Regular nanodomain vertex arrays in BiFeO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>single crystals

Berger, Andreas; Hesse, D.; Hähnel, Angelika; Arredondo, Miryam; Alexe, Marin

doi:10.1103/physrevb.85.064104

Cited by 10 publications

(14 citation statements)

References 25 publications

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“…The actual symmetry as well as the origin of these domains remains to be determined. Of particular relevance here is the transmission electron microscopy study of Berger et al, 21 performed on the same type of samples. These authors see strikingly similar domain patterns to those reported here, even though the plane orientation of their TEM samples, (110), is different from those in the PFM study, (001).…”

Section: Discussionmentioning

confidence: 99%

Local properties of the surface layer(s) of BiFeO3 single crystals

Domingo

Narváez

Alexe

et al. 2013

Journal of Applied Physics

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The surface of BiFeO 3 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* ¼ 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 BiFeO 3 , 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. V

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Section: Discussionmentioning

confidence: 99%

Local properties of the surface layer(s) of BiFeO3 single crystals

Domingo

Narváez

Alexe

et al. 2013

Journal of Applied Physics

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“…20,21 Calculations 22 attribute their formation and stabilization to competition between long-and short-range electrostatic forces. The same domain configuration was reported in TEM specimens that were not confined to a capacitor-like geometry 20,21 and in bulk polished samples for piezoresponse force microscopy. 20 Jia et al 21 performed a comprehensive atomic-resolution investigation of this type of DW in BFO single crystals, employing negative spherical aberration imaging TEM techniques.…”

mentioning

confidence: 99%

Atomic-Level Response of the Domain Walls in Bismuth Ferrite in a Subcoercive-Field Regime

et al. 2022

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The atomic-level response of zigzag ferroelectric domain walls (DWs) was investigated with in situ bias scanning transmission electron microscopy (STEM) in a subcoercive-field regime. Atomic-level movement of a single DW was observed. Unexpectedly, the change in the position of the DW, determined from the atomic displacement, did not follow the position of the strain field when the electric field was applied. This can be explained as low mobility defect segregation at the initial DW position, such as ordered clusters of oxygen vacancies. Further, the triangular apex of the zigzag wall is pinned, but it changes its shape and becomes asymmetric under electrical stimuli. This phenomenon is accompanied by strain and bound charge redistribution. We report on unique atomic-scale phenomena at the DW level and show that in situ STEM studies with atomic resolution are very relevant as they complement, and sometimes challenge, the knowledge gained from lower resolution studies.

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“…The crystals were harvested from the flux using diluted (10%) HNO 3 and further processed by polishing. The structural properties and domain pattern of typical crystals have been previously reported . Crystal C4 is similar (same batch and processing) to the crystal used by Alexe and Hesse .…”

Section: Methodsmentioning

confidence: 79%

Electronic Origin and Tailoring of Photovoltaic Effect in BiFeO₃ Single Crystals

Yang

Bhatnagar

Alexe

2015

Adv Elect Materials

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of this effect. The present work addresses precisely this issue by studying the spectral distribution of the photoconductivity and photovoltaic effect along with their temperature dependence. We focus on the sub-band gap features and correlate their activity to the anomalous photovoltaic effect in BFO single crystals that were obtained from different growth processes and sources. We eventually demonstrate that the photovoltaic current ( I PV ) and V OC can be effectively tuned by pumping the subband gap levels via thermal and electrical fi eld treatments.BiFeO 3 single crystals were grown using original fl ux method as described elsewhere. [ 19 ] Different crystal orientation, domain pattern, grown runs, etc. were used in order to increase the degree of generality of the present study. Additionally, crystals from two different groups, one from the Schmid group in Geneva that was fabricated using the original growth process [ 19 ] and the other from Viret group, [ 16 ] were measured and compared with the in-house grown crystals. The crystals used here show different domain structure from monodomain to multidomain structure. Details on the growth, crystal and domain structure are given in the Experimental Section.The APV effect was measured in all the crystals by acquiring the current-voltage ( I -V ) characteristics ( Figure 1 a) under an illumination from a laser with a wavelength of 405 nm ( hv = 3.06 eV) and an average power intensity of 40 mW cm −2 . The time interval between two points of measurement was long enough to allow stabilization of the photocurrent and achieving the steady-state. BFO single crystals exhibited substantial APV effect and other photoelectric characteristics with V OC 's varying from 0.5 to 51 V depending on the crystals. The details have been summarized in Table S1 of the Supporting Information.The V OC is an extrinsic property of the APV and depends upon the photovoltaic current density ( J PV ), dark conductivity ( σ d ), photoconductivity ( σ ph ) that are related by the following equation given by Fridkin [ 20 ]

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Regular nanodomain vertex arrays in BiFeO3single crystals

Cited by 10 publications

References 25 publications

Local properties of the surface layer(s) of BiFeO3 single crystals

Local properties of the surface layer(s) of BiFeO3 single crystals

Atomic-Level Response of the Domain Walls in Bismuth Ferrite in a Subcoercive-Field Regime

Electronic Origin and Tailoring of Photovoltaic Effect in BiFeO₃ Single Crystals

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Regular nanodomain vertex arrays in BiFeO3single crystals

Cited by 10 publications

References 25 publications

Local properties of the surface layer(s) of BiFeO3 single crystals

Local properties of the surface layer(s) of BiFeO3 single crystals

Atomic-Level Response of the Domain Walls in Bismuth Ferrite in a Subcoercive-Field Regime

Electronic Origin and Tailoring of Photovoltaic Effect in BiFeO3 Single Crystals

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Electronic Origin and Tailoring of Photovoltaic Effect in BiFeO₃ Single Crystals