Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Magnonics 2

MA 28.3: Vortrag

Donnerstag, 8. September 2022, 10:00–10:15, H43

Hybridization Induced Spin-Wave Stop Band — •Christian Riedel, Takuya Taniguchi, and Christian H. Back — Technische Universität München

We present complex spin-wave diffraction patterns in the near-field diffraction limit by using a custom-made time-resolved magneto-optical Kerr effect (TR-MOKE) microscope for visualizing the local and time-resolved dynamic magnetization, i.e. propagating spin-waves. To investigate magnonic interference behaviors, we fabricate a diffraction grating in a 200 nm thick ferrimagnetic YIG film by argon ion-beam etching. A coplanar waveguide (CPW) located parallel to the grating, is used to coherently excite spin-waves. Our results represent the experimental realization of complex spin-wave interference patterns arising from various diffraction gratings, as preliminary investigated by Mansfeld et al.. We further demonstrate that the interference pattern behind the diffraction grating can be tuned through careful selection of the external magnetic field strength. A reduction in the effective magnetic field between the grating antidots can lead to a hybridization of two spin-wave modes and with this to a spin-wave transmission stop-band. This work contributes to the understanding of spin-wave interference behaviors for enhancing the performance of future magnonic devices.