Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków, Poland.
Phys Rev Lett. 2010 Jul 16;105(3):037202. doi: 10.1103/PhysRevLett.105.037202. Epub 2010 Jul 13.
A large enhancement of the x-ray magnetic circular dichroism is observed at the iron K absorption preedge of magnetite. This is achieved by performing resonant inelastic x-ray scattering (RIXS) experiments with a 2p hole in the final state of the second-order optical process. We measured and calculated the full 1s2p RIXS planes for opposite helicities of the incoming circularly polarized x rays. The crystal field multiplet calculations show that the enhancement arises from 2p-3d Coulomb repulsions and 2p and 3d spin-orbit coupling. The observed magnitude of the RIXS magnetic circular dichroism effect is ∼16%. This opens up new opportunities for a broad range of research fields allowing for truly bulk-sensitive, element-, and site-selective measurements of 3d transition metal magnetic moments and their ordering using hard x-ray photons.
在磁铁矿的铁 K 吸收预边处观察到 X 射线磁圆二色性的大幅增强。这是通过在二阶光学过程的终态中具有 2p 空穴来进行共振非弹性 X 射线散射 (RIXS) 实验来实现的。我们测量并计算了入射圆偏振 X 射线相反螺旋的完整 1s2p RIXS 平面。晶体场多重态计算表明，增强来自 2p-3d 库仑排斥以及 2p 和 3d 自旋轨道耦合。观察到的 RIXS 磁圆二色性效应的幅度约为 16%。这为广泛的研究领域开辟了新的机会，使用硬 X 射线光子可以对 3d 过渡金属磁矩及其有序进行真正的体敏感、元素和位置选择性测量。
