Analysis of x-ray magnetic circular dichroism in the half-metallic ferromagnet CrO2

被引：0

作者：

Ae, Toshiaki ^{[1
,2
]}

Nomura, Takuji ^{[1
,2
]}

机构：

[1] Univ Hyogo, Grad Sch Sci, Dept Mat Sci, 3-2-1 Kouto, Ako, Hyogo 6781297, Japan

[2] Natl Inst Quantum Sci & Technol, Synchrotron Radiat Res Ctr, SPring 8,1-1-1 Kouto, Sayo, Hyogo 6795148, Japan

来源：

PHYSICAL REVIEW B | 2024年 / 109卷 / 18期

关键词：

ELECTRONIC-STRUCTURE; BAND-STRUCTURE; SUM-RULES; ABSORPTION; POLARIZATION; SPECTROSCOPY; TRANSPORT; PROBE;

D O I：

10.1103/PhysRevB.109.184414

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a theoretical analysis of x-ray magnetic circular dichroism (XMCD) at the Cr- L edge in half-metallic ferromagnetic CrO 2 . First, since the XMCD spectrum is the difference between the x-ray absorption spectra (XAS) for right- and left-handed circularly polarized x rays, a general perturbative method of calculating XAS spectra is developed by means of the Keldysh Green's function technique for nonequilibrium states. Subsequently, it is applied to the analysis of XMCD of half-metallic ferromagnetic CrO 2 . Calculated XAS and XMCD spectra are compared with several previous experimental data. It is clearly shown that effects of the atomiclike Coulomb interaction between the 2 p and 3 d states are indispensable ingredients to yield good agreement with the experiments. Such strong 2 p -3 d correlation may originate from a peculiarity of the half-metallic ferromagnetic state. Evaluation of the validity of sum rules is made within our framework.

引用

页数：12

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