Electronic structure of the (Nd1−xDyx)2Fe14B (0 ≤ x ≤ 1) system studied by X-ray photoelectron spectroscopy
Electronic structure of the (Nd1−xDyx)2Fe14B (0 ≤ x ≤ 1) system studied by X-ray photoelectron spectroscopy
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DOI：
10.1063/1.4931920
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发表时间：
2015-09
期刊：
影响因子：
1.6
通讯作者：
Jing Wang;Bin Yang;L. Liang;Li-min Sun;Lanting Zhang;S. Hirano
中科院分区：
文献类型：
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作者：
Jing Wang;Bin Yang;L. Liang;Li-min Sun;Lanting Zhang;S. Hirano
系统地表征了(Nd1−xDyx)2Fe14B体系的电子结构，特别是4f行为，提供了对磁性演化的物理本质的洞察。用X射线光电子能谱(XPS)、芯能级和价带能谱对其电子结构进行了研究。研究发现，在Nd2Fe14B中，Dy取代了Nd2Fe14B中的Nd2Fe14B，导致了电子结构演化的非线性变化。在富Nd区和富Dy区，只存在Nd4f态和Fe3d态之间的有限耦合。当Dy和Nd浓度接近相等时，Nd4f态和Fe3D态之间存在强耦合，导致它们之间存在成键状态。此外，(Nd1−xDyx)2Fe14B体系中的4f组分可归结为三个部分：1)Dy4f态的单独贡献，它在Dy取代后刚刚出现；2)Dy替代后的相互耦合的贡献。
Systematic characterization of electronic structures in the (Nd1−xDyx)2Fe14B system, especially the 4f behavior, provides an insight to the physical nature of the evolution of magnetic properties. A series of X-ray photoelectron spectroscopy (XPS) core-level and valence-band spectra were used to study the electronic structures. It was found that substitution of Dy for Nd in Nd2Fe14B results in a nonlinear variation in the evolution of electronic structures. Only the finite coupling between the Nd 4f states and the Fe 3d states is found at both the Nd-rich regime and the Dy-rich regime. When the Dy concentration and the Nd concentration approach to be equal, a strong coupling between the Nd 4f states and the Fe 3d states is found, which results in a bonding state between them. Additionally, the 4f components in the (Nd1−xDyx)2Fe14B system are ascribed to three parts: 1) the individual contribution of the Dy 4f states, which emerges just after the Dy-substitution; 2) the contribution of the coupling between...