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Uncooled sub-GHz spin bolometer driven by auto-oscillation

Author

Listed:
  • Minori Goto

    (Graduate School of Engineering Science, Osaka University
    Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University)

  • Yuma Yamada

    (Graduate School of Engineering Science, Osaka University)

  • Atsushi Shimura

    (TDK Corporation)

  • Tsuyoshi Suzuki

    (TDK Corporation)

  • Naomichi Degawa

    (TDK Corporation)

  • Takekazu Yamane

    (TDK Corporation)

  • Susumu Aoki

    (TDK Corporation)

  • Junichiro Urabe

    (TDK Corporation)

  • Shinji Hara

    (TDK Corporation)

  • Hikaru Nomura

    (Graduate School of Engineering Science, Osaka University
    Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University)

  • Yoshishige Suzuki

    (Graduate School of Engineering Science, Osaka University
    Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University)

Abstract

Bolometers are rectification devices that convert electromagnetic waves into direct current voltage through a temperature change. A superconducting bolometer has a responsivity of approximately 106–107 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) × 106 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.

Suggested Citation

  • Minori Goto & Yuma Yamada & Atsushi Shimura & Tsuyoshi Suzuki & Naomichi Degawa & Takekazu Yamane & Susumu Aoki & Junichiro Urabe & Shinji Hara & Hikaru Nomura & Yoshishige Suzuki, 2021. "Uncooled sub-GHz spin bolometer driven by auto-oscillation," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20631-0
    DOI: 10.1038/s41467-020-20631-0
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    Cited by:

    1. Keqiang Zhu & Mario Carpentieri & Like Zhang & Bin Fang & Jialin Cai & Roman Verba & Anna Giordano & Vito Puliafito & Baoshun Zhang & Giovanni Finocchio & Zhongming Zeng, 2023. "Nonlinear amplification of microwave signals in spin-torque oscillators," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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