We report experimental results on spin-wave propagation, transmission gap tuning, and mode conversion in straight, curved, and Y-shaped yttrium iron garnet waveguides with magnonic crystals made of submicrometer-wide airgrooves. We observe forbidden frequency gaps with sizes up to 200 MHz in straight waveguides and narrowing of the gaps in curved and Y-shaped waveguides. The spin-wave transmission signal is strongly suppressed inside the gaps and remains high at allowed frequencies for all waveguide types. Using super-Nyquist sampling magneto-optical Kerr effect microscopy, we image symmetric and asymmetric spin-wave interference patterns, the self-focusing of propagating spin waves, and interconversions between width modes with different quantization numbers.
Tuning of spin-wave transmission and mode conversion in microscopic YIG waveguides with magnonic crystals
Nikolai Kuznetsov, Huajun Qin, Lukáš Flajšman, Sebastiaan van Dijken; Tuning of spin-wave transmission and mode conversion in microscopic YIG waveguides with magnonic crystals. J. Appl. Phys. 21 November 2022; 132 (19): 193904. https://doi.org/10.1063/5.0123234
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