Role of modulus mismatch in vertically aligned nanocomposite formation during spinodal decomposition in constrained films

Liao, Xiangbiao; Ni, Yong; Yang, Haijian; He, Ling

doi:10.1063/1.4823700

Cited by 8 publications

(3 citation statements)

References 39 publications

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“…Understanding microstructure formation and evolution in nanocomposites has gained extensive attention from theory perspectives. Simulation results show that elastic interactions between these two phases and substrate constraint are critical to microstructure formation and evolution . A 3D phase field microelasticity model predicts that it is necessary to have both modulus and lattice mismatch for the formation of VAN structures.…”

Section: Strain Defect and Microstructure Correlationmentioning

confidence: 98%

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Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

et al. 2018

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Complex metal oxides, which show a variety of functional properties such as ferromagnetism, ferroelectricity, multi-ferroelectricity, superconductivity, and ionic conduction, have attracted much attention in the past decades. These exotic physical properties arise from a complex hierarchy of competing interactions among spin, charge, orbital, and lattice degrees of freedom. The development of advanced characterization techniques such as electron microscopy, neutron scattering, synchrotron scattering and imaging, spectroscopy at high magnetic fields, and others has enabled us to study the interactions among these degrees of freedom coupled with strain, defect, and interface Vertically aligned nanocomposite thin films with ordered two phases, grown epitaxially on substrates, have attracted tremendous interest in the past decade. These unique nanostructured composite thin films with large vertical interfacial area, controllable vertical lattice strain, and defects provide an intriguing playground, allowing for the manipulation of a variety of functional properties of the materials via the interplay among strain, defect, and interface. This field has evolved from basic growth and characterization to functionality tuning as well as potential applications in energy conversion and information technology. Here, the remarkable progress achieved in vertically aligned nanocomposite thin films from a perspective of tuning functionalities through control of strain, defect, and interface is summarized. Thin FilmsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201803241. 12 11 12where c 11 and c 12 are elastic moduli of the film material. Epitaxial strain gradually changes with film thickness in perovskite manganites. Figure 3 shows reciprocal space mapping or RSM (103) of La 0.7 Ca 0.3 MnO 3 (LCMO) films on STO (001) substrates. It captures the gradual strain relaxation process with increasing film thickness in manganite thin films. When the film is very thin, the interface is coherent with

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Section: Strain Defect and Microstructure Correlationmentioning

confidence: 98%

“…It shows that larger modulus difference favors the formation of vertical nanopillars. In addition, the stiffer phase often forms pillars while the softer phase forms matrix . It should be noted that both modulus and lattice mismatch play key roles in the vertical strain tuning .…”

Section: Strain Defect and Microstructure Correlationmentioning

confidence: 99%

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

et al. 2018

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“…Artificially constructed horizontal oxide heterointerfaces in the form of superlattices, multilayers, and/or heterostructures have been widely investigated to manipulate physical properties 7 8 9 . Recently, nanocomposites with a vertical interface network are emerging as an alternative approach to tune physical properties since microstructure, interfacial coupling, and lattice strain can be tailored from 2D to 3D 10 11 12 13 14 15 16 17 18 19 . The lack of substrate clamping effect and the presence of large interfacial area in thick vertically aligned nanocomposite films in comparison with conventional horizontal heterostructures make such a new 3D architecture attractive 20 to tune the functionalities of materials 21 .…”

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confidence: 99%

Evolution of microstructure, strain and physical properties in oxide nanocomposite films

Chen

Weigand

et al. 2014

Sci Rep

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We, using LSMO:ZnO nanocomposite films as a model system, have studied the effect of film thickness on the physical properties of nanocomposites. It shows that strain, microstructure, as well as magnetoresistance strongly rely on film thickness. The magnetotransport properties have been fitted by a modified parallel connection channel model, which is in agreement with the microstructure evolution as a function of film thickness in nanocomposite films on sapphire substrates. The strain analysis indicates that the variation of physical properties in nanocomposite films on LAO is dominated by strain effect. These results confirm the critical role of film thickness on microstructures, strain states, and functionalities. It further shows that one can use film thickness as a key parameter to design nanocomposites with optimum functionalities.

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