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Abstract:
We investigated the ferromagnetic resonance of cobalt and iron films consisting of small islands deposited on a sapphire single crystal (Al2O3(0 0 0 1)) under UHV conditions. STM measurements performed on similar deposits on a thin alumina film (Al2O3/NiAl(1 1 0)) revealed a three-dimensional growth mode. On the basis of these structural data we investigated the magnetic anistotropy via angular-dependent ferromagnetic resonance measurements. Cobalt islands exhibit a uniaxial out-of-plane anisotropy which alignes the magnetization parallel to the substrate. This in-plane magnetization is due to the demagnetizing field which is calculated as the dipole sum atom by atom. Furthermore, the influence of adsorbates like O2 or CO on the magnetism of thin films was investigated revealing a partial reduction in intensity. The adsorbates only influence the outer atoms and a magnetic core still remains.
