Domain wall kinetics of lithium niobate single crystals near the hexagonal corner
Domain wall kinetics of lithium niobate single crystals near the hexagonal corner
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六角形角附近铌酸锂单晶的畴壁动力学
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Ro
中科院分区：
文献类型：
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作者：
Ju Choi;D. Ko;N. Yu;K. Kitamura;J. Ro
提出了一种基于六方晶格平面中简单微观二维Ising模型的中间层方法来解释MgO掺杂的化学计量比Li_2O_3（0001）面中宏观的“非对称畴内-畴外壁运动”现象。在施加高于常规矫顽场（Ec）的电场到铁电晶体的情况下，获得具有平行于晶体的Y轴的壁的自然六边形畴。当在相反方向上施加约0.1Ec的矫顽场的一部分时，该六边形畴从拐角位置收缩（向内移动）成具有约150°的拐角角和15°壁倾斜到Y轴的形状。然后施加0.15Ec的翻转电场以恢复自然的六边形形状，并且150°角形状变为具有30°斜率的平坦壁（向外移动）。从角畴的角度分析了内、外畴运动时角畴形状的差异。
A mesospheric approach based on a simple microscopic 2D Ising model in a hexagonal lattice plane is proposed to explain macroscopic “asymmetric in-out domain wall motion” observation in the (0001) plane of MgO-doped stoichiometric lithium niobate. Under application of an electric field that was higher than the conventional coercive field (Ec) to the ferroelectric crystal, a natural hexagonal domain was obtained with walls that were parallel to the Y-axis of the crystal. When a fraction of the coercive field of around 0.1Ec is applied in the reverse direction, this hexagonal domain is shrunk (moved inward) from the corner site into a shape with a corner angle of around 150° and 15° wall slopes to the Y-axis. A flipped electric field of 0.15Ec is then applied to recover the natural hexagonal shape, and the 150° corner shape changes into a flat wall with 30° slope (moved outward). The differences in corner domain shapes between inward and outward domain motion were analyzed theoretically in terms of corner a...