A5028688068- 2D Materials and Applications
- Magnetic properties of thin films
- ZnO doping and properties
- Semiconductor materials and interfaces
- Nanowire Synthesis and Applications
- Graphene research and applications
- Quantum and electron transport phenomena
- Image and Signal Denoising Methods
- Semiconductor materials and devices
- Advanced Memory and Neural Computing
- Topological Materials and Phenomena
- GaN-based semiconductor devices and materials
- Advancements in Semiconductor Devices and Circuit Design
- Ferroelectric and Negative Capacitance Devices
- Heusler alloys: electronic and magnetic properties
- Magnetic and transport properties of perovskites and related materials
- Image Processing Techniques and Applications
- Silicon Nanostructures and Photoluminescence
- Advanced ceramic materials synthesis
- Ga2O3 and related materials
- MXene and MAX Phase Materials
- Metal and Thin Film Mechanics
- Chalcogenide Semiconductor Thin Films
- Digital Filter Design and Implementation
- Titanium Alloys Microstructure and Properties
Korea Institute of Science and Technology
2016-2025
Pusan National University
2022
Sungkyunkwan University
2019-2021
ON Semiconductor (South Korea)
2016-2020
Jeonnam Bioindustry Foundation
2015
Chosun University
2013-2014
Yonsei University
2007-2013
Pohang University of Science and Technology
2007-2009
Jeonbuk National University
2007-2009
Layered transition metal dichalcogenides (TMDs) draw much attention as the key semiconducting material for two-dimensional electrical, optoelectronic, and spintronic devices. For most of these applications, both n- p-type materials are needed to form junctions support bipolar carrier conduction. However, typically only one type doping is stable a particular TMD. example, molybdenum disulfide (MoS2) natively an n-type presumably due omnipresent electron-donating sulfur vacancies,...
The field of magnetic skyrmions has been actively investigated across a wide range topics during the last decades. In this topical review, we mainly review and discuss key results findings in skyrmion research since first experimental observation 2009. We particularly focus on theoretical, computational advances that are directly relevant to spintronic applications based skyrmions, i.e. their writing, deleting, reading processing driven by field, electric current thermal energy. then several...
Abstract Doping of traditional semiconductors has enabled technological applications in modern electronics by tailoring their chemical, optical and electronic properties. However, substitutional doping two-dimensional is at a comparatively early stage, the resultant effects are less explored. In this work, we report unusual degenerate with Nb on structural, characteristics MoS 2 crystals. The readily induces structural transformation from naturally occurring 2H stacking to 3R stacking....
Since the discovery of ferromagnetic two-dimensional (2D) van der Waals (vdW) crystals, significant interest on such 2D magnets has emerged, inspired by their appealing properties and integration with other family for unique heterostructures. In known magnets, spin-orbit coupling (SOC) stabilizes perpendicular magnetic anisotropy (PMA). Such a strong SOC could also lift chiral degeneracy, leading to formation topological textures as skyrmions through Dzyaloshinskii-Moriya interaction (DMI)....
Ni-Fe-based materials are well known as one of the most active electrocatalysts for oxygen evolution reaction (OER) in alkaline environments. In this study, we propose a facile and scaling up synthesis route using surfactant Ni-Fe 2D nanostructured electrocatalysts. Furthermore, uncovered hidden phase transformation mechanism layered double hydroxide (LDH) by combining various situ operando analyses. The LDH underwent chemically induced an environment without applied potential. resulting...
Abstract 2D layered materials with sensitive surfaces are promising for use in chemical sensing devices, owing to their extremely large surface‐to‐volume ratios. However, most sensors based on used the form of laterally defined active channels, which area is limited actual device dimensions. Therefore, a novel approach fabricating self‐formed active‐channel devices proposed semiconductor very surface areas, and potential gas ability examined. First, vertical growth phenomenon SnS 2...
Abstract The advent of ferromagnetism in 2D van der Waals (vdW) magnets has stimulated high interest exploring topological magnetic textures, such as skyrmions for use future skyrmion‐based spintronic devices. To engineer vdW by transforming Bloch‐type bubbles into Néel‐type skyrmions, a heavy metal/vdW thin film heterostructure been made to induce interfacial Dzyaloshinskii–Moriya interaction (DMI). However, the unambiguous identification textures inherent magnets, example, whether twists...
Abstract Microscopic structures and magnetic properties are investigated for Fe 5− x GeTe 2 single crystal, recently discovered as a promising van der Waals (vdW) ferromagnet. An atom (Fe(1)) located in the outermost 5 Ge sublayer has two possible split‐sites which either above or below atom. Scanning tunneling microscopy shows √3 × superstructures attributed to ordering of Fe(1) layer. The have different phases due symmetry ordering. Intriguingly, observed breaks inversion resulting...
We report magnetism in Cu doped single-crystalline GaN nanowires. The typical diameter and the length of Ga1-xCuxN nanowires (x = 0.01, 0.024) are 10-100 nm tens micrometers, respectively. saturation magnetic moments measured to be higher than 0.86 microB/Cu at 300 K, Curie temperatures far above room temperature. Anomalous X-ray scattering diffraction measurement make it clear that atoms substitute Ga sites, they largely take part wurtzite network host GaN. absorption circular dichroism...
Fairness is becoming an increasingly crucial issue for computer vision, especially in the human-related decision systems. However, achieving algorithmic fairness, which makes a model produce indiscriminative outcomes against protected groups, still unresolved problem. In this paper, we devise systematic approach reduces biases via feature distillation visual recognition tasks, dubbed as MMD-based Fair Distillation (MFD). While technique has been widely used general to improve prediction...
Abstract Efficient magnetization control is a central issue in magnetism and spintronics. Particularly, there are increasing demands for manipulation of magnetic states van der Waals (vdW) magnets with unconventional functionalities. However, the electrically induced phase transition between ferromagnetic‐to‐antiferromagnetic without external field yet to be demonstrated. Here, current‐induced vdW ferromagnet Fe 5 GeTe 2 reported. Based on magneto‐transport measurements theoretical analysis,...
Semiconductor spintronics is an alternative to conventional electronics that offers devices with high performance, low power and multiple functionality. Although a large number of mesoscopic dimensions have been successfully demonstrated at temperatures for decades, room-temperature operation still needs go further. Here we study spin injection in single-crystal gallium nitride nanowires report robust accumulation room temperature enhanced polarization 9%. A Overhauser coupling between the...
When Ni is doped in Fe 3 GaTe 2 , the coercivity significantly increases even at room temperature, which due to domain pinning effect.
We report on synthesis of Mn-doped Ge nanowires and their magnetic electrical properties. The were grown the silicon substrate by vapor−liquid−solid mechanism using Au as catalyst GeCl4 MnCl2 precursor. Anomalous X-ray scattering measurement makes it clear that Mn atoms are substitutionally incorporated with diamond network host sites. Superconducting quantum interference device characterization indicated possess ferromagnetism up to room temperature. circular dichroism spectra at L2,3-edges...
We report on temperature-dependent charge and magneto transport of chemically doped MoS2, p-type molybdenum disulfide degenerately with niobium (MoS2:Nb). The temperature dependence the electrical resistivity is characterized by a power law, ρ(T) ∼ T−0.25, which indicates that system resides within critical regime metal-insulator (M-I) transition. By applying high magnetic field (∼7 T), we observed 20% increase in at 2 K. positive magnetoresistance shows this governed Mott-like...
Interface engineering is an effective approach to tune the magnetic properties of van der Waals (vdW) magnets and their heterostructures. The prerequisites for practical utilization vdW heterostructures are a quantitative analysis anisotropy ability modulate interfacial properties, which have been challenging achieve with conventional methods. Here we characterize Fe3GeTe2 layers by employing magnetometric technique based on anomalous Hall measurements confirm its intrinsic nature. In...
Glucose in biological cells is metabolized and exists as glucose-6-phosphate (G6P). A G6P biosensor was fabricated using a combination of phage display autodisplay technologies for the detection G6P. Active dehydrogenase (G6PDH) expressed anchored to outer membrane Escherichia coli (E. coli) technology. Autodisplayed G6PDH exhibited high activity confirmed by OM protein analysis. conductive nanomesh layer formed enhance direct electron transfer enzyme. autodisplaying E. were then immobilized...
The phase diagram and M – H curves of the metamagnetic regime (Fe 1− x Co ) 3 GaTe 2 with = 0.19–0.26 at various temperatures were studied.