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RISS 인기검색어
- 검색키워드
- 저자 : Jooyull Rhee (검색결과 4 건)
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Optical Anisotropy of Non-Cubic Crystal
JooYull Rhee 호서대학교 기초과학연구소 1997 기초과학연구 논문집 Vol.5 No.1
Analytic formulae for finding the components the complex dielectric tensor of non-cubic crystals are derived Although the method can be applied to the sample with an arbitrary orientation, it is applied to some special cases because of the complexity of the formulae. For uniaxial crystals two cases are discussed in detail; one with the optic axis perpendicular to the reflecting surface and the other with the optic axis in the surface. Both cases have rather simple analytic formulae and can be applied to the real ellipsometric measuremenis. LuNi2B2C sample, whose crystal structure is body centered tetragonal, was measured and the whole complex dielectric tensor was found. The possibilities and the limitations on the real measurements will be discussed.
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Electronic structures and relevant physical properties of Ni2MnGa alloy films
Kiwon Kim,Jinbae Kim,Jooyull Rhee,Meidong Huang,Nina Lee,이영백,Yurie Kudryavtsev 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
The electronic structures and physical properties of the ordered and disordered Ni2MnGa alloy lms were investigated in this study. Ordered and disordered Ni2MnGa alloy lms were prepared by ash evaporation onto substrates maintained at 720 K and 150 K, respectively. The results show that the ordered lms behave in nearly the same way as the bulk Ni2MnGa ferromagnetic shape-memory alloy, including the martensitic transformation at 200 K. It was also revealed that the lm deposition onto substrates cooled by liquid nitrogen leads to the formation of a substantially-disordered or an amorphous phase which is not ferromagnetically ordered at room temperature. An annealing of such an amorphous lm restores its crystallinity and also recovers the ferromagnetic order. It was also claried how the structural disordering in the lms in uences the physical properties, including the loss of ferromagnetism in the disordered lms, by performing electronic-structure calculations and a photoemission study.
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Maxwell's Equation for Non-diagonal Tensors and its Application to the Polar Gyrotropic Gratings
Min Hyung Cho,Yuehui Lu,Jooyull Rhee,YoungPak Lee 한국산업응용수학회 2008 한국산업응용수학회 학술대회 논문집 Vol.4 No.3
The Maxwell's equation with non-diagonal dielectric tensors are solved with rigorous coupled-wave analysis (RCWA) [1] for magnetic gratings. In order to enhance the convergence of the method, Airy-like multiple reflection series are used [2]. Numerical results are compared with experimental results and magneto-optical (MO) Kerr effects are calculated as a function of grating depth. At last, a large MO enhancement is observed for the thin gratings.
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Haq, Bakhtiar Ul,Ahmed, R.,Mohamad, Mazmira,Shaari, A.,Rhee, JooYull,AlFaify, S.,Kanoun, Mohammed Benali,Goumri-Said, Souraya ELSEVIER 2017 Current Applied Physics Vol.17 No.2
<P>Highly mismatched alloys (HMAs) are getting a substantial interest of researchers because of holding competence of rapid change in physical properties with minor compositional change and consequently showing their potential for solar energy and photovoltaic applications. In the present density functional theory based work, we design HMAs from the extremely dissimilar GaP (semiconductor) and GaBi (semi metal). The alloying of the two compounds with unmatched electronic characteristics has triggered a rapid reduction in the energy gap of GaPBi. The energy gap is reduced by 39.3 meV for every 1% increase in Bi composition. The semiconductor behavior of GaPBi based HMAs is found to be transformed to semi metallic for replacing 64.6% of P atoms by Bi. Unlike the conventional alloys, the variation in the electronic energy gap of GaP1-xBix shows deviation from the Vegard's formalism. Where the optical properties are strongly influenced with the narrowing energy gap of GaPBi. For the Bi-rich GaPBi, the notable red shift is observed in optical dielectric function and absorption spectra. Moreover, the larger atomic size of Bi has enhanced the lattice parameters of Bi-rich GaPBi. The GaPBi based HMAs with tunable energy gap in the span of 2.51 eV-0 eV and the interesting optical properties highlight them prospective materials for optoelectronic applications. (C) 2016 Elsevier B.V. All rights reserved.</P>
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