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5 October 2023 Amplifying magnetic sensor sensitivity with ultra-high gain flux concentrator
Claire Baraduc, Samuel Manceau, Thomas Brun, Clarisse Ducruet, Philippe Sabon, Claude Cavoit, Guillaume Jannet, Ioan-Lucian Prejbeanu, Matthieu Kretzschmar
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Proceedings Volume PC12656, Spintronics XVI; PC126560Z (2023) https://doi.org/10.1117/12.2677610
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
To develop sensors for sub-nT magnetic field detection, we fabricate micron-sized magnetic tunnel junctions with symmetric response. Their sensitivity is improved by carefully tuning the exchange field of the soft-pinned free-layer. Furthermore, the use of a flux concentrator significantly enhances the sensor sensitivity at low field. The flux concentrator design is optimized to reach high gain values thanks to a particularly narrow air-gap of 10 µm. We demonstrate an amplification gain of a factor 350 with a flux concentrator realized by electro-chemical deposition. This result opens the way to the development of integrated magnetic sensors for ultra-low field detection.
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Claire Baraduc, Samuel Manceau, Thomas Brun, Clarisse Ducruet, Philippe Sabon, Claude Cavoit, Guillaume Jannet, Ioan-Lucian Prejbeanu, and Matthieu Kretzschmar "Amplifying magnetic sensor sensitivity with ultra-high gain flux concentrator", Proc. SPIE PC12656, Spintronics XVI, PC126560Z (5 October 2023); https://doi.org/10.1117/12.2677610
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KEYWORDS
Magnetic sensors
Magnetic tunnel junctions
Solar concentrators
Analytic models
Magnetism
Sensors
Annealing
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