Unusual phase transitions in ferroelectric nanodisks and nanorods

被引:785
作者
Naumov, II [1 ]
Bellaiche, L [1 ]
Fu, HX [1 ]
机构
[1] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA
基金
美国国家科学基金会;
关键词
D O I
10.1038/nature03107
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Bulk ferroelectrics undergo structural phase transformations at low temperatures, giving multi-stable ( that is, multiple-minimum) degenerate states with spontaneous polarization. Accessing these states by applying, and varying the direction of, an external electric field is a key principle for the operation of devices such as non-volatile ferroelectric random access memories(1) (NFERAMs). Compared with bulk ferroelectrics, low-dimensional finite ferroelectric structures promise to increase the storage density of NFERAMs 10,000-fold(2). But this anticipated benefit hinges on whether phase transitions and multi-stable states still exist in low-dimensional structures. Previous studies have suggested that phase transitions are impossible in one-dimensional systems(3-5), and become increasingly less likely as dimensionality further decreases(3-6). Here we perform ab initio studies of ferroelectric nanoscale disks and rods of technologically important Pb(Zr, Ti) O-3 solid solutions, and demonstrate the existence of previously unknown phase transitions in zero-dimensional ferroelectric nanoparticles. The minimum diameter of the disks that display low-temperature structural bistability is determined to be 3.2 nm, enabling an ultimate NFERAM density of 60 x 10(12) bits per square inch that is, five orders of magnitude larger than those currently available(7). Our results suggest an innovative use of ferroelectric nanostructures for data storage, and are of fundamental value for the theory of phase transition in systems of low dimensionality.
引用
收藏
页码:737 / 740
页数:4
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