Misorientation Control and Functionality Design of Nanopillars in Self-Assembled Perovskite−Spinel Heteroepitaxial Nanostructures

Liao, Shu-Hsien; Tsai, Pei Yu; Chen, Liang; Liu, Heng Jui; Yang, Jinn‐Chuang; Lin, Shaw‐Tao; Lai, Chih‐Huang; Chu, Ying Hao

doi:10.1021/nn200880t

Cited by 67 publications

(61 citation statements)

References 19 publications

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“…Such differences in surface morphologies could be induced by the lattice parameter mismatch between CFO and BFO phases 25 . The X-ray Diffraction (XRD) patterns in Fig.…”

Section: Resultsmentioning

confidence: 99%

Magnetoelectricity of CoFe2O4 and tetragonal phase BiFeO3 nanocomposites prepared by pulsed laser deposition

Gao

Viswan

Tang

et al. 2018

Sci Rep

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The coupling between the tetragonal phase (T-phase) of BiFeO3 (BFO) and CoFe2O4 (CFO) in magnetoelectric heterostructures has been studied. Bilayers of CFO and BFO were deposited on (001) LaAlO3 single crystal substrates by pulsed laser deposition. After 30 min of annealing, the CFO top layer exhibited a T-phase-like structure, developing a platform-like morphology with BFO. Magnetic hysteresis loops exhibited a strong thickness effect of the CFO layer on the coercive field, in particular along the out-of-plane direction. Magnetic force microscopy images revealed that the T-phase CFO platform contained multiple magnetic domains, which could be tuned by applying a tip bias. A combination of shape, strain, and exchange coupling effects are used to explain the observations.

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“…Such differences in surface morphologies could be induced by the lattice parameter mismatch between CFO and BFO phases 25 . The X-ray Diffraction (XRD) patterns in Fig.…”

Section: Resultsmentioning

confidence: 99%

Magnetoelectricity of CoFe2O4 and tetragonal phase BiFeO3 nanocomposites prepared by pulsed laser deposition

Gao

Viswan

Tang

et al. 2018

Sci Rep

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“…The specific nanostructural arrangement of composite depends on the ratio of the phases as well as mismatch strains. 71 VAN films have several merits compared to laterally aligned heteroepitaxy films, as introduced in previous reviews. [54][55][56] While the growth of laterally aligned heteroepitaxy films is complicated and slow due to the need for layer-by-layer growth and perfection of each layer to maintain good heteroepitaxy, VAN films can be grown in a short time since one ablation of the target releases both species simultaneously.…”

Section: Growth Mechanisms Of Van Filmsmentioning

confidence: 99%

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Lee

MacManus‐Driscoll

2017

APL Materials

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This review provides the design principles to develop new nanoionic applications using vertically aligned nanostructured (VAN) thin films, incorporating two phases which self-assemble in one film. Tunable nanoionics has attracted great attention for energy and device applications, such as ion batteries, solid oxide fuel cells, catalysts, memories, and neuromorphic devices. Among many proposed device architectures, VAN films have strong potential for nanoionic applications since they show enhanced ionic conductivity and tunability. Here, we will review the recent progress on state-of-the-art nanoionic applications, which have been realized by using VAN films. In many VAN systems made by the inclusion of an oxygen ionic insulator, it is found that ions flow through the vertical heterointerfaces. The observation is consistent with structural incompatibility at the vertical heteroepitaxial interfaces resulting in oxygen deficiency in one of the phases and hence to oxygen ion conducting pathways. In other VAN systems where one of the phases is an ionic conductor, ions flow much faster within the ionic conducting phase than within the corresponding plain film. The improved ionic conduction coincides with much improved crystallinity in the ionically conducting nanocolumnar phase, induced by use of the VAN structure. Furthermore, for both cases Joule heating effects induced by localized ionic current flow also play a role for enhanced ionic conductivity. Nanocolumn stoichiometry and strain are other important parameters for tuning ionic conductivity in VAN films. Finally, double-layered VAN film architectures are discussed from the perspective of stabilizing VAN structures which would be less stable and hence less perfect when grown on standard substrates.

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“…[1][2][3][4] The most commonly studied system consists of ferrimagnetic CoFe 2 O 4 (CFO) pillars in a ferroelectric BiFeO 3 (BFO) matrix. It is well known that magnetic properties such as coercivity and anisotropy of the CFO pillars in the nanocomposite are governed by the pillar shape, size, strain state, and coupling with the perovskite matrix.…”

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confidence: 99%

Pillar shape modulation in epitaxial BiFeO3–CoFe2O4 vertical nanocomposite films

2014

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Self-assembled epitaxial CoFe2O4-BiFeO3 nanocomposite films, in which pillars of CoFe2O4 grow within a single crystal BiFeO3 matrix, show both ferrimagnetism and ferroelectricity. The pillars typically have a uniform cross-section, but here two methods are demonstrated to produce a width modulation during growth by pulsed laser deposition. This was achieved by growing a blocking layer of BiFeO3 to produce layers of separated pillars or pillars with constrictions, or by changing the temperature during growth to produce bowling-pin shaped pillars. Modulated nanocomposites showed changes in their magnetic anisotropy compared to nanocomposites with uniform width. The magnetic anisotropy was interpreted as a result of magnetoelastic and shape anisotropies.

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Misorientation Control and Functionality Design of Nanopillars in Self-Assembled Perovskite−Spinel Heteroepitaxial Nanostructures

Cited by 67 publications

References 19 publications

Magnetoelectricity of CoFe2O4 and tetragonal phase BiFeO3 nanocomposites prepared by pulsed laser deposition

Magnetoelectricity of CoFe2O4 and tetragonal phase BiFeO3 nanocomposites prepared by pulsed laser deposition

Research Update: Fast and tunable nanoionics in vertically aligned nanostructured films

Pillar shape modulation in epitaxial BiFeO3–CoFe2O4 vertical nanocomposite films

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