Depth-resolved eddy-current detection with GMR magnetometer

Jeng, Jin-Tsong; Lee, Guan-Shiun; Liao, Wen-Chu; Shu, Chia-Lun

doi:10.1016/j.jmmm.2006.02.070

Cited by 16 publications

(4 citation statements)

References 7 publications

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“…Flipping minimizes scale factor drift, maintains the sensor in a low noise state and also permits electronic compensation of the sensor offset. While closed loop operation for GMR and SDT sensors is possible (Jeng et al 2006), because these sensors rely on magneto-transport through alternately magnetized structures rather than a single piece of bulk material, it is not currently possible to simultaneously run these sensors in a flipped and feedback mode.…”

Section: Discussionmentioning

confidence: 99%

Magnetoresistive magnetometer for space science applications

Brown

Beek

Carr

et al. 2012

Meas. Sci. Technol.

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Measurement of the in situ dc magnetic field on space science missions is most commonly achieved using instruments based on fluxgate sensors. Fluxgates are robust, reliable and have considerable space heritage; however, their mass and volume are not optimized for deployment on nano or picosats. We describe a new magnetometer design demonstrating science measurement capability featuring significantly lower mass, volume and to a lesser extent power than a typical fluxgate. The instrument employs a sensor based on anisotropic magnetoresistance (AMR) achieving a noise floor of less than 50 pT Hz−1/2 above 1 Hz on a 5 V bridge bias. The instrument range is scalable up to ±50 000 nT and the three-axis sensor mass and volume are less than 10 g and 10 cm3, respectively. The ability to switch the polarization of the sensor's easy axis and apply magnetic feedback is used to build a driven first harmonic closed loop system featuring improved linearity, gain stability and compensation of the sensor offset. A number of potential geospace applications based on the initial instrument results are discussed including attitude control systems and scientific measurement of waves and structures in the terrestrial magnetosphere. A flight version of the AMR magnetometer will fly on the TRIO-CINEMA mission due to be launched in 2012.

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Section: Discussionmentioning

confidence: 99%

Magnetoresistive magnetometer for space science applications

Brown

Beek

Carr

et al. 2012

Meas. Sci. Technol.

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“…Dolabdijan et al [10] used a GMR-PEC system consisting of two excitation coils for the testing of sub-surface defects. Since GMR sensors are frequency-independent compared to coil-systems, they are suited for low-frequency applications in order to test buried defects 10 mm beneath the surface [11]. FIGURE 1.…”

Section: Eddy Current Testingmentioning

confidence: 99%

Benefits of GMR sensors for high spatial resolution NDT applications

Pelkner¹,

Stegemann²,

Sonntag³

et al. 2018

AIP Conference Proceedings

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“…One of the most common applications of GMR is in magnetoelectronic devices such as magnetic field sensors [1], magnetoresistance random access memories, magnetoresistance transistors. GMR sensors have found applications in hard drives [2][3][4], position detection, nondestructive evaluations [5][6][7], and conductive microbead detection [8]. Applications in utilization of GMR chips whose surface is bound with biological tagged markers can be found in [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Micron size GMR magnetic sensor with needle structure

Yamada¹,

Haraszczuk²,

Kakikawa³

et al. 2012

AIP Conference Proceedings

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ABSTRACT. The work presents inimitable shaped needle type probe with spin valve giant magnetoresistance (SV-GMR) elements. Sensitive elements with 75 µm width are connected in the Wheatstone bridge structure. The length of the needle is 20-30 mm and its cross section is square. The magnetic sensor probe has the advantage of micron order spatial resolution. The needle type probe works as a gradient meter which concurrently suppresses the influence of externally applied field and detects magnetic fields emanating from nano or micro order size sources. Sensing elements present high sensitivity 260 µV / µT and are capable of detecting the magnetic fields in order of few nT. SV-GMR elements present flat amplitude and phase characteristics in wide frequency range. The novel characteristicsof the probe allow it to be utilized in detection of the in-phase and out of phase signal components. An additional merit of this design is extremely small liftoff height between sensing element and the source of magnetic field. The SV-GMR elements are isolated only by very thin protection layer (a few µm), that gives opportunity to apply the probe in biological (in vivo) experiments, and in non destructive evaluation of current detection. The needle shape allows the sensing element toapproach the examined materials in a distance of few ten µm.

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Depth-resolved eddy-current detection with GMR magnetometer

Cited by 16 publications

References 7 publications

Magnetoresistive magnetometer for space science applications

Magnetoresistive magnetometer for space science applications

Benefits of GMR sensors for high spatial resolution NDT applications

Micron size GMR magnetic sensor with needle structure

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