A5066313637- Ferroelectric and Piezoelectric Materials
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Multiferroics and related materials
- Machine Learning in Materials Science
- Acoustic Wave Resonator Technologies
- Neural Networks and Applications
- Advanced MEMS and NEMS Technologies
- Advanced Sensor and Energy Harvesting Materials
- Electron and X-Ray Spectroscopy Techniques
- Advanced Materials Characterization Techniques
- Spacecraft and Cryogenic Technologies
- Engineering Applied Research
- Machine Fault Diagnosis Techniques
- Industrial Technology and Control Systems
- Computational Physics and Python Applications
- Advanced Electron Microscopy Techniques and Applications
- Image Processing and 3D Reconstruction
- Microwave Dielectric Ceramics Synthesis
- Conducting polymers and applications
- Advancements in Battery Materials
- Advanced Battery Technologies Research
- Model Reduction and Neural Networks
- Ferroelectric and Negative Capacitance Devices
- Scientific Computing and Data Management
Drexel University
2022-2025
University of the Philippines System
2024
Lehigh University
2018-2023
University of California, Berkeley
2015-2021
Berkeley College
2019
Lawrence Berkeley National Laboratory
2018
University of Illinois Urbana-Champaign
2012-2015
Georgia Institute of Technology
2010-2012
University of Manchester
1996
Ferroelectrics, with their spontaneous switchable electric polarization and strong coupling between electrical, mechanical, thermal, optical responses, provide functionalities crucial for a diverse range of applications.Over the past decade, there has been significant progress in epitaxial strain engineering oxide ferroelectric thin films to control enhance nature order, alter susceptibilities, create new modes response which can be harnessed various applications.This review aims cover some...
Optimizing synthesis parameters is crucial in fabricating an ideal cathode material; however, the design space too vast to be fully explored using Edisonian approach. Here, by clustering eleven domain-expert-derived-descriptors from literature, we use inverse surrogate model build up experimental parameters-property relationship. Without struggling with trial-and-error method, enables variables prediction that serves as effective strategy for retrosynthesis. More importantly, not only did...
Abstract Machine learning (ML) has become critical for post-acquisition data analysis in (scanning) transmission electron microscopy, (S)TEM, imaging and spectroscopy. An emerging trend is the transition to real-time closed-loop microscope operation. The effective use of ML microscopy now requires development strategies microscopy-centric experiment workflow design optimization. Here, we discuss associated challenges with active ML, including sequential out-of-distribution drift effects,...
Leveraging competition between energetically degenerate states to achieve large field-driven responses is a hallmark of functional materials, but routes such are limited. Here, new route effects involving domain-structure demonstrated, which arises from strain-induced spontaneous partitioning PbTiO3 thin films into nearly degenerate, hierarchical domain architectures coexisting c/a and a1 /a2 structures. Using band-excitation piezoresponse force microscopy, this study manipulates...
Synthesis of compositionally graded versions PbZr1-xTixO3 thin films results in unprecedented strains (as large as ≈4.5 × 105 m−1) and correspondingly unexpected crystal structures, ferroelectric domain properties. This includes the observation built-in electric fields 200 kV/cm. Compositional strain gradients could represent a new direction strain-control materials. As service to our authors readers, this journal provides supporting information supplied by authors. Such materials are peer...
Abstract A range of modern applications require large and tunable dielectric, piezoelectric or pyroelectric response ferroelectrics. Such effects are intimately connected to the nature polarization how it responds externally applied stimuli. Ferroelectric susceptibilities are, in general, strongly temperature dependent, diminishing rapidly as one transitions away from ferroelectric phase transition ( T C ). In turn, researchers seek new routes manipulate simultaneously enhance broaden...
Multiscale and multimodal imaging of material structures properties provides solid ground on which materials theory design can flourish. Recently, KAIST announced 10 flagship research fields, include Materials Revolution: Molecular Modeling, Imaging, Informatics Integration (M3I3). The M3I3 initiative aims to reduce the time for discovery, development based elucidating multiscale processing–structure–property relationship hierarchy, are be quantified understood through a combination machine...
We investigate the origin of large built-in electric fields that have been reported in compositionally graded ferroelectric thin films using PbZr${}_{1\ensuremath{-}x}$Ti${}_{x}$O${}_{3}$ ($0.2<x<0.8$) as a model system. show cause voltage offset hysteresis loops are dependent on strain relaxation (through misfit dislocation formation) and accompanying polarization distribution within material. Using Ginzburg-Landau-Devonshire phenomenological formalism includes effects compositional...
Electric-field switching of polarization is the building block a wide variety ferroelectric devices. In turn, understanding factors affecting and developing routes to control it are great technological significance. This work provides systematic experimental evidence role defects in ferroelectric-polarization utilizes ability deterministically create spatially locate point $\mathrm{PbZ}{\mathrm{r}}_{0.2}\mathrm{T}{\mathrm{i}}_{0.8}{\mathrm{O}}_{3}$ thin films via focused-helium-ion...
Temperature- and electric-field-induced structural transitions in a polydomain ferroelectric can have profound effects on its electrothermal susceptibilities. Here, the role of such ferroelastic domains pyroelectric electrocaloric response is experimentally investigated thin films tetragonal PbZr0.2 Ti0.8 O3 . By utilizing epitaxial strain, rich set states spanning broad thermodynamic phase space are stabilized. Using temperature-dependent scanning-probe microscopy, X-ray diffraction,...
Abstract The ability to manipulate domains underpins function in applications of ferroelectrics. While there have been demonstrations controlled nanoscale manipulation domain structures drive emergent properties, such approaches lack an internal feedback loop required for automatic manipulation. Here, using a deep sequence-to-sequence autoencoder we automate the extraction latent features ferroelectric switching from piezoresponse force spectroscopy tensile-strained PbZr 0.2 Ti 0.8 O 3 with...
We have investigated the contribution of 90\ifmmode^\circ\else\textdegree\fi{} domain walls and thermal expansion mismatch to pyroelectricity in ${\mathrm{PbZr}}_{0.2}{\mathrm{Ti}}_{0.8}{\mathrm{O}}_{3}$ thin films. The first phenomenological models include extrinsic secondary contributions polydomain films predict significant (arising from temperature-dependent motion walls) large between film substrate). Phase-sensitive pyroelectric current measurements are applied model for time reveal a...
Epitaxial strain has been widely used to tune crystal and domain structures in ferroelectric thin films. New avenues of engineering based on varying the composition at nanometer scale have shown generate symmetry breaking large gradients culminating built-in potentials. In this work, we develop routes deterministically control these potentials by exploiting interplay between gradients, accommodation, formation compositionally graded PbZr1–xTixO3 heterostructures. We demonstrate that...
Abstract In alignment with the Materials Genome Initiative and as product of a workshop sponsored by US National Science Foundation, we define vision for materials laboratories future in alloys, amorphous materials, composite materials; chart roadmap realizing this vision; identify technical bottlenecks barriers to access; propose pathways equitable democratic access integrated toolsets manner that addresses urgent societal needs, accelerates technological innovation, enhances manufacturing...
On 17 November 2024, Super Typhoon Man-yi (local name: Pepito) hit the northern part of Philippines with maximum sustained winds 195 km/h and lowest central pressure 920 hPa. was third typhoon to make landfall in for that month. first passed through island province Catanduanes before proceeding north making at Dipaculao Aurora province. High-risk storm surge warnings were issued country an estimated height 2.1 3.0 meters coast a 48-hour lead time forecast. Although extensive documentation on...
<title>Abstract</title> Precise cell classification is essential in biomedical diagnostics and therapeutic monitoring, particularly for identifying diverse types involved various diseases. Traditional methods such as flow cytometry depend on molecular labeling which often costly, time-intensive, can alter integrity. To overcome these limitations, we present a label-free machine learning framework classification, designed real-time sorting applications using bright-field microscopy images....
Pulsed-laser deposition (PLD) is a powerful technique for growing complex oxides with controlled stoichiometry. To understand growth dynamics therein, it common to leverage in situ spectroscopies, such as reflection high-energy electron diffraction (RHEED), monitor surface crystallinity. Most commercial systems rely on video-rate cameras operating at 60-120 Hz that lack sufficient temporal resolution capture practical frequencies. Here, high-speed platform record via RHEED >500 implemented....
Despite extensive studies on the effects of epitaxial strain evolution lattice and properties materials, considerably less work has explored impact growth dynamics. In this work, we demonstrate a growth-mode transition from 2D-step flow to self-organized, nanoscale 3D-island formation in PbZr0.2Ti0.8O3/SrRuO3/SrTiO3 (001) heterostructures as kinetics process respond strain. With increasing heterostructure thickness misfit dislocation at buried interface, periodic, modulated field is...
Abstract Many energy conversion, sensing, and microelectronic applications based on ferroic materials are determined by the domain structure evolution under applied stimuli. New hyperspectral, multidimensional spectroscopic techniques now probe dynamic responses at relevant length time scales to provide an understanding of how these nanoscale structures impact macroscopic properties. Such approaches, however, remain limited in use because difficulties that exist extracting visualizing...
Ferroelectric materials provide a useful model system to explore the jerky, highly nonlinear dynamics of elastic interfaces in disordered media. The distribution nanoscale switching event sizes is studied two $\mathrm{Pb}({\mathrm{Zr}}_{0.2}{\mathrm{Ti}}_{0.8}){\mathrm{O}}_{3}$ thin films with different disorder landscapes using piezoresponse force microscopy. While statistics show expected power-law scaling, significant variations value scaling exponent $\ensuremath{\tau}$ are seen,...
Ferroelectrics, due to their polar nature and reversible switching, can be used dynamically control surface chemistry for catalysis, chemical other applications such as water splitting. However, this is a complex phenomenon where ferroelectric domain orientation switching are intimately linked charges. In work, the temperature-induced behavior of ferroelectric-ferroelastic domains in free-standing BaTiO3 films under different gas environments, including vacuum oxygen-rich, studied by situ...