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Giant nonreciprocal emission of spin waves in Ta/Py bilayers

Spin waves are propagating disturbances in the magnetization of magnetic materials. One of their interesting properties is nonreciprocity, exhibiting that their amplitude depends on the magnetization direction. Nonreciprocity in spin waves is of great interest in both fundamental science and applica...

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Autores principales: Kwon, Jae Hyun, Yoon, Jungbum, Deorani, Praveen, Lee, Jong Min, Sinha, Jaivardhan, Lee, Kyung-Jin, Hayashi, Masamitsu, Yang, Hyunsoo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4942323/
https://www.ncbi.nlm.nih.gov/pubmed/27419231
http://dx.doi.org/10.1126/sciadv.1501892
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author Kwon, Jae Hyun
Yoon, Jungbum
Deorani, Praveen
Lee, Jong Min
Sinha, Jaivardhan
Lee, Kyung-Jin
Hayashi, Masamitsu
Yang, Hyunsoo
author_facet Kwon, Jae Hyun
Yoon, Jungbum
Deorani, Praveen
Lee, Jong Min
Sinha, Jaivardhan
Lee, Kyung-Jin
Hayashi, Masamitsu
Yang, Hyunsoo
author_sort Kwon, Jae Hyun
collection PubMed
description Spin waves are propagating disturbances in the magnetization of magnetic materials. One of their interesting properties is nonreciprocity, exhibiting that their amplitude depends on the magnetization direction. Nonreciprocity in spin waves is of great interest in both fundamental science and applications because it offers an extra knob to control the flow of waves for the technological fields of logics and switch applications. We show a high nonreciprocity in spin waves from Ta/Py bilayer systems with out-of-plane magnetic fields. The nonreciprocity depends on the thickness of Ta underlayer, which is found to induce an interfacial anisotropy. The origin of observed high nonreciprocity is twofold: different polarities of the in-plane magnetization due to different angles of canted out-of-plane anisotropy and the spin pumping effect at the Ta/Py interface. Our findings provide an opportunity to engineer highly efficient, nonreciprocal spin wave–based applications, such as nonreciprocal microwave devices, magnonic logic gates, and information transports.
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spelling pubmed-49423232016-07-14 Giant nonreciprocal emission of spin waves in Ta/Py bilayers Kwon, Jae Hyun Yoon, Jungbum Deorani, Praveen Lee, Jong Min Sinha, Jaivardhan Lee, Kyung-Jin Hayashi, Masamitsu Yang, Hyunsoo Sci Adv Research Articles Spin waves are propagating disturbances in the magnetization of magnetic materials. One of their interesting properties is nonreciprocity, exhibiting that their amplitude depends on the magnetization direction. Nonreciprocity in spin waves is of great interest in both fundamental science and applications because it offers an extra knob to control the flow of waves for the technological fields of logics and switch applications. We show a high nonreciprocity in spin waves from Ta/Py bilayer systems with out-of-plane magnetic fields. The nonreciprocity depends on the thickness of Ta underlayer, which is found to induce an interfacial anisotropy. The origin of observed high nonreciprocity is twofold: different polarities of the in-plane magnetization due to different angles of canted out-of-plane anisotropy and the spin pumping effect at the Ta/Py interface. Our findings provide an opportunity to engineer highly efficient, nonreciprocal spin wave–based applications, such as nonreciprocal microwave devices, magnonic logic gates, and information transports. American Association for the Advancement of Science 2016-07-01 /pmc/articles/PMC4942323/ /pubmed/27419231 http://dx.doi.org/10.1126/sciadv.1501892 Text en Copyright © 2016, The Authors http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Kwon, Jae Hyun
Yoon, Jungbum
Deorani, Praveen
Lee, Jong Min
Sinha, Jaivardhan
Lee, Kyung-Jin
Hayashi, Masamitsu
Yang, Hyunsoo
Giant nonreciprocal emission of spin waves in Ta/Py bilayers
title Giant nonreciprocal emission of spin waves in Ta/Py bilayers
title_full Giant nonreciprocal emission of spin waves in Ta/Py bilayers
title_fullStr Giant nonreciprocal emission of spin waves in Ta/Py bilayers
title_full_unstemmed Giant nonreciprocal emission of spin waves in Ta/Py bilayers
title_short Giant nonreciprocal emission of spin waves in Ta/Py bilayers
title_sort giant nonreciprocal emission of spin waves in ta/py bilayers
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4942323/
https://www.ncbi.nlm.nih.gov/pubmed/27419231
http://dx.doi.org/10.1126/sciadv.1501892
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