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Ultrafast demagnetization of Pt magnetic moment in L1(0)-FePt probed by magnetic circular dichroism at a hard x-ray free electron laser
Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan;Univ Tokyo, Dept Phys, Tokyo 1130033, Japan;Inst Mol Sci, Okazaki, Aichi 4448585, Japan.
Japan Synchrotron Radiat Res Inst, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan;RIKEN, SPring 8 Ctr, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan.
Japan Synchrotron Radiat Res Inst, 1-1-1 Kouto, Sayo, Hyogo 6795198, Japan.
Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan;Univ Tokyo, Dept Phys, Tokyo 1130033, Japan;Natl Def Acad Japan, Yokosuka, Kanagawa 2398686, Japan.
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2019 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 21, no 12, article id 123010Article in journal (Refereed) Published
Abstract [en]

Unraveling the origin of ultrafast demagnetization in multisublattice ferromagnetic materials requires femtosecond x-ray techniques to trace the magnetic moment dynamics on individual elements, but this could not yet be achieved in the hard x-ray regime. We demonstrate here the first ultrafast demagnetization dynamics in the ferromagnetic heavy 5d-transition metal Pt using circularly-polarized hard x-rays at an x-ray free electron laser (XFEL). The decay time of laser-induced demagnetization of L1(0)-FePt is determined to be tau(Pt) = 0.61 +/- 0.04 ps using time-resolved x-ray magnetic circular dichroism at the Pt L-3 edge, whereas magneto-optical Kerr measurements indicate the decay time for the total magnetization as tau(total) < 0.1 ps. A transient magnetic state with a photomodulated ratio of the 3d and 5d magnetic moments is demonstrated for pump-probe delays larger than 1 ps. We explain this distinct photo-modulated transient magnetic state by the induced-moment behavior of the Pt atom and the x-ray probing depth. Our findings pave the way for the future use of XFELs to disentangle atomic spin dynamics contributions.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2019. Vol. 21, no 12, article id 123010
Keywords [en]
photo-induced magnetization dynamics, time-resolved XMCD, XFEL
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-407454DOI: 10.1088/1367-2630/ab5ac2ISI: 000513663400009OAI: oai:DiVA.org:uu-407454DiVA, id: diva2:1417132
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2015.0060Available from: 2020-03-26 Created: 2020-03-26 Last updated: 2020-03-26Bibliographically approved

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Berritta, MarcoOppeneer, Peter M.

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3940414243444542 of 459
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