High resolution magnetic microscopy based on semi-encapsulated graphene Hall sensors
| Autor: | Penglei Li, David Collomb, Zhen Jieh Lim, Sara Dale, Philippa Shepley, Gavin Burnell, Simon J. Bending |
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| Rok vydání: | 2022 |
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| Zdroj: | Li, P, Collomb, D, Lim, Z J, Dale, S, Shepley, P, Burnell, G & Bending, S J 2022, ' High resolution magnetic microscopy based on semi-encapsulated graphene Hall sensors ', Applied Physics Letters, vol. 121, no. 4, 043502 . https://doi.org/10.1063/5.0097936 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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