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  A shortcut to gradient-corrected magnon dispersion: exchange-only case

Eich, F. G., Pittalis, S., & Vignale, G. (2018). A shortcut to gradient-corrected magnon dispersion: exchange-only case. European Physical Journal B, 91(8): 173. doi:10.1140/epjb/e2018-90253-y.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-EE39-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-EE3A-3
Genre: Journal Article

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Eich2018_Article_AShortcutToGradient-correctedM.pdf (Publisher version), 564KB
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Eich2018_Article_AShortcutToGradient-correctedM.pdf
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This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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2018
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https://dx.doi.org/10.1140/epjb/e2018-90253-y (Publisher version)
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 Creators:
Eich, F. G.1, Author              
Pittalis, S.2, Author
Vignale, G.3, Author
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2stituto Nanoscienze, Consiglio Nazionale delle Ricerch, ou_persistent22              
3Department of Physics and Astronomy, University of Missouri, Columbia, ou_persistent22              

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 Abstract: Ab initio calculations of the magnon dispersion in ferromagnetic materials typically rely on the adiabatic local density approximation (ALDA) in which the effective exchange-correlation field is everywhere parallel to the magnetization. These calculations, however, tend to overestimate the “magnon stiffness”, defined as the curvature of the magnon frequency vs. wave vector relation evaluated at zero wave vector. Here we suggest a simple procedure to improve the magnon dispersion by taking into account gradient corrections to the ALDA at the exchange-only level. We find that this gradient correction always reduces the magnon stiffness. The surprisingly large size of these corrections (~30%) greatly improves the agreement between the calculated and the observed magnon stiffness for cobalt and nickel, which are known to be overestimated within the ALDA.

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Language(s): eng - English
 Dates: 2018-05-222018-04-132018-08-012018-08-01
 Publication Status: Published in print
 Pages: -
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 Rev. Method: Peer
 Identifiers: DOI: 10.1140/epjb/e2018-90253-y
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Project name : F.G.E. has received funding from the European Union’s Framework Programme for Research and Innovation Horizon 2020 (2014–2020) under the Marie Sk lodowska-Curie Grant Agreement No. 701796. GV was supported by the Grant No. DE-FG02-05ER46203 funded by the U.S. Department of Energy, Office of Science. Open access funding provided by Max Planck Society.
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Title: European Physical Journal B
  Other : Eur. Phys. J. B
Source Genre: Journal
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Publ. Info: Heidelberg : Springer-Verlag Heidelberg
Pages: - Volume / Issue: 91 (8) Sequence Number: 173 Start / End Page: - Identifier: ISSN: 1434-6028
CoNE: /journals/resource/954927001233