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Enhanced Gilbert damping in Re-doped FeCo films: Combined experimental and theoretical study
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Seagate Technol, Londonderry BT48 0BF, North Ireland.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 17, article id 174408Article in journal (Refereed) Published
Abstract [en]

The effects of rhenium doping in the range 0-10 at.% on the static and dynamic magnetic properties of Fe65Co35 thin films have been studied experimentally as well as with first-principles electronic structure calculations focusing on the change of the saturation magnetization (M-s) and the Gilbert damping parameter (alpha). Both experimental and theoretical results show that M-s decreases with increasing Re-doping level, while at the same time alpha increases. The experimental low temperature saturation magnetic induction exhibits a 29% decrease, from 2.31 to 1.64 T, in the investigated doping concentration range, which is more than predicted by the theoretical calculations. The room temperature value of the damping parameter obtained from ferromagnetic resonance measurements, correcting for extrinsic contributions to the damping, is for the undoped sample 2.1 x 10(-3), which is close to the theoretically calculated Gilbert damping parameter. With 10 at.% Re doping, the damping parameter increases to 7.8 x 10(-3), which is in good agreement with the theoretical value of 7.3 x 10(-3). The increase in damping parameter with Re doping is explained by the increase in the density of states at the Fermi level, mostly contributed by the spin-up channel of Re. Moreover, both experimental and theoretical values for the damping parameter weakly decrease with decreasing temperature.

Place, publisher, year, edition, pages
2019. Vol. 99, no 17, article id 174408
National Category
Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-387290DOI: 10.1103/PhysRevB.99.174408ISI: 000467722100005OAI: oai:DiVA.org:uu-387290DiVA, id: diva2:1329090
Funder
Knut and Alice Wallenberg Foundation, KAW 2012.0031Swedish Research Council, 2016-05366Available from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-06-24Bibliographically approved

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Akansel, SerkanKumar, AnkitEsteban-Puyuelo, RaquelBanerjee, RudraAutieri, CarmineBrucas, RimantasBehera, NilamaniSortica, Mauricio A.Primetzhofer, DanielSanyal, BiplabSvedlindh, Peter
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