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Temperature-dependent Gilbert damping of Co2FeAl thin films with different degree of atomic order
KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0001-6509-5782
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 22, article id 224425Article in journal (Refereed) Published
Abstract [en]

Half-metallicity and low magnetic damping are perpetually sought for spintronics materials, and full Heusler compounds in this respect provide outstanding properties. However, it is challenging to obtain the well-ordered half-metallic phase in as-deposited full Heusler compound thin films, and theory has struggled to establish a fundamental understanding of the temperature-dependent Gilbert damping in these systems. Here we present a study of the temperature-dependent Gilbert damping of differently ordered as-deposited Co2FeAl full Heusler compound thin films. The sum of inter-and intraband electron scattering in conjunction with the finite electron lifetime in Bloch states governs the Gilbert damping for the well-ordered phase, in contrast to the damping of partially ordered and disordered phases which is governed by interband electronic scattering alone. These results, especially the ultralow room-temperature intrinsic damping observed for the well-ordered phase, provide fundamental insights into the physical origin of the Gilbert damping in full Heusler compound thin films.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 22, article id 224425
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Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-220823DOI: 10.1103/PhysRevB.96.224425ISI: 000418572700007Scopus ID: 2-s2.0-85039444027OAI: oai:DiVA.org:kth-220823DiVA, id: diva2:1173056
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QC 20180111

Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-03-07Bibliographically approved

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Pan, FanBergqvist, Lars

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CiteExportLink to record
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