  As Moore's law is gradually losing its effectiveness, developing alternative
high-speed and low-energy-consuming information technology with post-silicon
advanced materials is urgently needed. The successful application of tunneling
magnetoresistance (TMR) in magnetic tunnel junctions (MTJs) has given rise to a
tremendous economic impact on magnetic informatics, including MRAM,
radio-frequency sensors, microwave generators and neuromorphic computing
networks. The emergence of two-dimensional (2D) materials brings opportunities
for MTJs based on 2D materials which have many attractive characters and
advantages. Especially, the recently discovered intrinsic 2D ferromagnetic
materials with high spin-polarization hold the promise for next-generation
nanoscale MTJs. With the development of advanced 2D materials, many efforts on
MTJs with 2D materials have been made both theoretically and experimentally.
Various 2D materials, such as semi-metallic graphene, insulating h-BN,
semiconducting MoS2, magnetic semiconducting CrI3, magnetic metallic Fe3GeTe2
and some other recently emerged 2D materials are discussed as the electrodes
and/or central scattering materials of MTJs in this review. We discuss the
fundamental and main issues facing MTJs, and review the current progress made
with 2D MTJs, briefly comment on work with some specific 2D materials, and
highlight how they address the current challenges in MTJs, and finally offer an
outlook and perspective of 2D MTJs.
