BiFeO3 Films under Tensile Epitaxial Strain from First Principles

被引：54

作者：

Dupe, B. ^{[1
]}

Prosandeev, S. ^{[3
,4
]}

Geneste, G. ^{[2
]}

Dkhil, B. ^{[1
]}

Bellaiche, L. ^{[3
,4
]}

机构：

[1] Ecole Cent Paris, Lab Struct Proprietes & Modelisat Solides, CNRS, UMR 8580, F-92295 Chatenay Malabry, France

[2] CEA, DAM, DIF, F-91297 Arpajon, France

[3] Univ Arkansas, Inst Nanosci & Engn, Fayetteville, AR 72701 USA

[4] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 23期

基金：

美国国家科学基金会;

关键词：

INITIO MOLECULAR-DYNAMICS; PHASE-DIAGRAMS; THIN-FILMS; SIMULATION; BOUNDARY; METALS;

D O I：

10.1103/PhysRevLett.106.237601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Density-functional calculations are performed to predict structural and magnetic properties of (001) BiFeO3 films under tensile epitaxial strain. These films remain monoclinic (Cc space group) for misfit strains between 0% and approximate to 8%, with the polarization, tilt axis and magnetization all rotating when varying the strain. At a tensile strain approximate to 8%, these films undergo a first-order phase transition towards an orthorhombic phase (Ima2 space group). In this novel phase, the polarization and tilt axis lie in the epitaxial plane, while the magnetization is along the out-of-plane direction and the direction of the antiferromagnetic vector is unchanged by the phase transition. An unexpected additional degree of freedom, namely, an antiphase arrangement of Bi atoms, is also found for all tensile strains.

引用

页数：4

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