能量稳定的La(2/3)Sr(1/3)MnO(3)/四方相BiFeO3多铁性超晶格的优异性能

Superior Properties of Energetically Stable La(2/3)Sr(1/3)MnO(3)/Tetragonal BiFeO3 Multiferroic Superlattices.

作者信息

Feng Nan, Mi Wenbo, Wang Xiaocha, Cheng Yingchun, Schwingenschlögl Udo

机构信息

†Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology, Faculty of Science, Tianjin University, Tianjin 300072, China.

§Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States.

出版信息

ACS Appl Mater Interfaces. 2015 May 20;7(19):10612-6. doi: 10.1021/acsami.5b02436. Epub 2015 May 11.

DOI:10.1021/acsami.5b02436

PMID:25928202

Abstract

The superlattice of energetically stable La2/3Sr1/3MnO3 and tetragonal BiFeO3 is investigated by means of density functional theory. The superlattice as a whole exhibits a half-metallic character, as is desired for spintronic devices. The interfacial electronic states and exchange coupling are analyzed in details. We demonstrate that the interfacial O atoms play a key role in controlling the coupling. The higher ferroelectricity of tetragonal BiFeO3 and stronger response to the magnetic moments in the La2/3Sr1/3MnO3/BiFeO3 superlattice show a strongly enhanced electric control of the magnetism as compared to the rhombohedral one. Therefore, it is particularly practical interest in the magnetoelectrically controlled spintronic devices.

摘要

采用密度泛函理论研究了能量稳定的La2/3Sr1/3MnO3与四方相BiFeO3的超晶格。整个超晶格呈现出半金属特性，这是自旋电子器件所期望的。详细分析了界面电子态和交换耦合。我们证明界面O原子在控制耦合中起关键作用。与菱方相的La2/3Sr1/3MnO3/BiFeO3超晶格相比，四方相BiFeO3的较高铁电性以及对La2/3Sr1/3MnO3中磁矩的更强响应显示出对磁性的电控制得到了显著增强。因此，这对于磁电控制的自旋电子器件具有特别实际的意义。