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Tensor description of X-ray magnetic dichroism at the Fe L2,3-edges of Fe3O4

DOI: 10.1107/S1600577520015027 DOI Help

Authors: Hebatalla Elnaggar (Utrecht University) , Maurits W. Haverkort (Heidelberg University) , Mai Hussein Hamed (Forschungszentrum Juelich GmbH; Helwan University) , Sarnjeet S. Dhesi (Diamond Light Source) , Frank M. F. De Groot (Utrecht University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 28

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 17588

Open Access Open Access

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.

Journal Keywords: X-ray absorption spectroscopy; magnetic dichroism; fundamental spectra; tensor analysis.

Subject Areas: Physics, Materials, Technique Development

Instruments: I06-Nanoscience


Discipline Tags:

Material Sciences Physics Electronics Magnetism Nanoscience/Nanotechnology Surfaces interfaces and thin films Technique Development - Physics

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)