Projects per year
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.
Original language | English |
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Article number | 14424 (2019) |
Pages (from-to) | 14424 |
Number of pages | 10 |
Journal | Scientific Reports |
Volume | 9 |
Issue number | 1 |
DOIs | |
Publication status | Published - 8 Oct 2019 |
Keywords
- Graphene
- Magnetism
- Sensor
Fingerprint
Dive into the research topics of 'Nanoscale graphene Hall sensors for high-resolution ambient magnetic imaging'. Together they form a unique fingerprint.Projects
- 1 Finished
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Graphene Nanosensors for Scanning Hall Microscopy and Susceptometry
Bending, S. (PI), Wolverson, D. (CoI), Yuan, W. (CoI) & Li, P. (Researcher)
Engineering and Physical Sciences Research Council
1/01/18 → 30/06/21
Project: Research council
Profiles
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Simon Bending
- Department of Physics - Professor
- Centre for Sustainable Chemical Technologies (CSCT)
- Centre for Nanoscience and Nanotechnology
- Condensed Matter Physics CDT
- Centre for Integrated Materials, Processes & Structures (IMPS)
- NanoBioEletronics
- Institute of Sustainability and Climate Change
- Condensed Matter and Quantum Materials
Person: Research & Teaching, Core staff, Affiliate staff
Datasets
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Dataset for: "Nanoscale graphene Hall sensors for high-resolution magnetic imaging"
Collomb, D. (Creator), Li, P. (Creator) & Bending, S. (Creator), University of Bath, 8 Oct 2019
DOI: 10.15125/BATH-00587
Dataset
Equipment
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Raith Elphy Plus Electron Beam Lithography
Facility/equipment: Equipment