Magnetic and electronic properties of silicane with hydrogen vacancies on the surface

► Controllable magnetism can be obtained by creating H vacancies on the silicane surface. ► The spins of unsaturated Si in the single-sided domain are ferromagnetically ordered. ► In contrast, the double-sided domain is anti-ferromagnetic. ► The creation of H vacancies induces additional flat bands in the original band structure. ► The band gap can be manipulated by changing the size and/or shape of a certain domain.