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Element-selective investigation of femtosecond spin dynamics in NiPd magnetic alloys using extreme ultraviolet radiation
Res Ctr Julich, Peter Grunberg Inst PGI 6, D-52425 Julich, Germany..
Res Ctr Julich, Peter Grunberg Inst PGI 6, D-52425 Julich, Germany..
Res Ctr Julich, Peter Grunberg Inst PGI 6, D-52425 Julich, Germany..
Res Ctr Julich, Peter Grunberg Inst PGI 6, D-52425 Julich, Germany..
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2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 97, no 6, article id 064412Article in journal (Refereed) Published
Abstract [en]

We studied femtosecond spin dynamics in NixPd1-x magnetic thin films by optically pumping the system with infrared (1.55 eV) laser pulses and subsequently recording the reflectivity of extreme ultraviolet (XUV) pulses synchronized with the pump pulse train. XUV light in the energy range from 20 to 72 eV was produced by laser high-harmonic generation. The reflectivity of XUV radiation at characteristic resonant energies allowed separate detection of the spin dynamics in the elemental subsystems at the M-2,M-3 absorption edges of Ni (68.0 and 66.2 eV) and N-2,N-3 edges of Pd (55.7 and 50.9 eV). The measurements were performed in transversal magneto-optical Kerr effect geometry. In static measurements, we observed a magnetic signature of the Pd subsystem due to an induced magnetization. Calculated magneto-optical asymmetries based on density functional theory show close agreement with the measured results. Femtosecond spin dynamics measured at the Ni absorption edges indicates that increasing the Pd concentration, which causes a decrease in the Curie temperature T-C, results in a drop of the demagnetization time tau(M), contrary to the tau(M) similar to 1/T-C scaling expected for single-species materials. This observation is ascribed to the increase of the Pd-mediated spin-orbit coupling in the alloy.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 97, no 6, article id 064412
National Category
Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-349353DOI: 10.1103/PhysRevB.97.064412ISI: 000425492100005OAI: oai:DiVA.org:uu-349353DiVA, id: diva2:1202871
Funder
German Research Foundation (DFG), SCHN 353/17-1Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2015.0060Swedish National Infrastructure for Computing (SNIC)Available from: 2018-05-02 Created: 2018-05-02 Last updated: 2018-05-02Bibliographically approved

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Rusz, JanMaldonado, PabloOppeneer, Peter M.

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