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High resolution magnetic microscopy based on semi-encapsulated graphene Hall sensors
Penglei Li, David Collomb, Zhen Jieh Lim, Sara Dale, Philippa Shepley, Gavin Burnell, Simon J. Bending
OAI: oai:purehost.bath.ac.uk:publications/8460cb9b-83fa-4544-b68d-e6b379d344c1 • DOI: https://doi.org/10.1063/5.0097936
Abstract
The realization of quantitative, noninvasive sensors for ambient magnetic imaging with high spatial and magnetic field resolution remains a major challenge. To address this, we have developed a relatively simple process to fabricate semi-encapsulated graphene/hBN Hall sensors assembled by dry transfer onto pre-patterned gold contacts. 1 μm-sized Hall cross sensors at a drive current of 0.5 μA exhibit excellent room temperature sensitivity, SI ∼700 V/AT, and good minimum detectable fields, Bmin = 0.54 G/Hz0.5 at a measurement frequency of 1 kHz, with considerable scope for further optimization of these parameters. We illustrate their application in an imaging study of labyrinth magnetic domains in a ferrimagnetic yttrium iron garnet film.