Peculiarities of ferromagnetic ordering in dilute magnetic dielectrics
School of Physics and Astronomy Tel-Aviv University, Tel-Aviv 69978, Israel
Received August 7, 2008
The state of art in theoretical and experimental studies of transition metal doped oxides (dilute magnetic dielectrics) is reviewed. The available data show that the generic non-equilibrium state of oxide films doped with magnetic impurities may either favor ferromagnetism with a high Curie temperature or result in a highly inhomogeneous state without longrange
magnetic order. In all cases concomitant defects (vacancies, shallow donors and acceptors) play a crucial part.
PACS: 75.50.Dd Nonmetallic ferromagnetic materials; PACS: 75.30.Et Exchange and superexchange interactions; PACS: 71.55.–i Impurity and defect levels; PACS: 61.72.J– Point defects and defect clusters.
Key words: dilute magnetic dielectrics, thermodynamic non-equilibrium, multiphase state.