Multiferroic Dislocations in Ferroelectric PbTiO3
Multiferroic Dislocations in Ferroelectric PbTiO3
复制标题
铁电 PbTiO3 中的多铁性位错
DOI：
10.1021/acs.nanolett.7b00505
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发表时间：
2017
期刊：
影响因子：
10.8
通讯作者：
Kitamura Takayuki
中科院分区：
文献类型：
--
作者：
Shimada Takahiro;Xu Tao;Araki Yasumitsu;Wang Jie;Kitamura Takayuki
具有耦合铁电和铁磁序参数的超薄多铁性材料有望成为新的技术范例，例如超薄磁电存储器。然而，这些铁性有序及其功能在低于几纳米的基本尺寸极限时不可避免地消失。在这里，我们提出了一种新的设计策略，纳米多铁性小于临界尺寸限制的工程位错在铁电材料，即使这些晶格缺陷通常被认为是有害的。第一性原理计算表明，富钛PbTiO 3位错表现出磁性，由于当地的非化学计量的核心结构固有的。高度局域化的自旋矩与主机铁电性使这些位错作为原子尺度的多铁性通道，具有显着的磁电效应，与反铁磁-铁磁-铁磁相变响应于极化切换。因此，本研究结果提出了一个新的领域的位错（或缺陷）工程的制造的磁电多铁性和高密度电子器件。
Ultrathin multiferroics with coupled ferroelectric and ferromagnetic order parameters hold promise for novel technological paradigms, such as extremely thin magnetoelectric memories. However, these ferroic orders and their functions inevitably disappear below a fundamental size limit of several nanometers. Herein, we propose a novel design strategy for nanoscale multiferroics smaller than the critical size limit by engineering the dislocations in nonmagnetic ferroelectrics, even though these lattice defects are generally believed to be detrimental. First-principles calculations demonstrate that Ti-rich PbTiO3dislocations exhibit magnetism due to the local nonstoichiometry intrinsic to the core structures. Highly localized spin moments in conjunction with the host ferroelectricity enable these dislocations to function as atomic-scale multiferroic channels with a pronounced magnetoelectric effect that are associated with the antiferromagnetic–ferromagnetic–nonmagnetic phase transitions in response to polarization switching. The present results thus suggest a new field of dislocation (or defect) engineering for the fabrication of ultrathin magnetoelectric multiferroics and ultrahigh density electronic devices.