Andersson C, Sanyal B, Eriksson O, Nordström L, Karis O, Arvanitis D, Konishi T, Holub-Krappe E, Dunn J Hunter
Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden.
Phys Rev Lett. 2007 Oct 26;99(17):177207. doi: 10.1103/PhysRevLett.99.177207. Epub 2007 Oct 24.
The spin and orbital moments of Au/Co/Au trilayers grown on a W(110) single crystal substrate have been investigated by means of x-ray magnetic circular dichroism. Our findings suggest that the orbital moment of Co does not obtain a maximum value along the easy axis, in contrast with previous experience. This is attributed to the large spin-orbit interaction within the Au caps. Both second order perturbation theory and first principles calculations show how the magnetocrystalline anisotropy (MCA) is dramatically influenced by this effect, and how this leads to the fact that the orbital moment anisotropy is not proportional to the MCA.
通过X射线磁圆二色性研究了生长在W(110)单晶衬底上的Au/Co/Au三层膜的自旋和轨道矩。我们的研究结果表明，与之前的经验相反，Co的轨道矩沿易轴并未获得最大值。这归因于Au帽层内较大的自旋-轨道相互作用。二阶微扰理论和第一性原理计算都表明了这种效应如何显著影响磁晶各向异性（MCA），以及这如何导致轨道矩各向异性与MCA不成正比的事实。
