Equivalent Magnetic Noise Limit of Low-Cost GMI Magnetometer

Ding, Lehui; Saez, Sébastien; Dolabdjian, Christophe; Melo, L. G. C.; Yelon, A.; Ménard, David

doi:10.1109/jsen.2008.2011067

Cited by 74 publications

(37 citation statements)

References 16 publications

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“…where B 0 is a static working point and b(t) is the small signal variation of the magnetic field around B 0 [10]. Using a first order Taylor expansion, each term of the impedance matrix thus becomes…”

Section: A Basic Definitionsmentioning

confidence: 99%

“…In ref. [10], the use of a peak detector is particularly appropriate, used in combination with a pulsed current excitation stage (based on a relaxation oscillator), leading to a decrease in the resulting amplitude noise. Here we do not use pulse current excitation, since it does not permit fine tuning of the excitation current amplitude.…”

Section: A Electronic Conditioningmentioning

confidence: 99%

“…The white noise around the carrier is equivalent to narrow-band noise. Thus, the demodulation factor, k en , for the white noise around the carrier of a peak detector [9], [10] is…”

Section: ) Equivalent Magnetic Noisementioning

confidence: 99%

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Characterization of an Optimized Off-Diagonal GMI-Based Magnetometer

et al. 2013

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Abstract-An optimized giant magneto-impedance effect magnetometer has been developed, based upon an overall analysis of the measurement chain, including physical material properties, associated detection coil parameters, and equivalent magnetic noise performances. The field response model for the sensing element and the noise model yield good agreement with experimental results. The noise performance of the magnetometer, approximately 1.7 pT/ √ Hz in the white noise region, with a band-pass of about 70 kHz, is competitive with that of other technologies. Present limitations are clearly established, leaving room for further improvements.

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Section: A Basic Definitionsmentioning

confidence: 99%

Section: A Electronic Conditioningmentioning

confidence: 99%

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Characterization of an Optimized Off-Diagonal GMI-Based Magnetometer

et al. 2013

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“…Noise levels below 1 pT/√Hz can be obtained in MI sensors based on amorphous wires and ribbons [84,85], but very little work has been done on determining the noise level in thin film-based structures. In a real application, the MI element is inserted in a conditioning circuit that, in its simplest configuration, is composed of a RF oscillator (that produces the ac current exciting the MI sensitive element), a detector, and an amplifier [86]. Each of these elements contributes to the total noise of the device.…”

Section: Magnetic Noise In Thin Film MI Sensorsmentioning

confidence: 99%

Thin-Film Magneto-Impedance Sensors

Garcı́a-Arribas¹,

Férnández²,

Cos³

2017

Magnetic Sensors - Development Trends and Applications

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We review the state-of-the-art of thin films displaying the magneto-impedance (MI) effect, with focus on the aspects that are relevant to the successful design and operation of thin film-based magnetic sensors. After a brief introduction of the MI effect, the materials and geometries that maximize the performance, together with the measurement procedure for their characterization, are exposed. A nonexhaustive survey of applications is included, mostly with the aim of displaying the capabilities of thin film structures in the field of magnetic sensing, and the variety of topics covered by them. A special emphasis is made on some concepts that are not commonly treated in the literature, such as the influence of the measuring circuit on the magneto-impedance ratio, the geometry optimization by means of numerical simulation by finite element methods, or noise measurements on thin films. Additionally, a brief description of the patterning procedure by photolithography is included, since the major advantage of thin film sensors over other types of magneto-impedance materials as ribbons or wires is the possibility of patterning the sensible element in micrometric shapes, and most of all, their easy integration with the interface microelectronic circuitry.

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“…The main interest in GMI effect is related to one of the largest magnetic field sensitivities (up to 10 %/A/m) among non-cryogenic effects making it quite interesting for application in magnetic sensors and magnetometers [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Engineering of Magnetic Properties of Magnetic Microwires

Zhukov

Ipatov²,

Blanco

et al. 2018

Acta Phys. Pol. A

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We present an overview of the factors affecting soft magnetic properties, fast domain wall propagation and giant magnetoimpedance (GMI) effect in thin amorphous wires. The magnetoelastic anisotropy is one of the most important parameters that determine the magnetic properties of glass-coated microwires and therefore annealing can be very effective for manipulation the magnetic properties of amorphous ferromagnetic glass-coated microwires. Increasing of DW velocity in Fe-rich and Fe-Ni based (low Ni content) microwires is achieved after annealing. After heat treatment of Co-rich microwires we can observe transformation of inclined hysteresis loops to rectangular and coexistence of fast magnetization switching and GMI effect in the same sample. On the other hand stress annealing of Fe-and Co-rich microwires allows achievement of considerable magnetic softening and GMI effect enhancement.

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Equivalent Magnetic Noise Limit of Low-Cost GMI Magnetometer

Cited by 74 publications

References 16 publications

Characterization of an Optimized Off-Diagonal GMI-Based Magnetometer

Characterization of an Optimized Off-Diagonal GMI-Based Magnetometer

Thin-Film Magneto-Impedance Sensors

Engineering of Magnetic Properties of Magnetic Microwires

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