Giant magnetoimpedance sensors

Hauser, Markus; Kraus, L.; Ripka, Pavel

doi:10.1109/5289.930983

Cited by 94 publications

(52 citation statements)

References 3 publications

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“…This differs the FeCoiNi/CuBe electrodeposited wire investigated in present work from previously reported data on GMI sensors with flat geometry (thin film or amorphous/nanocrystalline ribbon based sensitive elements) [21,22] for which GMI responses are not or not sufficiently sensitive in the case of the angles α < 60˚ and especially α < 30˚.…”

Section: Resultscontrasting

confidence: 93%

“…This explains a significant hysteresis observed both in the positive and negative fields close to the GMI maxima (Figure 1). Although this kind of hysteresis is a disadvantage for technological applications it can be reduced either by the increase of the intensity of the alternating current [19] or by the design of double sensitive element configuration detector [22]. The impedance of the field annealed electroplated wire shows strong dependence on the magnetic field.…”

Section: Resultsmentioning

confidence: 99%

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Giant Magnetoimpedance of Cube/Feconi Electroplated Wires: Focus on Angular Sensoric

Kurlyandskaya¹,

Jantaratana²,

Cerdeira³

et al. 2013

WJCMP

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Giant magnetoimpedance effect (GMI) is a subject of special interest proved by applied electrodynamic and technological applications. GMI effect in ferromagnetic tubes is connected with the high sensitivity of the magnetic system to a circular magnetic field near the spin-reorientation magnetic phase transitions offering high sensitivity with respect to an external magnetic field. In this work the non-magnetic CuBe wires were covered by Fe 20 Co 6 Ni 74 layers by electrodeposition. The thickness of 1 μm for magnetic layer was high enough in order to ensure the high GMI value. Longitudinal magnetic anisotropy was induced by post preparation annealing in a magnetic field of 160 A/m at 320˚C during 1 hour in order to obtain appropriate magnetisation process. Angular dependencies of GMI were measured in a frequency range of 1 to 10 MHz for driving currents of 2.5 to 20 mA. High longitudinal GMI of the order of 400% was observed at quite low frequency of 1 MHz. The highest value of the sensitivity of 520%/Oe was found for the active resistance: Linear sensitivities of 0.023 Ω/˚ and 0.05 Ω/˚ were observed for reasonably low fields of 240 and 275 A/m respectively for small angles, where planar GMI elements are less effective.

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Section: Resultscontrasting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Giant Magnetoimpedance of Cube/Feconi Electroplated Wires: Focus on Angular Sensoric

Kurlyandskaya¹,

Jantaratana²,

Cerdeira³

et al. 2013

WJCMP

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“…The rounding of the peaks is due to a distribution of the anisotropy field direction. a It is defined as λ s = δl/l, the largest relative change in length due to application of a magnetic field [16]. The GMI ratio is given in the second column whereas the sensitivity with respect to the magnetic field is given by the largest value of the derivative of the ratio (third column).…”

Section: Figures and Tablesmentioning

confidence: 99%

Giant magneto-impedance and its applications

Tannous

Gieraltowski

2004

Journal of Materials Science: Materials in Electronics

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The status of Giant Magneto-Impedance effect is reviewed in wires, ribbons and multilayered soft ferromagnetic thin films. After establishing the theoretical framework for the description of the effect, and the constraints any material should have in order to show the effect, experimental work in wires, ribbons and multilayered thin films is described. Existing and potential applications of the effect in electronics and sensing are highlighted.

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“…The permeability grows until the external magnetic field (H) becomes sufficiently high to rotate the magnetic domains of the sample along its direction. The permeability dependence with the magnetic field and with the current modifies the skin depth of the current inside the material and, consequently, the impedance of the sample (Hauser et al, 2001;Knobel and Pirota, 2002;Machado and Rezende, 1996;Mahdi et al, 2003;Pirota et al, 2002). Ribbons and wires of soft amorphous ferromagnetic alloys of the series Co 75-x Fe x Si 15 B 10 , which present low magnetorestriction, exhibit the giant magnetoimpedance (GMI) phenomenon.…”

Section: Gmi Effectmentioning

confidence: 99%

Sensitivity improvement of GMI magnetic and pressure transducers for biomedical measurements

Silva¹,

Gusmão²,

Barbosa

et al. 2011

RBEB

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This work presents an experimental study aiming the sensitivity optimization of Giant Magnetoimpedance (GMI) sensors, by means of properly choosing the values of their conditioning parameters. The optimized GMI sensors, together with the development of improved transduction electronic circuits, can lead to the sensitivity enhancement of GMI biomedical, pressure and magnetic transducer prototypes, previously developed by the research group at LaBioMet, PUC-Rio. Those prototypes are, respectively, aimed at the measurement of arterial pulse waves and the localization of magnetic foreign bodies inserted in the human body. Thus, the experimental characterization of GMI ribbon-shaped samples (Co 70 Fe 5 Si 15 B 10 ) was performed, as a function of the external magnetic field, including the experimental evaluation of the asymmetric GMI effect (AGMI). The parameters that affect the behavior of the GMI samples were experimentally analyzed, such as the DC level (0 mA to 100 mA) and frequency (100 kHz to 10 MHz) of the excitation current, as well as the samples length (1 cm, 3 cm, 5 cm and 15 cm). The conditioning parameters, experimentally identified, that optimize the GMI samples sensitivity lead to a maximum specific sensitivity of 0.84(8400 Ω ·T -1 ·cm -1 ). A new electronic circuit was developed for conditioning and reading of the GMI samples, which directly contributed to the performance enhancement of both transducers. The electronic circuits developed were evaluated supposing the operation of the GMI samples in their most sensitive region. Comparing to previously developed prototypes, the optimum sensitivity achieved for the new configuration of the GMI magnetic transducer increased about 9 times (from 0.12 mV/nT to 1.08 mV/nT), and the sensitivity of the modified pressure transducer increased approximately 7 times (from 1 mV/Pa to 7 mV/Pa). Keywords

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Giant magnetoimpedance sensors

Cited by 94 publications

References 3 publications

Giant Magnetoimpedance of Cube/Feconi Electroplated Wires: Focus on Angular Sensoric

Giant Magnetoimpedance of Cube/Feconi Electroplated Wires: Focus on Angular Sensoric

Giant magneto-impedance and its applications

Sensitivity improvement of GMI magnetic and pressure transducers for biomedical measurements

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