Berlin 2018 – wissenschaftliches Programm
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AKjDPG: Arbeitskreis junge DPG
AKjDPG 3: PhD Symposium: Ultrafast spin-lattice interactions (joint session MA/AKjDPG)
AKjDPG 3.5: Vortrag
Dienstag, 13. März 2018, 11:55–12:10, H 1012
Structural dynamics during laser-induced ultrafast demagnetization — •Emmanuelle Jal1, Victor Lopez-Flores2,3, Niko Pontius4, Tom Ferte5, Christine Boeglin5, Boris Vodungbo1, Jan Lüning1,2, and Nicolas Jaouen2 — 1Sorbonne Universités, UPMC Univ. Paris 06, CNRS, LCPMR, 75005 Paris, FRANCE — 2Synchrotron SOLEIL, Saint-Aubin, Boite Postale 48, 91192 Gif-sur-Yvette Cedex, FRANCE — 3CSIC - University of Seville, Av. Americo Vespucio, 49, 41092 Seville, SPAIN — 4HZB für Materialien und Energie GmbH, Albert-Einstein-Straße 15, 12489 Berlin, GERMANY — 5Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, FRANCE
I will present our investigation of the infrared laser-pulse-induced ultrafast demagnetization process in a thin Ni film, which characterizes simultaneously magnetization and structural dynamics [PRB 95 184422]. This is achieved by employing femtosecond timeresolved x-ray resonant magnetic reflectivity (tr-XRMR) as the probe technique. The experimental results reveal unambiguously that the subpicosecond magnetization quenching is accompanied by strong changes in nonmagnetic x-ray reflectivity. These changes vary with reflection angle, and changes up to 30% have been observed. By modeling the x-ray reflectivity of the investigated thin film, we can reproduce these changes by a variation of the apparent Ni layer thickness of up to 1%. Extending these simulations to larger incidence angles, we show that tr-XRMR can be employed to discriminate experimentally between currently discussed models describing the ultrafast demagnetization phenomenon.