Multiferroic order in BiFeO<sub>3</sub> nanoparticles

ORAL

Abstract

Multiferroics exhibit simultaneous presence of magnetic and electric ordering. The archetypical multiferroic material, BiFeO3 (BFO), has attracted much attention since it has both, high ferroelectric Curie temperature (1103 K) and, high antiferromagnetic Néel temperature (643 K) in bulk and thin film form. Furthermore, it has one of the highest electrical polarization (~90μC/cm2) among ferroelectric materials. We propose a new route to a magnetic control via nano-structuration in the form of nanoparticles (NPs). We have grown BFO NPs by a sol-gel process and found that their magnetism can be tuned from antiferromagnetic to ferromagnetic by controlling the particle size. Piezoelectric force microscopy and VSM measurements show that our NPs are ferroelectric and ferromagnetic, and therefore our results open new ways to achieve magnetoelectric coupling in BFO nano-structures.

*Work supported by Fondo de Apoyo para Profesores Asistentes (FAPA) through the Facultad de Ciencias and Vicerrectoria de Investigaciones of Universidad de los Andes, Bogota Colombia and Colciencias No. 120471250659. Structural studies at UCSD supported by US-DOE-DEFG02-87ER45332

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Presenters

  • Juan Ramirez

    • Physics, Univ de Los Andes
    • Departamento de Física, Universidad de Los Andes
    • Univ de Los Andes

Authors

  • D. Carranza

    • Physics, Univ de Los Andes
    • Univ de Los Andes

  • A. Cardona

    • Physics, Univ de Los Andes
    • Univ de Los Andes

  • J. Narvaez

    • Physics, Univ de Los Andes
    • Univ de Los Andes

  • Ilya Valmianski

    • Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego
    • UC San Diego

  • Javier del Valle Granda

    • UC San Diego

  • Ivan Schuller

    • Department of Physics, Univ of California - San Diego
    • University of California, San Diego
    • Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego
    • UC San Diego
    • Department of Physics and Center for Advance Nanoscience, University of California San Diego
    • Physics Department and Center for Advanced Nanoscience, University of California San Diego
    • Univ of California - San Diego
    • Physics, University of California, San Diego

  • Andreas Reiber

    • Chemistry, Univ. de los Andes
    • Univ de Los Andes

  • Juan Ramirez

    • Physics, Univ de Los Andes
    • Departamento de Física, Universidad de Los Andes
    • Univ de Los Andes