Magnetoresistive sensors for nondestructive evaluation (Invited Paper)

Jander, Albrecht; Smith, Carl H.; Schneider, Robert

doi:10.1117/12.601826

Cited by 80 publications

(41 citation statements)

References 33 publications

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“…The use of a magneto-resistive device as the magnetic field sensor enables efficient monitoring of magnetic fields at frequencies from DC to megahertz. While the low frequencies capabilities of magneto-resisitive sensor based eddy current probes have been presented in the past [1][2][3][4][5], the current design adds capabilities for high frequency high spatial resolution of surface breaking defects. Along with the probe design, finite element modeling and experimental verification of the high frequency operation of the device has been presented.…”

Section: Discussionmentioning

confidence: 99%

“…The use of magneto-resistive sensors in the fabrication of novel eddy current probes has been performed by several groups over the last decade [1][2][3][4][5]. The focus of these efforts has been the development of sensors that can operate at very low frequencies without a loss of sensitivity to the magnetic field, leading to the development of systems with flaw detection capabilities at centimeter-scale flaw depths [1][2].…”

Section: Introductionmentioning

confidence: 99%

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Development and Application of Wide Bandwidth Magneto-Resistive Sensor Based Eddy Current Probe

Wincheski

Simpson

2011

AIP Conference Proceedings

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ABSTRACT. The integration of magneto-resistive sensors into eddy current probes can significantly expand the capabilities of conventional eddy current nondestructive evaluation techniques. The room temperature solid-state sensors have typical bandwidths in the megahertz range and resolutions of tens of microgauss. The low frequency sensitivity of magneto-resistive sensors has been capitalized upon in previous research to fabricate very low frequency eddy current sensors for deep flaw detection in multilayer conductors. In this work a modified probe design is presented to expand the capabilities of the device. The new probe design incorporates a dual induction source enabling operation from low frequency deep flaw detection to high frequency high resolution near surface material characterization. Applications of the probe for the detection of localized near surface conductivity anomalies are presented. Finite element modeling of the probe is shown to be in good agreement with experimental measurements.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development and Application of Wide Bandwidth Magneto-Resistive Sensor Based Eddy Current Probe

Wincheski

Simpson

2011

AIP Conference Proceedings

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“…Interested readers are referred to papers by Jander et al [158], and Tian and his research groups [159][160][161]. For information on high spatial resolution, magnetic field induced thermal imaging techniques, interested readers are referred to paper by Cui et al [162].…”

Section: Potential Applicationsmentioning

confidence: 99%

Ferromagnetic Multilayers: Magnetoresistance, Magnetic Anisotropy, and Beyond

2016

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Abstract:Obtaining highly sensitive ferromagnetic, FM, and nonmagnetic, NM, multilayers with a large room-temperature magnetoresistance, MR, and strong magnetic anisotropy, MA, under a small externally applied magnetic field, H, remains a subject of scientific and technical interest. Recent advances in nanofabrication and characterization techniques have further opened up several new ways through which MR, sensitivity to H, and MA of the FM/NM multilayers could be dramatically improved in miniature devices such as smart spin-valves based biosensors, non-volatile magnetic random access memory, and spin transfer torque nano-oscillators. This review presents in detail the fabrication and characterization of a few representative FM/NM multilayered films-including the nature and origin of MR, mechanism associated with spin-dependent conductivity and artificial generation of MA. In particular, a special attention is given to the Pulsed-current deposition technique and on the potential industrial applications and future prospects. FM multilayers presented in this review are already used in real-life applications such as magnetic sensors in automobile and computer industries. These material are extremely important as they have the capability to efficiently replace presently used magnetic sensors in automobile, electronics, biophysics, and medicine, among many others.

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“…In addition, they are manufactured by thin-film processing technology. This has dramatically driven down the price per sensor, making them attractive for low-cost applications [17]. They have been used successfully in detecting underground power cables [18].…”

Section: Introductionmentioning

confidence: 99%