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Dresden 2020 – scientific programme

The DPG Spring Meeting in Dresden had to be cancelled! Read more ...

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MA: Fachverband Magnetismus

MA 42: Posters Magnetism I

MA 42.28: Poster

Wednesday, March 18, 2020, 15:00–18:00, P3

Time resolved magnetostriction in itinerant ferromagnet SrRuO3Maximilian Mattern1, •Jan-Etienne Pudell1, Alexander von Reppert1, Marc Herzog1, and Matias Bargheer1,21Institut für Physik und Astronomie, Universität Potsdam, Potsdam, Germany — 2Helmholtz-Zentrum Berlin, Berlin, Germany

We present ultrafast x-ray diffraction (UXRD) measurements of the ferromagnet SrRuO3 using 200 femtosecond x-ray pulses derived from a laser based plasma x-ray source. Optical excitation of a 20 nm SrRuO3 layer by femtosecond laser pulses instantaneously heats up the electron gas. In the paramagnetic phase the deposited energy couples to the phonons and leads to a lattice expansion. In the ferromagnetic phase a part of the deposited energy is transferred to the spin degrees of freedom. This results in a reduced lattice expansion in the ferromagnetic phase due to a pronounced magnetostriction. In the ferromagnetic phase of SrRuO3 the energy transferred from the electrons to the spin system leads to a lattice contraction, whereas heating the phonon system leads to expansion. We model the generated lattice dynamics after laser excitation and analyze the saturation of the spin excitation upon systematic variation of the starting temperature and excitation fluence.

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