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Magneto-Optical Detection of the Spin Hall Effect in Pt and W Thin Films
Swiss Fed Inst Technol, Dept Mat, CH-8093 Zurich, Switzerland..
Swiss Fed Inst Technol, Dept Mat, CH-8093 Zurich, Switzerland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Swiss Fed Inst Technol, Dept Mat, CH-8093 Zurich, Switzerland..
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 8, 087203Article in journal (Refereed) Published
Abstract [en]

The conversion of charge currents into spin currents in nonmagnetic conductors is a hallmark manifestation of spin-orbit coupling that has important implications for spintronic devices. Here we report the measurement of the interfacial spin accumulation induced by the spin Hall effect in Pt and W thin films using magneto-optical Kerr microscopy. We show that the Kerr rotation has opposite sign in Pt and W and scales linearly with current density. By comparing the experimental results with ab initio calculations of the spin Hall and magneto-optical Kerr effects, we quantitatively determine the current-induced spin accumulation at the Pt interface as 5×10−12  μB A−1 cm2 per atom. From thickness-dependent measurements, we determine the spin diffusion length in a single Pt film to be 11±3  nm, which is significantly larger compared to that of Pt adjacent to a magnetic layer.

Place, publisher, year, edition, pages
2017. Vol. 119, no 8, 087203
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-333963DOI: 10.1103/PhysRevLett.119.087203ISI: 000408354800014OAI: oai:DiVA.org:uu-333963DiVA: diva2:1165393
Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2017-12-13Bibliographically approved

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Berritta, MarcoOppeneer, Peter M.

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