  Research in two-dimensional (2D) materials has experienced rapid growth in
the past few years. In particular, various layered compounds exhibiting quantum
phenomena, such as superconductivity and magnetism, have been isolated in
atomically thin form, often in spite of their chemical instability. The nature
of the 2D phases can be different than their bulk counterparts, making such
systems attractive for fundamental studies. Owing to their high crystallinity
and absence of dangling bonds, devices and heterostructures incorporating these
materials may also show performance exceeding that of traditional films. In
this roadmap article, we focus on a few recent developments in spin-based
quantum devices utilizing the 2D magnetic semiconductor, CrI$_3$.
