The electronic structures and magnetic properties of two dimensional (2D) hexagonal Ni(OH)(2) are explored based on first-principles calculations. The results reveal that the ground state of the pristine Ni(OH)(2) is a direct semiconductor with antiferromagnetic (AFM) coupling between two nearest Ni atoms. Interestingly, the monolayer Ni(OH)(2) becomes a ferromagnetic (FM) semiconductor under a biaxial compressive strain of 4%. Furthermore, the band gap of monolayer Ni(OH)(2) can be modulated by the different biaxial strains. These tunable electronic structures and magnetic properties of the Ni(OH)(2) monolayer make it a promising candidate for applications in 2D spin-devices.
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