Magnetic circular dichroism in hard x-ray Raman scattering as a probe of local spin polarization

Manabu Takahashi and Nozomu Hiraoka
Phys. Rev. B 100, 094435 – Published 20 September 2019

Abstract

We argue that the magnetic circular dichroism (MCD) of the hard x-ray Raman scattering (XRS) could be used as an element selective probe of local spin polarization. The magnitude of the XRS-MCD signal is directly proportional to the local spin polarization when the angle between the incident wave vector and the magnetization vector is 135 or 45. By comparing the experimental observation and the configuration interaction calculation at the L2,3 and M2,3 edges of ferromagnetic iron, we suggest that the integrated MCD signal in terms of the transferred energy could be used to estimate the local spin moment even in the case where the application of the spin sum rule in x-ray absorption is questionable. We also point out that the XRS-MCD signal could be observed at the M1 edge with a magnitude comparable to that at the M2,3 edge, although the spin-orbit coupling is absent in the core orbital. By combining the XRS-MCD at various edges, spin polarization distribution depending on the orbital magnetic quantum number would be determined.

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  • Received 5 August 2019

DOI:https://doi.org/10.1103/PhysRevB.100.094435

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Manabu Takahashi

  • Faculty of Engineering, Gunma University, Kiryu, Gunma 376, Japan

Nozomu Hiraoka

  • National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan

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Issue

Vol. 100, Iss. 9 — 1 September 2019

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