Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature

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 de...

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Autores principales:	Marilia Silva, Fernando Franco, Diana C. Leitao, Susana Cardoso, Paulo P. Freitas
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4f0a6957837b41d899a19ed5e7276e1d
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spelling	oai:doaj.org-article:4f0a6957837b41d899a19ed5e7276e1d2021-12-02T15:13:07ZTwo-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature10.1038/s41598-020-79856-02045-2322https://doaj.org/article/4f0a6957837b41d899a19ed5e7276e1d2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79856-0https://doaj.org/toc/2045-2322Abstract 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/ $$\sqrt{Hz}$$ Hz 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.Marilia SilvaFernando FrancoDiana C. LeitaoSusana CardosoPaulo P. FreitasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marilia Silva Fernando Franco Diana C. Leitao Susana Cardoso Paulo P. Freitas Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature
description	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/ $$\sqrt{Hz}$$ Hz 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.
format	article
author	Marilia Silva Fernando Franco Diana C. Leitao Susana Cardoso Paulo P. Freitas
author_facet	Marilia Silva Fernando Franco Diana C. Leitao Susana Cardoso Paulo P. Freitas
author_sort	Marilia Silva
title	Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature
title_short	Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature
title_full	Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature
title_fullStr	Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature
title_full_unstemmed	Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature
title_sort	two-dimensional arrays of vertically packed spin-valves with picotesla sensitivity at room temperature
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4f0a6957837b41d899a19ed5e7276e1d
work_keys_str_mv	AT mariliasilva twodimensionalarraysofverticallypackedspinvalveswithpicoteslasensitivityatroomtemperature AT fernandofranco twodimensionalarraysofverticallypackedspinvalveswithpicoteslasensitivityatroomtemperature AT dianacleitao twodimensionalarraysofverticallypackedspinvalveswithpicoteslasensitivityatroomtemperature AT susanacardoso twodimensionalarraysofverticallypackedspinvalveswithpicoteslasensitivityatroomtemperature AT paulopfreitas twodimensionalarraysofverticallypackedspinvalveswithpicoteslasensitivityatroomtemperature
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Two-dimensional arrays of vertically packed spin-valves with picoTesla sensitivity at room temperature

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