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Finite-temperature interatomic exchange and magnon softening in Fe overlayers on Ir(001)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Fed Univ Para, Fac Fis, Belem, Para, Brazil..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Fed Univ Para, Fac Fis, Belem, Para, Brazil..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2016 (English)In: PHYSICAL REVIEW B, ISSN 2469-9950, Vol. 94, no 1, 014413Article in journal (Refereed) PublishedText
Abstract [en]

We evaluate how thermal effects soften the magnon dispersion in 6 layers of Fe(001) on top of Ir(001). We perform a systematic study considering noncollinear spin arrangement and calculate configuration-dependent exchange parameters J(ij)(nc) following the methodology described by Szilva et al. [Phys. Rev. Lett. 111, 127204 (2013)]. In addition, Monte Carlo simulations were performed in order to estimate the noncollinear spin arrangement as a function of temperature. Hence the J(ij)(nc)'s related to these configurations were calculated and used in an atomistic spin dynamics approach to evaluate the magnon spectra. Our results show good agreement with recent room-temperature measurements, and highlights how thermal effects produce magnon softening in this, and similar, systems.

Place, publisher, year, edition, pages
2016. Vol. 94, no 1, 014413
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-300459DOI: 10.1103/PhysRevB.94.014413ISI: 000379497400007OAI: oai:DiVA.org:uu-300459DiVA: diva2:951490
Funder
Swedish Research Council, 2013.0020; 2012.0031
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2016-08-09Bibliographically approved

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Rodrigues, Debora C. M.Szilva, AttilaBergman, AndersEriksson, Olle
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Materials Theory
Condensed Matter Physics

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