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  • 1.
    Thersleff, Thomas
    et al.
    Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.
    Schönström, Linus
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.
    Tai, Cheuk-Wai
    Stockholm Univ, Dept Mat & Environm Chem, S-10691 Stockholm, Sweden.
    Adam, Roman
    Forschungszentrum Julich GmbH, Peter Grunberg Inst, D-52425 Julich, Germany.
    Burgler, Daniel E.
    Forschungszentrum Julich GmbH, Peter Grunberg Inst, D-52425 Julich, Germany.
    Schneider, Claus M.
    Forschungszentrum Julich GmbH, Peter Grunberg Inst, D-52425 Julich, Germany.
    Muto, Shunsuke
    Nagoya Univ, Inst Mat & Syst Sustainabil, Nagoya, Aichi 4648603, Japan.
    Rusz, Jan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
    Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods2019In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 18170Article in journal (Refereed)
    Abstract [en]

    Measuring magnetic moments in ferromagnetic materials at atomic resolution is theoretically possible using the electron magnetic circular dichroism (EMCD) technique in a (scanning) transmission electron microscope ((S)TEM). However, experimental and data processing hurdles currently hamper the realization of this goal. Experimentally, the sample must be tilted to a zone-axis orientation, yielding a complex distribution of magnetic scattering intensity, and the same sample region must be scanned multiple times with sub-atomic spatial registration necessary at each pass. Furthermore, the weak nature of the EMCD signal requires advanced data processing techniques to reliably detect and quantify the result. In this manuscript, we detail our experimental and data processing progress towards achieving single-pass zone-axis EMCD using a patterned aperture. First, we provide a comprehensive data acquisition and analysis strategy for this and other EMCD experiments that should scale down to atomic resolution experiments. Second, we demonstrate that, at low spatial resolution, promising EMCD candidate signals can be extracted, and that these are sensitive to both crystallographic orientation and momentum transfer.

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