Switchable polar spirals in tricolor oxide superlattices

被引：26

作者：

Hong, Zijian ^{[1
,2
]}

Chen, Long-Qing ^{[1
]}

机构：

[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[2] Carnegie Mellon Univ, Dept Mech Engn, Pittsburgh, PA 15213 USA

来源：

ACTA MATERIALIA | 2019年 / 164卷

基金：

美国国家科学基金会;

关键词：

Polar spiral; Thermal stability; Multiferroics; Switching dynamics; Phase-field simulations; FERROELECTRIC DOMAIN-STRUCTURES; POLARIZATION; FEASIBILITY; ENHANCEMENT; NANODOMAINS; STABILITY; SUBSTRATE; VORTICES; BOUNDARY;

D O I：

10.1016/j.actamat.2018.10.053

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

There are increasing evidences that ferroelectric states at the nanoscale can exhibit fascinating topological structures including polar vortices and skyrmions, akin to those observed in the ferromagnetic systems. Here we report the discovery of a new type of polar topological structure, an ordered array of nanoscale spirals, in the PbTiO3/BiFeO3/SrTiO3 tricolor ferroelectric superlattice system obtained via phase-field simulations. This polar spiral structure is composed of fine ordered semi-vortex arrays with vortex cores forming a wavy distribution. It is demonstrated that the tricolor system has an ultrahigh Curie temperature of similar to 1000 K and a temperature of similar to 800 K for the phase transformation from spiral structure to in-plane orthorhombic domain structure, demonstrating a great thermal stability. The periodicity phase-diagram is constructed, showing multiple phases from inplane domain, polar spiral, and polar vortex to flux-closure with increasing ferroelectric layer thickness. Moreover, the spiral structure has a net in-plane polarization that could be switched by an experimentally-feasible irrotational in-plane field. The switching process involves a metastable vortex state and is fully reversible. This discovery could open up a new routine to design novel multiferroic topological structures with enhanced stability and tunability towards potential future applications in next-generation electronics. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：493 / 498

页数：6

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