论文标题
铁电180度壁比它们分开的域更柔软
Ferroelectric 180 degree walls are mechanically softer than the domains they separate
论文作者
论文摘要
域壁在功能上与它们分开的域不同，但是对它们的机械性能知之甚少。使用扫描探针显微镜，我们测量了铁电180O结构域壁的机械响应，并观察到，尽管分离了机械上相同的域（非有限弹性），但与域相比，这些壁在机械上差异很明显。在不同的铁电材料（Linbo3，batio3，pbtio3）中观察到了这种效果，并且具有不同的形态（从单晶到薄膜），因此它似乎是通用的。我们提出了一个理论框架，该框架解释了域壁的软化，并证明了所有铁电的效果应该是共同的。
Domain walls are functionally different from the domains they separate, but little is known about their mechanical properties. Using scanning probe microscopy, we have measured the mechanical response of ferroelectric 180o domain walls and observed that, despite separating domains that are mechanically identical (non-ferroelastic), the walls are mechanically distinct -- softer -- compared to the domains. This effect has been observed in different ferroelectric materials (LiNbO3, BaTiO3, PbTiO3) and with different morphologies (from single crystals to thin films) so it appears to be universal. We propose a theoretical framework that explains the domain wall softening and justifies that the effect should be common to all ferroelectrics.
