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 a bright excitonic transition. ${\text{CrI}}_3$ is thus a perspective functional material with high potential for applications in the domains of spintronics and ultrafast magnetic memory.

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• Excitons
• Light-matter interaction
• Magnetism
• Magnetization switching
• Spintronics
• Dichalcogenides
• Monolayer films
• Optical techniques