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- 저자 : 정명화(M.H.Jung) (검색결과 10 건)
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Co/Ni 다층박막의 수직자기이방성 발현에 대한 하지층의 영향
이기승(K.-S. Lee),이경진(K. J. Lee),정명화(M. H. Jung),신경호(K. Shin) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.3
We investigated how the magnetic anisotropy in [Co(2 A)/Ni(8 A)]×N multilayers varied with the type and thickness of an underlayer. The magnetic measurements clearly showed that the perpendicular magnetic anisotropy could be developed in the Co/Ni multilayer by adopting an underlayer with [111] texture. The coercivity of the Co/Ni multilayer increased from 99 Oe to 430 Oe as the thickness of an Au underlayer increased from 50 A to 500 A. The increase in coercivity is ascribed to the development of the stronger [111] texture in the Co/Ni multilayer as an Au underlayer gets thicker.
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희토류 monoantimonides에서의 특이한 적외흡수의 온도 의존성
정명화,조은상,권용성 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.1
The optical reflectivity spectra were measured on the single crystals LaSb, PrSb, GdSb and DySb at several temperatures. In the spectra of these materials excepting LaSb, the dip due to an anomalous absorption was found at about 0.25eV. The number of the effective electron N_LA taking part in the absorption was evaluated from quantitative analysis. The inverse of N_LA is linear to temperature and the N_LA at each temperature is dependent on square of the effective Bohr magnetron of each rare-earth ion. Therefore, this absorption seems to be due to the scattering between the spin of carriers and the localized magnetic moments at each site of rare-earth ion.
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희토류 monoantimonides에서 캐리어들과의 적외흡수 correlation
정명화,이경렬,조은상,권용성 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.1
The optical conductivity spectra were obtained in the single crystals LaSb, PrSb, GdSb and DySb at several temperatures. In these materials excepting LaSb, the spectra show Drude's behaviors with the hump due to an anomalous absorption lied at about 0.25eV. For quantitative analysis, we decomposed the spectrum into two parts; the free-electron absorption and the infrared absorption. The sum of the number of the effective electrons due to the Drude absorption and that due to the infrared absorption well agrees with the number of carriers obtained from their band calculations or their dHvAs. Thus, it is concluded that the infrared absorption is due to the transition of carriers.
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정명화,조은상,권용성 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.1
Two anomalies in electrical resistivity of CeTe_2 have already been found at around 5.6 and 65K. To make the origin of anomalies clear, magnetoresistivity, electrical resistivity, and Hall coefficient in CeTe_2 are measured. The carrier concentration as well as the mobilites of electrons and holes are calculated by the measurements. From these results, the former seems to be due to the competition between magnetic ordering and magnetic polaron. On the other hand, the latter is suggested to be due to p-f mixing effect. The carrier concentration of CeTe_2 as a extremely low carrier system is estimated to be about 10^20/∼10^21/㎥.
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희토류 3원계 화합물인 LaPtSb와 CePtSb의 전자구조
김기회,정명화,권용성 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.1
The optical conductivity spectra were obtained in the single crystal with ab-plane and ac-plane of CePtSb and polycrystals of CePtSb and LaPtSb. The carrier concentrations in ac-plane and ab-plane were estimated to be 0.042 and 0.182 per molecule from intraband transition, respectively, which is consistent with the result of electrical resistivity. From analysis of interband transitions, the 4d state of Pt-ion in ac-plane ties in about 1.1eV lower energy than that in ab-plane while the 4f state of Ce-ion does about 2.8eV higher. The energy shift of these band causes the anisotropy of carrier concentration.
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고농도 Kondo 계인 Ce_0.8Ta_0.2Te_2의 전자기적 특성에 관한 연구
조은상,조정현,박상천,신용숙,정명화,권용성 성균관대학교 기초과학연구소 1997 論文集 Vol.48 No.-
The Ce_0.8Ta_0.2Te_2 single crystal was grown by using pre-reaction and mineralization method. From X-ray diffraction experiments, We can know that the Ce_0.8Ta_0.2Te_2 has tetragonal structure with being a=4.653Å and c= 9.305Å. We processed electric, magnetic and thermal experiments. In Electric resistivity, one of main peaks is sharp-shape peak at 6K, the other is broad-shape peak near 150K. The origin of 6K peak is guessed magnetic transition. This idea is confirmed by measurement of electric resistivity in various magnetic field. Specific heat measurement was done by using an adiabatic method in 1.8K-120K region. A sharp-shape peak was detected at 4.4K. We guess the origin of the sharp peak is due to a magnetic transition. The peak temperature is matched to temperature of measurement of magnetization. Magnetic susceptibility was translated on effective Bohr magneton (μ_eff) Curie-Weiss law. The value of μ_eff (=2.42_μB) give information of which Ce is composed on 3+ ion to us. (experimental value Ce μ_eff = 2.4_μB).
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Optical properties of LaTe_2 and CeTe_2
Jung, M.H.,Cho, E.S.,Kwon, Y.S. 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.1
Reflectivity spectra for the single crystals of LaTe_2 and CeTe_2 are measured in the photon energy range from 2meV to 10.78eV at several temperatures, Optical conductivity spectra are obtained by the Kramers-Kronig transformation of the reflectivity spectra. The majority of the structures in these spectra are assigned to originate from the optical interband transition from the valence p-band to the conduction 5d-bands. The 5d band is expected to split into several bands through the strong crystal field. The two peaks situated at about 2eV and 5.8eV in CeTe_2 are assigned to be due to the transition from the occupied 4f-state to the 5d-bands. The 4f level is thought to be about 1eV below the Fermi level.
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