GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation

Ch Ravi Kumar; T. S. Abhilash; B. P.C. Rao; T. Jayakumar; G. Rajaram

doi:10.3233/978-1-60750-968-4-241

GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation

Ch Ravi Kumar, T. S. Abhilash, B. P.C. Rao, T. Jayakumar, G. Rajaram^*

^*Corresponding author for this work

Not published at VTT

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

Abstract

Hall sensors are fabricated from GaAs/AlGaAs based heterostructures. The sensors are characterized for sensitivity using A.C and D.C. excitation techniques w.r.to a known magnetic field in the range of 0-100Oe. Sensitivities of the order of 1000V/AT are obtained with a low variation of 0.15% in the temperature range of 30°C-100°C. A.C excitation (30Hz to 1 kHz) for the sensor current and phase-sensitive detection of the Hall Voltage are used to eliminate thermo-emfs and its drift with a consequent improvement in data acquisition rates of >50% over that of D.C excitation. This improves scan rates in applications such as magnetic flux leakage (MFL) measurements. The sensitivity is independent of the frequency of excitation as expected; however, the zero-field Hall voltage 'offset' value is found to have small frequency dependence.

Original language	English
Title of host publication	Electromagnetic Nondestructive Evaluation (XV)
Editors	B.P.C. Rao, T. Jayakumar, Baldev Raj, Krishnan Balasubramanian
Publisher	IOS Press
Pages	241-246
Number of pages	6
ISBN (Print)	978-160750967-7
DOIs	https://doi.org/10.3233/978-1-60750-968-4-241
Publication status	Published - 2012
MoE publication type	Not Eligible

Publication series

Series	Studies in Applied Electromagnetics and Mechanics
Volume	36
ISSN	1383-7281

Keywords

A.C. excitation
GaAs/AlGaAs
Hall sensor
Magnetic Flux Leakage

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10.3233/978-1-60750-968-4-241

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title = "GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation",

abstract = "Hall sensors are fabricated from GaAs/AlGaAs based heterostructures. The sensors are characterized for sensitivity using A.C and D.C. excitation techniques w.r.to a known magnetic field in the range of 0-100Oe. Sensitivities of the order of 1000V/AT are obtained with a low variation of 0.15\% in the temperature range of 30°C-100°C. A.C excitation (30Hz to 1 kHz) for the sensor current and phase-sensitive detection of the Hall Voltage are used to eliminate thermo-emfs and its drift with a consequent improvement in data acquisition rates of >50\% over that of D.C excitation. This improves scan rates in applications such as magnetic flux leakage (MFL) measurements. The sensitivity is independent of the frequency of excitation as expected; however, the zero-field Hall voltage 'offset' value is found to have small frequency dependence.",

keywords = "A.C. excitation, GaAs/AlGaAs, Hall sensor, Magnetic Flux Leakage",

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Ravi Kumar, C, Abhilash, TS, Rao, BPC, Jayakumar, T & Rajaram, G 2012, GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation. in BPC Rao, T Jayakumar, B Raj & K Balasubramanian (eds), Electromagnetic Nondestructive Evaluation (XV). IOS Press, Studies in Applied Electromagnetics and Mechanics, vol. 36, pp. 241-246. https://doi.org/10.3233/978-1-60750-968-4-241

GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation. / Ravi Kumar, Ch; Abhilash, T. S.; Rao, B. P.C. et al.
Electromagnetic Nondestructive Evaluation (XV). ed. / B.P.C. Rao; T. Jayakumar; Baldev Raj; Krishnan Balasubramanian. IOS Press, 2012. p. 241-246 (Studies in Applied Electromagnetics and Mechanics, Vol. 36).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific

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T1 - GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation

AU - Ravi Kumar, Ch

AU - Abhilash, T. S.

AU - Rao, B. P.C.

AU - Jayakumar, T.

AU - Rajaram, G.

PY - 2012

Y1 - 2012

N2 - Hall sensors are fabricated from GaAs/AlGaAs based heterostructures. The sensors are characterized for sensitivity using A.C and D.C. excitation techniques w.r.to a known magnetic field in the range of 0-100Oe. Sensitivities of the order of 1000V/AT are obtained with a low variation of 0.15% in the temperature range of 30°C-100°C. A.C excitation (30Hz to 1 kHz) for the sensor current and phase-sensitive detection of the Hall Voltage are used to eliminate thermo-emfs and its drift with a consequent improvement in data acquisition rates of >50% over that of D.C excitation. This improves scan rates in applications such as magnetic flux leakage (MFL) measurements. The sensitivity is independent of the frequency of excitation as expected; however, the zero-field Hall voltage 'offset' value is found to have small frequency dependence.

AB - Hall sensors are fabricated from GaAs/AlGaAs based heterostructures. The sensors are characterized for sensitivity using A.C and D.C. excitation techniques w.r.to a known magnetic field in the range of 0-100Oe. Sensitivities of the order of 1000V/AT are obtained with a low variation of 0.15% in the temperature range of 30°C-100°C. A.C excitation (30Hz to 1 kHz) for the sensor current and phase-sensitive detection of the Hall Voltage are used to eliminate thermo-emfs and its drift with a consequent improvement in data acquisition rates of >50% over that of D.C excitation. This improves scan rates in applications such as magnetic flux leakage (MFL) measurements. The sensitivity is independent of the frequency of excitation as expected; however, the zero-field Hall voltage 'offset' value is found to have small frequency dependence.

KW - A.C. excitation

KW - GaAs/AlGaAs

KW - Hall sensor

KW - Magnetic Flux Leakage

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SN - 978-160750967-7

T3 - Studies in Applied Electromagnetics and Mechanics

SP - 241

EP - 246

BT - Electromagnetic Nondestructive Evaluation (XV)

A2 - Rao, B.P.C.

A2 - Jayakumar, T.

A2 - Raj, Baldev

A2 - Balasubramanian, Krishnan

PB - IOS Press

ER -

Ravi Kumar C, Abhilash TS, Rao BPC, Jayakumar T, Rajaram G. GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation. In Rao BPC, Jayakumar T, Raj B, Balasubramanian K, editors, Electromagnetic Nondestructive Evaluation (XV). IOS Press. 2012. p. 241-246. (Studies in Applied Electromagnetics and Mechanics, Vol. 36). doi: 10.3233/978-1-60750-968-4-241

GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation

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