Fractal Dimension and Size Scaling of Domains in Thin Films of Multiferroic BiFeO 3
作者： G Catalan , H Béa , S Fusil , M Bibes , Patrycja Paruch
DOI: 10.1103/PHYSREVLETT.100.027602
关键词:
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, domains multiferroic BiFeO3 have irregular domain walls characterized by a roughness exponent 0.5–0.6 in-plane fractal Hausdorff dimension H||=1.4±0.1, size scales an 0.59±0.08 rather than (1/2). The significantly larger those other ferroelectrics same thickness, closer materials, which is consistent strong magnetoelectric coupling at walls. A general model proposed for ferroelectrics, ferroelastics or ferromagnetic relates scaling.
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