Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 27: Ultrafast Magnetization Effects I
MA 27.10: Talk
Wednesday, March 11, 2026, 12:15–12:30, HSZ/0004
Photoinduced demagnetization and carrier dynamics in SrRuO3 thin films probed by time resolved THz spectroscopy — •Ankhijur Islam Sekh1, Harun Mert Iyiisler1, Phillip Leiprecht2, Mathias Beck2, Paul Leiderer2, Gad Koren3, Ionela Lindfors-Vrejoiu4, Paul H.M. van Loosdrecht4, and Jure Demsar1 — 1JGU Mainz — 2University of Konstanz — 3Technion, Haifa — 4University of Cologne
SrRuO3 is an itinerant ferromagnet (Tc ≈ 150 K) whose T2 resistivity below 30K signals a ferromagnetic Fermi-liquid ground state. We present the temperature (T) and excitation fluence (F) dependent photoinduced conductivity dynamics of thin films grown by MBE and PLD, following excitation with fs near-infrared pulses. We show that photoinduced changes in THz conductivity are governed by the changes in the scattering rate of the intraband Drude response. The T- and F-dependent photoconductivity dynamics suggest that rapid carrier thermalization is accompanied by magnon generation, consistent with a high spin-flip scattering rate due to strong spin-orbit coupling. Accordingly, over a broad T and F-range, the photoconductivity transients track the evolution of the magnon population. At temperatures below 20K and at lowest F, we observe a delayed rise in photoconductivity, which reflects the reduced e-e thermalization rate with its characteristic Fermi-liquid T2 dependence.