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Kinetics of the multiferroic switching in MnWO_4

机译:MnWO_4中多铁性转换的动力学

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摘要

The time dependence of switching multiferroic domains in MnWO_4 has been studied by time-resolved polarized neutron diffraction. Inverting an external electric field inverts the chiral magnetic component within rise times ranging between a few and some tens of milliseconds in perfect agreement with macroscopic techniques. There is no evidence for any faster process in the inversion of the chiral magnetic structure. The time dependence is well described by a temperature-dependent rise time suggesting a well-defined process of domain reversion. As expected, the rise times decrease when heating towards the upper boundary of the ferroelectric phase. However, switching also becomes faster upon cooling towards the lower boundary, which is associated with a first-order phase transition.
机译:通过时间分辨极化中子衍射研究了MnWO_4中切换多铁性畴的时间依赖性。与宏观技术完全吻合,将外部电场反转可以使手性磁性成分在几毫秒到几十毫秒之间的上升时间内反转。没有证据表明手性磁性结构的反转有任何更快的过程。时间依赖性由温度依赖性上升时间很好地描述,表明域还原的定义明确。如预期的那样,当朝铁电相的上边界加热时,上升时间减少。但是,在冷却到下边界时,切换也变得更快,这与一阶相变有关。

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  • 来源
    《Physical review》 |2014年第14期|144406.1-144406.10|共10页
  • 作者单位

    II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, 50937 Koeln, Germany;

    Institut fuer Physikalische Chemie, Georg-August-Universitaet Goettingen, Tammannstrasse 6, 37077 Goettingen, Germany;

    II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, 50937 Koeln, Germany;

    Juelich Centre for Neutron Science JCNS, Forschungszentrum Juelich GmbH, Outstation at ILL, 38042 Grenoble, France;

    Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France,ESS AB, Lund, Sweden;

    Institut Nanosciences et Cryogenie, CEA-Grenoble, 38054 Grenoble Cedex 9, France;

    Institut fuer Kristallographie, Universitat zu Koln, Greinstrasse 6, 50939 Koln, Germany;

    Institut fuer Kristallographie, Universitat zu Koln, Greinstrasse 6, 50939 Koln, Germany;

    Institut fuer Physikalische Chemie, Georg-August-Universitaet Goettingen, Tammannstrasse 6, 37077 Goettingen, Germany;

    II. Physikalisches Institut, Universitaet zu Koeln, Zuelpicher Strasse 77, 50937 Koeln, Germany;

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  • 正文语种 eng
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  • 关键词

    domain walls and domain structure;

    机译:畴壁和畴结构;

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