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Picotesla Magnetic Sensors For Low-Frequency Applications, Sy-Hwang Liou, Xiaolu Yin, Stephen Russek, Ranko Heindl, F. C. S. Da Silva, J. Moreland, David P. Pappas, L. Yuan, J. Shen
Picotesla Magnetic Sensors For Low-Frequency Applications, Sy-Hwang Liou, Xiaolu Yin, Stephen Russek, Ranko Heindl, F. C. S. Da Silva, J. Moreland, David P. Pappas, L. Yuan, J. Shen
Sy-Hwang Liou Publications
We demonstrate a simple low-power, magnetic sensor system suitable for high-sensitivity magnetic-field mapping, based on solid-state magnetic tunnel junction devices with minimum detectable fields in a 100 pT range at room temperature. In this paper, we discuss a method that uses multilayer thin films to improve the performance of the soft ferromagnetic layer in magnetoresistive sensor applications, by reducing the coercivity and/or improving the reversibility.We have used it in the design of our new magnetic sensor. This sensor has a sensitivity as high as 750%/mT. The magnetic sensor only dissipates 1 mW of power while operating under an applied voltage …