Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 27: Ultrafast Magnetization Effects I
MA 27.11: Vortrag
Mittwoch, 11. März 2026, 12:30–12:45, HSZ/0004
Element-specific magnetization dynamics of epitaxial ultrathin Co/Pt heterostructures — •Puloma Singh1, Corentin Aulagnet2, Thomas Jauk3, Sangeeta Sharma1,4, Martin Schultze3, Stéphane Mangin2, Clemens von Korff Schmising1, and Stefan Eisebitt1,5 — 1Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Berlin, Germany — 2Université de Lorraine, CNRS, Institut Jean Lamour, Nancy, France — 3Institut für Experimentalphysik, Technische Universität Graz, Graz, EU, Austria — 4Institute for Theoretical Solid-state Physics, Freie Universität Berlin, Berlin, Germany — 5Technische Universität Berlin, Institut für Optik und Atomare Physik, Berlin, Germany
Magnetic systems comprising 3d ferromagnetic transition metals and 4d/5d heavy metals are of interest because of their potential application in future energy storage technology. The microscopic process involved after femtosecond laser excitation is complex and is still controversially discussed in the existing literature. We present a systematic and element specific study of epitaxial, ultrathin Co films (0.8 and 1.0 nm) sandwiched by Pt layers. We compare the ultrafast response for the different Co thicknesses as well as for out-of-plane and in-plane magnetic anisotropy by a combination of pump-probe spectroscopy in the optical and extreme ultraviolet spectral range. Exploiting the Pt O2,3 and N7 and Co M2,3 resonances, we accurately disentangle the intrinsic and proximity induced magnetic moments of Co and Pt. We find consistently larger demagnetization amplitudes of the Pt magnetization compared to Co and a very pronounced thickness dependence.
Keywords: Ultrafast magnetization dynamics; Co/Pt heterostructure; XUV MOKE; pump-probe spectroscopy; element-specific