A High-Resolution Planar Hall Effect Magnetometer for Ultra-Low Frequencies

Asaf Grosz; Vladislav Mor; Shai Amrusi; Igor Faivinov; Eugene Paperno; Lior Klein

doi:10.1109/jsen.2016.2523463

A High-Resolution Planar Hall Effect Magnetometer for Ultra-Low Frequencies

Asaf Grosz, Vladislav Mor, Shai Amrusi, Igor Faivinov, Eugene Paperno, Lior Klein

Department of Physics

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Recent reports have demonstrated field resolutions of planar Hall effect magnetometers in the picotesla range. Here, we report a significant improvement in the field resolution of these sensors by decreasing their preamplifier white noise and the sensing element 1/f noise. We design, build, and test a miniature transformer-matched amplifier with a record noise level of 200 pV/ Hz and improve the fabrication process of the sensing element to increase its volume and reduce its associated 1/f noise. The magnetometer exhibits a magnetic resolution of ∼ 200 pT/ Hz at 1 Hz and ∼ 600 pT/ Hz at 0.1 Hz. These values are threefold better than previously reported results. The obtained resolution may enable applications for which high-end magnetometers, such as fluxgates, are currently used. We discuss routes for the further improvement of the magnetic field resolution.

Original language	English
Article number	7395273
Pages (from-to)	3224-3230
Number of pages	7
Journal	IEEE Sensors Journal
Volume	16
Issue number	9
DOIs	https://doi.org/10.1109/jsen.2016.2523463
State	Published - 1 May 2016

Bibliographical note

Publisher Copyright:
© 2016 IEEE.

Keywords

Low noise amplifier
Magnetic sensor
Magnetometer
Planar Hall effect
Transformer noise matching

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10.1109/jsen.2016.2523463

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abstract = "Recent reports have demonstrated field resolutions of planar Hall effect magnetometers in the picotesla range. Here, we report a significant improvement in the field resolution of these sensors by decreasing their preamplifier white noise and the sensing element 1/f noise. We design, build, and test a miniature transformer-matched amplifier with a record noise level of 200 pV/ Hz and improve the fabrication process of the sensing element to increase its volume and reduce its associated 1/f noise. The magnetometer exhibits a magnetic resolution of ∼ 200 pT/ Hz at 1 Hz and ∼ 600 pT/ Hz at 0.1 Hz. These values are threefold better than previously reported results. The obtained resolution may enable applications for which high-end magnetometers, such as fluxgates, are currently used. We discuss routes for the further improvement of the magnetic field resolution.",

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AU - Paperno, Eugene

AU - Klein, Lior

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A High-Resolution Planar Hall Effect Magnetometer for Ultra-Low Frequencies

Abstract

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Keywords

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