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Magnetic damping in sputter-deposited Co2MnGe Heusler compounds with A2, B2, and L2(1) orders: Experiment and theory
Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder CO, United States.
Department of Physics and Astronomy, University Uppsala, Uppsala, Sweden.
Quantum Electromagnetics Division, National Institute of Standards and Technology, Boulder CO, United States.
Department of Physics and Astronomy, University Uppsala, Uppsala, Sweden.
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 9, article id 094420Article in journal (Refereed) Published
Abstract [en]

We show that very low values of the magnetic damping parameter can be achieved in sputter deposited polycrystalline films of Co2MnGe annealed at relatively low temperatures ranging from 240 degrees C to 400 degrees C. Damping values as low as 0.0014 are obtained with an intrinsic value of 0.0010 after spin-pumping contributions are considered. Of importance to most applications is the low value of inhomogeneous linewidth that yields measured linewidths of 1.8 and 5.1 mT at 10 and 40 GHz, respectively. The damping parameter monotonically decreases as the B2 order of the films increases. This trend is reproduced and explained by ab initio calculations of the electronic structure and damping parameter. Here, the damping parameter is calculated as the structure evolves from A2 to B2 to L2(1) orders. The largest decrease in the damping parameter occurs during the A2 to B2 transition as the half-metallic phase becomes established.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 9, article id 094420
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-66385DOI: 10.1103/PhysRevB.97.094420ISI: 000427798500002Scopus ID: 2-s2.0-85044408058OAI: oai:DiVA.org:oru-66385DiVA, id: diva2:1196251
Funder
Knut and Alice Wallenberg Foundation, 2012.0031 2013.0030Swedish Research Council, 2016-04524 2016-06955 2013-08316
Note

Funding Agencies:

STandUP  

eSSENCE  

IARPA Cryogenic Computing Complexity program 

Available from: 2018-04-09 Created: 2018-04-09 Last updated: 2018-04-09Bibliographically approved

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Eriksson, Olle

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