A5031205975- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic and transport properties of perovskites and related materials
- Nanocomposite Films for Food Packaging
- Anesthesia and Sedative Agents
- Nausea and vomiting management
- Anesthesia and Pain Management
- Endodontics and Root Canal Treatments
- Dielectric properties of ceramics
- Theoretical and Computational Physics
- Magnetic properties of thin films
- Dental Radiography and Imaging
- Anesthesia and Neurotoxicity Research
- Airway Management and Intubation Techniques
- Minerals Flotation and Separation Techniques
- Hyperglycemia and glycemic control in critically ill and hospitalized patients
- Topic Modeling
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Postharvest Quality and Shelf Life Management
- Microfluidic and Bio-sensing Technologies
- Cardiac and Coronary Surgery Techniques
- Salivary Gland Disorders and Functions
- Magnetic Properties of Alloys
Asan Medical Center
2025
University of Ulsan
2025
Kyung Hee University Hospital at Gangdong
2025
Shaanxi Normal University
2024
Korea Advanced Institute of Science and Technology
2001-2023
Kookmin University
2023
Advanced Institute of Convergence Technology
2023
Kootenay Association for Science & Technology
2023
Sungkyunkwan University
2018-2022
Kyung Hee University
2022
We report a photovoltaic effect in ferroelectric BiFeO3 thin films. The all-oxide heterostructures with SrRuO3 bottom and tin doped indium oxide top electrodes are characterized by open-circuit voltages ∼0.8–0.9 V external quantum efficiencies up to ∼10% when illuminated the appropriate light. Efficiencies at least an order of magnitude larger than maximum efficiency under sunlight (AM 1.5) thus far reported for ferroelectric-based devices. dependence measured voltage on film thickness...
A reversal of magnetization requiring only the application an electric field can lead to low-power spintronic devices by eliminating conventional magnetic switching methods. Here we show a nonvolatile, room temperature determined in ferromagnet-multiferroic system. The effect is reversible and mediated interfacial coupling dictated multiferroic. Such electric-field control magnetoelectric device demonstrates avenue for next-generation, low-energy consumption spintronics.
We present direct evidence for room-temperature magnetization reversal induced by an electric field in epitaxial ferroelectric BiFeO3-ferrimagnetic CoFe2O4 columnar nanostructures. Piezoelectric force microscopy and magnetic were used to locally image the coupled piezoelectric-magnetic switching. Quantitative analyses give a perpendicular magnetoelectric susceptibility of approximately 1.0 x 10(-2) G cm/V. The observed effect is due strong elastic coupling between two ferric constituents as...
The transport physics of domain wall conductivity in La-doped bismuth ferrite (BiFeO3) has been probed using variable temperature conducting atomic force microscopy and piezoresponse samples with arrays walls the as-grown state. Nanoscale current measurements are investigated as a function bias shown to be consistent distinct electronic properties at leading changes observed local conductivity. Our observation is well described within band picture conduction. Finally, we demonstrate an...
We report the formation of a novel ferromagnetic state in antiferromagnet ${\mathrm{BiFeO}}_{3}$ at interface with ferromagnet ${\mathrm{La}}_{0.7}{\mathrm{Sr}}_{0.3}{\mathrm{MnO}}_{3}$. Using x-ray magnetic circular dichroism Mn and Fe ${L}_{2,3}$ edges, we discovered that development this spin structure is strongly associated onset significant exchange bias. Our results demonstrate directly related to an electronic orbital reconstruction interface, which supported by linearly polarized...
The control of material interfaces at the atomic level has led to novel interfacial properties and functionalities. In particular, study polar discontinuities between complex oxides lies frontier modern condensed matter research. Here we employ a combination experimental measurements theoretical calculations demonstrate bulk property, namely ferroelectric polarization, heteroepitaxial bilayer by precise atomic-scale interface engineering. More specifically, is achieved exploiting valence...
We have grown epitaxial BiFeO3 thin films with smooth surfaces on (001), (101), and (111) SrTiO3 substrates using sputtering. Four-circle x-ray diffraction cross-sectional transmission electron microscopy show that the rhombohedral symmetry although small monoclinic distortions not been ruled out. Stripe ferroelectric domains oriented perpendicular to substrate miscut direction free of impurity phase are observed in high (4°) (001) SrTiO3, which attributes a relatively value remanent...
We have grown BiFeO3 thin films on SrRuO3∕SrTiO3 and SrRuO3∕SrTiO3∕Si using liquid delivery metalorganic chemical vapor deposition. Epitaxial were successfully prepared through the systematic control of reaction deposition process. found that film composition phase equilibrium are sensitive to Bi:Fe ratio in precursor. Fe-rich mixtures show existence α-Fe2O3, while Bi-rich presence β-Bi2O3 as a second at surface. In optimized films, we able obtain an epitaxial single perovskite film....
BiFeO3 simultaneously shows antiferromagnetic and ferroelectric order with high transition temperatures, i.e. T N ∼ 370°C C 830°C, respectively. Naturally, it has been inferred that coupling exists between the magnetic parameters like in multiferroic manganites low temperatures. A thorough investigation of properties is therefore line understanding its behaviour. Here, we review epitaxial (001) oriented films grown by different techniques on several substrates. Structural characterization...
In addition to synthesizing biofunctionalized magnetic nanopaticles for the purpose of magnetically labeling biomolecules, a system measure ac susceptibility labeled sample was developed. When targeted biomolecule mixed with fluid possessing nanoparticles, portions nanoparticles agglomerated form clusters due association biomolecule. Due formation clusters, measured reduced. The relationship between mixed-frequency reduction and amount detected established.
Propofol has been shown to provide protection against renal ischemia/reperfusion injury experimentally, but clinical evidence is lacking. Here we studied the effect of propofol anesthesia on occurrence acute kidney following heart surgery with cardiopulmonary bypass. One hundred and twelve patients who underwent valvular were randomized receive either or sevoflurane anesthesia, both sufentanil. Using Acute Kidney Injury Network criteria, significantly fewer developed postoperatively in group...
Objectives Asthma exacerbation, associated with many risks factors, can reflect management failure. However, little is known about how risk factors are according to asthma severity. We aimed investigate differences in patients different severity and evaluate whether differed between frequent exacerbators single exacerbation. Design Nationwide population-based observational study. Setting Korean National Sample Cohort database. Participants included 22 130 adults diagnoses more than twice...
The interplay between spin waves (magnons) and electronic structure in materials leads to the creation of additional bands associated with energy levels which are called magnon sidebands. large difference scales magnons (meV) (eV) makes this direct interaction weak hence sidebands difficult probe. Linear light absorption scattering techniques at low temperatures traditionally used probe these Here we show that optical second-harmonic generation, as lowest-order nonlinear process, can...
In this study, inulin (INU) extracted from burdock root was utilized as a new film base material and combined with chitosan (CHI) to prepare composite films. Oregano thyme essential oils (OT) were incorporated into the INU-CHI confer films bioactivities. The physical optical properties well antioxidant antimicrobial activities of evaluated. INU alone showed poor properties. contrast, compatibility CHI demonstrated by changes in attenuated total reflectance-Fourier transformation infrared...
Epitaxial growth of (0001)-oriented BiFeO3 thin films on the (0001) surface GaN has been realized using intervening epitaxial (111) SrTiO3∕(100) TiO2 buffer layers. The have two in-plane orientations: [112¯0]BiFeO3‖[112¯0]GaN plus a twin variant related by 180° rotation. shows an out-of-plane remanent polarization ∼90μC∕cm2, which is comparable to prepared SrTiO3 single crystal substrates. orientation provides maximal BiFeO3, equivalent charge 5×1014electrons∕cm2.