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Long-range magnetic interactions in the multiferroic antiferromagnet MnWO_4

机译：多铁性反铁磁体MnWO_4中的远距离磁相互作用

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摘要

The spin-wave excitations of the multiferroic MnWO_4 have been measured in its low-temperature collinear commensurate phase using high-resolution inelastic neutron scattering. These excitations can be well described by a Heisenberg model with competing long-range exchange interactions and a single-ion anisotropy term. The magnetic interactions are strongly frustrated within the zigzag spin chain along the c axis and between chains along the a axis, while the coupling between spin along the b axis is much weaker. The balance of these interactions results in the noncollinear incommensurate spin structure associated with the magnetoelectric effect, and the perturbation of the magnetic interactions leads to the observed rich phase diagrams of the chemically doped materials. This delicate balance can also be tuned by the application of external electric or magnetic fields to achieve magnetoelectric control of this type of materials.
机译：已使用高分辨率非弹性中子散射在其低温共线相称相中测量了多铁性MnWO_4的自旋波激发。这些激发可以通过具有竞争性长距离交换相互作用和单离子各向异性项的Heisenberg模型很好地描述。在沿着C轴的锯齿形自旋链中以及沿着a轴的链之间，磁性相互作用受到强烈挫败，而沿着b轴的自旋之间的耦合则弱得多。这些相互作用的平衡导致与磁电效应相关的非共线不对称自旋结构，并且磁性相互作用的扰动导致观察到化学掺杂材料的富相图。这种微妙的平衡还可以通过施加外部电场或磁场来实现，以实现此类材料的磁电控制。

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  • 来源
    《Physical review》 |2011年第14期|p.140401.1-140401.4|共4页
  • 作者

    Feng Ye; Randy S. Fishman; Jaime A. Femandez-Baca; Andrey A. Podlesnyak; Georg Ehlers; Herbert A. Mook; Yaqi Wang; Bemd Lorenz; C. W. Chu;

  • 作者单位

    Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA,Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA;

    Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics and TCSUH, University of Houston, Houston, Texas 77204, USA;

    Department of Physics and TCSUH, University of Houston, Houston, Texas 77204, USA;

    Department of Physics and TCSUH, University of Houston, Houston, Texas 77204, USA;

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  • 正文语种 eng
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  • 关键词

    spin waves; antiferromagnetics; neutron inelastic scattering;

    机译：自旋波;反铁磁;中子非弹性散射;

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