Electric field effect in diluted magnetic insulator anatase Co: TiO2.
An external electric field induced reversible modulation of a room temperature magnetic moment and coercive field is achieved in an epitaxial and insulating thin film of dilutely cobalt-doped anatase TiO2. This first demonstration of an electric field effect in any oxide-based diluted ferromagnet is realized in a high quality epitaxial heterostructure of PbZr(0.2)Ti(0.8)O(3)/Co: TiO(2)/SrRuO(3) 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.
Zhao
T
T
Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA. tongzhao@berkeley.edu
Shinde
S R
SR
Ogale
S B
SB
Zheng
H
H
Venkatesan
T
T
Ramesh
R
R
Das Sarma
S
S