Magnetism of BiFeO<sub>3 </sub>Nanoparticles across its ferroelectric phase transition

ORAL

Abstract

Multiferroics exhibit simultaneous magnetic and ferroelectric 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. Here we explore a new route of magnetic control via nano-structuration in the form of nanoparticles (NPs). We fabricated BFO NPs by the sol-gel method with different particle sizes. We have found that their magnetic properties at room temperature and down to 2K change drastically by varying the NP size. Here we present magnetometry studies at high temperature up to the ferroelectric phase transition crossing the antiferromagnetic ordering temperature. These measurements were contrasted with XRD at high temperature to map the structural phase transition associate to the ferroelectric distortion. Our results suggest that NP size also modifies the ferroelectric and antiferromagnetic transition, allowing for a full control of the multiferroic ordering.

*Partial Funding provided by Vicerrectoria de Investigaciones Universidad de los Andes and DOE grant DE-FG02-87ER-45332

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Presenters

  • Juan Ramirez

    • University of the Andes
    • Physics, Universidad de los Andes
    • Department of physics, University of the Andes

Authors

  • Alexander Cardona

    • University of the Andes
    • Department of physics, University of the Andes

  • Edwin RAMOS

    • University of the Andes
    • Department of physics, University of the Andes

  • Alex Hojem

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

  • Andreas Reiber

    • University of the Andes

  • Ivan Schuller

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

  • Juan Ramirez

    • University of the Andes
    • Physics, Universidad de los Andes
    • Department of physics, University of the Andes