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PUBLICATIONS

Magnetic Noise in a Low-Power Picotesla Magnetoresistive Sensor

Published

Author(s)

Stephen E. Russek, Lu Yuan, Sean Halloran, Fabio C. da Silva, David P. Pappas, John M. Moreland, Sy-hwang Liou, Rui Zhang

Abstract

We present a design of a low power, compact, magnetoresistive sensor. The key features of the design are(1) decreasing the noise by the use of a 64 element magnetic tunnel junction (MTJ) bridge,(2) reducing the magnetic noise by annealing the MTJ sensors in high magnetic field and a hydrogen environment, and (3) increasing signal by the use of external low-noise magnetic flux concentrators. The field noise of our prototype magnetic sensor is approximately 1 pT/Hz1/2 at 1 kHz, 5 pT/Hz1/2 at 10 Hz, and 50 pT/Hz1/2 at 1 Hz at room temperature. The magnetic sensor only dissipates 15 mW of power while operating.
Citation
Applied Physics Letters
Pub Type
Journals

Download Paper

DOI Link

Keywords

magnetic sensor, magnetic tunneling junction, magnetic concentrators, magnetic noise
Sensors

Citation

Russek, S. , Yuan, L. , Halloran, S. , Da, F. , Pappas, D. , Moreland, J. , Liou, S. and Zhang, R. (2009), Magnetic Noise in a Low-Power Picotesla Magnetoresistive Sensor, Applied Physics Letters, [online], https://doi.org/10.1109/ICSENS.2009.5398414 (Accessed October 22, 2025)

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Created October 24, 2009, Updated October 13, 2020
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