Spin Wave Radiation by a Topological Charge Dipole
Abstract
The use of spin waves (SWs) as data carriers in spintronic and magnonic logic devices offers operation at low power consumption, free of Joule heating. Nevertheless, the controlled emission and propagation of SWs in magnetic materials remains a significant challenge. Here, we propose that skyrmion–antiskyrmion bilayers form topological charge dipoles and act as efficient sub-100 nm SW emitters when excited by in-plane ac magnetic fields. The propagating SWs have a preferred radiation direction, with clear dipole signatures in their radiation pattern, suggesting that the bilayer forms a SW antenna. Bilayers with the same topological charge radiate SWs with spiral and antispiral spatial profiles, enlarging the class of SW patterns. We demonstrate that the characteristics of the emitted SWs are linked to the topology of the source, allowing for full control of the SW features, including their amplitude, preferred direction of propagation, and wavelength.
Additional Information
© 2020 American Chemical Society. Received: June 3, 2020; Revised: August 18, 2020; Published: August 19, 2020. T.H. is grateful to T. Hinokihara for useful discussions. T.H. was supported by the Japan Society for the Promotion of Science through Program for Leading Graduate Schools (MERIT), JSPS KAKENHI (Grant No. 18J21985) and Young Researchers' Exchange Program between Japan and Switzerland 2018. C.P. has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement No. 839004. S.A.D. and D.L. were supported by the Swiss National Science Foundation (Switzerland) and the NCCR QSIT. Author Contributions: S.A.D. and T.H. contributed equally to this work. The authors declare no competing financial interest.Attached Files
Supplemental Material - nl0c02192_si_001.mp4
Supplemental Material - nl0c02192_si_002.mp4
Supplemental Material - nl0c02192_si_003.mp4
Supplemental Material - nl0c02192_si_004.mp4
Supplemental Material - nl0c02192_si_005.mp4
Supplemental Material - nl0c02192_si_006.mp4
Supplemental Material - nl0c02192_si_007.pdf
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Additional details
- Eprint ID
- 105042
- DOI
- 10.1021/acs.nanolett.0c02192
- Resolver ID
- CaltechAUTHORS:20200819-162804763
- 18J21985
- Japan Society for the Promotion of Science (JSPS)
- Young Researchers' Exchange Program (Japan-Switzerland)
- 839004
- Marie Curie Fellowship
- Swiss National Science Foundation (SNSF)
- Created
-
2020-08-20Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field