Towards picoTesla Magnetic Field Detection Using a GMR-MEMS Hybrid Device

We are developing a novel MEMS-magnetoresistive hybrid device aimed at ultra low magnetic field detection. The hybrid device combines magnetoresistive (MR) sensors and AlN based piezoelectric MEMS resonators. The MR sensor can achieve highly sensitive magnetic field detection but suffers from high m...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2012-11, Vol.48 (11), p.4115-4118
Main Authors: Guedes, A., Jaramillo, G., Buffa, C., Vigevani, G., Cardoso, S., Leitao, D. C., Freitas, P. P., Horsley, D. A.
Format: Article
Language:English
Subjects:
1/f noise cancelation
Amplitude modulation
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Frequency modulation
Low magnetic field sensing
Magnetic devices
Magnetic recording
Magnetism
magnetoresistive sensors
Materials science
Micromechanical devices
Noise
Other topics in materials science
Physics
piezoelectric MEMS
Sensitivity
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Summary:We are developing a novel MEMS-magnetoresistive hybrid device aimed at ultra low magnetic field detection. The hybrid device combines magnetoresistive (MR) sensors and AlN based piezoelectric MEMS resonators. The MR sensor can achieve highly sensitive magnetic field detection but suffers from high magnetic and electrical 1/ f noise, limiting its applicability for dc and low-frequency field detection. We overcome this problem by using two piezoelectric cantilevers with integrated magnetic flux concentrators (MFC) to mechanically modulate the external magnetic fields into the high frequency region where the 1/ f noise in the MR device vanishes. In this paper we report our fabrication approach and preliminary characterization of the hybrid device.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2012.2203297