Element-specific magnetic moments from core-absorption magnetic circular dichroism of the doped Heusler alloy Co2Cr0.6Fe0.4Al -: art. no. 104412
Element-specific magnetic moments from core-absorption magnetic circular dichroism of the doped Heusler alloy Co2Cr0.6Fe0.4Al -: art. no. 104412
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DOI：
10.1103/physrevb.67.104412
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发表时间：
2003-03-01
影响因子：
3.7
通讯作者：
Cramm, S
中科院分区：
文献类型：
--
作者：
Elmers, HJ;Fecher, GH;Cramm, S
测量了Co2Cr0.6Fe0.4Al铁磁性Heusler合金Co2Cr0.6Fe0.4Al在Co，Fe，Cr L-II，L-III边缘的芯级吸收(x射线吸收谱)的软x射线谱的磁性圆二色谱.对比抛光表面原位清洗前后的XAS光谱，发现空气中的铬发生了明显的选择性氧化。对于清洁的表面，我们观察到所有三种元素的MCD，其中Fe显示每个原子的最大力矩。MCD可以用线性松饼-TiN轨道原子球近似所预测的3D空态的态密度来解释。对于Fe和Cr，磁矩的轨道角动量分量比报道的金属合金的值要大得多，而对于Co，观察到接近其体积值的值。通过与能带结构计算的比较，讨论了这一观测结果。
The magnetic circular dichroism (MCD) of core-level absorption (x-ray absorption spectroscopy, XAS) spectra in the soft x-ray region has been measured for the ferromagnetic Heusler alloy Co2Cr0.6Fe0.4Al at the Co, Fe, and Cr L-II,L-III edges. The comparison of XAS spectra before and after in situ cleaning of polished surfaces revealed a pronounced selective oxidation of Cr in air. For clean surfaces we observed a MCD for all three elements with Fe showing the largest moment per atom. The MCD can be explained by the density of states of the 3d unoccupied states, predicted by linear muffin-tin orbital atomic sphere approximation. For Fe and Cr the orbital angular momentum component of the magnetic moment is considerably larger than the values reported for metallic alloys, whereas for Co a value close to its bulk value is observed. This observation is discussed in comparison with band structure calculations.