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NSF-MRSEC

Low-Power Picotesla Magnetoresistive Sensor. S. H. Liou and David Sellmyer Nebraska MRSEC Stephen E. Russek, Ranko Heindl, F. C. S. Da Silva, John Moreland, David P. Pappas National Institute of Standards and Technology, Boulder, CO L. Yuan and J. Shen

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NSF-MRSEC

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  1. Low-Power Picotesla Magnetoresistive Sensor S. H. Liou and David Sellmyer Nebraska MRSEC Stephen E. Russek, Ranko Heindl, F. C. S. Da Silva, John Moreland, David P. Pappas National Institute of Standards and Technology, Boulder, CO L. Yuan and J. Shen Western Digital Corporation, Fremont, CA We have developed a low power, compact, magnetoresistive sensor that combines a 64 element magnetic tunnel junction bridge and a set of low noise magnetic flux concentrators. Sensitivity in the range of a few picotesla at 1 kHz has been achieved. Magnetic field sensitivities of our prototype magnetic sensor are about 4.5 pT/Hz1/2 at 1 kHz, and 222 pT/Hz1/2 at 1 Hz. The magnetic sensor only dissipates 6 mW of power while operating. Our prototype magnetoresistive sensor is operated by a set of coin-cell (3 volts) batteries. The two bulk pieces lying on both sides of the MR sensor are magnetic flux concentrators. The MTJs was arranged as an asymmetric bridge in between the two magnetic flux concentrators. The operating power is less than 6 mW. These programs are supported by the National Science Foundation, Division of Materials Research, Materials Research Science and Engineering Program, Grant 0820521. NSF-MRSEC

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