  Efficient control of a magnetization without an application of the external
magnetic fields is the ultimate goal of spintronics. We demonstrate, that in
monolayers of $\text{CrI}_3$, magnetization can be switched all optically, by
application of the resonant pulses of circularly polarized light. This happens
because of the efficient coupling of the lattice magnetization with bright
excitonic transition. $\text{CrI}_3$ is thus perspective functional material
with high potential for applications in the domains of spintronics and
ultra-fast magnetic memory.
