Influence of a static electric field on magnetic materials monitored by X-ray magnetic circular dichroism

0579216 - FZÚ 2024 RIV NL eng J - Článek v odborném periodiku
Ebert, H. - Mankovsky, S. - Marmodoro, Alberto - Simon, E.
Influence of a static electric field on magnetic materials monitored by X-ray magnetic circular dichroism.
Journal of Electron Spectroscopy and Related Phenomena. Roč. 268, Oct. (2023), č. článku 147386. ISSN 0368-2048. E-ISSN 1873-2526
Institucionální podpora: RVO:68378271
Klíčová slova: electric field * magnetism * X-ray absorption * spectroscopy * dichroism * Korringa-Kohn-Rostoker * KKR * green function
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 1.9, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1016/j.elspec.2023.147386

The magnetic circular X-ray dichroism (XMCD) in X-ray absorption spectroscopy (XAS) is used to monitor response of a magnetic system to an external perturbation. Application of a static external electric field may just lead to a charge rearrangement or to a steady electric current. The first situation can be handled with minor modifications of the standard well established schemes to calculate XAS and XMCD spectra. For the second case, more advanced schemes have to be used that account for the steady-state out-of-equilibrium situation. It is shown, that this can indeed be achieved by making use of the Keldysh non-equilibrium Green function formalism to express in particular the X-ray absorption coefficient in terms of the corresponding greater Green function. As an alternative approach, a bi-linear response formalism is presented that can be used to calculate the modification of the XMCD spectra due to the electric field directly.

Trvalý link: https://hdl.handle.net/11104/0348062