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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.5: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P3
Three-magnon scattering in a displaced magnetic vortex — •Lukas Körber1,2, Katrin Schultheiss1, Tobias Hula1, Roman Verba3, Attila Kákay1, and Helmut Schultheiss1,2 — 1Helmholtz-Zentrum Dresden - Rossendorf, Germany — 2TU Dresden, Germany — 3Institute of Magnetism, National Academy of Sciences of Ukraine, Kyiv, Ukraine
In a small ferromagnetic disk which is magnetized in the vortex state, only a discrete set of spin-wave modes exists due the confinement as well as the cylindrical symmetry. When a radial mode is excited above certain threshold power it may decay into two azimuthal spin-wave modes via a process called three-magnon scattering. The three-magnon scattering in such a case has been found to obey certain selection rules which lead for the mode profiles of the secondary waves to be distinct from each other [1]. Here, we study the stability of this process when the cylindrical symmetry is broken by displacing the vortex with an external magnetic field. We find that the selection rules are maintained and three-magnon scattering into two different azimuthal modes persists below the vortex annihilation field. Moreover, we observe the appearance of additional secondary modes which appear for a certain range of external fields and for lower excitation field powers than the regular vortex modes. Financial support of within DFG programme SCHU 2922/1-1 and KA 5069/1-1 is acknowledged.
[1] Phys. Rev. Lett. 122, 097202