铁电性
材料科学
凝聚态物理
偶极子
去极化
纳米技术
电介质
光电子学
物理
量子力学
医学
内分泌学
作者
Haoying Sun,Jiahui Gu,Yongqiang Li,Tula R. Paudel,Di Liu,Jierong Wang,Yipeng Zang,Chengyi Gu,Jiangfeng Yang,Wenjie Sun,Zheng‐Bin Gu,Evgeny Y. Tsymbal,Jun‐Ming Liu,Houbing Huang,Di Wu,Yuefeng Nie
标识
DOI:10.1103/physrevlett.130.126801
摘要
The increasing miniaturization of electronics requires a better understanding of material properties at the nanoscale. Many studies have shown that there is a ferroelectric size limit in oxides, below which the ferroelectricity will be strongly suppressed due to the depolarization field, and whether such a limit still exists in the absence of the depolarization field remains unclear. Here, by applying uniaxial strain, we obtain pure in-plane polarized ferroelectricity in ultrathin SrTiO_{3} membranes, providing a clean system with high tunability to explore ferroelectric size effects especially the thickness-dependent ferroelectric instability with no depolarization field. Surprisingly, the domain size, ferroelectric transition temperature, and critical strain for room-temperature ferroelectricity all exhibit significant thickness dependence. These results indicate that the stability of ferroelectricity is suppressed (enhanced) by increasing the surface or bulk ratio (strain), which can be explained by considering the thickness-dependent dipole-dipole interactions within the transverse Ising model. Our study provides new insights into ferroelectric size effects and sheds light on the applications of ferroelectric thin films in nanoelectronics.
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