Development of multicore magneto-impedance sensor for stable pico-Tesla resolution

Author

Uchiyama, Tsuyoshi ; Hamada, Nozomu ; Changmei Cai

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Nagoya Univ., Nagoya, Japan

fYear

2013

fDate

3-5 Dec. 2013

Firstpage

573

Lastpage

577

Abstract

We investigated the noise from amorphous wire magneto-impedance elements in a CMOS pulse sensor circuit and clarified the average current bias effect for low-noise magneto-impedance sensor operation. In order to raise the signal-to-noise ratio (SNR), a single-core head and multicore head were compared. We showed that the noise floor of the four-core head magneto-impedance sensor is lower than 1 pT/Hz^1/2 for the frequency range of 20 to 500 Hz. This result will be useful for designing a high SNR magneto-impedance sensor based on amorphous wire in combination with a CMOS pulse circuit.

Keywords

CMOS integrated circuits; magnetic cores; magnetic sensors; pulse circuits; CMOS pulse sensor circuit; current bias effect; frequency 20 Hz to 500 Hz; low-noise magnetoimpedance sensor operation; multicore head; multicore magneto-impedance sensor; signal-to-noise ratio; single-core head; stable picoTesla resolution; Amorphous magnetic materials; Coils; Magnetic heads; Magnetic noise; Magnetic shielding; Noise; Wires; amorphous wire; magetic sensor; magneto-impedance element; pico-Tesla resolution;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensing Technology (ICST), 2013 Seventh International Conference on

Conference_Location

Wellington

ISSN

2156-8065

Print_ISBN

978-1-4673-5220-8

Type

conf

DOI

10.1109/ICSensT.2013.6727718

Filename

6727718