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Uncooled sub-GHz spin bolometer driven by auto-oscillation

Bolometers are rectification devices that convert electromagnetic waves into direct current voltage through a temperature change. A superconducting bolometer has a responsivity of approximately 10(6)–10(7) V/W under cryogenic temperatures at infrared wavelengths; however, no devices have realized su...

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Autores principales: Goto, Minori, Yamada, Yuma, Shimura, Atsushi, Suzuki, Tsuyoshi, Degawa, Naomichi, Yamane, Takekazu, Aoki, Susumu, Urabe, Junichiro, Hara, Shinji, Nomura, Hikaru, Suzuki, Yoshishige
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7838188/
https://www.ncbi.nlm.nih.gov/pubmed/33500402
http://dx.doi.org/10.1038/s41467-020-20631-0
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author Goto, Minori
Yamada, Yuma
Shimura, Atsushi
Suzuki, Tsuyoshi
Degawa, Naomichi
Yamane, Takekazu
Aoki, Susumu
Urabe, Junichiro
Hara, Shinji
Nomura, Hikaru
Suzuki, Yoshishige
author_facet Goto, Minori
Yamada, Yuma
Shimura, Atsushi
Suzuki, Tsuyoshi
Degawa, Naomichi
Yamane, Takekazu
Aoki, Susumu
Urabe, Junichiro
Hara, Shinji
Nomura, Hikaru
Suzuki, Yoshishige
author_sort Goto, Minori
collection PubMed
description Bolometers are rectification devices that convert electromagnetic waves into direct current voltage through a temperature change. A superconducting bolometer has a responsivity of approximately 10(6)–10(7) V/W under cryogenic temperatures at infrared wavelengths; however, no devices have realized such a high responsivity in the sub-GHz frequency region. We describe a spin bolometer with a responsivity of (4.40 ± 0.04) × 10(6) V/W in the sub-GHz region at room temperature using heat generated in magnetic tunnel junctions through auto-oscillation. We attribute the unexpectedly high responsivity to a heat-induced spin-torque. This spin-torque modulates and synchronizes the magnetization precession due to the spin-torque auto-oscillation and produces a large voltage output. In our device, heat-induced spin-torque was obtained because of a large heat-controlled magnetic anisotropy change: −2.7 µJ/Wm, which is significant for enhancing dynamic range and responsivity. This study can potentially lead to the development of highly sensitive microwave detectors in the sub-GHz region.
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spelling pubmed-78381882021-01-29 Uncooled sub-GHz spin bolometer driven by auto-oscillation Goto, Minori Yamada, Yuma Shimura, Atsushi Suzuki, Tsuyoshi Degawa, Naomichi Yamane, Takekazu Aoki, Susumu Urabe, Junichiro Hara, Shinji Nomura, Hikaru Suzuki, Yoshishige Nat Commun Article Bolometers are rectification devices that convert electromagnetic waves into direct current voltage through a temperature change. A superconducting bolometer has a responsivity of approximately 10(6)–10(7) V/W under cryogenic temperatures at infrared wavelengths; however, no devices have realized such a high responsivity in the sub-GHz frequency region. We describe a spin bolometer with a responsivity of (4.40 ± 0.04) × 10(6) V/W in the sub-GHz region at room temperature using heat generated in magnetic tunnel junctions through auto-oscillation. We attribute the unexpectedly high responsivity to a heat-induced spin-torque. This spin-torque modulates and synchronizes the magnetization precession due to the spin-torque auto-oscillation and produces a large voltage output. In our device, heat-induced spin-torque was obtained because of a large heat-controlled magnetic anisotropy change: −2.7 µJ/Wm, which is significant for enhancing dynamic range and responsivity. This study can potentially lead to the development of highly sensitive microwave detectors in the sub-GHz region. Nature Publishing Group UK 2021-01-26 /pmc/articles/PMC7838188/ /pubmed/33500402 http://dx.doi.org/10.1038/s41467-020-20631-0 Text en © The Author(s) 2021 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Goto, Minori
Yamada, Yuma
Shimura, Atsushi
Suzuki, Tsuyoshi
Degawa, Naomichi
Yamane, Takekazu
Aoki, Susumu
Urabe, Junichiro
Hara, Shinji
Nomura, Hikaru
Suzuki, Yoshishige
Uncooled sub-GHz spin bolometer driven by auto-oscillation
title Uncooled sub-GHz spin bolometer driven by auto-oscillation
title_full Uncooled sub-GHz spin bolometer driven by auto-oscillation
title_fullStr Uncooled sub-GHz spin bolometer driven by auto-oscillation
title_full_unstemmed Uncooled sub-GHz spin bolometer driven by auto-oscillation
title_short Uncooled sub-GHz spin bolometer driven by auto-oscillation
title_sort uncooled sub-ghz spin bolometer driven by auto-oscillation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7838188/
https://www.ncbi.nlm.nih.gov/pubmed/33500402
http://dx.doi.org/10.1038/s41467-020-20631-0
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