A design of highly sensitive GMI sensor

Yabukami, S.; Mawatari, Hiroshi; Horikoshi, N.; Murayama, Y.; Ozawa, T.; Ishiyama, K.; Arai, Kazuhiro

doi:10.1016/j.jmmm.2004.11.427

Cited by 41 publications

(22 citation statements)

References 7 publications

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“…In this connection, it is of importance to achieve low noise level. The noise performance in different sensors based on the linear MI effect has been studied previously (see, for example, [13][14][15][16][17]). A model to calculate the intrinsic magnetic noise of MI sensing element has been proposed in [18], and the contributions of the sensing element and electronic circuits to the noise have been analyzed in detail [14,15].…”

Section: Introductionmentioning

confidence: 99%

Measurement of magnetic noise in magnetoimpedance sensing element

Антонов¹,

Buznikov

Sultan-Zade³

et al. 2018

EPJ Web Conf.

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Abstract.A method for measurement of magnetic noise in magnetoimpedance sensing element is proposed. Glass-coated Co-based amorphous microwires with a slightly negative magnetostriction were used as the sensing element. The operation principle of the sensing element was based on the nonlinear off-diagonal magnetoimpedance, when field dependent higher harmonic components appeared in voltage in the pick-up coil wound around the microwire. The magnetic noise for the second harmonic in the pick-up coil voltage was studied. The dependences of the magnetic noise and the signal-to-noise ratio in the sensitive element on the current amplitude were analyzed. The noise performance of the second harmonic in the pick-up coil voltage was compared to that for a flux-gate sensing element.

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Section: Introductionmentioning

confidence: 99%

Measurement of magnetic noise in magnetoimpedance sensing element

Антонов¹,

Buznikov

Sultan-Zade³

et al. 2018

EPJ Web Conf.

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“…Therefore, the resolution for detection of localized magnetic-pole field is more than 20 times higher in the GMI sensor than that in the fluxgate sensor [16,17]. In addition, the GMI sensors have been found to be more field sensitive than the existing giant magneto-resistance (GMR) sensors [23,24]. The GMR materials generally involve large fields to obtain a response of a few percent, whereas the GMI materials can produce a few hundred percent changes in the impedance at very small magnetic fields [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Advanced Magnetic Microwires as Sensing Elements for LC-Resonant-Type Magnetoimpedance Sensors: A Comprehensive Review

Phan

2011

J Supercond Nov Magn

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In recent years, all modern vehicles and transport means use a vast variety of sensors and transducers. The operation of all medical instruments is also based on sensors and transducers. Industry is also employing more and more transducers for the monitoring and control of production lines. Therefore, the sensing technology has been driven by the increasing needs for enhanced sensitivity, improved stability, high reliability, and lower costs. For this purpose, we have proposed and developed novel two LC resonant-type magnetoimpedance (LCMI) sensor devices utilizing soft magnetic microwires as a sensing element, giving an emphasis on the use of resonance effect from LCcomponents and the rapid permeability change of the magnetic microwires to significantly improve the sensitivity performance of sensors. This article aims to provide a comprehensive analysis of the design and operation of these devices. After a description of magnetic core materials, circuit designs and fabrication techniques is given, the details of all experimental measurements are presented. The characterizations of constructed LCMI sensor devices are systematically analyzed, and the physical origins of magneto-resonant phenomena, field, and frequency dependences in these LCMI sensor devices are addressed. Influences of processing parameters on the sensing characteristics of LCMI sensors are also discussed. This enables the optimal conditions to fabricate high-performance magnetic sensing devices.

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“…The sensor possesses sensitivity of 18 µV/µT and magnetic field resolution of 100 nT. Yabukami et al used CoNbZr thin film as head element and achieved an extremely high resolution magnetic field detection of 1.7 × 10 −8 Oe at 500 kHz [10]. The only commercially available magnetic sensor based on the GMI effect is produced from the Aichi MicroIntelligent (Aichi MI) company in Japan [11].…”

Section: Introductionmentioning

confidence: 99%

Prototype Milli Gauss Meter Using Giant Magnetoimpedance Effect in Self Biased Amorphous Ribbon

Kollu¹,

Yoon²,

Kim³

et al. 2010

Journal of Magnetics

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In our present work, we developed a GMI (giant magnetoimpedance) sensor system to detect magnetic fields in the milli gauss range based on the asymmetric magnetoimpedance (AGMI) effect in Co-based amorphous ribbon with self bias field produced by field-annealing in open air. The system comprises magnetoimpedance sensor probe, signal conditioning circuits, A/D converter, USB controller, notebook computer, and program for measurement and display. Sensor probe was constructed by wire-bonding the cobalt based amorphous ribbon with dimensions 10 mm × 1 mm × 20 µm on a printed circuit board. Negative feedback was used to remove the hysteresis and temperature dependence and to increase the linearity of the system. Sensitivity of the milli gauss meter was 0.3 V/Oe and the magnetic field resolution and environmental noise level were less than 0.01 Oe and 2 mOe, respectively, in an unshielded room.

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A design of highly sensitive GMI sensor

Cited by 41 publications

References 7 publications

Measurement of magnetic noise in magnetoimpedance sensing element

Measurement of magnetic noise in magnetoimpedance sensing element

Advanced Magnetic Microwires as Sensing Elements for LC-Resonant-Type Magnetoimpedance Sensors: A Comprehensive Review

Prototype Milli Gauss Meter Using Giant Magnetoimpedance Effect in Self Biased Amorphous Ribbon

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