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Compositional tuning of the strain-induced structural phase transition and of ferromagnetism in Bi1−xBaxFeO3−δ

Published online by Cambridge University Press:  13 May 2011

Charlee J.C. Bennett ,
Hyun Sik Kim ,
Maria Varela ,
Michael D. Biegalski ,
Dae Ho Kim ,
David P. Norton ,
Harry M. Meyer III  and
Hans M. Christen
Charlee J.C. Bennett
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Hyun Sik Kim
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; and Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
Maria Varela
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Michael D. Biegalski
Affiliation:
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Dae Ho Kim
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; and Department of Physics, Tulane University, New Orleans, Louisiana 70118
David P. Norton
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
Harry M. Meyer III
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
Hans M. Christen*
Affiliation:
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831; and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
*
a)Address all correspondence to this author. e-mail: christenhm@ornl.gov
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Abstract

Recent studies by a number of research groups have shown that the structure of epitaxial BiFeO3 (BFO) films changes drastically as a function of substrate-induced biaxial compression, with the crystal structure changing from one being nearly rhombohedral (R-like) to one being nearly tetragonal (T-like), where the “T-like” structure is characterized by a highly enhanced c/a ratio of out-of-plane c to in-plane a lattice parameters. In this work, we show that the critical compressive strain σc necessary to induce this transition can be reduced significantly by substituting 10% Ba for Bi [Bi0.9Ba0.1FeO3−δ (BBFO)] and that the “T-like” phase in both BBFO and BFO is stable up to the decomposition temperatures of the films in air. Furthermore, our results show that the BBFO solid solution shows clear ferromagnetic properties in contrast to its undoped BFO counterpart.

Keywords

FerroelectricFerromagneticEpitaxy
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 10 , 28 May 2011 , pp. 1326 - 1331
Copyright
Copyright © Materials Research Society 2011

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