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Reciprocal and real space maps for EMCD experiments

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    0357422 - FZU-D 2011 RIV NL eng J - Journal Article
    Lidbaum, H. - Rusz, Ján - Rubino, S. - Liebig, A. - Hjörvarsson, B. - Oppeneer, P.M. - Eriksson, A. - Leifer, K.
    Reciprocal and real space maps for EMCD experiments.
    Ultramicroscopy. Roč. 110, č. 11 (2010), s. 1380-1389 ISSN 0304-3991
    Institutional research plan: CEZ:AV0Z10100520
    Keywords : magnetic circular dichroism * electron energy-loss spectra * transmission electron microscopy
    Subject RIV: BM - Solid Matter Physics ; Magnetism
    Impact factor: 2.061, year: 2010

    Electron magnetic chiral dichroism (EMCD) is an emerging tool for quantitative measurements of magnetic properties using the transmission electron microscope (TEM), with the possibility of nanometer resolution. The geometrical conditions, data treatment and electron gun settings are found to influence the EMCD signal. In this article, particular care is taken to obtain a reliable quantitative measurement of the ratio of orbital to spin magnetic moment using energy filtered diffraction patterns. We describe a method for data treatment, normalization and selection of mirror axis. The experimental results are supported by theoretical simulations based on dynamical diffraction and density functional theory. Using special settings, we demonstrate the principle of acquiring real space maps of the EMCD signal. This enables advanced characterization of magnetic materials with superior spatial resolution.
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