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Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves

[Image: see text] Controlling magnon densities in magnetic materials enables driving spin transport in magnonic devices. We demonstrate the creation of large, out-of-equilibrium magnon densities in a thin-film magnetic insulator via microwave excitation of coherent spin waves and subsequent multimag...

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Autores principales: Simon, Brecht G., Kurdi, Samer, La, Helena, Bertelli, Iacopo, Carmiggelt, Joris J., Ruf, Maximilian, de Jong, Nick, van den Berg, Hans, Katan, Allard J., van der Sar, Toeno
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8517981/
https://www.ncbi.nlm.nih.gov/pubmed/34597058
http://dx.doi.org/10.1021/acs.nanolett.1c02654
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author Simon, Brecht G.
Kurdi, Samer
La, Helena
Bertelli, Iacopo
Carmiggelt, Joris J.
Ruf, Maximilian
de Jong, Nick
van den Berg, Hans
Katan, Allard J.
van der Sar, Toeno
author_facet Simon, Brecht G.
Kurdi, Samer
La, Helena
Bertelli, Iacopo
Carmiggelt, Joris J.
Ruf, Maximilian
de Jong, Nick
van den Berg, Hans
Katan, Allard J.
van der Sar, Toeno
author_sort Simon, Brecht G.
collection PubMed
description [Image: see text] Controlling magnon densities in magnetic materials enables driving spin transport in magnonic devices. We demonstrate the creation of large, out-of-equilibrium magnon densities in a thin-film magnetic insulator via microwave excitation of coherent spin waves and subsequent multimagnon scattering. We image both the coherent spin waves and the resulting incoherent magnon gas using scanning-probe magnetometry based on electron spins in diamond. We find that the gas extends unidirectionally over hundreds of micrometers from the excitation stripline. Surprisingly, the gas density far exceeds that expected for a boson system following a Bose–Einstein distribution with a maximum value of the chemical potential. We characterize the momentum distribution of the gas by measuring the nanoscale spatial decay of the magnetic stray fields. Our results show that driving coherent spin waves leads to a strong out-of-equilibrium occupation of the spin-wave band, opening new possibilities for controlling spin transport and magnetic dynamics in target directions.
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spelling pubmed-85179812021-10-15 Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves Simon, Brecht G. Kurdi, Samer La, Helena Bertelli, Iacopo Carmiggelt, Joris J. Ruf, Maximilian de Jong, Nick van den Berg, Hans Katan, Allard J. van der Sar, Toeno Nano Lett [Image: see text] Controlling magnon densities in magnetic materials enables driving spin transport in magnonic devices. We demonstrate the creation of large, out-of-equilibrium magnon densities in a thin-film magnetic insulator via microwave excitation of coherent spin waves and subsequent multimagnon scattering. We image both the coherent spin waves and the resulting incoherent magnon gas using scanning-probe magnetometry based on electron spins in diamond. We find that the gas extends unidirectionally over hundreds of micrometers from the excitation stripline. Surprisingly, the gas density far exceeds that expected for a boson system following a Bose–Einstein distribution with a maximum value of the chemical potential. We characterize the momentum distribution of the gas by measuring the nanoscale spatial decay of the magnetic stray fields. Our results show that driving coherent spin waves leads to a strong out-of-equilibrium occupation of the spin-wave band, opening new possibilities for controlling spin transport and magnetic dynamics in target directions. American Chemical Society 2021-10-01 2021-10-13 /pmc/articles/PMC8517981/ /pubmed/34597058 http://dx.doi.org/10.1021/acs.nanolett.1c02654 Text en © 2021 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Simon, Brecht G.
Kurdi, Samer
La, Helena
Bertelli, Iacopo
Carmiggelt, Joris J.
Ruf, Maximilian
de Jong, Nick
van den Berg, Hans
Katan, Allard J.
van der Sar, Toeno
Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves
title Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves
title_full Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves
title_fullStr Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves
title_full_unstemmed Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves
title_short Directional Excitation of a High-Density Magnon Gas Using Coherently Driven Spin Waves
title_sort directional excitation of a high-density magnon gas using coherently driven spin waves
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8517981/
https://www.ncbi.nlm.nih.gov/pubmed/34597058
http://dx.doi.org/10.1021/acs.nanolett.1c02654
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