A5004705112- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Gas Sensing Nanomaterials and Sensors
- Advanced Condensed Matter Physics
- ZnO doping and properties
- Multiferroics and related materials
- Magnetic Properties of Alloys
- Metallic Glasses and Amorphous Alloys
- Magnetic Properties and Applications
- Perovskite Materials and Applications
- Transition Metal Oxide Nanomaterials
- Semiconductor materials and devices
- Luminescence Properties of Advanced Materials
- Quantum Dots Synthesis And Properties
- Catalysis and Oxidation Reactions
- Solid-state spectroscopy and crystallography
- Nuclear materials and radiation effects
- Catalytic Processes in Materials Science
- Surface Roughness and Optical Measurements
- Ga2O3 and related materials
- Magnetic Properties and Synthesis of Ferrites
- Ferroelectric and Piezoelectric Materials
Pusan National University
2016-2024
Seoul National University
2020
Institute for Basic Science
2020
Daegu Gyeongbuk Institute of Science and Technology
2020
University of Wisconsin–Madison
2013
Ferrimagnetic ${\mathrm{SrFe}}_{12}{\mathrm{O}}_{19}$ (SrM) is a mother phase for ferrite permanent magnets, which are commonly used due to its low cost compared that of Nd-based magnets and broader uses in magnet markets. Recently, electronic ground state has been debated. It proposed the SrM quantum paraelectric single-crystal form, while polycrystalline ferroelectric state. In this work, strain can stabilize ferroelectricity at room temperature, keeping ferrimagnetism. The strained shows...
Two-dimensional electron gas (2DEG) formed at the interface between two oxide band-insulators LaAlO3 and SrTiO3 raises possibility to develop nanoelectronics. Here, we report creation of a 2DEG LaAlO3/SrTiO3 heterointerfaces grown by 90° off-axis sputtering which allows uniform films over large area. The electrical transport properties heterointerface are similar those pulsed laser deposition. We also demonstrate room-temperature conductive probe-based switching quasi-one-dimensional...
Within industrial and military contexts, research on infrared transparent conductors (IR-TCs) has been limited due to the significant suppression of transparency by free electron response. In this paper, we report that strong correlations between electrons play an important role in development a new strategy for fabricating IR-TCs. Metallic VO2(B) V6O13 persistently exhibit transmittances 45% higher than Sn-doped In2O3 broad IR wavelength range up 8 μm. Based electronic band structures...
The functional perovskite La1-x Sr x MnO3 (LSMO) possesses various exotic phases owing to competing physical parameters and internal degrees of freedom. In particular, the nature ferromagnetic insulating phase (FMI) has not been adequately explored, resulting in a limited understanding relationship between crystal structure magnetism. To investigate this structure-property relationship, epitaxial La0.88Sr0.12MnO3 thin films were grown on two different substrates, (001) SrTiO3...
Lead-free double perovskite halides are emerging optoelectronic materials that alternatives to lead-based halides. Recently, single-crystalline were synthesized, and their intriguing functional properties demonstrated. Despite such pioneering works, lead-free with better crystallinity still in demand for applications novel devices. Here, we realized highly crystalline Cs2AgBiBr6 single crystals a well-defined atomic ordering on the microscopic scale. We avoided formation of Ag vacancies...
Materials having an anisotropic crystal structure often exhibit anisotropy in the electrical conductivity. Compared to complex transition-metal oxides (TMOs), simple TMOs rarely show large conductivity due their structure. Here, we focus on of a TMO, oxygen-deficient tungsten oxide (WOx) with We fabricated several WOx films by pulsed laser deposition technique lattice-matched (110)-oriented LaAlO3 substrate under controlled oxygen atmosphere. The crystallographic analyses revealed that...
Nd1-xSrxMnO3 is a well-known manganite due to close connection among structure, transport, magnetism, and chemistry. Thus, it would be an ideal system study the modification of physical properties by external stimuli including control stoichiometry in growth. In this work, we show that abrupt change electronic magnetic can achieved subtle oxygen partial pressure pulsed laser deposition. Interestingly, indeed modulates cation stoichiometry. We clearly observed films grown at 140 mTorr higher...
Oxygen stoichiometry is a critical factor in transition-metal oxides, such as manganites, it has substantial influence on their electronic and magnetic properties through the generation of oxygen vacancies. However, significance often underestimated manganite thin films. In this study, we explore formation vacancies within La0.88Sr0.12MnO3 (LSMO) under standard thin-film deposition conditions elucidate how these can be effectively filled exposure to high partial pressure (PO2) order several...
First Page
희토류와 전이금속 합금은 희토류의 높은 자기 이방성과 전이금속이 가지는 포화자화의 결합으로 뛰어난 자기적 특성을 지닐 수 있다고 알려져 있다. 특히 ThMnSUB12/SUB 구조를 희토류 구조적으로 이방성이 커질 있어 향상시킬 있고 함량 또한 상용중인 영구자석보다 낮아 많은 기대를 받는 물질이다. 여러 면에서 물질이지만 준안정상이라는 가지고 있기 때문에 안정화에 어려움이 본 연구에서는 GdFeSUB12/SUB를 박막 형태로 제작하여 상안정화를 시도하였으며 증착 온도에 따른 물성을 분석했다. 박막은 500 ℃에서 200 ℃ 사이에서 에피텍셜 성장했다. XRD 측정을 통해 얻은 결과로부터 (330) GdFeSUB12/SUB 박막이 성장된 것을 확인했다. 진동시료형자력계 증착온도(TSUBg/SUB) 400 포화자화 = 1130 emu/㎤와, 보자력 712 Oe을 가짐을