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

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

2007-07-30

arxiv.org/abs/0707.4377v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.027602

We have analyzed the morphology of ferroelectric domains in very thin films of multiferroic BiFeO3. Unlike the more common stripe domains observed in thicker films BiFeO3 or in other ferroics, the domains tend not to be straight, but irregular in shape, with significant domain wall roughening leading to a fractal dimensionality. Also contrary to what is usually observed in other ferroics, the domain size appears not to scale as the square root of the film thickness. A model is proposed in which the observed domain size as a function of film thickness can be directly linked to the fractal dimension of the domains.

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