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Nanoscale Observation of Time-Dependent Domain Wall Pinning as the Origin of Polarization Fatigue

机译：时域畴壁钉扎的极化观察作为极化疲劳的起源

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The microscopic mechanism of polarization fatigue (i.e., a loss of switch-able polarization under electrical cycling) remains one of the most important long-standing problems in ferroelectric communities. Although there are numerous proposed fatigue models, a consensus between the models and experimental results is not reached yet. By using modified-piezoresponse force microscopy, nanoscale domain switching dynamics are visualized for different fatigue stages in epitaxial PbZr_(0.4)Ti_(0.6)O_3 capacitors. Systematic time-dependent studies of the domain nucleation and evolution reveal that domain wall pinning, rather than nucleation inhibition, is the primary origin of fatigue. In particular, the evolution of domain wall pinning process during electrical cycling, from the suppression of sideways domain growth in early fatigued stages to the blockage of forward domain growth in later stages, is directly observed. The pinning of forward growth results in a nucleation-lim-ited polarization switching and a significant slowdown of the switching time in the severely fatigued samples. The direct nanoscale observation of domain nucleation and growth dynamics elucidates the importance of evolution of the domain wall pinning process in the fatigue of ferroelectric materials.
机译：极化疲劳的微观机制（即在电循环下失去可切换极化）仍然是铁电社区中最重要的长期存在的问题之一。尽管提出了许多疲劳模型，但模型与实验结果之间尚未达成共识。通过使用改进的压电响应力显微镜，可以观察到外延PbZr_（0.4）Ti_（0.6）O_3电容器在不同疲劳阶段的纳米级域切换动力学。对晶核形成和演化的系统时间依赖性研究表明，晶畴壁钉扎而不是成核抑制是疲劳的主要来源。特别是，直接观察到了电循环过程中畴壁钉扎过程的演变，从抑制早期疲劳阶段的横向畴生长到阻止后期的正向畴生长。在严重疲劳的样品中，向前生长的束缚导致成核限制的极化转换，并且转换时间显着减慢。对畴成核和生长动力学的直接纳米级观察阐明了畴壁钉扎过程的演变在铁电材料疲劳中的重要性。

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  • 来源
    《Advanced Functional Materials》 |2012年第11期|p.2310-2317|共8页
  • 作者

    Sang Mo Yang; Tae Heon Kim; Jong-Gul Yoon; Tae Won Noh;

  • 作者单位

    Research Center for Functional Interfaces Department of Physics and Astronomy Seoul National University Seoul 151-747, Korea;

    Research Center for Functional Interfaces Department of Physics and Astronomy Seoul National University Seoul 151-747, Korea;

    Department of Physics University of Suwon Hwaseong, Gyunggi-do 445-743, Korea;

    Research Center for Functional Interfaces Department of Physics and Astronomy Seoul National University Seoul 151-747, Korea;

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