Roles of charge state and interatomic distance in the magnetic properties of C-doped MgO

- The magnetic moment in C-doped MgO system is due to the doping C impurity.
- C dopant plays a more effective role to form magnetism than Mg vacancy.
- The magnetic moment is determined by the charge states of the C dopant.
- The magnetic moment strongly depended on the distance between two C dopants.