Sub-pT magnetic field detection by tunnel magneto-resistive sensors

Mikihiko Oogane; Kosuke Fujiwara; Akitake Kanno; Takafumi Nakano; Hiroshi Wagatsuma; Tadashi Arimoto; Shigemi Mizukami; Seiji Kumagai; Hitoshi Matsuzaki; Nobukazu Nakasato; Yasuo Ando

doi:10.35848/1882-0786/ac3809

Sub-pT magnetic field detection by tunnel magneto-resistive sensors

Mikihiko Oogane, Kosuke Fujiwara, Akitake Kanno, Takafumi Nakano, Hiroshi Wagatsuma, Tadashi Arimoto, Shigemi Mizukami, Seiji Kumagai, Hitoshi Matsuzaki, Nobukazu Nakasato, Yasuo Ando

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We developed tunnel magneto-resistive (TMR) sensors based on magnetic tunnel junctions (MTJs) that are able to detect a weak, sub-pT, magnetic field at a low frequency. Small detectivities of 0.94 pT/Hz1/2 at 1 Hz and 0.05 pT/Hz1/2 at 1 kHz were achieved by lowering the resistance of MTJs and enhancement of the signal using a thick CoFeSiB layer and magnetic flux concentrators. We demonstrated real-time measurement of magnetocardiography (MCG) and nuclear magnetic resonance (NMR) of protons using developed sensors. This result shows that both MCG and NMR can be measured by the same measurement system with ultra-sensitive TMR sensors.

Original language	English
Article number	123002
Journal	Applied Physics Express
Volume	14
Issue number	12
DOIs	https://doi.org/10.35848/1882-0786/ac3809
Publication status	Published - 2021 Dec

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy(all)

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title = "Sub-pT magnetic field detection by tunnel magneto-resistive sensors",

abstract = "We developed tunnel magneto-resistive (TMR) sensors based on magnetic tunnel junctions (MTJs) that are able to detect a weak, sub-pT, magnetic field at a low frequency. Small detectivities of 0.94 pT/Hz1/2 at 1 Hz and 0.05 pT/Hz1/2 at 1 kHz were achieved by lowering the resistance of MTJs and enhancement of the signal using a thick CoFeSiB layer and magnetic flux concentrators. We demonstrated real-time measurement of magnetocardiography (MCG) and nuclear magnetic resonance (NMR) of protons using developed sensors. This result shows that both MCG and NMR can be measured by the same measurement system with ultra-sensitive TMR sensors.",

author = "Mikihiko Oogane and Kosuke Fujiwara and Akitake Kanno and Takafumi Nakano and Hiroshi Wagatsuma and Tadashi Arimoto and Shigemi Mizukami and Seiji Kumagai and Hitoshi Matsuzaki and Nobukazu Nakasato and Yasuo Ando",

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AU - Oogane, Mikihiko

AU - Fujiwara, Kosuke

AU - Kanno, Akitake

AU - Nakano, Takafumi

AU - Wagatsuma, Hiroshi

AU - Arimoto, Tadashi

AU - Mizukami, Shigemi

AU - Kumagai, Seiji

AU - Matsuzaki, Hitoshi

AU - Nakasato, Nobukazu

AU - Ando, Yasuo

PY - 2021/12

Y1 - 2021/12

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Sub-pT magnetic field detection by tunnel magneto-resistive sensors

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