A5065601077- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Electron and X-Ray Spectroscopy Techniques
- Magnetic and transport properties of perovskites and related materials
- Surface and Thin Film Phenomena
- Advanced Electron Microscopy Techniques and Applications
- Semiconductor materials and devices
- Acoustic Wave Resonator Technologies
- Nonlocal and gradient elasticity in micro/nano structures
- Advanced Materials Characterization Techniques
- Analytical Chemistry and Sensors
- Dielectric properties of ceramics
- Force Microscopy Techniques and Applications
- Perovskite Materials and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Geophysical and Geoelectrical Methods
- Quantum Dots Synthesis And Properties
- Nanomaterials for catalytic reactions
- Gold and Silver Nanoparticles Synthesis and Applications
- Catalytic Processes in Materials Science
- Photonic and Optical Devices
- Physics of Superconductivity and Magnetism
- Underwater Acoustics Research
- Microwave Dielectric Ceramics Synthesis
University of California, Irvine
2017-2024
JDSU (United States)
2003
Enriching the functionality of ferroelectric materials with visible-light sensitivity and multiaxial switching capability would open up new opportunities for their applications in advanced information storage diverse signal manipulation functions. We report experimental observations robust intralayer ferroelectricity two-dimensional (2D) van der Waals layered α-In2Se3 ultrathin flakes at room temperature. Distinct from other 2D conventional ferroelectrics, In2Se3 exhibits intrinsically...
Abstract The enhanced compositional flexibility to incorporate multiple-principal cations in high entropy oxides (HEOs) offers the opportunity expand boundaries for accessible compositions and unconventional properties oxides. Attractive functionalities have been reported some bulk HEOs, which are attributed long-range homogeneity, lattice distortion, local chemical bonding characteristics materials. However, intricate details of composition fluctuation, metal-oxygen bond distortion...
Abstract Recent realizations of ultrathin freestanding perovskite oxides offer a unique platform to probe novel properties in two-dimensional oxides. Here, we observe giant flexoelectric response BiFeO 3 and SrTiO their bent state arising from strain gradients up 3.5 × 10 7 m −1 , suggesting promising approach for realizing ultra-large polarizations. Additionally, substantial change membrane thickness is discovered which implies an unusual bending-expansion/shrinkage effect the ferroelectric...
Abstract Magnetoelectric coupling at room temperature in multiferroic materials, such as BiFeO 3 , is one of the leading candidates to develop low-power spintronics and emerging memory technologies. Although extensive research activity has been devoted recently exploring physical properties, especially focusing on ferroelectricity antiferromagnetism chemically modified a concrete understanding magnetoelectric yet be fulfilled. We have discovered that La substitutions Bi-site lead progressive...
The chemical reaction of K 2 PtCl 4 reducing into Pt and the formation nanoparticles are captured in solid phase at atomic resolution.
Domain walls (DWs) in ferroelectrics are atomically sharp and can be created, erased, reconfigured within the same physical volume of ferroelectric matrix by external electric fields. They possess a myriad novel properties functionalities that absent bulk domains, thus could become an essential element next-generation nanodevices based on ferroelectrics. The knowledge about structure DWs not only advances fundamental understanding ferroelectrics, but also provides guidance for design...
Abstract Two-dimensional electron gas or hole (2DEG 2DHG) and their functionalities at artificial heterostructure interfaces have attracted extensive attention in recent years. Many theoretical calculations experimental studies shown the formation of alternating 2DEG 2DHG ferroelectric/insulator interfaces, such as BiFeO 3 /TbScO , depending on different polarization states. However, a direct observation based local charge distribution interface has yet to be explored. Herein we demonstrate...
Abstract Ferroelectric materials are characterized by the spontaneous polarization switchable applied fields, which can act as a “gate” to control various properties of ferroelectric/insulator interfaces. Here we review recent studies on modulation oxide hetero-/homo-interfaces ferroelectric polarization. We discuss potential applications recently developed four-dimensional scanning transmission electron microscopy and how it provide insights into fundamental understanding...
In recent years, La2Ti2O7 (LTO)-based piezoelectric materials, which belong to the perovskite-like layered structure (PLS) have become candidates in elevated temperature field due their high Curie temperature, resistivity, and gradually improved performance. our previous work (Li, Y.; Lee, T.; Jiang, L.; Wang, W.; Jiao, Z.; Liang, D.; Yan, X.; Xu, M.; Chen, Q.; Pan, Zhu, J. Improved Electrical Properties of Layer Structured La2Ti1.96V0.04O7 Ceramics. Electron. Mater. 2020, 49 (4),...
Dispersion management is critical for next-generation high-bandwidth-utilization fiber-optical networks. Square-top thin-film bandpass filters 50-GHz dense wavelength-division multiplexing inherently have high chromatic dispersion (CD) in transmission. The imparted power penalty on the network undesirable. However, a second filter, operating reflection, can be designed to compensate CD of filter. In this paper we demonstrate experimentally reduction intrinsic coupler from /spl plusmn/170...
In ferroelectric heterostructures, the interaction between intrinsic polarization and electric field generates a rich set of localized electrical properties. The local is determined by several connected factors, including charge distribution individual unit cells, interfacial electromechanical boundary conditions, chemical composition interfaces. However, especially in perovskites, complete description across micro-, nano-, atomic-length scales missing. Here, applying four-dimensional...
Abstract As a promising candidate for next‐generation nonvolatile memory devices, ferroelectric oxide films exhibit many emergent phenomena with functional applications, making understanding polarization switching and domain evolution behaviors of fundamental importance. However, tracking wall motion in high spatial resolution remains challenging. Here, an situ biasing approach direct atomic‐scale observations nucleation sideways is presented. By accurately controlling the applied electric...
Recent realizations of ultrathin freestanding perovskite oxides offer a unique platform to probe novel properties in two-dimensional oxides. Here, we observed giant flexoelectric response BiFeO3 and SrTiO3 their bent state arising from strain gradients up 4x10e7/m, suggesting promising approach for realizing extremely large polarizations. Additionally, substantial reversible change thickness was discovered BiFeO3, which implies an unusual bending-expansion/shrinkage thickness-dependence...
Manipulating thermal properties in materials has been of fundamental importance for advancing innovative technologies. Heat carriers such as phonons are impeded by breaking crystal symmetry or periodicity. Notable methods impeding the phonon propagation include varying density defects, interfaces, and nanostructures, well changing composition. However, a robust link between individual nanoscale defect structures, states, macroscopic conductivity is lacking. Here we reveal from...
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Journal Article Phase Coexistence in Multiferroic BiFeO3 Nano-needles Driven by Surface Boundary Conditions. Get access Francisco Guzman, Guzman Department of Materials Science and Engineering, University California, Irvine, CA, USA Search for other works this author on: Oxford Academic Google Scholar Christopher Addiego, Addiego Physics Astronomy, Moaz Waqar, Waqar Xiaoqing Pan USADepartment USAIrvine Research Institute, Corresponding author: xiaoqinp@uci.edu Microscopy Microanalysis,...