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 language||English (US)|
|Number of pages||3|
|Journal||Journal of Applied Physics|
|Issue number||8 II A|
|State||Published - Apr 15 1999|
ASJC Scopus subject areas
- Physics and Astronomy(all)