Magnetic noise in a low-power picotesla magnetoresistive sensor

S. H. Liou, David Sellmyer, Stephen E. Russek, Ranko Heindl, F. C.S. Da Silva, John Moreland, David P. Pappas, L. Yuan, J. Shen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

14 Scopus citations


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 of the MTJ sensors in high magnetic field and a hydrogen environment, and (3) increasing the signal by the use of external low-noise magnetic flux concentrators. The field noise of our prototype magnetic sensor is approximately 4.5 pT/Hz1/2 at 1 kHz, and 222 pT/Hz1/2 at 1 Hz at room temperature. The magnetic sensor dissipates about 2 mW of power while operating at an applied voltage of 2 V.

Original languageEnglish (US)
Title of host publicationIEEE Sensors 2009 Conference - SENSORS 2009
Number of pages4
StatePublished - 2009
EventIEEE Sensors 2009 Conference - SENSORS 2009 - Christchurch, New Zealand
Duration: Oct 25 2009Oct 28 2009

Publication series

NameProceedings of IEEE Sensors


OtherIEEE Sensors 2009 Conference - SENSORS 2009
Country/TerritoryNew Zealand

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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