Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams
Abstract
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.
- Authors:
-
[1]
- Uppsala Univ. (Sweden). Dept. of Physics and Astronomy
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Uppsala Univ. (Sweden)
- Sponsoring Org.:
- USDOE Office of Science (SC); Swedish Research Council (SRC); Goran Gustafsson’s Foundation (Sweden); Carl Tryggers Foundation (Sweden)
- OSTI Identifier:
- 1427589
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 8; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; magnetic properties and materials; matter waves and particle beams
Citation Formats
Negi, Devendra Singh, Idrobo, Juan Carlos, and Rusz, Ján. Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams. United States: N. p., 2018.
Web. doi:10.1038/s41598-018-22234-8.
Negi, Devendra Singh, Idrobo, Juan Carlos, & Rusz, Ján. Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams. United States. https://doi.org/10.1038/s41598-018-22234-8
Negi, Devendra Singh, Idrobo, Juan Carlos, and Rusz, Ján. Mon .
"Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams". United States. https://doi.org/10.1038/s41598-018-22234-8. https://www.osti.gov/servlets/purl/1427589.
@article{osti_1427589,
title = {Probing the localization of magnetic dichroism by atomic-size astigmatic and vortex electron beams},
author = {Negi, Devendra Singh and Idrobo, Juan Carlos and Rusz, Ján},
abstractNote = {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.},
doi = {10.1038/s41598-018-22234-8},
journal = {Scientific Reports},
number = ,
volume = 8,
place = {United States},
year = {Mon Mar 05 00:00:00 EST 2018},
month = {Mon Mar 05 00:00:00 EST 2018}
}
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Works referencing / citing this record:
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