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Spin Wave Radiation by a Topological Charge Dipole

Díaz Santiago, Sebastián A. and Hirosawa, Tomoki and Loss, Daniel and Psaroudaki, Christina (2020) Spin Wave Radiation by a Topological Charge Dipole. Nano Letters, 20 (9). pp. 6556-6562. ISSN 1530-6984. https://resolver.caltech.edu/CaltechAUTHORS:20200819-162804763

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acs.nanolett.0c02192DOIArticle
ORCID:
AuthorORCID
Díaz Santiago, Sebastián A.0000-0003-2242-3728
Hirosawa, Tomoki0000-0003-4525-586X
Loss, Daniel0000-0001-5176-3073
Psaroudaki, Christina0000-0002-7073-6422
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.
Funders:
Funding AgencyGrant Number
Japan Society for the Promotion of Science (JSPS)18J21985
Young Researchers' Exchange Program (Japan-Switzerland)UNSPECIFIED
Marie Curie Fellowship839004
Swiss National Science Foundation (SNSF)UNSPECIFIED
Subject Keywords:magnetic skyrmions, magnonics, spin waves, directional emission, nanoantenna, spintronics
Issue or Number:9
Record Number:CaltechAUTHORS:20200819-162804763
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200819-162804763
Official Citation:Spin Wave Radiation by a Topological Charge Dipole. Sebastián A. Díaz, Tomoki Hirosawa, Daniel Loss, and Christina Psaroudaki. Nano Letters 2020 20 (9), 6556-6562; DOI: 10.1021/acs.nanolett.0c02192
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105042
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:20 Aug 2020 16:46
Last Modified:09 Sep 2020 21:41

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