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Atom size electron vortex beams with selectable orbital angular momentum
IFW Dresden, Inst Metall Mat, Helmholtzstr 20, D-01069 Dresden, Germany..
IFW Dresden, Inst Metall Mat, Helmholtzstr 20, D-01069 Dresden, Germany.;Tech Univ Dresden, Inst Solid State Phys, D-01062 Dresden, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-0074-1349
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, 934Article in journal (Refereed) Published
Abstract [en]

The decreasing size of modern functional magnetic materials and devices cause a steadily increasing demand for high resolution quantitative magnetic characterization. Transmission electron microscopy (TEM) based measurements of the electron energy-loss magnetic chiral dichroism (EMCD) may serve as the needed experimental tool. To this end, we present a reliable and robust electron-optical setup that generates and controls user-selectable single state electron vortex beams with defined orbital angular momenta. Our set-up is based on a standard high-resolution scanning TEM with probe aberration corrector, to which we added a vortex generating fork aperture and a miniaturized aperture for vortex selection. We demonstrate that atom size probes can be formed from these electron vortices and that they can be used for atomic resolution structural and spectroscopic imaging - both of which are prerequisites for future atomic EMCD investigations.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2017. Vol. 7, 934
National Category
Materials Engineering
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URN: urn:nbn:se:uu:diva-322175DOI: 10.1038/s41598-017-01077-9ISI: 000399534800002PubMedID: 28424470OAI: oai:DiVA.org:uu-322175DiVA: diva2:1096157
Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-17Bibliographically approved

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