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Evidence for room-temperature multiferroicity in a compound with a giant axial ratio

Abstract : In the search for multiferroic materials magnetic compounds with a strongly elongated unit-cell (large axial ratio c/a) have been scrutinized intensely. However, none was hitherto proven to have a switchable polarization, an essential feature of ferroelectrics. Here, we provide evidence for the epitaxial stabilization of a monoclinic phase of BiFeO3 with a giant axial ratio (c/a=1.23) that is both ferroelectric and magnetic at room temperature. Surprisingly, and in contrast with previous theoretical predictions, the polarization does not increase dramatically with c/a. We discuss our results in terms of the competition between polar and antiferrodistortive instabilities and give perspectives for engineering multiferroic phases. © 2009 The American Physical Society.
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https://hal-centralesupelec.archives-ouvertes.fr/hal-02269653
Contributor : Amandine Lustrement <>
Submitted on : Friday, August 23, 2019 - 10:34:20 AM
Last modification on : Wednesday, July 1, 2020 - 4:22:03 PM

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H. Béa, B. Dupé, S. Fusil, R. Mattana, E. Jacquet, et al.. Evidence for room-temperature multiferroicity in a compound with a giant axial ratio. Physical Review Letters, American Physical Society, 2009, 102 (21), pp.217603. ⟨10.1103/PhysRevLett.102.217603⟩. ⟨hal-02269653⟩

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