Dispersionless propagation of ultra-short spin-wave pulses in ultrathin yttrium iron garnet waveguides
| Autor: | P. Bortolotti, Sergej O. Demokritov, V. E. Demidov, Romain Lebrun, J. Ben Youssef, Vicent Cros, S. Michaelis de Vasoncellos, H. Merbouche, Rudolf Bratschitsch, B. Divinskiy, D. Gouéré, K. O. Nikolaev, Abdelmadjid Anane |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Yttrium iron garnet
FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 01 natural sciences Molecular physics law.invention chemistry.chemical_compound law Spin wave Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Dispersion (optics) 010306 general physics Physics Condensed Matter - Mesoscale and Nanoscale Physics Nanosecond 021001 nanoscience & nanotechnology Pulse (physics) Brillouin zone chemistry Temporal resolution 0210 nano-technology Waveguide Optics (physics.optics) Physics - Optics |
| Popis: | We study experimentally the propagation of nanosecond spin-wave pulses in microscopic waveguides made of nanometer-thick yttrium iron garnet films. For these studies, we use micro-focus Brillouin light scattering spectroscopy, which provides the possibility to observe propagation of the pulses with high spatial and temporal resolution. We show that, for most spin-wave frequencies, dispersion leads to broadening of the pulse by several times at propagation distances of 10 micrometers. However, for certain frequency interval, the dispersion broadening is suppressed almost completely resulting in a dispersionless pulse propagation. We show that the formation of the dispersion-free region is caused by the competing effects of the dipolar and the exchange interaction, which can be controlled by the variation of the waveguide geometry. These conclusions are supported by micromagnetic simulations and analytical calculations. Our findings provide a simple solution for the implementation of high-speed magnonic systems that require undisturbed propagation of short information-carrying spin-wave pulses. |
| Databáze: | OpenAIRE |
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