Lau J T, Föhlisch A, Nietubyc R, Reif M, Wurth W
Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, D-22761 Hamburg, Germany.
Phys Rev Lett. 2002 Jul 29;89(5):057201. doi: 10.1103/PhysRevLett.89.057201. Epub 2002 Jul 15.
The size-dependent magnetic properties of small iron clusters deposited on ultrathin nickel films have been studied with circularly polarized synchrotron radiation. With the use of sum rules, orbital and spin magnetic moments have been extracted from x-ray magnetic circular dichroism spectra. The ratio of orbital to spin magnetic moments varies considerably with cluster size, reflecting the dependence of magnetic properties on cluster size and geometry. These variations can be explained in terms of enhanced orbital moments in small clusters.
利用圆偏振同步辐射研究了沉积在超薄镍膜上的小铁团簇的尺寸依赖性磁性能。通过求和规则，从X射线磁圆二色性光谱中提取了轨道磁矩和自旋磁矩。轨道磁矩与自旋磁矩的比值随团簇尺寸变化很大，反映了磁性能对团簇尺寸和几何形状的依赖性。这些变化可以用小团簇中增强的轨道矩来解释。
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