Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.1: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Time-resolved Raman scattering in exotic magnetic materials — •Rolf B. Versteeg¹, Anuja Sahasrabudhe¹, Jingyi Zhu¹, Christoph Boguschewski¹, Petra Becker², and Paul H.M. van Loosdrecht¹ — ¹II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Deutschland — ²Abteilung Kristallographie, Institut für Geologie und Mineralogie, Universität zu Köln, Greinstraße 77, D-50937 Köln, Deutschland

Magnetic materials show fascinating physical phenomena when brought out of their thermal equilibrium state. Many of these phenomena show a large potential towards applications. For strongly perturbed magnetic systems, these phenomena include magnetization reversal, non-thermal ultrafast magnetization recording, and the creation of metastable light-induced states. Closer to equilibrium non-thermal states can provide insight into energy and angular momentum transfer between the lattice, electronic, orbital and magnetic degrees of freedom. A less common technique to study magnetization dynamics is presented: time-resolved spontaneous Raman scattering. This technique allows to simultaneously track transient changes in quasiparticle population, excitation energies, and optical constants related to the lattice and magnetic degrees of freedom. It thereby provides a unique way to study magnetization dynamics in exotic magnetic materials, such as the helimagnet Cu₂OSeO₃, or other net-zero magnetization materials like spin cycloids and antiferromagnets.