Understanding electron magnetic circular dichroism in a transition potential approach

J. Barthel, J. Mayer, J. Rusz, P.-L. Ho, X. Y. Zhong, M. Lentzen, R. E. Dunin-Borkowski, K. W. Urban, H. G. Brown, S. D. Findlay, and L. J. Allen
Phys. Rev. B 97, 144103 – Published 5 April 2018

Abstract

This paper introduces an approach based on transition potentials for inelastic scattering to understand the underlying physics of electron magnetic circular dichroism (EMCD). The transition potentials are sufficiently localized to permit atomic-scale EMCD. Two-beam and three-beam systematic row cases are discussed in detail in terms of transition potentials for conventional transmission electron microscopy, and the basic symmetries which arise in the three-beam case are confirmed experimentally. Atomic-scale EMCD in scanning transmission electron microscopy (STEM), using both a standard STEM probe and vortex beams, is discussed.

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  • Received 29 November 2017
  • Revised 27 February 2018

DOI:https://doi.org/10.1103/PhysRevB.97.144103

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

J. Barthel and J. Mayer

  • Central Facility for Electron Microscopy, RWTH Aachen University, 52074 Aachen, Germany and Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, 52425 Jülich, Germany

J. Rusz

  • Department of Physics and Materials Science, Uppsala University, Box 530, S-751 21 Uppsala, Sweden

P.-L. Ho

  • Beijing National Center for Electron Microscopy, Laboratory of Advanced Materials, The State Key Laboratory of New Ceramics and Fine Processing, and School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China and Central Facility for Electron Microscopy, RWTH Aachen University, 52074 Aachen, Germany

X. Y. Zhong

  • Beijing National Center for Electron Microscopy, Laboratory of Advanced Materials, The State Key Laboratory of New Ceramics and Fine Processing, and School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

M. Lentzen, R. E. Dunin-Borkowski, and K. W. Urban

  • Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany

H. G. Brown and S. D. Findlay

  • School of Physics and Astronomy, Monash University, Clayton, Victoria 3800, Australia

L. J. Allen*

  • School of Physics, University of Melbourne, Parkville, Victoria 3010, Australia and Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich, 52425 Jülich, Germany

  • *lja@unimelb.edu.au

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Issue

Vol. 97, Iss. 14 — 1 April 2018

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