Coexistence of Weak Ferromagnetism and Ferroelectricity in the High Pressure LiNbO3-Type Phase of FeTiO3

T. Varga, A. Kumar, E. Vlahos, S. Denev, M. Park, S. Hong, T. Sanehira, Y. Wang, C. J. Fennie, S. K. Streiffer, X. Ke, P. Schiffer, V. Gopalan, and J. F. Mitchell
Phys. Rev. Lett. 103, 047601 – Published 24 July 2009
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Abstract

We report the magnetic and electrical characteristics of polycrystalline FeTiO3 synthesized at high pressure that is isostructural with acentric LiNbO3 (LBO). Piezoresponse force microscopy, optical second harmonic generation, and magnetometry demonstrate ferroelectricity at and below room temperature and weak ferromagnetism below 120K. These results validate symmetry-based criteria and first-principles calculations of the coexistence of ferroelectricity and weak ferromagnetism in a series of transition metal titanates crystallizing in the LBO structure.

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  • Received 10 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.047601

©2009 American Physical Society

Authors & Affiliations

T. Varga1,*, A. Kumar2, E. Vlahos2, S. Denev2, M. Park3, S. Hong1, T. Sanehira4, Y. Wang4, C. J. Fennie5, S. K. Streiffer6, X. Ke7, P. Schiffer7, V. Gopalan2, and J. F. Mitchell1

  • 1Materials Science Division, Argonne National Laboratory, Argonne Illinois 60439, USA
  • 2Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 3Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejon 305-701, Korea
  • 4Center for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, USA
  • 5Department of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA
  • 6Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 7Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA

  • *Present address: Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA .

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Vol. 103, Iss. 4 — 24 July 2009

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