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Layer-resolved magnetic exchange interactions of surfaces of late 3d elements: Effects of electronic correlations
KTH, Skolan för informations- och kommunikationsteknik (ICT), Material- och nanofysik, Materialfysik, MF. Uppsala University, Sweden.ORCID-id: 0000-0001-7788-6127
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2015 (Engelska)Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 92, nr 16, artikel-id 165129Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present the results of an ab initio study of the magnetic properties of Fe, Co, and Ni surfaces. In particular, we discuss their electronic structure and magnetic exchange interactions (J(ij)), as obtained bymeans of a combination of density functional theory and dynamical mean-field theory. All studied systems have a pronounced tendency to ferromagnetism both for bulk and surface atoms. The presence of narrowband surface states is shown to enhance the magnetic moment as well as the exchange couplings. The most interesting results were obtained for the Fe surface where the atoms have a tendency to couple antiferromagnetically with each other. This interaction is relatively small when compared to interlayer ferromagnetic interaction, and it depends strongly on the lattice parameter. Local correlation effects are shown to lead to strong changes of the overall shape of the spectral functions. However, they seem not to play a decisive role in the overall picture of magnetic couplings studied here. We have also investigated the influence of correlations on the spin and orbital moments of bulklike and surface atoms. We found that dynamical correlations in general lead to enhanced values of the orbital moment.

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American Physical Society , 2015. Vol. 92, nr 16, artikel-id 165129
Nyckelord [en]
Mean-Field Theory, 1st-Principles Calculations, Orbital Magnetism, Transition-Metals, Ni(001) Surface, Nickel Metal, Spin-Waves, Systems, Fe, Co
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Fysik
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URN: urn:nbn:se:kth:diva-177052DOI: 10.1103/PhysRevB.92.165129ISI: 000363524200003Scopus ID: 2-s2.0-84946811906OAI: oai:DiVA.org:kth-177052DiVA, id: diva2:883395
Forskningsfinansiär
VetenskapsrådetEnergimyndighetenKnut och Alice Wallenbergs StiftelseSwedish e‐Science Research CenterStiftelsen för strategisk forskning (SSF)EU, Europeiska forskningsrådet, 338957 FEMTO/NANO
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QC 20151217

QC 20151218

Tillgänglig från: 2015-12-17 Skapad: 2015-11-13 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Delin, Anna

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