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

Keiji Tsukada, Takuya Yasugi, Yatsuse Majima, Kenji Sakai, Toshihiko Kiwa

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)56670
JournalAIP Advances
Volume7
Issue number5
DOIs
Publication statusPublished - May 1 2017
Externally publishedYes

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