High resolution magnetic microscopy based on semi-encapsulated graphene Hall sensors
High resolution magnetic microscopy based on semi-encapsulated graphene Hall sensors
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DOI：
10.1063/5.0097936
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发表时间：
2022-07
影响因子：
4
通讯作者：
Penglei Li;D. Collomb;Zhen Jieh Lim;Sara Dale;P. Shepley;G. Burnell;S. Bending
中科院分区：
文献类型：
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作者：
Penglei Li;D. Collomb;Zhen Jieh Lim;Sara Dale;P. Shepley;G. Burnell;S. Bending
实现具有高空间和磁场分辨率的环境磁成像定量、非侵入式传感器仍然是一个重大挑战。为了解决这个问题，我们开发了一种相对简单的工艺来制造半封装石墨烯/六方氮化硼霍尔传感器，通过干转移将其组装到预先图案化的金触点上。 1 μm 尺寸的霍尔交叉传感器在 0.5 μA 驱动电流下表现出出色的室温灵敏度（SI ∼ 700 V/AT），以及良好的最小可检测场（在 1 kHz 测量频率下 Bmin = 0.54 G/Hz0.5），这些参数的进一步优化具有相当大的空间。我们说明了它们在亚铁磁性钇铁石榴石薄膜中迷宫磁畴成像研究中的应用。
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.