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Seminar: 'Topological switching in magnetic thin films by fast electrical and optical excitations" (Lecture)

Tuesday 14 January 2020Add to my calendar
from 12:30
dr. Felix Büttner (Laboratory for Spin Dynamics,MIT, USA)

Felix BüttnerMagnetic skyrmions are long-lived topological excitations of some thin film magnetic materials. Topological transitions, as required for the nucleation of a skyrmion, are in principle allowed due to the discrete nature of the lattice but still suppressed by strong energy barriers [1]. In this talk, I will first give a brief introduction to the topic of skyrmions and then present several examples of how to achieve topological switching using fast electrical and optical stimuli [2-4]. A significant focus of the talk will be on our recent direct time-resolved observation of the skyrmion formation dynamics as measured at the new European free-electron laser (XFEL) source.

  1. Büttner, F., Lemesh, I. & Beach, G. S. D. Theory of isolated magnetic skyrmions: From fundamentals to room temperature applications. Scientific Reports8, 4464 (2018).
  2. Büttner, F. et al. Field-free deterministic ultrafast creation of magnetic skyrmions by spin–orbit torques. Nature Nanotechnology12, 1040 (2017).
  3. Büttner, F. et al. Thermal nucleation and high-resolution imaging of submicrometer magnetic bubbles in thin thulium iron garnet films with perpendicular anisotropy. Physical Review Materials (accepted).
  4. Büttner, F. et al. Ultrafast all-optical topological switching observed in real time using a free-electron laser (submitted).
dr. Johan Mentink