Magnetic response of magnetic ion-doped nanocrystals: Effects of single Mn(2+) impurity

Abstract

We theoretically study the effects of single spin-5/2 magnetic impurity (Mn(2+)) on the magnetic response of nanocrystals containing interacting electrons. The energy spectrum and magnetic susceptibility of II-VI spherical nanocrystals as a function of the electron number (N(e)=1-8) and the location of Mn(2+) ion are calculated by using the configuration interaction method. It is found that the sp-d coupling between the carriers and Mn(2+) ion significantly affects the low-field paramagnetism, depending on electron number and the location of the ion. The competition between electron-electron interaction and the sp-d coupling leads to the pronounced anisotropy of magnetic properties, ground state transitions in magnetic field, and the violation of Hund's second rule.