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(a) Optical image of the monolayer graphene layer after exfoliation onto a Si/SiO 2 substrate. (b) AFM image captured at the edge of the graphene flake in the region shown by the black square in (a). (c) Topographic linescan along the indicated white dashed line in (b). (d) Raman spectrum of the monolayer graphene flake captured through the hBN encapsulation layer. (e) Optical image captured through the polymer stamp after hot pickup of graphene with the hBN flake. The white dashed line indicates the footprint of the underlying graphene flake. (f) Optical image of the Hall sensor device after the graphene/hBN bilayer has been dropped onto the pre-patterned Au contacts with the delaminated PPC layer on top and (g) after removal of the PPC in chloroform. (h) Completed device after ICP etching of trenches to define the Hall cross geometry sensor.
Source publication
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 Ha...
Citations
Considering the growing interest in magnetic materials for unconventional computing, data storage, and sensor applications, there is active research not only on material synthesis but also characterisation of their properties. In addition to structural and integral magnetic characterisations, imaging of magnetisation patterns, current distributions and magnetic fields at nano- and microscale is of major importance to understand the material responses and qualify them for specific applications. In this roadmap, we aim to cover a broad portfolio of techniques to perform nano- and microscale magnetic imaging using superconducting quantum interference devices, spin centre and Hall effect magnetometries, scanning probe microscopies, x-ray- and electron-based methods as well as magnetooptics and nanoscale magnetic resonance imaging. The roadmap is aimed as a single access point of information for experts in the field as well as the young generation of students outlining prospects of the development of magnetic imaging technologies for the upcoming decade with a focus on physics, materials science, and chemistry of planar, three-dimensional and geometrically curved objects of different material classes including two-dimensional materials, complex oxides, semi-metals, multiferroics, skyrmions, antiferromagnets, frustrated magnets, magnetic molecules/nanoparticles, ionic conductors, superconductors, spintronic and spinorbitronic materials.
