Magnetic field detection limits for ultraclean graphene Hall sensors.

ABSTRACT: Solid-state magnetic field sensors are important for applications in commercial electronics and fundamental materials research. Most magnetic field sensors function in a limited range of temperature and magnetic field, but Hall sensors in principle operate over a broad range of these conditions. Here, we evaluate ultraclean graphene as a material platform for high-performance Hall sensors. We fabricate micrometer-scale devices from graphene encapsulated with hexagonal boron nitride and few-layer graphite. We optimize the magnetic field detection limit under different conditions. At 1 kHz for a 1 μm device, we estimate a detection limit of 700 nT Hz^-1/2 at room temperature, 80 nT Hz^-1/2 at 4.2 K, and 3 μT Hz^-1/2 in 3 T background field at 4.2 K. Our devices

SUBMITTER: Schaefer BT 

PROVIDER: S-EPMC7441171 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature