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Scattering of electron vortex beams on a magnetic crystal: Towards atomic-resolution magnetic measurements
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.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 13, 134428- p.Article in journal (Refereed) Published
Abstract [en]

Use of electron vortex beams (EVB), that is, convergent electron beams carrying an orbital angular momentum (OAM), is a novel development in the field of transmission electron microscopy. They should allow measurement of element-specific magnetic properties of thin crystals using electron magnetic circular dichroism (EMCD)-a phenomenon similar to the x-ray magnetic circular dichroism. Recently, it has been shown computationally that EVBs can detect magnetic signal in a scanning mode only at atomic resolution. In this follow-up work, we explore in detail the elastic and inelastic scattering properties of EVBs on crystals, as a function of beam diameter, initial OAM, acceleration voltage, and beam displacement from an atomic column. We suggest that for a 10-nm layer of bcc iron oriented along (001) zone axis, an optimal configuration for a detection of EMCD is an EVB with OAM of 1 (h) over bar and a full width at half maximum diffraction-limited beam diameter of 1.6 angstrom, acceleration voltage 200 kV, and an annular detector with inner and outer radii of 7 and 44 mrad, respectively.

Place, publisher, year, edition, pages
2014. Vol. 89, no 13, 134428- p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-227279DOI: 10.1103/PhysRevB.89.134428ISI: 000335791000002OAI: oai:DiVA.org:uu-227279DiVA: diva2:730835
Available from: 2014-06-30 Created: 2014-06-24 Last updated: 2017-12-05Bibliographically approved

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Rusz, Jan

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