Tensor description of X-ray magnetic dichroism at the Fe L 2,3-edges of Fe3O4

Hebatalla Elnaggar*, Maurits W. Haverkort, Mai Hussein Hamed, Sarnjeet S. Dhesi, Frank M.F. De Groot

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A procedure to build the optical conductivity tensor that describes the full magneto-optical response of the system from experimental measurements is presented. Applied to the Fe L2,3-edge of a 38.85 nm Fe3O4/SrTiO3 (001) thin-film, it is shown that the computed polarization dependence using the conductivity tensor is in excellent agreement with that experimentally measured. Furthermore, the magnetic field angular dependence is discussed using a set of fundamental spectra expanded on spherical harmonics. It is shown that the convergence of this expansion depends on the details of the ground state of the system in question and in particular on the valence-state spin-orbit coupling. While a cubic expansion up to the third order explains the angular-dependent X-ray magnetic linear dichroism of Fe3+ well, higher-order terms are required for Fe2+ when the orbital moment is not quenched.

Original languageEnglish
Pages (from-to)247-258
Number of pages12
JournalJournal of Synchrotron Radiation
Volume28
DOIs
Publication statusPublished - Jan 2021

Keywords

  • fundamental spectra
  • magnetic dichroism
  • tensor analysis
  • X-ray absorption spectroscopy

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