Characterization of an Optimized Off-Diagonal GMI-Based Magnetometer

Dufaÿ, Bruno; Saez, Sébastien; Dolabdjian, Christophe; Yelon, A.; Ménard, David

doi:10.1109/jsen.2012.2216521

Cited by 61 publications

(58 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These noise levels are significantly larger than the ones reported in wires and ribbons [84,85], but are promising for applications. Besides, the noise level can be reduced easily by a factor of 4 by using MI thin films with enhanced sensitivities (up to 300%/Oe), as the ones described recently [53].…”

Section: Magnetic Noise In Thin Film MI Sensorsmentioning

confidence: 65%

“…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].…”

Section: Magnetic Noise In Thin Film MI Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Thin-Film Magneto-Impedance Sensors

Garcı́a-Arribas¹,

Férnández²,

Cos³

2017

Magnetic Sensors - Development Trends and Applications

View full text Add to dashboard Cite

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.

show abstract

Section: Magnetic Noise In Thin Film MI Sensorsmentioning

confidence: 65%

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

View full text Add to dashboard Cite

show abstract

“…In most cases, the output noise spectral density can usually be separated into a low frequency, excess, 1/f , noise, and a white noise floor [4], [5], [6], [7]. As highlighted in previous work [8], the white noise floor is mostly limited by the electronic conditioning noise level. Consequently, it will be advantageous to increase the voltage sensitivity of the sensing element until the electronic conditioning noise and the sensor noise become comparable.…”

mentioning

confidence: 98%

“…One approach to improvement of the sensitivity is the choice of a two-port network configuration, in which the GMI element is associated with a pick-up coil (this is sometimes referred to as off-diagonal GMI [9] or orthogonal flux-gate in the fundamental mode [10], [5]). A white noise model and expected performance of such a sensor have been presented in [6], [8].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Low Frequency Excess Noise Source Investigation of Off-Diagonal GMI-Based Magnetometers

et al. 2017

View full text Add to dashboard Cite

Abstract-The equivalent magnetic noise spectral densities of off-diagonal GMI based magnetometers exhibit significant low frequency excess noise, proportional to 1/f noise. As it represents a serious limitation to the ultimate sensing performances of high sensitivity magnetometers, possible sources of this 1/f noise are under investigation. Low frequency magnetization fluctuations have been proposed as the noise source in the case of classical GMI-based sensors. Here, we apply this model to off-diagonal GMI-based magnetometers. This requires the inclusion of magnetization fluctuation noise sources, in addition to white noise sources from electronic conditioning in the GMI effect equations. A pessimistic scenario is presented, predicting the upper limit of low frequency excess noise from material characteristics. The equivalent magnetic noise level is then computed from the sensitivity of each term of the sensing element impedance matrix to the magnetization angle at the static working point (for both axial and circumferential static magnetic field) and to conditioning circuitry. Based on this, it appears that magnetization fluctuations similarly affect all modes of operation of the two-port network sensing element, inducing identical impedance fluctuations. It also appears that this noise depends only upon the static equilibrium condition. This condition is governed by the effective anisotropy of the magnetic wire and by both axial and circumferential static components of the working point.

show abstract

Self‐Assembled On‐Chip‐Integrated Giant Magneto‐Impedance Sensorics

et al. 2015

View full text Add to dashboard Cite

A novel method relying on strain engineering to realize arrays of on‐chip‐integrated giant magneto‐impedance (GMI) sensors equipped with pick‐up coils is put forth. The geometrical transformation of an initially planar layout into a tubular 3D architecture stabilizes favorable azimuthal magnetic domain patterns. This work creates a solid foundation for further development of CMOS compatible GMI sensorics for magnetoencephalography.

show abstract

Characterization of an Optimized Off-Diagonal GMI-Based Magnetometer

Cited by 61 publications

References 14 publications

Thin-Film Magneto-Impedance Sensors

Thin-Film Magneto-Impedance Sensors

Low Frequency Excess Noise Source Investigation of Off-Diagonal GMI-Based Magnetometers

Self‐Assembled On‐Chip‐Integrated Giant Magneto‐Impedance Sensorics

Contact Info

Product

Resources

About