As graphene is a two-dimensional (2D) material, consisting of just an atom-thick monolayer of carbon, it is not susceptible to the in-plane field component and it displays a very low thermal noise floor. Hence using it in magnetic field measurement enables significantly more accurate results to be derived. It is also worth noting that the thermal stability of graphene mitigates thermal drift. Although certain organisations have demonstrated graphene-based Hall-Effect sensors, they are still a long way off offering support of a fully scalable production process.
It must be acknowledged that the current most common methods for fabricating graphene are not very well aligned with high-volume commercial-grade electronics production requirements. There are basically two main options. The first method is exfoliating graphite. This can deliver good quality graphene, but it is typically over a very small area, cannot be customised to fit with specific end use requirements and can be multi-layered and non-homogeneous. These attributes seriously limit its effectiveness in a microelectronics context.
The other method is to synthesise graphene on some form of metal