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MA: Fachverband Magnetismus

MA 40: Poster Magnetism II

MA 40.66: Poster

Donnerstag, 30. März 2023, 14:00–16:00, P2/EG

Towards shaping picosecond strain pulses via magnetostrictive transducers — Maximilian Mattern¹, Jan-Etienne Pudell^1,2,3, Karine Dumesnil⁴, •Alexander von Reppert¹, and Matias Bargheer^1,2 — ¹Institut für Physik und Astronomie, Universität 14476 Potsdam, Potsdam, Germany — ²Helmholtz-Zentrum Berlin, 12489 Berlin, Germany — ³European XFEL, 22869 Schenefeld, Germany — ⁴Institut Jean Lamour (UMR CNRS 7198), Université Lorraine, 54000 Nancy, France

Using time-resolved x-ray diffraction, we demonstrate the manipulation of the picosecond strain response of a metallic heterostructure consisting of a dysprosium (Dy) transducer and a niobium (Nb) detection layer by an external magnetic field. We utilize the first-order ferromagnetic-antiferromagnetic phase transition of the Dy layer, which provides an additional large contractive stress upon laser excitation compared to its zero-field response. This enhances the laser-induced contraction of the transducer and changes the shape of the picosecond strain pulses driven in Dy and detected within the buried Nb layer. Based on our experiment with rare-earth metals we discuss required properties for functional transducers, which may allow for novel field-control of the emitted picosecond strain pulses.