Ultrafast behavior of induced and intrinsic magnetic moments in CoFeB/Pt bilayers probed by element-specific measurements in the extreme ultraviolet spectral range
In: ISSN: 2643-1564, 2023
academicJournal
Zugriff:
International audience ; The ultrafast and element-specific response of magnetic systems containing ferromagnetic 3d transition metals and 4d/5d heavy metals is of interest both from a fundamental as well as an applied research perspec-tive. However, to date no consensus about the main microscopic processes describing the interplay between intrinsic 3d and induced 4d/5d magnetic moments upon femtosecond laser excitation exist. In this work we study the ultrafast response of CoFeB/Pt bilayers by probing element-specific, core-to-valence-band transitions in the extreme ultraviolet spectral range using high harmonic radiation. We show that the combination of magnetic scattering simulations and analysis of the energy-and time-dependent magnetic asymmetries allows us to accurately disentangle the element-specific response in spite of overlapping Co and Fe M2,3 as well as Pt O2,3 and N7 resonances. We find a considerably smaller demagnetization time constant as well as much larger demagnetization amplitudes of the induced moment of Pt compared to the intrinsic moment of CoFeB. Our results are in agreement with enhanced spin-flip probabilities due to the high spin-orbit coupling localized at the heavy metal Pt, as well as with the recently formulated hypothesis that a laser-generated, incoherent magnon population within the ferromagnetic film leads to an overproportional reduction of the induced magnetic moment of Pt.
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Ultrafast behavior of induced and intrinsic magnetic moments in CoFeB/Pt bilayers probed by element-specific measurements in the extreme ultraviolet spectral range
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Autor/in / Beteiligte Person: | von Korff Schmising, Clemens ; Jana, Somnath ; Yao, Kelvin ; Hennecke, Martin ; Scheid, Philippe ; Sharma, Sangeeta ; Viret, Michel ; Chauleau, Jean-Yves ; Schick, Daniel ; Eisebitt, Stefan ; Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI) ; CEA- Saclay (CEA) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA) ; Service de physique de l'état condensé (SPEC - UMR3680) ; Institut Rayonnement Matière de Saclay (DRF) (IRAMIS) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire Nano-Magnétisme et Oxydes (LNO) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (DRF) (IRAMIS) ; Technical University of Berlin / Technische Universität Berlin (TU) |
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Zeitschrift: | ISSN: 2643-1564, 2023 |
Veröffentlichung: | HAL CCSD ; American Physical Society, 2023 |
Medientyp: | academicJournal |
DOI: | 10.1103/PhysRevResearch.5.013147 |
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