Berlin 2018 – scientific programme
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AKjDPG: Arbeitskreis junge DPG
AKjDPG 3: PhD Symposium: Ultrafast spin-lattice interactions (joint session MA/AKjDPG)
AKjDPG 3.2: Talk
Tuesday, March 13, 2018, 10:25–10:40, H 1012
Magnetic and Structural Dynamics in Antiferromagnetically Coupled Fe/Cr Superlattices — •Daniel Schick1,2, Daniel Bürgler3, Niko Pontius2, Stefan Eisebitt1, and Christian Schüßler-Langeheine2 — 1Max-Born-Institut für Nichlineare Optik und Kurzzeitspektroskopie, Max-Born-Str.2a, Berlin, 12489, Germany — 2Institut für Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein-Str. 15, Berlin, 12489, Germany — 3Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße 52428 Jülich, Germany
Employing the femtosecond soft X-ray pulses with variable polarization and photon energy delivered by the FemtoSpeX facility at the electron storage ring BESSY II we are able to probe the AFM (resonant magnetic diffraction), FM (XMCD), and structural (non-resonant diffraction) dynamics of Fe/Cr superlattices in one and the same pump-probe experiment. Hence, we can directly compare AFM vs. FM spin dynamics in the same material system by only applying a moderate magnetic field (< 100 mT). Moreover, we can probe the sub-ps structural dynamics due to coherent phonon excitation and its interaction with the spin system. The element selectivity of the resonant X-ray techniques further allows for differentiating the spin dynamics of the initially FM Fe and the non-magnetic Cr layers after photoexcitation and thus for probing possible transient magnetization in Cr due to ultrafast spin injection from the Fe layers.