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Near-unity spin Hall ratio in NixCu1-x alloys
NIST, Boulder, CO 80305 USA.
NIST, Boulder, CO 80305 USA;Penn State Univ, University Pk, PA 16802 USA.
NIST, Boulder, CO 80305 USA.
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 21, article id 214411Article in journal (Refereed) Published
Abstract [en]

We report a large spin Hall effect in the 3d transition metal alloy NixCu1-x for x is an element of {0.3, 0.75}, detected via the ferromagnetic resonance of a permalloy (Py = Ni80Fe20) film deposited in a bilayer with the alloy. A thickness series at x = 0.6, for which the alloy is paramagnetic at room temperature, allows us to determine the spin Hall ratio theta(SH) approximate to 1, spin diffusion length lambda(s), spin mixing conductance G(up arrow down arrow) and damping due to spin memory loss alpha(SML). We compare our results with similar experiments on Py/Pt bilayers measured using the same method. Ab initio band structure calculations with disorder and spin-orbit coupling suggest an intrinsic spin Hall effect in NixCu1-x alloys, although the experiments here cannot distinguish between extrinsic and intrinsic mechanisms.

Place, publisher, year, edition, pages
2019. Vol. 99, no 21, article id 214411
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-389599DOI: 10.1103/PhysRevB.99.214411ISI: 000470826300002OAI: oai:DiVA.org:uu-389599DiVA, id: diva2:1338707
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research eSSENCE - An eScience CollaborationStandUpAvailable from: 2019-07-24 Created: 2019-07-24 Last updated: 2019-07-24Bibliographically approved

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Delczeg-Czirjak, Erna Krisztina

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