SFB 1432 Colloquium: Periodic drive and topology link textures and magnons
Time
Thursday, 27. April 2023
15:15 - 16:30
Location
P603
Organizer
SFB 1432 / Prof. Dr. W. Belzig
Speaker:
Dr. Sebastian Diaz, Universität Konstanz
The magnetization field in solids can develop static structures with nontrivial topology that when coupled to a time-periodic drive support novel magnonic excitations. I will present our theoretical investigation of two platforms where topological magnetic textures and magnons can be controlled.
In the first platform, a skyrmion-antiskyrmion bilayer forms a topological charge dipole when excited by in-plane AC magnetic fields and acts as an efficient spin-wave antenna [1]. In the second platform, high-frequency laser irradiation on multiferroic insulators induces off-resonance skyrmion motion and a Floquet magnonic topological phase transition in a laser-driven skyrmion crystal [2]. Finally, I will discuss our recent proposal to exploit AC electric fields in frustrated magnets to construct a magnetic soliton with nontrivial topology in spacetime.
Our findings envisage the periodic driving of topological magnetic textures as a promising method to engineer spin waves for magnonics and to construct topological magnetic solitons in spacetime.
[1] S. A. Díaz, T. Hirosawa, D. Loss, and C. Psaroudaki, Nano Lett. 20, 6556 (2020)
[2] T. Hirosawa, J. Klinovaja, D. Loss, and S. A. Díaz, Phys. Rev. Lett. 128, 037201 (2022)
