Engineering a multiferroic monodomain in BiFeO3 films through magnetoelastic control

ORAL

Abstract

The presence of domains in ferroic materials can diminish their macroscopic properties and hence their usefulness in device applications. This effect is particularly limiting in multiferroic materials such as BiFeO3, which combine magnetic, ferroelectric and ferroelastic orders, and tend to grow with numerous domain variants in all three sectors. Here, we present the use of strain and electric fields to control the magnetic domain population in (111)-BiFeO3 films. This orientation maximises the out-of-plane polarisation but generally results in a texture of magnetic domains. By exploiting the magnetoelastic coupling between the magnetic and crystal structures, and measuring the resulting magnetic domain populations by magnetic x-ray and neutron diffraction, we demonstrate the use of substrate strain to engineer a ferroelastic, ferroelectric, and magnetic monodomain, coherent over an entire 1-micron-thick BiFeO3 film. We further demonstrate the coupling of the magnetic structure to the ferroelectric polarisation by showing the cycloidal rotation direction (magnetic polarity) is inverted upon 180-degree switching of the polarisation.

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Presenters

  • Noah Waterfield Price

    Clarendon Laboratory, University of Oxford, Clarendon Laboratory, Department of Physics, University of Oxford, Physics, University of Oxford

Authors

  • Noah Waterfield Price

    Clarendon Laboratory, University of Oxford, Clarendon Laboratory, Department of Physics, University of Oxford, Physics, University of Oxford

  • Roger Johnson

    Clarendon Laboratory, University of Oxford, Clarendon Laboratory, Department of Physics, University of Oxford, Physics, University of Oxford

  • Wittawat Saenrang

    Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Jonathan Schad

    Matls Sci & Eng, University of Wisconsin-Madison, Department of Materials Science and Engineering, University of Wisconsin-Madison

  • Francis Chmiel

    Clarendon Laboratory, University of Oxford, Clarendon Laboratory, Department of Physics, University of Oxford, Physics, University of Oxford

  • Alessandro Bombardi

    Diamond Light Source, Harwell Science and Innovation Campus

  • Francesco Maccherozzi

    Diamond Light Source, Diamond Light Source, Harwell Science and Innovation Campus

  • Sarnjeet Dhesi

    Diamond Light Source, Diamond Light Source, Harwell Science and Innovation Campus

  • Chang-Beom Eom

    University of Wisconsin-Madison, Univ of Wisconsin-Madison, Univ of Wisconsin, Madison, Department of Material Science and Engineering, University of Wisconsin-Madison, Matls Sci & Eng, University of Wisconsin-Madison, University of Wisconsin, Department of Materials Science and Engineering, University of Wisconsin-Madison, University of Wisconsin–Madison, MS&E, University of Wisconsin, Physics, University of Wisconsin–Madison, Department of Materials Science and Engineering, University of Wisconsin - Madison

  • Paolo Radaelli

    Physics, University of Oxford, Clarendon Laboratory, University of Oxford