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Field-induced incommensurate-to-commensurate phase transition in the magnetoelectric

机译:磁场在磁电中引起的不相称到相称的相变

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摘要

Using neutron diffraction, we investigated the spin structures of magnetoelectric hexaferrite, Ba(0.5)Sr_(1.5) Zn_2(Fe_(1-x)Al_x)_12O_22 (x = 0.08) under a magnetic field {H ⊥ c). When the crystal was cooled in a zero field, longitudinal spin cones were observed at low temperatures. These incommensurate phases, however, were replaced by the commensurate phase [k_1 = (0,0,3/2)] when the ferroelectricity was induced by an external field perpendicular to the c axis. Magnetic structure refinement confirms that this commensurate order is compatible with the spin-current polarization. We argue that planar magnetic anisotropy plays an important role in determining the magnetic structure that is responsible for its magnetoelectricity.
机译:使用中子衍射,我们在磁场{H⊥c}下研究了磁电六方铁氧体Ba(0.5)Sr_(1.5)Zn_2(Fe_(1-x)Al_x)_12O_22(x = 0.08)的自旋结构。当晶体在零场中冷却时,在低温下观察到纵向自旋锥。但是,当垂直于c轴的外部电场感应出铁电时,这些不相称相将被相称相[k_1 =(0,0,3 / 2)]取代。磁结构的细化证实了这一相称的顺序与自旋电流极化兼容。我们认为,平面磁各向异性在确定负责其磁电的磁性结构中起着重要作用。

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  • 来源
    《Physical review》 |2011年第14期|p.144425.1-144425.6|共6页
  • 作者单位

    Department of Physics, Korea University, Seoul 136-713, South Korea;

    Department of Physics, Korea University, Seoul 136-713, South Korea;

    Department of Physics, Korea University, Seoul 136-713, South Korea;

    Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul 151-747, South Korea;

    Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul 151-747, South Korea;

    Department of Physics and Astronomy, CeNSCMR, Seoul National University, Seoul 151-747, South Korea;

    Helmholtz-Zentrum fuer Materialien und Energie, D-14109 Berlin, Germany;

    Helmholtz-Zentrum fuer Materialien und Energie, D-14109 Berlin, Germany;

    Helmholtz-Zentrum fuer Materialien und Energie, D-14109 Berlin, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    antiferromagnetics; ferrimagnetics;

    机译:反铁磁;亚铁磁;

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