Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging

Abstract A major challenge to routine non-invasive, nanoscale magnetic imaging is the development of Hall sensors that are stable under ambient conditions and retain low minimum detectable fields down to nanoscale dimensions. To address these issues we have fabricated and characterised chemical vapo...

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Autores principales:	David Collomb, Penglei Li, Simon J. Bending
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f25a27236db24d9bae7d93b6fc175a99
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spelling	oai:doaj.org-article:f25a27236db24d9bae7d93b6fc175a992021-12-02T15:08:21ZNanoscale graphene Hall sensors for high-resolution ambient magnetic imaging10.1038/s41598-019-50823-82045-2322https://doaj.org/article/f25a27236db24d9bae7d93b6fc175a992019-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-50823-8https://doaj.org/toc/2045-2322Abstract A major challenge to routine non-invasive, nanoscale magnetic imaging is the development of Hall sensors that are stable under ambient conditions and retain low minimum detectable fields down to nanoscale dimensions. To address these issues we have fabricated and characterised chemical vapour deposition (CVD) graphene Hall sensors with wire widths between 50 nm and 1500 nm, in order to exploit the high carrier mobility and tuneability of this material. The measured Hall voltage noise is in good agreement with theoretical models and we demonstrate that minimum detectable fields at fixed drive current are lowest in the vicinity of the charge neutrality point. Our best performing deep sub-micron sensors, based on a wire width of 85 nm, display the excellent room temperature resolution of 59 µT/√Hz at a dc drive current of 12 µA and measurement frequency of 531 Hz. We observe a weak increase in minimum detectable field as the active sensor area is reduced while the Hall offset field is largely independent of size. These figures-of-merit significantly surpass prior results on larger probes in competing materials systems, with considerable scope for further optimisation. Our results clearly demonstrate the feasibility of using CVD graphene to realise very high spatial resolution nanosensors for quantitative room temperature magnetic imaging.David CollombPenglei LiSimon J. BendingNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-10 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q David Collomb Penglei Li Simon J. Bending Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging
description	Abstract A major challenge to routine non-invasive, nanoscale magnetic imaging is the development of Hall sensors that are stable under ambient conditions and retain low minimum detectable fields down to nanoscale dimensions. To address these issues we have fabricated and characterised chemical vapour deposition (CVD) graphene Hall sensors with wire widths between 50 nm and 1500 nm, in order to exploit the high carrier mobility and tuneability of this material. The measured Hall voltage noise is in good agreement with theoretical models and we demonstrate that minimum detectable fields at fixed drive current are lowest in the vicinity of the charge neutrality point. Our best performing deep sub-micron sensors, based on a wire width of 85 nm, display the excellent room temperature resolution of 59 µT/√Hz at a dc drive current of 12 µA and measurement frequency of 531 Hz. We observe a weak increase in minimum detectable field as the active sensor area is reduced while the Hall offset field is largely independent of size. These figures-of-merit significantly surpass prior results on larger probes in competing materials systems, with considerable scope for further optimisation. Our results clearly demonstrate the feasibility of using CVD graphene to realise very high spatial resolution nanosensors for quantitative room temperature magnetic imaging.
format	article
author	David Collomb Penglei Li Simon J. Bending
author_facet	David Collomb Penglei Li Simon J. Bending
author_sort	David Collomb
title	Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging
title_short	Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging
title_full	Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging
title_fullStr	Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging
title_full_unstemmed	Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging
title_sort	nanoscale graphene hall sensors for high-resolution ambient magnetic imaging
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/f25a27236db24d9bae7d93b6fc175a99
work_keys_str_mv	AT davidcollomb nanoscalegraphenehallsensorsforhighresolutionambientmagneticimaging AT pengleili nanoscalegraphenehallsensorsforhighresolutionambientmagneticimaging AT simonjbending nanoscalegraphenehallsensorsforhighresolutionambientmagneticimaging
_version_	1718388227070492672

Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging

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