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Institut f. Physik FG Nanostrukturierte Materialien
Martin-Luther-Universitat Halle-Wittenberg
Von-Danckelmann-Platz 3, D-06120 Halle, Germany
Tel.: +49 345 55 25321
Fax.: +49 345 55 27034
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S.R. Lake, B. Divinskiy, G. Schmidt, S.O. Demokritov and V.E. Demidov Efficient geometrical control of spin waves in microscopic YIG waveguides Appl. Phys. Lett. 119 (2022-04-27 17:01:59), 182401 DOI: 10.1063/5.0071757
We study, experimentally and by micromagnetic simulations, the propagation of spin waves in 100-nm thick YIG waveguides, where the width linearly decreases from 2 to 0.5??m over a transition region with varying lengths between 2.5 and 10??m. We show that this geometry results in a downconversion of the wavelength, enabling efficient generation of waves with wavelengths down to 350?nm. We also find that this geometry leads to a modification in the group velocity, allowing for almost-dispersionless propagation of spin-wave pulses. Moreover, we demonstrate that the influence of energy concentration outweighs that of damping in these YIG waveguides, resulting in an overall increase in the spin-wave intensity during propagation in the transition region. These findings can be utilized to improve the efficiency and functionality of magnonic devices that use spin waves as an information carrier. |
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