http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조재훈(Jaehun Cho) 한국세라믹학회 2023 세라미스트 Vol.26 No.2
This review article highlights the potential of flash sintering as a novel densification technology for advanced ceramics. Conventional ceramic sintering methods involve heating a powder compact at high temperatures for several hours to trigger the solid-state diffusion of atoms. In contrast, flash sintering takes advantage of electric field and current to drastically lower processing time and temperature, providing a promising solution to reduce the economic, energetic, and environmental costs associated with traditional ceramic sintering methods. The effects of electric field and current during flash sintering result in unique non-equilibrium microstructures that enhance the mechanical properties of advanced ceramics through defect-mediated inelastic deformation mechanisms. This article provides an overview of the flash sintering mechanisms, the unique microstructural features observed in flash-sintered ceramics, and their impacts on mechanical properties.
브릴루앙 광산란을 이용한 자성박막에서의 자화 동역학연구
조재훈(Jaehun Cho),김준서(June-Seo Kim),유천열(Chun-Yeol You) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.2
Brillouin light scattering (BLS) is used to measure thermally exited surface and bulk spinwave (SW) modes in various magnetic materials and it is to study SW frequency ranges up to sub-hundred GHz. In this review, we discuss magnetic properties on magnetic thin films including Heisenberg interaction, in-plane biaxial magnetic anisotropy, perpendicular magnetic anisotropy, Dzyaloshinskii-Moriya interaction probed by using a BLS spectroscopy.
두께변화에 대한 Ni<SUB>81</SUB>Fe<SUB>19</SUB> 박막의 자화 동역학 특성연구
조재훈(Jaehun Cho),김준서(June-Seo Kim),유천열(Chun-Yeol You) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
The thickness dependent magnetic properties of Ni<SUB>81</SUB>Fe<SUB>19</SUB> thin film are investigated using Brillouin light scattering and Vector network analyzer-ferromagnetic resonance. Ni<SUB>81</SUB>Fe<SUB>19</SUB> thin films are fabricated by DC magnetron sputtering system as 15, 30, 50, 70 nm. The determined magnetic parameters are saturation magnetization (M<SUB>s</SUB>), exchange stiffness constant (A<SUB>ex</SUB>), and Gilbert damping constant (α). M<SUB>s</SUB> values are slightly increased as increasing Ni<SUB>81</SUB>Fe<SUB>19</SUB> thickness and decreased as increasing Ni<SUB>81</SUB>Fe<SUB>19</SUB> thickness. A<SUB>ex</SUB> values are almost identical value as 8.9 pJ/m, and α is decreased from 0.0113 ± 0.0001 to 0.0086 ± 0.0002 as increasing Ni<SUB>81</SUB>Fe<SUB>19</SUB> thickness.
김준서(June-Seo Kim),조재훈(Jaehun Cho) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
Multiple chiral magnetic domain walls (DW) motions on a perpendicularly magnetized nanowire by applying transverse magnetic field pulses are systematically investigated. The chiral DW motions depend on the directions of the magnetic fields, the magnetic domain wall configurations, and the signs of the Dzyaloshinskii-Moriya (DMI) interaction. For racetrack memory, the successive chiral DW motions by introducing the repetitive magnetic field pulses for both directions are numerically demonstrated. Lastly, various applications such as the next-generation non-volatile memory devices and the artificial intelligent logic devices based on the chiral DW motions are discussed.