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Título: | Local properties of the surface layer(s) of BiFeO3 single crystals |
Autor: | Domingo, Neus CSIC ORCID; Narváez, Jackeline CSIC; Alexe, Marin; Catalán, Gustau CSIC ORCID | Fecha de publicación: | 2013 | Editor: | American Institute of Physics | Citación: | Journal of Applied Physics 113(18): 187220 (2013) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1063/1.4801974 | URI: | http://hdl.handle.net/10261/99416 | DOI: | 10.1063/1.4801974 | Identificadores: | doi: 10.1063/1.4801974 issn: 0021-8979 e-issn: 1089-7550 |
Aparece en las colecciones: | (CIN2) Artículos |
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Local properties of the surface.pdf | 3,18 MB | Adobe PDF | Visualizar/Abrir |
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