http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
광전자회절을 이용한 Ni(111)(2×2)-O/CO의 표면 흡착 구조: 시편준비의 온도 의존성
강지훈(J.-H. Kang) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.1
A study fo the adsorption site of CO in the N(111)/p(2×2)-O/CO coadsorbed phase over different sample preparation temperatures revealed that the atop site is favoured. The Ni-C spacing is given by 1.77±0.01 Å. A study of the adsorption site of CO in the Ni (111)/ p(2×2)-O/CO coadsorbed phase over different sample preparation temperatures revealed that the atop site is favoured. The Ni-C spacing is given by 1.77±0.01 Å. The data from the sample prepared at 265 K showed atop sites, which is well consistent with vibrational spectroscopy, whilst the data from the low temperature preparation appears the mixture of atop and hcp (35%). The occupation of hcp hollow sites is probably due to an incorrect pre-coverage of atomic oxygen (different from 0.25 ㎖). Similar observation of site mixture also found in recent high resolution XPS measurements using C 1s and O 1s chemical shifts.
축약 각운동량 전개(Reduced Angular Momentum Expansion) 방법으로 해석한 전자 산란의 각 운동량 효과
강지훈(J.-H. Kang) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.1
We calculate the electron scattering amplitude with reduced angular momentum expansion (RAME) and compare it with the plane wave approximation. By using WKB approximation it is shown that the curvature correction factor given by RAME is originated from the source wave centrifugal potential energy. The factor also can be understood as an effective wave number correction factor in plane wave approximation. Angular momentum and its relationship with scattering amplitude is explicitly shown.
전이금속을 치환한 란탄망간산화물계 La0.5Ca0.5(Mn0.98TM0.02)O₃(TM = Cr, Ti)의 자성 특성 연구
강지훈(J.-H. Kang),전수진(S. J. Jun),박정수(J. S. Park),이영백(Y. P. Lee),이연승(Y. S. Lee) 한국자기학회 2007 韓國磁氣學會誌 Vol.17 No.1
고상 반응법을 써서 전이금속 (Cr, Ti)을 치환한 란탄칼슘망간산화물, La0.5Ca0.5(Mn0.98TM0.02)O₃의 자성특성을 연구하였다. 자성 특성은 VSM을 써서 측정하였고, 50 Oe에서 zero field cooling과 field cooling을 하면서, 자화-온도측정을 Cr과 Ti 치환한 경우에 측정하였다. La0.5Ca0.5(Mn0.98Cr0.02)O₃는 클러스터 또는 스핀유리와 유사한 거동을 보였으며, La0.5Ca0.5(Mn0.98Ti0.02)O₃에서는 관찰되지 않았다. 큐리온도는 전이금속이 치환된 시편의 경우 란탄칼슘망간산화물 La0.5Ca0.5MnO₃의 큐리온도 245.5 K에서 감소한, 235.5 K [La0.5Ca0.5(Mn0.98Cr0.02)O₃], 232.7 K [La0.5Ca0.5(Mn0.98Ti0.02)O₃]로 모두 감소하였다. 자벽 고정 (domain wall pinning)을 알아보기 위해 온도에 따른 보자력 측정을 하였고, 이 결과를 defect와 자벽 간의 상호작용의 관점으로 해석하였다. Magnetic properties of transition metal doped La0.5Ca0.5Mn0.98TM0.02O₃ (TM = Cr and Ti) are studied. The samples are synthesized by the conventional solid-state method. Using vibrating sample magnetometer magnetization-temperature measurement were carried out with zero field cooling and field cooling at 50 Oe. Cr-doped sample shows cluster or spin glass like behavior while Ti doped does not. Curie temperature obtained were decreased from that of LCMO (245.5 K). Curie temperatures of Cr-doped and Ti-doped samples are 235.5 K and 232.7 K, respectively. The temperature-dependent coercivity Hc(T) was also measured. The coercive force continuously decreases with the substitution of Cr and Ti, The result can be understood in terms of the interaction between defect and domain wall.
Quantitative Structure Determinations of Glycine/Cu(100) and Cu(110)
강지훈(J.-H. Kang) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.1
The first quantitative structure determination has been obtained for Cu(100)/glycine (NH₂CH₃COOH). The molecule is adsorbed on the surface via two functional groups: the nitrogen of the amino group and one or both two oxygen atoms of the carboxylate group are bonded in near atop site. The Cu-N is tilted 5˚±4˚, away from the surface normal whilst the Cu-O is tilted by 9˚±2˚. The chemical bonding lengths are determined with 2.05±0.02 Å for both Cu-N and Cu-O. This bonding geometry is similar to that of glycine on Cu(110). A reanalysis of O 1s from the Cu(110)(2×3)pg-glycine show two oxygen atoms are inequivalent, with one being offset 0.29 Å more than the other.