Fractal dimension and size scaling of domains in thin films of multiferroic BiFeO3

被引：255

作者：

Catalan, G. ^{[1
]}

Bea, H. ^{[2
,3
]}

Fusil, S. ^{[2
,3
]}

Bibes, M. ^{[2
,3
]}

Paruch, P. ^{[4
]}

Barthelemy, A. ^{[2
,3
]}

Scott, J. F. ^{[1
]}

机构：

[1] Univ Cambridge, Dept Earth Sci, Ctr Ferro, Cambridge CB2 3EQ, England

[2] CNRS Thales, Unite Mixte Phys, F-91767 Palaiseau, France

[3] Univ Paris 11, F-91405 Orsay, France

[4] Cornell Univ, Atom & Solid State Phys Lab, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.100.027602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Domains in ferroelectric films are usually smooth, stripelike, very thin compared with magnetic ones, and satisfy the Landau-Lifshitz-Kittel scaling law (width proportional to square root of film thickness). However, the ferroelectric domains in very thin films of multiferroic BiFeO3 have irregular domain walls characterized by a roughness exponent 0.5-0.6 and in-plane fractal Hausdorff dimension H-parallel to=1.4 +/- 0.1, and the domain size scales with an exponent 0.59 +/- 0.08 rather than 1/2. The domains are significantly larger than those of other ferroelectrics of the same thickness, and closer in size to those of magnetic materials, which is consistent with a strong magnetoelectric coupling at the walls. A general model is proposed for ferroelectrics, ferroelastics or ferromagnetic domains which relates the fractal dimension of the walls to domain size scaling.

引用

页数：4

共 42 条

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