1. MgO Magnetic Tunnel Junction Electrical Current Sensor With Integrated Ru Thermal Sensor.
- Author
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Lopes, Antonio, Cardoso, Susana, Ferreira, Ricardo, Paz, Elvira, Deepak, Francis L., Sanchez, Jaime, Ramirez, Diego, Ravelo, Sergio I., and Freitas, Paulo P.
- Subjects
MAGNESIUM oxide ,MAGNETIC tunnelling ,ELECTRIC currents ,MAGNETIC sensors ,RUTHENIUM compounds ,THERMAL properties of metals ,TUNNEL magnetoresistance ,SURFACE roughness ,TEMPERATURE sensors ,TEMPERATURE measurements - Abstract
Full Wheatstone bridge electrical current sensor incorporating 114 MgO-based magnetic tunnel junction elements (3\times 30\ \mum^2) connected in series was produced for improved electrical robustness. To that end, magnetic tunnel junctions with R\timesA\sim 7\ k\Omega\ \mum^2, tunneling magnetoresistance of 200%, were produced. The sensor was designed with an integrated Ru thin film resistive thermal detector (RTD) for temperature drift monitoring and compensation. In order to achieve a full bridge signal, a U-shaped copper trace was placed under a printed circuit board (PCB) specifically designed for this type of device. The resulting device exhibit sensitivities of 63.9 V/Oe/A in a 75 Oe linear range biased with 1 mA current, providing a significantly advantageous alternative to AMR and GMR based bridges. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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