Magnetic-Field Dependence of the Noise in a Magnetoresistive Sensor Having MEMS Flux Concentrators

We report the dc and ac magnetic field dependence of the low-frequency noise in a microelectromechanical system (MEMS) flux concentrator device containing a giant magnetoresistance spin valve (SV). The noise is dominated by resistance fluctuations having a magnetic origin. Under nominally zero magne...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2006-10, Vol.42 (10), p.3306-3308
Main Authors: Ozbay, A., Nowak, E.R., Edelstein, A.S., Fischer, G.A., Nordman, C.A., Shu Fan Cheng
Format: Article
Language:English
Subjects:
Concentrators
Cross-disciplinary physics: materials science
rheology
Devices
Exact sciences and technology
Field sensor
Fluctuations
Flux
flux concentrator
Giant magnetoresistance
Low-frequency noise
Magnetic fields
Magnetic flux
Magnetic noise
Magnetic sensors
Magnetism
magnetometer
magnetoresistance
Materials science
Microelectromechanical systems
Micromechanical devices
Noise
Other topics in materials science
Physics
Sensors
Spin valves
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Summary:We report the dc and ac magnetic field dependence of the low-frequency noise in a microelectromechanical system (MEMS) flux concentrator device containing a giant magnetoresistance spin valve (SV). The noise is dominated by resistance fluctuations having a magnetic origin. Under nominally zero magnetic-field biasing conditions, the noise power is large and varies rapidly with small changes in magnetic field. Metastability between distinct resistive states is observed and can be suppressed with the application of a moderate longitudinal field. Stationary flux concentrators do not contribute excess noise, rather the dominant source of noise is the SVs themselves. This result indicates that the device is likely to increase the sensitivity of many magnetic sensors at low frequencies by orders of magnitude
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2006.879752