Hybrid AMR/PHR ring sensor

Oh, Sung‐Yong; Patil, Pramod; Hung, Tran Quang; Lim, Byunghwa; Takahashi, M.; Kim, Dong Young; Kim, CheolGi

doi:10.1016/j.ssc.2011.05.049

Cited by 28 publications

(11 citation statements)

References 15 publications

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“…The scaling of the sensor signal with the sensor geometry for the detection of external magnetic fields has been demonstrated previously. 19,25,26 However, the present study is the first showing designs optimized for the detection of magnetic beads magnetized by the sensor self-field. In addition to the low-field sensitivity, the maximum allowed sensor bias current plays an important role as the self-field signal is proportional to the current squared.…”

Section: Consequences For Applicationsmentioning

confidence: 89%

Planar Hall effect bridge geometries optimized for magnetic bead detection

Østerberg

Rizzi

Henriksen

et al. 2014

Journal of Applied Physics

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Articles you may be interested inNovel designs of planar Hall effect bridge sensors optimized for magnetic bead detection are presented and characterized. By constructing the sensor geometries appropriately, the sensors can be tailored to be sensitive to an external magnetic field, the magnetic field due to beads being magnetized by the sensor self-field or a combination thereof. The sensors can be made nominally insensitive to small external magnetic fields, while being maximally sensitive to magnetic beads, magnetized by the sensor self-field. Thus, the sensor designs can be tailored towards specific applications with minimal influence of external variables. Three different sensor designs are analyzed theoretically. To experimentally validate the theoretical signals, two sets of measurements are performed. First, the sensor signals are characterized as function of an externally applied magnetic field. Then, measurements of the dynamic magnetic response of suspensions of magnetic beads with a nominal diameter of 80 nm are performed. Furthermore, a method to amplify the signal by appropriate combinations of multiple sensor segments is demonstrated. V C 2014 AIP Publishing LLC.

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Section: Consequences For Applicationsmentioning

confidence: 89%

Planar Hall effect bridge geometries optimized for magnetic bead detection

Østerberg

Rizzi

Henriksen

et al. 2014

Journal of Applied Physics

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“…Figure 4 shows the microphotograph of the PHR sensor and its performance. This PHR sensor has several layers consisting of Fe∙Mn, Cu, Ni∙Fe and passivation layers so that the sensitivity can be maximized [ 25 ]. The diameter and the number of turns of the PHR sensor affect the sensitivity and the dynamic range of the current sensor.…”

Section: Design and Structure Of Current Sensormentioning

confidence: 99%

High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor

Lee

Hong

Park

et al. 2018

Sensors

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In this paper, we propose a high accuracy open-type current sensor with a differential Planar Hall Resistive (PHR) sensor. Conventional open-type current sensors with magnetic sensors are usually vulnerable to interference from an external magnetic field. To reduce the effect of an unintended magnetic field, the proposed design uses a differential structure with PHR. The differential structure provides robust performance to unwanted magnetic flux and increased magnetic sensitivity. In addition, instead of conventional Hall sensors with a magnetic concentrator, a newly developed PHR with high sensitivity is employed to sense horizontal magnetic fields. The PHR sensor and read-out integrated circuit (IC) are integrated through a post-Complementary metal-oxide-semiconductor (CMOS) process using multi-chip packaging. The current sensor is designed to measure a 1 A current level. The measured performance of the designed current sensor has a 16 kHz bandwidth and a current nonlinearity of under ±0.5%.

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“…Recent studies on PHE sensors have focused on increasing/optimizing their magnetic field sensitivity and resolution either by changing sensor structure or its geometry [8][9][10][11][12]. In the literature, several types of exchange-biased sensor structures have already been studied such as NiFe/IrMn bilayers [13][14][15], NiFe/X/IrMn (X: Cu, Au, Pt) trilayers [8,12,16], and NiFe/Cu/NiFe/IrMn spin-valves [17,18].…”

Section: Introductionmentioning

confidence: 99%

Tuning the magnetic field sensitivity of planar Hall effect sensors by using a Cr spacer layer in a NiFe/Cr/IrMn trilayer structure

Pişkin¹,

Akdoğan²

2020

Turk J Phys

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Planar Hall effect (PHE)-based magnetic field sensors have recently received considerable attention due to their fascinating properties. For the NiFe/spacer/IrMn trilayer PHE sensor structures, tuning the exchange bias via a spacer layer is very crucial due to its direct effects on the sensor's magnetic field sensitivity. Here the effect of Cr spacer layer thickness on PHE sensitivity and exchange bias is investigated in NiFe (10 nm)/Cr (t Cr ) /IrMn (20 nm) trilayer structures where the t Cr varied between 0.0 nm and 1 nm with a step of 0.1 nm. As the t Cr increased, we observed a fast decrease in exchange bias field. When the thickness of Cr spacer layer increased up to 0.7 nm, a maximum sensitivity of 4.4 µ V/(Oe • mA) was obtained. Besides, sensor voltage exhibited ±100 nV noise level. With this noise level, a 1.6 µ T magnetic field resolution was achieved.

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Hybrid AMR/PHR ring sensor

Cited by 28 publications

References 15 publications

Planar Hall effect bridge geometries optimized for magnetic bead detection

Planar Hall effect bridge geometries optimized for magnetic bead detection

High Accuracy Open-Type Current Sensor with a Differential Planar Hall Resistive Sensor

Tuning the magnetic field sensitivity of planar Hall effect sensors by using a Cr spacer layer in a NiFe/Cr/IrMn trilayer structure

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