A5079270948- Multiferroics and related materials
- Integrated Circuits and Semiconductor Failure Analysis
- Electronic and Structural Properties of Oxides
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Advanced Condensed Matter Physics
- Metal and Thin Film Mechanics
- Advancements in Solid Oxide Fuel Cells
- Advanced Surface Polishing Techniques
- Nuclear Materials and Properties
- Advancements in Photolithography Techniques
- Industrial Vision Systems and Defect Detection
- Semiconductor materials and devices
- Iron-based superconductors research
- Ion-surface interactions and analysis
- Corporate Taxation and Avoidance
- Electron and X-Ray Spectroscopy Techniques
- Organic Electronics and Photovoltaics
- Microstructure and mechanical properties
- Fusion materials and technologies
- Magnetic properties of thin films
- Advanced Memory and Neural Computing
- Conducting polymers and applications
Texas A&M University
2012-2020
GlobalFoundries (United States)
2018-2020
Louisiana Tech University
2008-2009
We design and create a unique cell geometry of templated micrometer-thick epitaxial nanocomposite films which contain ~20 nm diameter yttria-stabilized ZrO2 (YSZ) nanocolumns, strain coupled to SrTiO3 matrix. The ionic conductivity these nanocolumns is enhanced by over 2 orders magnitude compared plain YSZ films. Concomitant with the higher conduction finding that in have much crystallinity orientation, Hence, "oxygen migration highways" are formed desired out-of-plane direction. This...
Metamaterials made of nanoscale inclusions or artificial unit cells exhibit exotic optical properties that do not exist in natural materials. Promising applications, such as super-resolution imaging, cloaking, hyperbolic propagation, and ultrafast phase velocities have been demonstrated based on mostly micrometer-scale metamaterials few metamaterials. To date, most are created using costly tedious fabrication techniques with limited paths toward reliable large-scale fabrication. In this...
Abstract Memristors with excellent scalability have the potential to revolutionize not only field of information storage but also neuromorphic computing. Conventional metal oxides are widely used as resistive switching materials in memristors. Interface‐type memristors based on ferroelectric emerging alternatives development high‐performance memory devices. A clear understanding mechanisms this type memristors, however, is still its early stages. By comparing bipolar different systems, it...
The oxygen pressure effect on the structural and ferroelectric properties have been studied in epitaxial BaTiO3 (BTO)/SrRuO3/SrTiO3 (001) heterostructures grown by pulsed laser deposition. It is found that a sensitive parameter, which can influence characteristics of oxide films many aspects. out-of-plane lattice tetragonality, (c/a) Ti/Ba ratio monotonously decrease as increases from 5 mTorr to 200 mTorr. Microstructural study shows growth varies dense large grained structure with smooth...
Fast ion transport channels at interfaces in thin films have attracted great attention due to a range of potential applications for energy materials and devices, for, solid oxide fuel cells, sensors, memories. Here, it is shown that vertical nanocomposite heteroepitaxial SrZrO 3 –RE 2 O (RE = Sm, Eu, Gd, Dy, Er) the ionic conductivity composite can be tuned strongly enhanced using embedded, stiff, nanopillars RE . With increasing lattice constant from Er Sm , found tensile strain increases...
Self-assembled BiFeO3:CoFe2O4 (BFO:CFO) vertically aligned nanocomposite thin films have been fabricated on SrTiO3 (001) substrates using pulsed laser deposition. The strain relaxation mechanism between BFO and CFO with a large lattice mismatch has studied by X-ray diffraction transmission electron microscopy. as-prepared exhibit enhanced perpendicular magnetic anisotropy as the composition increases. Different sources investigated, suggesting that spin-flop coupling antiferromagnetic...
Epitaxial (BaTiO3)0.5(CeO2)0.5 films have been deposited in vertically aligned nanocomposite form on SrTiO3/TiN buffered Si substrates to achieve high-quality ferroelectrics Si. The thin TiN seed layer promotes the epitaxial growth of SrTiO3 buffer Si, which turn is essential for structure. X-ray diffraction and transmission electron microscopy characterization show that consist distinct c-axis oriented BaTiO3 CeO2 phases. Polarization measurements BaTiO3-CeO2 are actually ferroelectric at...
Heterointerfaces in manganite-based heterostructures either layered or vertical geometry control their magnetotransport properties. Instead of using spin-polarized tunneling across the interface, a unique approach based on magnetic exchange coupling along interface to properties has been demonstrated. By ferromagnetic La0.7Sr0.3MnO3 and antiferromagnetic NiO an epitaxial vertically aligned nanocomposite (VAN) architecture, dynamic reversible switch resistivity between two distinct biased...
Ordered arrays of metallic nanopillars embedded in a ceramic matrix have recently attracted considerable interest for their multifunctionality advanced devices. A number hurdles need to be overcome achieving practical devices, including selections metal-ceramic combination, creation tunable and ordered structure, control strain state. In this article, we demonstrate major advances create such fine nanoscale i.e., epitaxial self-assembled vertically aligned composite, one-step growth using...
A unique quasi-one-dimensionally channeled nanomaze structure has been self-assembled in the (La0.7Sr0.3MnO3)1−x:(ZnO)x vertically aligned nanocomposites (VANs). Significantly enhanced magnetotransport properties have achieved by tuning ZnO composition x. The heteroepitaxial VAN thin films, free of large angle grain boundaries, exhibit a maximum low-field magnetoresistance (LFMR) 75% (20 K and 1 T). LFMR close to percolation threshold is attributed spin-polarized tunneling through...
Vertically aligned nanocomposites (VAN) combined ferrimagnetic CoFe2O4 with non-magnetic CeO2 ((CoFe2O4)x:(CeO2)1−x) in different phase ratios (x = 10%, 30% to 50%) have been grown by a pulsed laser deposition technique. Various unique magnetic domain structures form based on the VAN compositions and growth conditions. Anisotropic tunable properties demonstrated. These ordered nanostructures incorporated into YBa2Cu3O7−δ thin films as both cap buffer layers enhance flux pinning of...
Vertically aligned nanocomposite (VAN) (La0.7Sr0.3MnO3)1−x:(CeO2)x (LSMO:CeO2) thin films have been grown on SrTiO3 (001) substrates by pulsed laser deposition. Tunable magnetoresistance properties as well microstructures are demonstrated in these VAN modulating the film composition (x = 0, 0.3, 0.4, 0.45, 0.5, and 0.55). The sample of x 0.3 shows a large low-field (LFMR) high temperature range, i.e., over 10% at range 280 K to 320 under 1 T with peak value ∼13.5% 310 K. In addition, vast...
Bi2FeMnO6 (BFMO) thin films with both conventional pseudocubic structure and novel supercell have been grown on SrTiO3 (001) substrates different thicknesses of CeO2 buffer layers (ranging from 6.7 to 50.0 nm) using pulsed laser deposition. The correlation between the thickness layer BFMO shows that layer, as nm, is sufficient in triggering structure. This may be ascribed interfacial strain which also serves a seed layer. found critical control microstructure magnetism formed structures....