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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.
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 8, 2025)