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Phenomenological analysis of domain width in rhombohedral BiFeO3 films

Publication Type

Journal Article

Authors

Huang, C.W, L Chen, J Wang, Q He, S.Y Yang, Y.H Chu, Ramamoorthy Ramesh

DOI

10.1103/PhysRevB.80.140101

Abstract

The experimental domain size scaling law in epitaxial BiFeO3 films shows a different behavior from predictions of the conventional elastic domains: the (101)-type 71° domains are much wider than that of (100)-type 109° despite the larger domain-wall energy in (100) boundary. A phenomenological analysis for rhombohedral BiFeO3 film is proposed, and it reveals that both the depolarizing energy and the elastic energy are indispensable for the equilibrium domain structures. With the increase in the asymmetrical electrostatic boundary on the film surfaces, the dominant domain scaling mechanism changes from electrostatic-dependent domain structure to elastic-dependent one, which is consistent with the experimental data. The present results highlight the general role of depolarizing field in rhombohedral domain structures. © 2009 The American Physical Society.

Journal

Physical Review B - Condensed Matter and Materials Physics

Volume

Year of Publication

2009

ISSN

10980121

Notes

cited By 24

Research Areas

Ramesh Lab