Publication Type:Journal Article
Source:Physical Review Letters, Volume 94, Number 12 (2005)
Keywords:Anomalous Hall effect (AHE), Cobalt, Coercive force, Diluted magnetic semiconductors (DMS), Electric field effects, Electric insulators, Ferromagnetic materials, Ferromagnetism, Hall effect, Heterojunctions, Lead compounds, Magnetic insulators, Magnetic moments, Magnetization, Manganites, Photolithography, Polarons, pulsed laser deposition, Strontium compounds, Titanium dioxide
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 TiO 2. This first demonstration of an electric field effect in any oxide-based diluted ferromagnet is realized in a high quality epitaxial heterostructure of PbZr 0.2Ti 0.8O 3/Co: TiO 2/SrRuO 3 grown on (001) LaAlO 3. 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. © 2005 The American Physical Society.
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