[Pw_forum] About the coupling of atoms with the vacancy

[Pankaj Sahota]

Hello everybody,
Can anybody explain me what the nature of coupling of an atom’s moment with the nearby vacancy means? To decide the nature of interaction between two atoms, we need to have the presence of charge, but in case of vacancy, how can we say whether, the interaction is ferro or antiferromagnetic?

Thanks in advance
Pankaj