Size Effects on the Magnetism of Multiferroic BiFeO<sub>3</sub> Nanoparticles

ORAL

Abstract

We present a theory of the mechanisms that are responsible for the observation of enhanced ferromagnetism and the destruction of the cycloid in nanoparticles of the room temperature magnetoelectric multiferroic bismuth ferrite (BiFeO3). We consider the role of uncompensated spins at the surface, the impact of surface-induced magnetic anisotropy, and the RKKY interaction mediated by the surface charge density in the ferroelectric nanoparticles. The competing interactions give rise to rich magnetic phase diagrams as a function of size and chemical doping, opening up many opportunities for engineering the magnetic state of bismuth ferrite.

*We acknowledge support from NSERC (Canada), RGPIN/03938-2015.

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Presenters

  • Rogério de Sousa

    • Department of Physics and Astronomy, University of Victoria
    • Physics and Astronomy, Univ of Victoria

Authors

  • Rogério de Sousa

    • Department of Physics and Astronomy, University of Victoria
    • Physics and Astronomy, Univ of Victoria

  • Marc Allen

    • Department of Physics and Astronomy, University of Victoria

  • Ian Aupiais

    • Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot

  • Maximilien Cazayous

    • Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot