Time-Resolved XUV Absorption Spectroscopy and Magnetic Circular Dichroism at the Ni M 2,3 -Edges
| Autor: | Boris Vodungbo, Benjamin Watts, Marco Zangrando, Denys Naumenko, Gregory Malinowski, Emanuele Pedersoli, Armin Kleibert, Romain Jarrier, Flavio Capotondi, Gheorghe S. Chiuzbaian, Tatiana Savchenko, Michel Hehn, Christian David, Ignacio Lopez-Quintas, Emmanuelle Jal, Valentin Chardonnet, Jan Lüning, Benedikt Rösner, Marcel Hennes, Renaud Delaunay, Ivaylo Nikolov, Florian Döring, Aladine Merhe, Maxime Lebugle, Vitaliy A. Guzenko |
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| Přispěvatelé: | Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Paul Scherrer Institute (PSI), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Elettra Sincrotrone Trieste |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Photon Absorption spectroscopy FOS: Physical sciences 02 engineering and technology Electron 01 natural sciences Molecular physics lcsh:Technology lcsh:Chemistry ultrafast spectroscopy symbols.namesake 0103 physical sciences [CHIM]Chemical Sciences General Materials Science 010306 general physics Spin (physics) Absorption (electromagnetic radiation) Instrumentation lcsh:QH301-705.5 Fluid Flow and Transfer Processes [PHYS]Physics [physics] Condensed Matter - Materials Science femtomagnetism XUV FEL magnetic circular dichroism XUV-FEL Magnetic circular dichroism lcsh:T Process Chemistry and Technology Fermi level General Engineering Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology lcsh:QC1-999 Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 lcsh:TA1-2040 Femtosecond symbols 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:Physics |
| Zdroj: | Applied Sciences Applied Sciences, MDPI, 2020, 11 (1), pp.325. ⟨10.3390/app11010325⟩ Volume 11 Issue 1 Applied Sciences, Vol 11, Iss 325, p 325 (2021) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app11010325⟩ |
| Popis: | Ultrashort optical pulses can trigger a variety of non-equilibrium processes in magnetic thin films affecting electrons and spins on femtosecond timescales. In order to probe the charge and magnetic degrees of freedom simultaneously, we developed an X-ray streaking technique that has the advantage of providing a jitter-free picture of absorption cross-section changes. In this paper, we present an experiment based on this approach, which we performed using five photon probing energies at the Ni M2,3-edges. This allowed us to retrieve the absorption and magnetic circular dichroism time traces, yielding detailed information on transient modifications of electron and spin populations close to the Fermi level. Our findings suggest that the observed absorption and magnetic circular dichroism dynamics both depend on the extreme ultraviolet (XUV) probing wavelength, and can be described, at least qualitatively, by assuming ultrafast energy shifts of the electronic and magnetic elemental absorption resonances, as reported in recent work. However, our analysis also hints at more complex changes, highlighting the need for further experimental and theoretical studies in order to gain a thorough understanding of the interplay of electronic and spin degrees of freedom in optically excited magnetic thin films. |
| Databáze: | OpenAIRE |
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