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Speed and efficiency of femtosecond spin current injection into a nonmagnetic material
Univ Kaiserslautern, Erwin Schroedinger Str 46, D-67663 Kaiserslautern, Germany.;Grad Sch Mat Sci Mainz, Staudinger Weg 9, D-55128 Mainz, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Univ Kaiserslautern, Erwin Schroedinger Str 46, D-67663 Kaiserslautern, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 10, 100403Article in journal (Refereed) Published
Abstract [en]

We investigate femtosecond spin injection from an optically excited Ni top layer into an Au bottom layer using time-resolved complex magneto-optical Kerr effect (C-MOKE) measurements. Employing the C-MOKE formalism, we are able to follow layer-resolved demagnetization in Ni and the simultaneous spin injection into the adjacent Au film, both occurring within similar to 40 fs. We confirm the ballistic to diffusive propagation of the spin transfer process with ab initio theory and superdiffusive transport calculations. In particular, our combined experimental-theoretical effort does allow us to quantify the so far elusive amount of spin injection, and therefore the spin injection efficiency at the interface.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 10, 100403
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-336051DOI: 10.1103/PhysRevB.96.100403ISI: 000410861200001OAI: oai:DiVA.org:uu-336051DiVA: diva2:1164817
Funder
Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)Knut and Alice Wallenberg Foundation, 2015.0060
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-12Bibliographically approved

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Maldonado, PabloBerritta, MarcoOppeneer, Peter M.

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