Spin Wave Electromagnetic Nano-Antenna Enabled by Tripartite Phonon-Magnon-Photon Coupling
| Autor: | Raisa Fabiha, Jonathan Lundquist, Sudip Majumder, Erdem Topsakal, Anjan Barman, Supriyo Bandyopadhyay |
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| Rok vydání: | 2021 |
| Předmět: |
Condensed Matter - Mesoscale and Nanoscale Physics
General Chemical Engineering General Engineering General Physics and Astronomy Medicine (miscellaneous) FOS: Physical sciences Systems and Control (eess.SY) Applied Physics (physics.app-ph) Physics - Applied Physics Biochemistry Genetics and Molecular Biology (miscellaneous) Electrical Engineering and Systems Science - Systems and Control Condensed Matter::Materials Science Mesoscale and Nanoscale Physics (cond-mat.mes-hall) FOS: Electrical engineering electronic engineering information engineering General Materials Science Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Advanced science (Weinheim, Baden-Wurttemberg, Germany). 9(8) |
| ISSN: | 2198-3844 |
| Popis: | We investigate tripartite coupling between phonons, magnons and photons in a periodic array of elliptical magnetostrictive nanomagnets delineated on a piezoelectric substrate to form a two-dimensional two-phase multiferroic crystal. A surface acoustic wave (phonons) of 5 - 35 GHz frequency launched into the substrate causes the magnetizations of the nanomagnets to precess at the frequency of the wave, giving rise to spin waves (magnons). The spin waves, in turn, radiate electromagnetic waves (photons) into the surrounding space at the surface acoustic wave frequency. Here, the phonons couple into magnons, which then couple into photons. This tripartite phonon-magnon-photon coupling is exploited to implement an extreme sub-wavelength electromagnetic antenna whose measured radiation efficiency and antenna gain exceed the theoretical limits for traditional antennas by more than two orders of magnitude at some frequencies. Micro-magnetic simulations are in excellent agreement with experimental observations and provide insight into the spin wave modes that couple into radiating electromagnetic modes to implement the antenna. Published in Advanced Science, 2104644 (2022) |
| Databáze: | OpenAIRE |
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