Electric Field Effect in Diluted Magnetic Insulator Anatase $\mathrm{Co}\mathrm{\text{:}}\text{ }\text{ }{\mathrm{TiO}}_{2}$

Electric Field Effect in Diluted Magnetic Insulator Anatase $Co : {TiO}_{2}$

T. Zhao, S. R. Shinde, S. B. Ogale, H. Zheng, T. Venkatesan, R. Ramesh, and S. Das Sarma

Phys. Rev. Lett. 94, 126601 – Published 1 April 2005

Abstract

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 $Ti O_{2}$ . This first demonstration of an electric field effect in any oxide-based diluted ferromagnet is realized in a high quality epitaxial heterostructure of $PbZ r_{0.2} T i_{0.8} O_{3} / Co : Ti O_{2} / SrRu O_{3}$ grown on (001) $LaAl O_{3}$ . 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.

Received 6 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.126601

Authors & Affiliations

T. Zhao^1,*,†, S. R. Shinde², S. B. Ogale^1,2,‡, H. Zheng¹, T. Venkatesan², R. Ramesh^3,§, and S. Das Sarma⁴

¹Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
²Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, USA
³Department of Physics and Department of Materials Science and Engineering, University of California, Berkeley, CA 94720, USA
⁴Condensed Matter Theory Center, Department of Physics, University of Maryland, College Park, MD 20742, USA

^*Email address: tongzhao@berkeley.edu
^†Now at University of CA, Berkeley.
^‡Email address: ogale@squid.umd.edu
^§On leave from University of MD, College Park.

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Vol. 94, Iss. 12 — 1 April 2005

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Physical Review Letters

Electric Field Effect in Diluted Magnetic Insulator Anatase Co: TiO2

T. Zhao, S. R. Shinde, S. B. Ogale, H. Zheng, T. Venkatesan, R. Ramesh, and S. Das Sarma

Phys. Rev. Lett. 94, 126601 – Published 1 April 2005

Abstract

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Electric Field Effect in Diluted Magnetic Insulator Anatase $Co : {TiO}_{2}$