Electric Field Effect in Diluted Magnetic Insulator Anatase Co:TiO2
  An external electric field induced reversible modulation of room temperature magnetic moment is achieved in an epitaxial and insulating thin film of dilutely cobalt-doped anatase TiO2. This first demonstration of electric field effect in any oxide based diluted ferromagnet is realized in a high quality epitaxial heterostructure of PbZr0.2Ti0.8O3/Co:TiO2/SrRuO3 grown on (001) LaAlO3. The observed effect, which is about 15% in strength in a given heterostructure, can be modulated over several cycles. Possible mechanisms for electric field induced modulation of insulating ferromagnetism are discussed. 
T. Zhao, S. R. Shinde, S. B. Ogale, H. Zheng, T. Venkatesan, R.   Ramesh, S. Das Sarma