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Detection of magnetic circular dichroism using a transmission electron microscope

Abstract

A material is said to exhibit dichroism if its photon absorption spectrum depends on the polarization of the incident radiation. In the case of X-ray magnetic circular dichroism (XMCD), the absorption cross-section of a ferromagnet or a paramagnet in a magnetic field changes when the helicity of a circularly polarized photon is reversed relative to the magnetization direction. Although similarities between X-ray absorption and electron energy-loss spectroscopy in a transmission electron microscope (TEM) have long been recognized, it has been assumed that extending such equivalence to circular dichroism would require the electron beam in the TEM to be spin-polarized. Recently, it was argued on theoretical grounds that this assumption is probably wrong1. Here we report the direct experimental detection of magnetic circular dichroism in a TEM. We compare our measurements of electron energy-loss magnetic chiral dichroism (EMCD) with XMCD spectra obtained from the same specimen that, together with theoretical calculations, show that chiral atomic transitions in a specimen are accessible with inelastic electron scattering under particular scattering conditions. This finding could have important consequences for the study of magnetism on the nanometre and subnanometre scales, as EMCD offers the potential for such spatial resolution down to the nanometre scale while providing depth information—in contrast to X-ray methods, which are mainly surface-sensitive.

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Figure 1: Scattering geometry.
Figure 2: X-ray magnetic circular dichroism.
Figure 3: Energy-loss magnetic chiral dichroism.

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Acknowledgements

We thank E. Bauer and S. Buehler-Paschen for discussions. This work was supported by the European Union under the project CHIRALTEM. Author Contributions P.S. and C.H. had the idea to do this experiment and developed the principles; P.S. wrote the manuscript; S.R. performed the experiment on the TEM and adapted the EMCD program; J.R. was the principal developer of the EMCD program; J.K. helped substantially in debugging the EMCD program; P.N. generalized two programs contained in the WIEN2k package that were used in the EMCD program and helped in its debugging and implementation; E.C. produced and characterized the TEM substrates; M.F. grew the iron films and ran XMCD and magneto-optic Kerr effect experiments; G.P. and G.R. coordinated the work at the synchrotron and the XMCD data analysis. All authors discussed the results and contributed to the manuscript.

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This file contains Supplementary Discussion, Supplementary Figures 1–3 and Supplementary Equations. This file also contains additional references. (PDF 280 kb)

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Schattschneider, P., Rubino, S., Hébert, C. et al. Detection of magnetic circular dichroism using a transmission electron microscope. Nature 441, 486–488 (2006). https://doi.org/10.1038/nature04778

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