co/Au(111) sandwiched films with varying thicknesses of Au-underlayers. By using 5-monolayer (ML) -thick Co films, the transition of spin-wave frequency between out-of-plane and in-plane magnetizations can be observed by varying the in-plane field. We find that the field-dependence of the spin-wave energy is explained by a calculation including both the first-order (second power) and the second-order uniaxial perpendicular anisotropies depending on the Au-underlayer. We observe saturation of the anisotropy at 5 ML of Au-underlayer thickness, which corresponds to the saturation of in-plane lattice expansion of Co on that Au-undcrlayer. The contribution of interface anisotropy is evaluated from the Cothickness dependence of the anisotropy observed. We also have observed a field-dependent broadening of the spin-wave Brillouin spectra at a critical field between out-of-plane and inplane magnetizations, which we attribute to a distribution of the first-order anisotropy. -.

Original languageEnglish (US)
Pages (from-to)1198-1200
Number of pages3
JournalIEEE Transactions on Magnetics
Volume34
Issue number4 PART 1
DOIs
StatePublished - Dec 1 1998

Keywords

  • Au underlayer
  • Perpendicular anisotropy
  • Spin-wave Brillouin scattering
  • Ultrathin Co films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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