Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.36: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Lattice response of TbFe2 thin films to ultrashort laser pulse excitation studied by X-Ray diffraction — •Steffen Zeuschner1, Azize Koc2, Jan-Etienne Pudell1, Karine Dumesnil3, Matthias Reinhardt2, Flavio Zamponi1, Marc Herzog1, Alexander von Reppert1, and Matias Bargheer1,2 — 1Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Helmholtz-Zentrum Berlin, Berlin, Germany — 3Institut Jean Lamour (UMR CNRS 7198), Université Lorraine, Nancy, France
We present ultrafast X-ray diffraction experiments that quantify the strain waves launched by femtosecond laser excitation. The spatio-temporal temperature and strain profiles suggest a non-linear fluence dependent non-equilibrium electronic heat transport on a picosecond timescale. TbFe2 is a model system known for its giant magnetostriction. Its two constituents Tb and Fe contribute a high crystalline anisotropy, a large effective magnetic moment and a Curie temperature considerably above room temperature. In line with the concept of heat assisted magnetic recording we observe that switching the magnetization by external magnetic fields is facilitated upon laser heating.