Sensitive diamond-based magnetometry toward magnetoencephalography of a living animal

ORAL

Abstract

Diamond quantum magnetometer based on negatively charged nitrogen–vacancy (NV) centers has attracted much attentions for biomedical applications because of its robustness and good field sensitivity under an ambient condition. Magnetoencephalography (MEG) using a diamond quantum magnetometer is a major goal of the application. However, MEG requires a minimum detectable field of the order of picotesla and has not been realized with a diamond quantum sensor.

We develop a sensitive diamond quantum magnetometer with a dc sensitivity below 10 pT Hz-1/2 toward MEG of a living rat. The sensor is compatible with MEG and allows a minimum measurement distance of about 1 mm from the sensing region. Based on an Allan deviation analysis, we demonstrate that the sensor is stable with the remarkable sensitivity for at least 200 minutes and that a sub-picotesla field of 0.3 pT is detectable by interrogating the magnetic field for a few thousand seconds. Therefore, our sensor is capable of detecting a repetitive biomagnetic field, for example, a stimulus-evoked field, with a strength on the order of 1 pT by accumulating the signals.

*This work was supported by the MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) Grant No. JP- MXS0118067395 and JPMXS0118068379.

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Publication: N. Sekiguchi, M. Fushimi, A. Yoshimura, C. Shinei, M. Miyakawa, T. Taniguchi, T. Teraji, H. Abe, S. Onoda, T. Ohshima, M. Hatano, M. Sekino, T. Iwasaki, arXiv:2309.04093 (2023).

Presenters

  • Naota Sekiguchi

    • Tokyo Institute of Technology

Authors

  • Naota Sekiguchi

    • Tokyo Institute of Technology

  • Motofumi Fushimi

    • The University of Tokyo

  • Atsumi Yoshimura

    • Tokyo Institute of Technology

  • Chikara Shinei

    • National Institute for Materials Science

  • Masashi Miyakawa

    • National Institute for Materials Science

  • Takashi Taniguchi

    • Kyoto Univ
    • National Institute for Materials Science
    • Research Center for Materials Nanoarchitectonics
    • Research Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Sciences
    • NIMS
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, NIMS, Japan
    • International Center for Materials Nanoarchitectonics, Tsukuba
    • National Institue for Materials Science
    • Kyoto University
    • National Institute of Materials Science
    • International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • Tokuyuki Teraji

    • National Institute for Materials Science

  • Hiroshi Abe

    • National Institutes for Quantum Science and Technology

  • Shinobu Onoda

    • National Institutes for Quantum Science and Technology

  • Takeshi Ohshima

    • National Institutes for Quantum Science and Technology

  • Mutsuko Hatano

    • Tokyo Institute of Technology

  • Masaki Sekino

    • The University of Tokyo

  • Takayuki Iwasaki

    • Tokyo Institute of Technology