TY - JOUR
T1 - Time-resolved xuv absorption spectroscopy and magnetic circular dichroism at the Ni M2,3-edges
AU - Hennes, Marcel
AU - Rösner, Benedikt
AU - Chardonnet, Valentin
AU - Chiuzbaian, Gheorghe S.
AU - Delaunay, Renaud
AU - Döring, Florian
AU - Guzenko, Vitaliy A.
AU - Hehn, Michel
AU - Jarrier, Romain
AU - Kleibert, Armin
AU - Lebugle, Maxime
AU - Lüning, Jan
AU - Malinowski, Gregory
AU - Merhe, Aladine
AU - Naumenko, Denys
AU - Nikolov, Ivaylo P.
AU - Lopez-Quintas, Ignacio
AU - Pedersoli, Emanuele
AU - Savchenko, Tatiana
AU - Watts, Benjamin
AU - Zangrando, Marco
AU - David, Christian
AU - Capotondi, Flavio
AU - Vodungbo, Boris
AU - Jal, Emmanuelle
PY - 2021/1/1
Y1 - 2021/1/1
N2 - 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.
AB - 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.
KW - Femtomagnetism
KW - Magnetic circular dichroism
KW - Ultrafast spectroscopy
KW - XUV-FEL
UR - http://www.scopus.com/inward/record.url?scp=85098974279&partnerID=8YFLogxK
U2 - 10.3390/app11010325
DO - 10.3390/app11010325
M3 - Article
AN - SCOPUS:85098974279
VL - 11
SP - 1
EP - 11
JO - Applied Sciences
JF - Applied Sciences
IS - 1
M1 - 325
ER -