Effects of conduction electron excitation on x-ray magnetic circularly polarized emission in itinerant ferromagnets
Effects of conduction electron excitation on x-ray magnetic circularly polarized emission in itinerant ferromagnets
复制标题
传导电子激发对流动铁磁体中 X 射线磁圆偏振发射的影响
DOI：
10.1103/physrevb.102.224425
复制
发表时间：
2020
影响因子：
3.7
通讯作者：
Inami Toshiya
中科院分区：
文献类型：
--
作者：
Koide Akihiro;Nomura Takuji;Inami Toshiya
我们开发了一种理论方法来计算流动铁磁体的 X 射线磁圆偏振发射 (XMCPE) 光谱，特别是过渡金属的发射。带内电子激发的影响通过凯尔迪什格林函数来处理。在我们的理论框架中，铁磁基态和激励分别通过平均场近似和单气泡图来描述。我们将我们的方法应用于金属铁的 XMCPE 光谱，并在每个峰的低能量侧重现观察到的尾部结构。带内激发的贡献很大程度上取决于交换相互作用以及电子之间的直接相互作用。光谱强度对相对于磁化方向的发射角的依赖性是余弦的，这表明 XMCPE 可用于研究块体铁磁体的磁化方向。
We develop a theoretical method to calculate x-ray magnetic circularly polarized emission (XMCPE) spectra for itinerant ferromagnets, in particular,emission for transition metals. The effects of electron excitations in thebands are treated by means of the Keldysh Green's function. In our theoretical framework, the ferromagnetic ground state and the excitations are described by a mean-field approximation and a single-bubble diagram, respectively. We apply our method toXMCPE spectra of metallic iron, and reproduce the observed tail structures on the low-energy side of each peak. Contributions from the excitations in thebands depend strongly on the exchange interaction as well as the direct interaction between theandelectrons. The dependence of the spectral intensity on emission angles with respect to the magnetization direction is cosinusoidal, indicating thatXMCPE can be used to investigate the magnetization directions in bulk ferromagnets.