Two-dimensional intrinsic magnets with multiple magnetic atomic layers often allow the magnetic phase and the magnetic anisotropy transitions, providing a versatile platform for exploring monolayer spin valve and magneto-optical effects. Based on the first-principles calculations and Monte Carlo simulations, both spin valve and magneto-optical effects emerge from the strained ${\mathrm{Cr}}_2{\mathrm{Te}}_3$ monolayer. The ${\mathrm{Cr}}_2{\mathrm{Te}}_3$ monolayer is a ferromagnetic metal with an in-plane easy magnetization axis and a Curie temperature of 495 K. Under the tensile strain up to 4.2%, it transitions to an antiferromagnetic semiconductor. The direction of the easy magnetization axis changes to an out-of-plane direction during strains from 1% to 4%, and also induces a variance of the Kerr rotation angle through the magneto-optical Kerr effect. We provide a potential candidate material for the design of a future room-temperature monolayer spin valve and optospintronic devices.

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• Ferromagnetism
• Magnetic anisotropy
• Magneto-optical Kerr effect
• Spintronics
• 2-dimensional systems
• Ferromagnets
• Spin valves
• First-principles calculations