Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 39: Poster Magnetism II
MA 39.22: Poster
Wednesday, March 11, 2026, 18:00–21:00, P2
prospects of studying circularly polarised phonons in 2D magnetic materials — •Hanna Shirin Pulikkal Hamza1, Lukas Nöding1, Helya Alaei1, Ahmed Hassanien1, Mashood Tariq Mir1, Zdeněk Sofer2, Jochen Mikosch1, Thomas Baumert1, and Arne Senftleben1 — 1Institute of Physics,University of Kassel, 34132 Kassel, Germany — 2UCT Prague
It has been proposed that circularly polarised phonons can induce transient magnetisation in materials when driven by ultrafast laser pulses via the atomistic scale Barnett effect. In this ongoing study, we want to directly link the observation of circular atomic motion with magnetisation in 2D Van der Waals room temperature ferromagnetic materials. We have recently induced circularly polarised coherent phonons by a pair of femto-second laser pulses in a non-magnetic material namely graphite and detected the resulting lattice dynamics using Ultrafast Electron Diffraction (UED). In this contribution, we will review the results on graphite and show our recent progress in exfoliating ferromagnetic 2D materials. Furthermore, we will explore magnetisation measurements of our microscopic samples using Kerr microscopy and vibrating sample magnetometry.
Keywords: Ultra Fast Electron Diffraction; 2d Vanderwaals ferromagnetic materials; circularly polarised phonons