The self-spin valve, an important giant-magnetoresistance effect observed down to a monolayer thickness, is highly desirable because of the ease of experimental sample preparation. Here, we target the A-type antiferromagnetic ${\mathrm{Ti}}_2\mathrm{C}$ monolayer MXene. Our first-principles calculations based on the density functional theory demonstrate that biaxial strain in the $xy$ plane is an effective approach to achieve the transition from an antiferromagnetic semiconductor to a room-temperature ferromagnetic metal in the A-type antiferromagnetic ${\mathrm{Ti}}_2\mathrm{C}$ monolayer MXene. The out-of-plane easy magnetization axis is robust under the strain. Interestingly, a nonzero magneto-optical Kerr effect signal emerges with a peak Kerr angle of 0.06 rad under a 7% tensile strain. Our results indicate that strain can effectively modulate the optospintronic valve.

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• Antiferromagnetism
• Magnetic anisotropy
• Magneto-optical effect
• Spintronics
• 2-dimensional systems
• Antiferromagnets
• Spin valves
• First-principles calculations