Here we report by phase field simulations that in ferroelectric nanodots the single domain generated from the vortex under external electric field will transform back to the vortex structure after removal of the field, which could offer large recoverable electrostrain during the process. Moreover, it is found that the recoverable electrostrain maintains a large value and could exist over a wide temperature range. The good recoverability of the vortex structure and electrostrain in the ferroelectric nanodots is found to be mainly ascribed to the dipole-dipole interaction energy and the elastic interaction energy in the system. This work may shed light on the development of miniaturized actuators in Micro-Electro-Mechanical System (MEMS) or Nano-Electromechanical System (NEMS).

在这里，我们通过相场模拟报告，在铁电纳米点中，在外部电场下从涡旋产生的单域将在去除场后转变回涡旋结构，这可以在此过程中提供大的可恢复电应变。此外，发现可恢复的电应变保持很大的值并且可以存在于很宽的温度范围内。发现铁电纳米点中涡旋结构和电应变的良好可恢复性主要归因于系统中的偶极 - 偶极相互作用能和弹性相互作用能。这项工作可能会阐明微机电系统 (MEMS) 或纳米机电系统 (NEMS) 中微型执行器的开发。