A magnetic sensor based on a nanometric spin transfer torque magnetic tunnel junction suitable for monolithic integration
Résumé
This paper presents a magnetic sensor which sensing element is based on a spin transfer torque magnetic tunnel junction of less than 100 nanometers in diameter. This sensing element is to our knowledge one of the smallest ever reported. It is several orders of magnitude smaller than any other high-performance magnetometers. The design of the conditioning and signal processing electronics associated to the sensing element makes the proposed sensor suitable for monolithic integration. The sensor exhibits a resolution of 12.84 nT, a bandwidth of 400 Hz and a sensitivity of 77,830 LSB/mT. This is comparable with best in class commercially available monolithic magnetometers. Furthermore, its dynamic range up to 120 mT outperforms the typical ranges of magnetoresistive sensors. Besides offering a drastical miniaturization, the proposed sensor combines both high resolution and high dynamic range and can possibly fill a gap between Hall effect sensors and magnetoresistive sensors. Further developments are required to reduce the noise level.
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