2-Axis Magnetometers Based on Full Wheatstone Bridges Incorporating Magnetic Tunnel Junctions Connected in Series
| Autor: | Paulo P. Freitas, J. Germano, Elvira Paz, Leonel Sousa, J. F. Ribeiro, Ricardo Ferreira |
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| Rok vydání: | 2012 |
| Předmět: |
Wheatstone bridge
Reference structure Materials science business.industry Magnetometer Annealing (metallurgy) Magnetic tunnelling Electronic Optical and Magnetic Materials law.invention Magnetic field Nuclear magnetic resonance law Compass Full bridge Optoelectronics Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Magnetics. 48:4107-4110 |
| ISSN: | 1941-0069 0018-9464 |
| DOI: | 10.1109/tmag.2012.2202381 |
| Popis: | Full Wheatstone Bridge incorporating a serially connected ensemble of Magnetic tunnel junctions was produced, targeting an application as a magnetic field compass. To that end, MTJs with RxA ~ 10kΩ μm2 TMR~150-200%, Hf = 5 Oe and Hf = 5 Oe were produced. In order to achieve a full bridge signal, two stacks with an asymmetric SAF reference structure where used to produce MTJs with opposite dR/dH upon annealing in the same substrate. The resulting Bridges exhibit sensitivities between 13.5-32 mV/V/Oe depending on the field range and provide a significantly advantageous alternative to AMR and GMR based bridges. |
| Databáze: | OpenAIRE |
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