Spin-wave Brillouin scattering in quasimonatomic Co films

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

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We have observed spin-wave Brillouin scattering in ultrathin Co/Au/Cu/Si(111) films with the Co thicknesses tCo down to one monolayer (ML). A graded Co-wedge sample with tCo=0-7 ML was prepared on 1 ML of Au interlayer by molecular beam epitaxy, where the thickness was calibrated by determining the number of deposited atoms using Rutherford backscattering spectroscopy. Observations of the spin-wave Brillouin excitation show directly collective and ferromagnetic ordering at room temperature. The tCo dependence of uniaxial perpendicular anisotropy is obtained from the field dependence of the spin-wave frequency. In addition, we quantify magnetic inhomogeneities from the field dependence of the spectrum width. With tCo≤2 ML, the perpendicular anisotropy shows a steep decrease with decreasing tCo, as well the structure-related magnetic inhomogeneity significantly increasing.

Original languageEnglish (US)
Pages (from-to)5051-5053
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II A
StatePublished - Apr 15 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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