Interface-Induced Magnetic Coupling in Multiferroic/Ferromagnetic Bilayer: An Ultrafast Pump-Probe Study

ORAL

Abstract

By use of optical pump-probe measurement, we study the relaxation dynamics of a muliferroic-ferromagnetic TbMnO$_{3}$/La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ bilayer. The relaxation dynamics of both layers are well separated in time allowing us to investigate the magnetic coupling across the bilayer. We observe that the relaxation dynamics of the individual layers in the bilayer sample are the result of the interplay between the intrinsic magnetic order and the induced interfacial effect. Our data suggest the existence of induced ferromagnetic order in the TbMnO$_{3}$ layer, and antiferromagnetic order in the La$_{0.7}$Sr$_{0.3}$MnO$_{3}$ layer.

*Singapore NRF CRP (NRF-CRP4-2008-04) and MOE AcRF Tier 1 (RG 13/12)

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Authors

  • Ee Min Elbert Chia

    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University
    • Nanyang Tech Univ

  • Chan La-o-vorakiat

    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University

  • Y.F. Tian

    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University

  • Tom Wu

    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University

  • Christos Panagopoulos

    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University

  • Jian-Xin Zhu

    • Los Alamos National Laboratory
    • Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
    • Theoretical Division and Center for Integrated Technologies, Los Alamos National Laboratory
    • Center for Integrated Nanotechnologies, Los Alamos National Laboratory
    • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
    • Los Alamos National Lab
    • Theoretical Division and Center for Nonlinear Studies, LANL, Los Alamos, New Mexico 87545, USA
    • Los Alamos Natl Lab

  • Haibin Su

    • Division of Materials Technology, School of Materials Science and Engineering, Nanyang Technological University