Journal article
Understanding electron magnetic circular dichroism in a transition potential approach
J Barthel, J Mayer, J Rusz, PL Ho, XY Zhong, M Lentzen, RE Dunin-Borkowski, KW Urban, HG Brown, SD Findlay, LJ Allen
Physical Review B | AMER PHYSICAL SOC | Published : 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.
Grants
Awarded by Tsinghua University
Funding Acknowledgements
This work made use of the resources of the National Center for Electron Microscopy in Beijing. P.-L.H. and X.Y.Z. acknowledge financial support from the National Key Research and Development Program (2016YFB0700402), the National Natural Science Foundation of China (51761135131), and the RWTH Aachen University - Tsinghua University Junior Research Fellowship scheme, and also acknowledge helpful input from Z. Q. Wang, J. Zhu, R. Yu, Z. Y. Cheng, S. P. Crane, R. Ramash, and Q. Zhan. This research was supported under the Australian Research Council's Discovery Projects funding scheme (Project DP140102538). L.J.A. acknowledges support by the Alexander von Humboldt Foundation.