CAJ | 학술논문

为研究薄膜厚度对外延铁电薄膜铁电性能的影响,应用与时间有关的Ginzburg-Landau方程,在同时考虑应力和表面效应的条件下,获得了不同应力情况下,不同厚度铁电薄膜的电滞回线及蝶形应变迟滞回线.计算结果显示,处于不同应力值下的铁电薄膜,剩余极化强度和场致应变随着薄膜厚度的增加而增加.而矫顽场随着薄膜厚度的增加而减小.证明了不同应力情况下,薄膜厚度对剩余极化强度和矫顽场的影响是不能忽略的.这种变化趋势与实验结果的情况是一致的.
위연구박막후도대외연철전박막철전성능적영향,응용여시간유관적Ginzburg-Landau방정,재동시고필응력화표면효응적조건하,획득료불동응력정황하,불동후도철전박막적전체회선급접형응변지체회선.계산결과현시,처우불동응력치하적철전박막,잉여겁화강도화장치응변수착박막후도적증가이증가.이교완장수착박막후도적증가이감소.증명료불동응력정황하,박막후도대잉여겁화강도화교완장적영향시불능홀략적.저충변화추세여실험결과적정황시일치적.
By taking both stress and surface effects into account, the effect of thickness on ferroelectric films was investigated by using the time-dependent Ginzburg-Landau equation. Polarization hysteresis and butterfly hysteresis of various film thicknesses under different stresses were numerically simulated. The results show that under different stresses, the coercive field decreases with film thickness, while the remnant polarization and field-induced strain increase with film thickness. These trends are consistent with experimental results and verify that the effect of film thickness on remnant polarization strength and the coercive field should not be neglected.