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Spin pumping in ion-beam sputtered Co2FeAl/Mo bilayers: Interfacial Gilbert damping
Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 6, article id 064420Article in journal (Refereed) Published
Abstract [en]

The spin-pumping mechanism and associated interfacial Gilbert damping are demonstrated in ion-beam sputtered Co2FeAl (CFA)/Mo bilayer thin films employing ferromagnetic resonance spectroscopy. The dependence of the net spin-current transportation on Mo layer thickness, 0 to 10 nm, and the enhancement of the net effective Gilbert damping are reported. The experimental data have been analyzed using spin-pumping theory in terms of spin current pumped through the ferromagnet/nonmagnetic metal interface to deduce the real spin-mixing conductance and the spin-diffusion length, which are estimated to be 1.56(±0.30)×1019m−2 and 2.61(±0.15)nm, respectively. The damping constant is found to be 8.8(±0.2)×10−3 in the Mo(3.5 nm)-capped CFA(8 nm) sample corresponding to an ∼69% enhancement of the original Gilbert damping 5.2(±0.6)×10−3 in the Al-capped CFA thin film. This is further confirmed by inserting the Cu dusting layer which reduces the spin transport across the CFA/Mo interface. The Mo layer thickness-dependent net spin-current density is found to lie in the range of 1−4MAm−2, which also provides additional quantitative evidence of spin pumping in this bilayer thin-film system.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 97, no 6, article id 064420
Keywords [en]
Spintronics, Spin Pumping, Ferromagnetic Resonance
National Category
Condensed Matter Physics Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-343110DOI: 10.1103/PhysRevB.97.064420ISI: 000426015100004OAI: oai:DiVA.org:uu-343110DiVA, id: diva2:1185512
Funder
Knut and Alice Wallenberg Foundation, KAW 2012.0031Available from: 2018-02-25 Created: 2018-02-25 Last updated: 2018-04-26Bibliographically approved

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Publisher's full texthttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.97.064420

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Kumar, AnkitBehera, NilamaniAkansel, SerkanSvedlindh, Peter

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