Polarization switching dynamics governed by the thermodynamic nucleation process in ultrathin ferroelectric films

被引:85
作者
Jo, J. Y. [1 ]
Kim, D. J.
Kim, Y. S.
Choe, S. -B.
Song, T. K.
Yoon, J. -G.
Noh, T. W.
机构
[1] Seoul Natl Univ, Dept Phys & Astron, FPRD, Seoul 151747, South Korea
[2] Changwon Natl Univ, Sch Nano Adv Mat, Gyeongnam 641773, South Korea
[3] Univ Suwon, Dept Phys, Suwon 445743, Gyeonggi Do, South Korea
关键词
ENHANCEMENT; THICKNESS;
D O I
10.1103/PhysRevLett.97.247602
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
In most ferroelectrics, the domain nucleation barrier (U-*) is thermally insurmountable; this is called "Landauer's paradox." However, we showed that, in ultrathin films, the large depolarization fields could lower U-* to a level comparable to thermal energy (k(B)T), resulting in power-law decay of polarization. We empirically found a universal relation between the power-law decay exponent and U-*/k(B)T. This relation will provide a practical but fundamental limit for capacitor-type ferroelectric devices, analogous to the superparamagnetic limit for magnetic memory devices.
引用
收藏
页数:4
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