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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 Bargheer^1,2 — 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.