Ground state monoclinic (Mb) phase in (110)c BiFeO3 epitaxial thin films

Xu, Guangyong; Li, Jiefang; Viehland, Dwight

doi:10.1063/1.2392818

Cited by 48 publications

(29 citation statements)

References 21 publications

(19 reference statements)

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“…Domain formation is established as a mechanism for accommodating the stress. We propose that the monoclinic domains observed here in LaCoO 3 materials may also be of importance for stress accommodation in other rhombohedral perovskites such as magnetoresistant Sr doped LaMnO 3 [31,32] and multiferroic BiFeO 3 [33,34] . Careful choice of chemical substitution in the film and/or substrate might give a designed lattice mismatch between film and substrate in order to tailor a specific ferroic domain pattern.…”

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confidence: 91%

Monoclinic Ferroelastic Domains in LaCoO₃‐Based Perovskites

et al. 2007

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LaCoO 3 -materials have received considerable attention due to their novel magnetic properties [1][2][3] and mixed ionicelectronic conductivity at elevated temperatures leading to exciting applications such as electrodes in solid oxide fuel cells [4] and oxygen permeable membranes.[5] Perovskites such as LaCoO 3 and related materials like LaAlO 3 undergo a displacive phase transition from a paraelastic cubic perovskite with space group Pm 3m at high temperatures to a ferroelastic rhombohedral perovskite with space group R 3c. [6][7][8][9][10] Toughening of the materials is particularly beneficial for membrane applications. Ferroelastic domain switching in LaCoO 3 -materials under mechanical load may increase the fracture toughness of the materials.[11] Microstructure investigations of the ferroelastic domains and switching mechanisms in LaCoO 3 -materials are therefore interesting in order to understand the materials′ mechanical behavior. In this work we report a detailed transmission electron microscopy (TEM) analysis of the ferroelastic domains in LaCoO 3 -based materials. In addition to the well known ferroelastic domains formed by deformation twinning in rhombohedral perovskites, a monoclinic structure is observed by TEM in LaCoO 3 -based materials. The second order improper paraelastic to ferroelastic phase transition in LaCoO 3 -materials doubles the periodicity along the threefold axis, which becomes the unique axis of the rhombohedral ferroelastic state. The phase transition results in the well known deformation twinning (ferroelastic twin domain [12]

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Monoclinic Ferroelastic Domains in LaCoO₃‐Based Perovskites

et al. 2007

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“…4b). The similar monoclinic structure model is also introduced in this orientation [19] ( Fig. 4c and d).…”

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confidence: 98%

Domain Control in Multiferroic BiFeO₃ through Substrate Vicinality

et al. 2007

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Control over ferroelectric polarization variants in BiFeO 3 films through the use of various vicinal SrTiO 3 substrates is demonstrated. The ferroelectric polarization variants in these films are characterized by piezoelectric force microscopy and the corresponding structural variants are carefully analyzed and confirmed by X-ray diffraction. Implementation of this approach has given us the ability to create single domain BiFeO 3 films on (001), (110), and (111) surfaces. The piezo/ ferroelectric properties of the BiFeO 3 films, in turn, can be tailored through this approach. Such results are very promising for continued exploration of BiFeO 3 films and provide a template for detailed multiferroic-coupling studies in the magnetoelectric BiFeO 3 system. Magnetoelectric coupling in multiferroic materials has attracted much attention because of the intriguing science underpinning this phenomenon. Additionally, there is an exciting potential for applications and devices that take advantage of these materials with multiple order parameters. [1][2][3][4] BiFeO 3 (BFO) is a room temperature, single-phase magnetoelectric multiferroic with a ferroelectric Curie temperature of ∼ 1103 K [5] and an antiferromagnetic Néel temperature of ∼ 643 K.[6] Recent studies of BFO thin films have shown the existence of a large ferroelectric polarization, as well as a small net magnetization of the Dzyaloshinskii-Moriya type resulting from a canting of the antiferromagnetic sublattice. [7,8] The ferroelectric polarization in BFO can have orientations along the four cube diagonals (<111>), and the direction of the polarization can be changed by ferroelectric and ferroelastic switching. [9] Our previous studies have shown coupling between ferroelectricity and antiferromagnetism in BFO thin films resulting from the coupling of both antiferromagnetic and ferroelectric domains to the underlying ferroelastic domain switching events.[10] Such a study was a crucial first step in the exploration of approaches to control and manipulate magnetic properties using an electric field. It was also noted, however, that these films exhibit a very complicated domain structure, which complicates the interpretation of the fundamental properties of this system as well as the interactions across hetero-interfaces. The lack of large single crystals of the desired crystallographic orientation provokes another motivation to explore approaches to create "single crystalline" epitaxial films that are free of ferroelectric/ferroelastic domains. Recent studies have explored the ability to control the ferroelectric domain configuration, which is formed after the phase transformation, through substrate engineering. [11,12] In this study, we demonstrate an approach to control the ferroelectric domain structure in BFO films through the use of vicinal SrTiO 3 (STO) substrates. This has enabled us to create thin films that "mimic" the primary crystal facets of the pseudo-cubic unit cell, namely single domain (100), (110), and (111) surfaces. The ferroelectric domain structu...

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“…Since the crystal structure and/or lattice parameters of the substrates are different from those of BFO material, BFO thin films are expected to be under lattice stress/strain, which is closely related to increased polarization values as well as other physical properties in epitaxial BFO thin films. Thus, considerable experimental and theoretical efforts have been devoted to understand the lattice stress/strain effects on epitaxial BFO films that present lattice distortions found in rhombohedral unit cell of bulk BFO6101112 and also different BFO crystal unit cell structures1314151617181920. Recently, it was suggested that, while BFO thin films are likely to possess tetragonal and/or monoclinic structures (denoted as M C and M A ) under compressive stress, they rather grow as orthorhombic and/or monoclinic structures of a different type (M B ) under tensile stress21.…”

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confidence: 99%

“…However, the precise crystal models that can explain experimentally found highly stressed BFO are rather unclear as has been pointed out very recently2223. Most of the experimental reports dealing with strain effects on epitaxially grown BFO films are making discussions based on lattice parameter changes and/or unit cell distortion61011121314151617181920. On the other hand, it is worth noting that when those lattice parameter changes and/or unit cell distortions occur in epitaxially grown BFO films, locations of basis atoms in the unit cell change as well, which lead to corresponding alteration in its reciprocal space in terms of locations, symmetries, and shapes in Bragg’s reflections.…”

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confidence: 99%

Elucidation of crystal and electronic structures within highly strained BiFeO3 by transmission electron microscopy and first-principles simulation

Bae

Kovács

Zhao

et al. 2017

Sci Rep

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Crystal and electronic structures of ~380 nm BiFeO3 film grown on LaAlO3 substrate are comprehensively studied using advanced transmission electron microscopy (TEM) technique combined with first-principles theory. Cross-sectional TEM images reveal the BiFeO3 film consists of two zones with different crystal structures. While zone II turns out to have rhombohedral BiFeO3, the crystal structure of zone I matches none of BiFeO3 phases reported experimentally or predicted theoretically. Detailed electron diffraction analysis combined with first-principles calculation allows us to determine that zone I displays an orthorhombic-like monoclinic structure with space group of Cm (=8). The growth mechanism and electronic structure in zone I are further discussed in comparison with those of zone II. This study is the first to provide an experimentally validated complete crystallographic detail of a highly strained BiFeO3 that includes the lattice parameter as well as the basis atom locations in the unit cell.

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Ground state monoclinic (Mb) phase in (110)c BiFeO3 epitaxial thin films

Cited by 48 publications

References 21 publications

Monoclinic Ferroelastic Domains in LaCoO₃‐Based Perovskites

Monoclinic Ferroelastic Domains in LaCoO₃‐Based Perovskites

Domain Control in Multiferroic BiFeO₃ through Substrate Vicinality

Elucidation of crystal and electronic structures within highly strained BiFeO3 by transmission electron microscopy and first-principles simulation

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Ground state monoclinic (Mb) phase in (110)c BiFeO3 epitaxial thin films

Cited by 48 publications

References 21 publications

Monoclinic Ferroelastic Domains in LaCoO3‐Based Perovskites

Monoclinic Ferroelastic Domains in LaCoO3‐Based Perovskites

Domain Control in Multiferroic BiFeO3 through Substrate Vicinality

Elucidation of crystal and electronic structures within highly strained BiFeO3 by transmission electron microscopy and first-principles simulation

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Monoclinic Ferroelastic Domains in LaCoO₃‐Based Perovskites

Monoclinic Ferroelastic Domains in LaCoO₃‐Based Perovskites

Domain Control in Multiferroic BiFeO₃ through Substrate Vicinality