Dispersionless propagation of ultra-short spin-wave pulses in ultrathin yttrium iron garnet waveguides

Abstract

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.

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Cited by in corpus (5)

• Spectrum evolution and chirping of laser-induced spin wave packets in thin iron films
• Continuous drive heterodyne microwave sensing with spin qubits in hexagonal boron nitride
• Efficient geometrical control of spin waves in microscopic YIG waveguides
• Metrics for spin-based computing
• Nonlinear suppression of dispersion broadening of ultrashort spin-wave pulses in thin YIG films