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- W3121122078 abstract "Abstract A new device architecture using giant magnetoresistive sensors demonstrates the capability to detect very low magnetic fields on the pT range. A combination of vertically packed spin-valve sensors with two-dimensional in-plane arrays, connected in series and in parallel, delivers a final detection level of 360 pT/ $$sqrt{Hz}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msqrt> <mml:mrow> <mml:mi>Hz</mml:mi> </mml:mrow> </mml:msqrt> </mml:math> at 10 Hz at room temperature. The device design is supported by an analytical model developed for a vertically packed spin-valve system, which takes into account all magnetic couplings present. Optimization concerning the spacer thickness and sensor physical dimensions depending on the number of pilled up spin-valves is necessary. To push the limits of detection, arrays of a large number of sensing elements (up to 440,000) are patterned with a geometry that improves sensitivity and in a configuration that reduces the resistance, leading to a lower noise level. The final device performance with pT detectivity is demonstrated in an un-shielded environment suitable for detection of bio-signals." @default.
- W3121122078 created "2021-01-18" @default.
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- W3121122078 date "2021-01-08" @default.
- W3121122078 modified "2023-10-18" @default.
- W3121122078 title "Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature" @default.
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- W3121122078 doi "https://doi.org/10.1038/s41598-020-79856-0" @default.
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