Kittel Law in BiFeO3 Ultrathin Films: A First-Principles-Based Study

被引：26

作者：

Prosandeev, S. ^{[1
,3
]}

Lisenkov, S. ^{[2
]}

Bellaiche, L. ^{[1
]}

机构：

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

[2] Univ S Florida, Dept Phys, Tampa, FL 33620 USA

[3] So Fed Univ, Rostov Na Donu 344090, Russia

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 14期

基金：

美国国家科学基金会;

关键词：

THIN-FILMS; PHASE-TRANSITIONS; NANOSCALE CONTROL; MAGNETISM; BATIO3;

D O I：

10.1103/PhysRevLett.105.147603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A first-principles-based effective Hamiltonian is used to investigate the thickness dependency of the size of straight-walled domains in ultrathin films made of the multiferroic BiFeO3 (BFO) material. It is found that the Kittel law is followed, as in ferroelectric or ferromagnetic films. However, an original real-space decomposition of the different energetic terms of this effective Hamiltonian allows the discovery that the microscopic origins of such a law in BFO films dramatically differ from those in ferroelectric or ferromagnetic films. In particular, interactions between tilting of oxygen octahedra around the domain walls and magnetoelectric couplings near the surface (and away from the domain walls) play an important role in the observance of the Kittel law in the studied BFO films.

引用

页数：4

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