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Since the birth of the single-layer grapheme, it is highly desirable to explore functional ultrathin films with the thickness limited to one or several unit cells.Our first-principles investigation shows that a single-unit-cell CrO2 layer stabilized on rutile TiO2 (001) surface can transit from a semiconducting state to a metallic one when an appropriate electric field is applied, and therefore an interesting electric switching effect can be achieved in this system.On the other hand, it has been found experimentally that magnetic storage of information can be realized with antiferromagnetic Fe-spin chains on some Cu2N surfaces.Through our dynamical spin Monte Carlo simulations, we elucidate the finite-temperature magnetic dynamics and realize some spin manipulations of the Neel states in such spin systems.