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Single-pass STEM-EMCD on a zone axis using a patterned aperture: progress in experimental and data treatment methods
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Uppsala University, Sweden.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 18170Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2019. Vol. 9, article id 18170
Keywords [en]
EELS, EMCD, TEM, STEM, Magnetism
National Category
Condensed Matter Physics Nano Technology
Research subject
Materials Science
Identifiers
URN: urn:nbn:se:su:diva-177290DOI: 10.1038/s41598-019-53373-1ISI: 000500806400001OAI: oai:DiVA.org:su-177290DiVA, id: diva2:1381310
Funder
Swedish Research Council, 2016-05113Available from: 2019-12-20 Created: 2019-12-20 Last updated: 2020-01-07Bibliographically approved

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Thersleff, ThomasSchönström, LinusTai, Cheuk-Wai
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