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Magneto-optical properties of Au upon the injection of hot spin-polarized electrons across Fe/Au(001) interfaces
CNRS, Inst Mol & Mat Le Mans, UMR 6283, F-72085 Le Mans, France.
CNRS, Inst Mol & Mat Le Mans, UMR 6283, F-72085 Le Mans, France;Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Univ Duisburg Essen, Fac Chem, Univ Str 5, D-45141 Essen, Germany.
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2019 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 31, no 12, article id 124002Article in journal (Refereed) Published
Abstract [en]

We demonstrate a novel method for the excitation of sizable magneto-optical effects in Au by means of the laser-induced injection of hot spin-polarized electrons in Au/Fe/MgO(001) heterostructures. It is based on the energy- and spin-dependent electron transmittance of Fe/Au interface which acts as a spin filter for non-thermalized electrons optically excited in Fe. We show that after crossing the interface, majority electrons propagate through the Au layer with the velocity on the order of 1 nm fs(-1) (close to the Fermi velocity) and the decay length on the order of 100nm. Featuring ultrafast functionality and requiring no strong external magnetic fields, spin injection results in a distinct magneto-optical response of Au. We develop a formalism based on the phase of the transient complex MOKE response and demonstrate its robustness in a plethora of experimental and theoretical MOKE studies on Au, including our ab initio calculations. Our work introduces a flexible tool to manipulate magneto-optical properties of metals on the femtosecond timescale that holds high potential for active magneto-photonics, plasmonics, and spintronics.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 31, no 12, article id 124002
Keywords [en]
spin current, time-resolved MOKE, nonlinear magneto-optical spectroscopy, Drude model
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-377198DOI: 10.1088/1361-648X/aafd06ISI: 000457442600001PubMedID: 30625433OAI: oai:DiVA.org:uu-377198DiVA, id: diva2:1291622
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2015.0060EU, Horizon 2020, 737709Available from: 2019-02-25 Created: 2019-02-25 Last updated: 2019-02-25Bibliographically approved

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Berritta, MarcoOppeneer, Peter M.

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