Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams

Negi, Devendra Singh; Idrobo, Juan Carlos; Rusz, Ján

doi:10.1038/s41598-018-22234-8

Title: Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams

Journal Article · Mon Mar 05 00:00:00 EST 2018 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-018-22234-8· OSTI ID:1427589

Negi, Devendra Singh ^[1]; Idrobo, Juan Carlos ^[2];

^[1]

Uppsala Univ. (Sweden). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences

We report localization of a magnetic dichroic signal on atomic columns in electron magnetic circular dichroism (EMCD), probed by beam distorted by four-fold astigmatism and electron vortex beam. With astigmatic probe, magnetic signal to noise ratio can be enhanced by blocking the intensity from the central part of probe. However, the simulations show that for atomic resolution magnetic measurements, vortex beam is a more effective probe, with much higher magnetic signal to noise ratio. For all considered beam shapes, the optimal SNR constrains the signal detection at low collection angles of approximately 6–8 mrad. Irrespective of the material thickness, the magnetic signal remains strongly localized within the probed atomic column with vortex beam, whereas for astigmatic probes, the magnetic signal originates mostly from the nearest neighbor atomic columns. Due to excellent signal localization at probing individual atomic columns, vortex beams are predicted to be a strong candidate for studying the crystal site specific magnetic properties, magnetic properties at interfaces, or magnetism arising from individual atomic impurities.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Uppsala Univ. (Sweden)

Sponsoring Organization:: USDOE Office of Science (SC); Swedish Research Council (SRC); Goran Gustafsson’s Foundation (Sweden); Carl Tryggers Foundation (Sweden)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1427589

Journal Information:: Scientific Reports, Vol. 8; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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