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Competing polarization reversal mechanisms in ferroelectric nanowires

机译：铁电纳米线中的竞争极化反转机理

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摘要

Polarization reversal in ferroelectrics has been a subject of intense interest for many years owing to both its scientific appeal and practical utility. In recent years the interest has increased even further thanks to the expectations of achieving ultrafast polarization reversal at the nanoscale. While most of the studies up to now are focused on the polarization reversal in ferroelectric thin films, we report the intrinsic dynamics of ultrafast polarization reversal in ferroelectric nanowires. Using atomistic first-principles-based simulations, we trace the time evolution of polarization under applied electric field to reveal the existence of two competing polarization reversal mechanisms: (i) domain-driven and (ii) homogeneous. The analysis of their microscopic origin allows us to postulate the associated laws and leads to a deeper understanding of polarization reversal dynamics in general. In addition, we find that in defect-free nanowires the polarization reversal can occur within picoseconds, which potentially is very promising for ultrafast memory and other applications.
机译：多年来，由于其科学吸引力和实用性，铁电中的极化反转已引起人们极大的兴趣。近年来，由于对实现纳米级超快极化反转的期望，人们的兴趣进一步增加。尽管到目前为止，大多数研究都集中在铁电薄膜中的极化反转，但我们报告了铁电纳米线中超快极化反转的内在动力学。使用基于原子原理的第一性原理的仿真，我们跟踪了施加电场下极化的时间演化，以揭示两种竞争的极化反转机制的存在：（i）域驱动和（ii）均质。对它们的微观起源的分析使我们能够推测出相关的定律，并导致对一般的极化反转动力学有更深入的了解。此外，我们发现，在无缺陷的纳米线中，极化反转可以在皮秒内发生，这对于超快存储和其他应用而言非常有希望。

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  • 来源
    《Physical review》 |2012年第21期|214108.1-214108.6|共6页
  • 作者

    Kevin McCash; A. Srikanth; I. Ponomareva;

  • 作者单位

    Department of Physics, University of South Florida, Tampa, Florida 33620, USA;

    Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, Illinois 61820, USA;

    Department of Physics, University of South Florida, Tampa, Florida 33620, USA;

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  • 正文语种 eng
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  • 关键词

    polarization and depolarization; switching phenomena;

    机译：极化和去极化;切换现象;

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