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Skin layer of BiFeO3 single crystals

AuthorsFerrer, Pilar ; Narváez, Jackeline ; Catalán, Gustau
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review Letters 106(23): 236101 (2011)
AbstractA surface layer (“skin”) different from the bulk was found in single crystals of BiFeO3. Impedance analysis and grazing incidence x-ray diffraction reveal a phase transition at T*∼275±5 °C that is confined within the surface of BiFeO3. X-ray photoelectron spectroscopy and refraction-corrected x-ray diffraction as a function of incidence angle and photon wavelength indicate a reduced electron density and an elongated out-of-plane lattice parameter within a few nanometers of the surface. The skin will affect samples with large surface to volume ratios, as well as devices that rely on interfacial coupling such as exchange bias.
Description4 páginas, 4 figuras.-- PACS numbers: 68.35.B-, 61.05.cp, 68.35.Rh, 75.85.+t.-- et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.106.236101
Appears in Collections:(CIN2) Artículos
(ICMM) Artículos
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