Magnetoresistive Sensors

Kawai, T.; Sagara, T.; Syonowaki, Y.

doi:10.1109/tjmj.1993.4565647

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…The rotation angle of the magnetization direction, T, is expressed by where H k is an anisotropic magnetic field. The resistance change 'R is detected as a change of voltage induced by I, namely, 'V, expressed by where 'R / R 0 represents the MR ratio [2]. First, the dc ratio of an anisotropic MR [3] for a Permalloy film was measured.…”

Section: Mr Propertymentioning

confidence: 99%

“…When a constant current I flows along the easy axis of magnetization of a ferromagnetic thin film and an external magnetic field H y is applied along the hard axis of magnetization, the electrical resistance of the film changes as the direction of the magnetization changes, as shown in where 'R / R 0 represents the MR ratio [2]. First, the dc ratio of an anisotropic MR [3] for a Permalloy film was measured.…”

Section: Mr Propertymentioning

confidence: 99%

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High-frequency measurements of the magnetoresistance effect of thin films

Yoshizawa¹,

Nakane²,

Negishi³

et al. 2000

Elect. Eng. Jpn.

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The ac magnetoresistance of thin films at frequencies up to 10 kHz was successfully measured. Patterned electrodes with mechanical flexibility were pressed onto the film surface by using a rubber pad. Induction noises were reduced considerably in comparison to the conventional four‐electrode method. A seven‐electrode system was developed to prevent high‐frequency induction noise, typically induced by leakage flux from the sample edges. It was found that the seven‐electrode system enables magnetoresistance measurements with little induction noise at frequencies up to 10 kHz. © 2000 Scripta Technica, Electr Eng Jpn, 132(2): 1–5, 2000

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Section: Mr Propertymentioning

confidence: 99%

Section: Mr Propertymentioning

confidence: 99%

High-frequency measurements of the magnetoresistance effect of thin films

Yoshizawa¹,

Nakane²,

Negishi³

et al. 2000

Elect. Eng. Jpn.

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“…AMR sensors are based on the anisotropic magnetoresistance effect and are available for a wide range of applications [6], [7]. Most of these sensors are made of a nickel-iron (permalloy) thin film deposited onto a silicon substrate and is patterned as a resistive strip [8], [9].…”

mentioning

confidence: 99%

“…These sensors are composed of pairs of detection and excitation coils in a first-order gradiometric configuration to provide good signal-to-noise ratio. Considering their features, AMR sensors can detect constant and time-varying magnetic fields [7], [13], [14], while ACB sensors are able to measure alternating magnetic field and to monitor ferromagnetic particles that were not previously magnetized [5], [11], [12]. The association between AMR and ACB consists of replacing the ACB detection coils by AMR sensors.…”

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confidence: 99%

Development of an AMR-ACB Array for Gastrointestinal Motility Studies

Paixão

Corá

Américo

et al. 2012

IEEE Trans. Biomed. Eng.

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The association between anisotropic magnetoresistive (AMR) sensor and AC biosusceptometry (ACB) to evaluate gastrointestinal motility is presented. The AMR-ACB system was successfully characterized in a bench-top study, and in vivo results were compared with those obtained by means of simultaneous manometry. Both AMR-ACB and manometry techniques presented high temporal cross correlation between the two periodicals signals . The contraction frequencies using AMR-ACB were 73.9 ± 7.6 mHz and using manometry were 73.8 ± 7.9 mHz during the baseline . The amplitude of contraction using AMR-ACB was 396 ± 108 μT·s and using manometry were 540 ± 198 mmHg·s during the baseline. The amplitudes of signals for AMR-ACB and manometric recordings were similarly increased to 86.4% and 89.3% by neostigmine, and also decreased to 27.2% and 21.4% by hyoscine butylbromide in all animals, respectively. The AMR-ACB array is nonexpensive, portable, and has high-spatiotemporal resolution to provide helpful information about gastrointestinal tract.

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