Spin waves in micro-structured yttrium iron garnet nanometer-thick films

Abstract

We investigated the spin-wave propagation in a micro-structured yttrium iron garnet waveguide of $40$ nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of $(10.06\pm 0.83)$ $\mu$m was observed. This leads to an estimated Gilbert damping constant of $\alpha =(8.79\pm 0.73)\times 10^{-4}$, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering spectroscopy.

References in corpus (4)

• Inverse Spin Hall Effect in nanometer-thick YIG/Pt system
• Phase reciprocity of spin-wave excitation by a microstrip antenna
• Spin-wave excitation and propagation in microstructured waveguides of yttrium iron garnet (YIG)/Pt bilayers
• Interference of coherent spin waves in micron-sized ferromagnetic waveguides

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