Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.14: Poster

Donnerstag, 8. September 2022, 16:00–18:00, P4

Ring-shaped multi-bandpass spin wave filter — •Takuya Taniguchi, Michael Lindner, Christian Riedel, and Christian Back — Technische Universität München

Spin waves (SWs) are fundamental collective excitations of magnetic order and their wave character makes it possible to potentially realize next generation logic devices. As one of the possible logic devices, multi-bandpass filters are desired in order to forbid certain frequency bands of SWs. In this work, we design a SW wave-guide, which has a ring shape attached to the middle of a stripe. In the device, SWs (SW1s) travel through the stripe part and are split to the ring part and the stripe part at the middle of the stripe. The SWs traveling through the ring (SW2s) interfere with the SW1s after traveling one round and SW1s are suppressed when the phase difference between SW1s and SW2s is pi. We fabricate devices from 200-nanometer-thick YIG films and observe SW propagation using Brillouin light scattering (BLS). Since the phase difference depends on the wavelength of the SWs, we control the wavelength by varying the SW excitation frequency and evaluate the filtering effect. In the presentation, we report the efficiency of the ring-shaped SW filter and provide some key parameters for determining the forbidden frequencies of SWs.