Optimization of 2DEG InAs/GaSb Hall Sensors for Single Particle Detection

Magnetic sensors having high spatial and stray field resolutions are key elements in many biomedical applications. One promising magnetic detector is a microsized Hall sensor. We present our first results in realising a measurement system based on a Hall sensor made of an asymmetric 2DEG InAs/GaSb-b...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2008-11, Vol.44 (11), p.4480-4483
Main Authors: Kazakova, O., Gallop, J.C., Cox, D.C., Brown, E., Cuenat, A., Suzuki, K.
Format: Article
Language:English
Subjects:
Biomedical measurements
Biosensors
Cross-disciplinary physics: materials science
rheology
Detectors
Exact sciences and technology
Hall coefficient
Hall sensor
InAs/GaSb heterostructures
Magnetic field measurement
Magnetic noise
Magnetic properties
Magnetic sensors
Magnetism
Materials science
noise measurements
Other topics in materials science
Physics
Sensor phenomena and characterization
Sensor systems
Spatial resolution
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Summary:Magnetic sensors having high spatial and stray field resolutions are key elements in many biomedical applications. One promising magnetic detector is a microsized Hall sensor. We present our first results in realising a measurement system based on a Hall sensor made of an asymmetric 2DEG InAs/GaSb-based heterostructure. The work aims to investigate magnetotransport properties of such Hall sensors and optimize their performance. In particular, we focus on examining noise characteristics of the sensor as it allows us to determine and improve the device sensitivity. We show that in investigated devices a magnetic field sensitivity of better than 0.5 mu T/Hz 1/2 (corresponding to a magnetization detection threshold of 2times10 5 mu B /Hz 1/2 ) should be readily achievable at room temperature and at a frequency of around 3 kHz.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2008.2003507