Spin-wave Brillouin scattering in quasimonatomic Co films
- Optical Sciences Center and Surface Science Division of Arizona Research Laboratories, University of Arizona, Tucson, Arizona 85721 (United States)
We have observed spin-wave Brillouin scattering in ultrathin Co/Au/Cu/Si(111) films with the Co thicknesses t{sub Co} down to one monolayer (ML). A graded Co-wedge sample with t{sub Co}=0{endash}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 t{sub Co} 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 t{sub Co}{le}2;ML, the perpendicular anisotropy shows a steep decrease with decreasing t{sub Co}, as well the structure-related magnetic inhomogeneity significantly increasing. {copyright} {ital 1999 American Institute of Physics.}
- OSTI ID:
- 347048
- Journal Information:
- Journal of Applied Physics, Vol. 85, Issue 8; Other Information: PBD: Apr 1999
- Country of Publication:
- United States
- Language:
- English
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