Absolute-magnetic-field measurement using nanogranular in-gap magnetic sensor with second-harmonic and liquid-nitrogen-temperature operation | Zendy

Keiji Tsukada | Zendy; Takuya Yasugi | Zendy; Yatsuse Majima | Zendy; Kenji Sakai | Zendy; Toshihiko Kiwa | Zendy

Open Access

Absolute-magnetic-field measurement using nanogranular in-gap magnetic sensor with second-harmonic and liquid-nitrogen-temperature operation

Author(s) -

Keiji Tsukada,

Takuya Yasugi,

Yatsuse Majima,

Kenji Sakai,

Toshihiko Kiwa

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4978217

Subject(s) - magnetic field , liquid nitrogen , materials science , electromagnetic coil , harmonic , linearity , signal (programming language) , sensitivity (control systems) , lock in amplifier , nuclear magnetic resonance , optoelectronics , amplifier , chemistry , physics , acoustics , electrical engineering , electronic engineering , cmos , engineering , organic chemistry , quantum mechanics , computer science , programming language

To detect the absolute magnetic field, such as the earth’s magnetic field, a linear magnetic response, a zero point, and thermal stability are required. We thus propose an operating method and sensor probe consisting of a nanogranular in-gap magnetic sensor (GIGS), an operational amplifier integrated circuit, and a modulation coil. The sensor probe was operated in second-harmonic mode at a liquid-nitrogen (Liq. N2) temperature. When an AC magnetic field was applied to GIGS, the second-harmonic signal was generated and modulated by the outer magnetic field to be measured. After lock-in detection, the modulated output signal showed good linearity and a zero point. Moreover, higher sensitivity and low noise with low thermal fluctuation was obtained by the cooling at Liq. N2 temperature

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