It has been more than 10 years since graphene was encapsulated in between of two hBN layers, becoming an excpetional platform to study of charge transport phenomena in the ballistic regime, including the Josephson effect. Encaspulation can also be realized by replacing the hBN layers with other van der Waals materials, enabling the study of proximity effects in ballistic devices. In particular, van der Waals magnetic insulators could be exploited to introduce time-reversal symmetry breaking in graphene-based Josephson junction.

In this work, I describe the fabrication and characterization of encapsulated graphene-based Josephson Junctions in which the graphene weak-link is encapsulated and proximitised by a van der Waals magnetic insulator. The devices are fabricated with the use of the deterministic transfer method and state-of-the-art litography techniques, and characterized with cryogenic DC transport measurements, aiming at verifying how the magnetic exchange field affect the charge transport characteristics.