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Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate

Taichi Goto1,*, Dong Hun Kim2, Xueyin Sun3, Mehmet C. Onbasli4, Juan M. Florez5, Shyue Ping Ong6, Patricio Vargas5, Karl Ackland7, Plamen Stamenov7 et al.

Nicolas M. Aimon4, Mitsuteru Inoue1, Harry L. Tuller4, Gerald F. Dionne4, J. Michael D. Coey7, and Caroline A. Ross4,†

  • 1Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibari-Ga-Oka, Tempaku, Toyohashi 441-8580, Japan
  • 2Department of Materials Science and Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Kyeonggi-do 449-728, Korea
  • 3School of Materials Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin 150001, China
  • 4Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
  • 5Departamento de Física, Universidad Técnica Federico Santa María, España 1680, Valparaíso, P.O. Box 110-V, Chile
  • 6Department of NanoEngineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, USA
  • 7School of Physics, Trinity College Dublin, College Green, Dublin 2, Ireland

  • *goto@ee.tut.ac.jp
  • †caross@mit.edu
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Phys. Rev. Applied 7, 024006 – Published 8 February, 2017

DOI: https://doi.org/10.1103/PhysRevApplied.7.024006

Abstract

Both polycrystalline and single-crystal films of iron-substituted strontium titanate, Sr(Ti0.65Fe0.35)O3−δ, prepared by pulsed laser deposition, show room-temperature magnetism and Faraday rotation, with the polycrystalline films exhibiting higher saturation magnetization and Faraday rotation. The magnetic properties vary with the oxygen pressure at which the films are grown, showing a maximum at pressures of approximately 4  μ Torr at which the unit-cell volume is largest. The results are discussed in terms of the oxygen stoichiometry and corresponding Fe valence states, the structure and strain state, and the presence of small-volume fractions of metallic Fe in single-crystal films grown at the optimum deposition pressure. Integration of magneto-optical polycrystalline films on an optical-waveguide device demonstrates a nonreciprocal phase shift.

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Phys. Rev. Applied 7, 024006– Published 8 February, 2017
  • Received 18 May 2016
Article part of CHORUS

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