NDLI: Time-Resolved XUV Absorption Spectroscopy and Magnetic Circular Dichroism at the Ni $M_{2,3}$-Edges

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Time-Resolved XUV Absorption Spectroscopy and Magnetic Circular Dichroism at the Ni $M_{2,3}$-Edges

Content Provider	MDPI
Author	Benedikt, Rösner Florian, Döring Jan, Lüning Hennes, Marcel Chardonnet, Valentin Chiuzbaian, Gheorghe S. Delaunay, Renaud Guzenko, Vitaliy A. Hehn, Michel Jarrier, Romain Kleibert, Armin Lebugle, Maxime Malinowski, Gregory Merhe, Aladine Naumenko, Denys Nikolov, Ivaylo P. Lopez-Quintas, Ignacio Pedersoli, Emanuele Savchenko, Tatiana Watts, Benjamin Zangrando, Marco David, Christian Capotondi, Flavio Vodungbo, Boris Jal, Emmanuelle
Copyright Year	2020
Description	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.
Starting Page	325
e-ISSN	20763417
DOI	10.3390/app11010325
Journal	Applied Sciences
Issue Number	1
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2020-12-31
Access Restriction	Open
Subject Keyword	Applied Sciences Spectroscopy Ultrafast Spectroscopy Femtomagnetism Xuv-fel Magnetic Circular Dichroism
Content Type	Text
Resource Type	Article

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