Magnetic Defects in Semiconductors

There are a number of defects that could give rise to magnetic properties alone or interact with magnetic impurities to enhance magnetic behavior. In ZnO-based films such as Ziij vCuvO, ferromagnetism is believed to arise with Zn2 or Zn, interstitials. 

In films such as Sn02, oxygen vacancies together with liberated electrons are implicated in the ferromagnetic properties. 

The interaction between a charged point defect and neighboring magnetic ions in magnetically doped thin films has been described in terms of a defect cluster called a bound magnetic polaron (Fig. 9.5a). The radius of a bound magnetic polaron due to an electron located on the defect, r, is given by 

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