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Transport theory for femtosecond laser-induced spin-transfer torques
Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Ke Karlovu 5, CZ-12116 Prague, Czech Republic..
Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Ke Karlovu 5, CZ-12116 Prague, Czech Republic..
Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Ke Karlovu 5, CZ-12116 Prague, Czech Republic..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2018 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 30, no 11, article id 115801Article in journal (Refereed) Published
Abstract [en]

Ultrafast demagnetization of magnetic layers pumped by a femtosecond laser pulse is accompanied by a nonthermal spin-polarized current of hot electrons. These spin currents are studied here theoretically in a spin valve with noncollinear magnetizations. To this end, we introduce an extended model of superdiffusive spin transport that enables the treatment of noncollinear magnetic configurations, and apply it to the perpendicular spin valve geometry. We show how spin-transfer torques arise due to this mechanism and calculate their action on the magnetization present, as well as how the latter depends on the thicknesses of the layers and other transport parameters. We demonstrate that there exists a certain optimum thickness of the out-of-plane magnetized spin-current polarizer such that the torque acting on the second magnetic layer is maximal. Moreover, we study the magnetization dynamics excited by the superdiffusive spin-transfer torque due to the flow of hot electrons employing the Landau-Lifshitz-Gilbert equation. Thereby we show that a femtosecond laser pulse applied to one magnetic layer can excite small-angle precessions of the magnetization in the second magnetic layer. We compare our calculations with recent experimental results.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2018. Vol. 30, no 11, article id 115801
Keywords [en]
ultrafast demagnetization, spin transfer torque, magnetization dynamics, spin current, spin transport
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-350487DOI: 10.1088/1361-648X/aaad95ISI: 000425996100001OAI: oai:DiVA.org:uu-350487DiVA, id: diva2:1206480
Funder
Swedish National Infrastructure for Computing (SNIC)Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)EU, Horizon 2020, 737709Knut and Alice Wallenberg Foundation, 2015.0060Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved

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Maldonado, PabloOppeneer, Peter M.

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