Suchergebnisse

The surface of BiFeO3 single crystals has been characterized at the local level using several AFM-based techniques. We have observed the presence of two different epilayers showing electrical and mechanical properties different from those of the bulk: a ferroelectrically dead outer skin of 5 nm sitting upon a subsurface layer that displays an extremely fine pattern of hierarchical self-ordered nanodomains. Based on the size of the nanodomains and applying a Kittel-like analysis, we argue that the nanotwinned region should be confined in a layer less than a micron deep. The superficial phase transition at T 275 °C is restricted to the outer skin layer (the dead layer), while the nanotwinned layer is insensitive to this transition. In view of the photovoltaic properties and spin-dependent transport of domain walls in BiFeO3, the existence of nanodomains (and thus a high density of domain walls) in bulk single crystals is likely to be relevant for understanding their functional properties. © 2013 AIP Publishing LLC. ; This work has been supported by the Leverhulme Trust, the project MAT2010-17771 from the Spanish Government and DFG through SFB 762. N.D. wants to acknowledge the financial support from a RyC grant of the Spanish Ministerio de Economia y Competitividad. G.C. wants to acknowledge financial support from ICREA. ; Peer Reviewed