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Magnetic Damping in Polycrystalline Thin-Film Fe-V Alloys
Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, United States.
Department of Physics and Astronomy, University Uppsala, Uppsala, Sweden.
Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, United States; Center for Memory and Recording Research, University of California-San Diego, San diego, United States.
Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder, United States.
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2021 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 15, no 5, article id 054031Article in journal (Refereed) Published
Abstract [en]

We report on the magnetic damping properties of polycrystalline Fe-V alloy thin films that are deposited at room temperature. By varying the concentration of V in the alloy, the saturation magnetization can be adjusted from that of Fe to near zero. We show that exceptionally low values of the damping parameter can be maintained over the majority of this range, with a minimum damping at approximately 15%-20% V concentration. Such a minimum is qualitatively reproduced with ab initio calculations of the damping parameter, although at a concentration closer to 10% V. The measured intrinsic damping has a minimum value of (1.53 +/- 0.08) x 10-3, which is approximately a factor of 3 higher than our calculated value of 0.48 x 10-3. From first-principles theory, we outline the factors that are mainly responsible for the trend of the damping parameter in these alloys. In particular, the band structure and resulting damping mechanism is shown to change at V concentrations greater than approximately 35% V content.

Place, publisher, year, edition, pages
American Physical Society, 2021. Vol. 15, no 5, article id 054031
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-92344DOI: 10.1103/PhysRevApplied.15.054031ISI: 000657674600002Scopus ID: 2-s2.0-85106274091OAI: oai:DiVA.org:oru-92344DiVA, id: diva2:1565425
Funder
Knut and Alice Wallenberg FoundationSwedish Research CouncilSwedish Foundation for Strategic Research Swedish Energy AgencyeSSENCE - An eScience CollaborationStandUp
Note

Funding Agencies:

United States Department of Energy (DOE) DE-SC0018237

European Research Council (ERC) European Commission

Available from: 2021-06-14 Created: 2021-06-14 Last updated: 2021-06-14Bibliographically approved

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Eriksson, Olle

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