  Within the field of spintronics major efforts are directed towards developing
applications for spin-based transport devices made fully out of two-dimensional
(2D) materials. In this work we present an experimental realization of a
spin-valve device where the generation of the spin signal is exclusively
attributed to the spin-dependent conductivity of the magnetic graphene
resulting from the proximity of an interlayer antiferromagnet, CrSBr. We
clearly demonstrate that the usage of the conventional 3D magnetic contacts,
that are commonly air-sensitive and incompatible with practical technologies,
can be fully avoided when graphene/CrSBr heterostructures are employed.
Moreover, apart from providing exceptionally long spin relaxation length, the
usage of graphene for both generation and transport of the spin allows to
automatically avoid the conductivity mismatch between the source and the
channel circuits that has to be considered when using conventional
low-resistive contacts. Our results address a necessary step in the engineering
of spintronic circuitry out of layered materials and precede further
developments in the area of complex spin-logic devices. Moreover, we introduce
a fabrication procedure where we designed and implemented a recipe for the
preparation of electrodes via a damage-free technique that offers an immediate
advantage in the fields of air-sensitive and delicate organic materials.
