Abstract
We investigated the ferromagnetic resonance of cobalt and iron films consisting of small islands deposited on a sapphire single crystal (Al 2O 3(0 0 0 1)) under UHV conditions. STM measurements performed on similar deposits on a thin alumina film (Al 2O 3/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 O 2 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.
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