High resolution magnetic microscopy based on semi-encapsulated graphene Hall sensors
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 transf...
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Veröffentlicht in: | Applied Physics Letters 2022-07, Vol.121 (4), Article 043502 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/5.0097936 |