Advancing the development of spin-wave devices requires high-quality low-damping magnetic materials where magnon spin currents can efficiently propagate and effectively interact with local magnetic textures. Here we show that magnetic domain walls can modulate spin-wave transport in perpendicularly magnetized channels of Bi-doped yttrium iron garnet. Conversely, we demonstrate that the magnon spin current can drive domain-wall motion in the Bi-doped yttrium iron garnet channel device by means of magnon spin-transfer torque. The domain wall can be reliably moved over 15–20 µm distances at zero applied magnetic field by a magnon spin current excited by a radio-frequency pulse as short as 1 ns. The required energy for driving the domain-wall motion is orders of magnitude smaller than those reported for metallic systems. These results facilitate low-switching-energy magnonic devices and circuits where magnetic domains can be efficiently reconfigured by magnon spin currents flowing within magnetic channels.
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C.A.R., M.J.G., Y.F. and T.F. acknowledge support from SMART, one of seven centres of nCORE, a Semiconductor Research Corporation program, sponsored by the National Institute of Standards and Technology (NIST), and the National Science Foundation under award DMR 1808190. S.N. was supported by Fujikura. L.L. acknowledges financial support from the National Science Foundation under award DMR-2104912. Shared facilities of CMSE (MRSEC DMR-1419807) were used. We thank S.-K. Kim for helpful discussions on spin wave dispersion in the Bi-YIG material.
The authors declare no competing interests.
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Supplementary Figs. 1–7 and Notes 1–11.
Magnon-induced DW motion from nanosecond RF pulses. The top-right antenna injects sequential 1 ns pulses at 4.35 GHz with increasing power (indicated in dBm on the bottom-right scale bar). A DW is pinned under the bottom-left antenna and is propagated towards the right injector antenna after the 19 dBm RF pulse.
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Fan, Y., Gross, M.J., Fakhrul, T. et al. Coherent magnon-induced domain-wall motion in a magnetic insulator channel. Nat. Nanotechnol. 18, 1000–1004 (2023). https://doi.org/10.1038/s41565-023-01406-2
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