Neutron Investigations of Multiferroic LuFe1-xMnxO3

ORAL

Abstract

While many new multiferroic materials have surfaced, only BiFeO$_{3}$ has been shown to evince coupling of both order parameters at room temperature. Materials in which the application of an electric field can directly switch the magnetization by 180 degrees have also been elusive. New theoretical predictions suggest that this will be possible in hexagonal LuFeO$_{3}$. Recent measurements of LuFeO$_{3}$ are promising. Bulk LuFeO$_{3}$ crystallizes in the Pbnm space group. However, it can be stabilized in the P6$_{3}$cm space group in thin films. Films are found to be ferroelectric at room temperature with a remanent polarization of 6.5 $\frac{\mu C}{cm^{2}}$along the c-axis and is of a respectable magnitude, evincing long range magnetic order with spins in the plane forming the familiar 120 degree structure. At lower temperatures, it was found that the moments begin to cant. Theoretical predictions suggest that this canted moment can be switched with an electric field. Unfortunately, this canting occurs at 130 K. While the recent work in films is exciting, it is important to understand what is intrinsic to the material. Recently, we have been able to stabilize ceramic samples of LuFeO$_{3}$ in the hexagonal form. During this talk we will discuss the magnetic structure of this compound in the bulk. We will also discuss our inelastic neutron scattering results.

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Authors

  • William Ratcliff

    NIST Center for Neutron Research, NIST, NIST

  • Steven Disseler

    National Institute of Standards and Technology, NIST Center for Neutron Research, NIST, NIST Center for Neutron Research

  • Alexander Zhang

    Montgomery Blair

  • Dylan Quintana

    Carnegie Mellon University

  • Yoon Seok Oh

    Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Department of Physics, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway 08854, NJ, USA, Dept. of Phys. \& Astro., Rutgers

  • Jeffrey Lynn

    NCNR, NIST, MD, NIST Center for Neutron Research, NIST, NIST Center for Neutron Research, NIST Center for Neutron Research, Gaithersburg, MD 20899

  • S.-W. Cheong

    Rutgers University, Department of Physics, Rutgers University, Rutgers University, NJ, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers U., NJ, USA, Rutgers, The State University of New Jersey, Department of Physics and Astronomy, Rutgers University, Rutgers Center for Emergent Materials and Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway 08854, NJ, USA