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Symposium on VLSI technology

作者： d.H. Kang J.S. Kim Y.r. Kim Y.T. Kim M.K. Lee Y.J. Jun J.H. Park F. Yeung C.W. Jeong J. Yu J.H. Kong d.W. Ha S.A. Song J. Park Y.H. Park Y.J. Song C.Y. Eum K.C. ryoo J.M. Shin d.W. Lim S.S. Park J.H. Kim W.I. Park K.r. Sim J.H. Cheong J.H. Oh J.I. Kim Y.T. Oh K.W. Lee S.P. Koh S.H. Eun N.B. Kim G.H. Koh G.T. Jeong H.S. Jeong Kinam Kim Advanced Technology Development Team 2 Yongin-City Gyunggi-Do South Korea Semi. Business Samsung Electronic Co. Ltd. Yongin-City Gyunggi-Do South Korea CAE Yongin-City Gyunggi-Do South Korea Analytical Engineering Center Samsung Advanced Institute of Technology Yongin-City Gyunggi-Do South Korea Process Analysis & Control Group Memory R&D Div. Yongin-City Gyunggi-Do South Korea

ISBN: (纸本)4900784036;97

Programming with larger current than optimized one is often preferable to ensure a good resistance distribution of high-resistive reset state in high-density phase-change random access memories because it is very effective to increase the resistance of cells to a target value. In this paper, we firstly report that this larger current writing may conversely degrade the reset distribution by reducing the resistance of normal cells via the partial crystallization of amorphous Ge 2 Sb 2 Te 5 and this degradation can be suppressed by designing a novel cell structure with a heat dissipating layer.

关键词： Phase change random access memory Crystallization degradation Amorphous materials Writing resistance heating Temperature Phase change materials Switches Cooling

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Nanoscale elastic inhomogeneity of a Pd-based metallic glass: Sound velocity from ultrasonic and inelastic x-ray scattering experiments

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Physical review B 2007年第14期76卷 140201(R)-140201(R)页

作者： T. Ichitsubo S. Hosokawa K. Matsuda E. Matsubara N. Nishiyama S. Tsutsui A. Q. r. Baron Department of Materials Science and Engineering Kyoto University Kyoto 606-8501 Japan Center for Materials Research using Third-Generation Synchrotron Radiation Facilities Hiroshima Institute of Technology Hiroshima 731-5193 Japan RIMCOF R&D Institute of Metals and Composites for Future Industries Sendai 980-8577 Japan SPring-8/JASRI 1-1-1 Kouto Sayo-cho Hyogo-ken 679-5198 Japan SPring-8/RIKEN 1-1-1 Kouto Sayo-cho Hyogo-ken 679-5148 Japan

In this paper, we show experimentally that the sound velocity of nanometer wavelength exceeds that of millimeter wavelength for a Pd-based metallic glass completely frozen far below the glass transition temperature. This indicates that nanoscale elastically harder regions exist in the glass matrix and, hence, elastically softer regions are also present so as to realize the macroscopic elasticity.

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Observation of a Superconducting Gap in Boron-doped diamond by Laser-Excited Photoemission Spectroscopy

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Physical review Letters 2007年第4期98卷 047003-047003页

作者： K. Ishizaka r. Eguchi S. Tsuda T. Yokoya A. Chainani T. Kiss T. Shimojima T. Togashi S. Watanabe C.-T. Chen C. Q. Zhang Y. Takano M. Nagao I. Sakaguchi T. Takenouchi H. Kawarada S. Shin Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan The Institute of Physical and Chemical Research (RIKEN) Sayo-gun Hyogo 679-5143 Japan The Graduate School of Natural Science and Technology Okayama University Okayama 700-8530 Japan The Institute of Physical and Chemical Research (RIKEN) Wako Saitama 351-0198 Japan Beijing Center for Crystal R&D Chinese Academy of Science Zhongguancun Beijing 100080 China National Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan School of Science and Engineering Waseda University Shinjuku Tokyo 169-8555 Japan

We investigate the temperature (T)-dependent low-energy electronic structure of a boron-doped diamond thin film using ultrahigh resolution laser-excited photoemission spectroscopy. We observe a clear shift of the leading edge below T=11 K, indicative of a superconducting gap opening (Δ∼0.78 meV at T=4.5 K). The gap feature is significantly broad and a well-defined quasiparticle peak is lacking even at the lowest temperature of measurement (=4.5 K). We discuss our results in terms of disorder effects on the normal state transport and superconductivity in this system.

关键词： diamonds

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Triple-write One-lens Optical Pickup for Blu-ray disc/dVd/Cd Supporting 4x Blu-ray read/Write

Triple-write One-lens Optical Pickup for Blu-ray Disc/DVD/CD...

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2007 International Conference on Consumer Electronics (ICCE 2007)

作者： F. Issiki N. Maeda K. Kimura H. Suenaga T. Kurokawa Ubiquitous Platform Systems R&D Laboratory Storage Systems Research Center Hitachi and Limited Japan 2nd Department Mechanical Engineering Research Laboratory Hitachi and Limited Japan 1st Engineering Department Optical Pickup Business Division Hitachi Media Electronics Company Limited Japan Central Research Laboratory Storage Technology Research Center Hitachi and Limited Japan

A Blu-ray disc (Bd) / digital Versatile disc (dVd) / Compact disc (Cd) compatible optical pickup supporting Blu-ray 4x read/write has been developed. To achieve 4x speed for Bd, a one-lens-type objective lens was adopted to ensure stability for high-speed tracking servo control. Optical system, signal characteristics, and actuator vibration characteristics of the developed pickup are presented.

关键词： dVd Actuators High speed optical techniques Lenses resonance resonant frequency Servosystems Laboratories Laser beams Stability

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Cavity-backed MEMS patch antennas on double-layer silicon wafers

Cavity-backed MEMS patch antennas on double-layer silicon wa...

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IEEE Antennas and Propagation Society International Symposium, APS 2006

作者： Koga, Yoko Yoshida, Yukihisa Yamashita, Akira Hamaguchi, Tsuneo Nishizawa, Kazushi Taguchi, Motohisa Nishino, Tamotsu Miyashita, Hiroaki Makino, Shigeru Mitsubishi Electric Corporation Information Technology R&D Center 5-1-1 Ofuna Kamakura247-8501 Japan Advanced Technology R&D Center Manufacturing Engineering Center 8-1-1 Tsugkaguchi-honmachi Amagasaki661-8661 Japan

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Structure and free volume properties of semi-crystalline poly(3-hydroxybutyrate-co-3-hydroxyvalerate) by positron annihilation lifetime analysis

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physica status solidi c 2007年第10期4卷

作者： Mei-Ling Cheng Yi-Ming Sun Department of Chemical Engineering and Materials Science Yuan Ze University 135 Yuan-Tung Rd. Chung-Li Taoyuan 32003 Taiwan ROC R&D Center for Membrane Technology Chung Yuan University 493 Sin Chung Pei Rd. Chung-Li Taoyuan 32023 Taiwan ROC

The effect of thermal history on the structure and free volume of bacterial poly(3-hydroxybutyrate-co-5mol%-3-hydroxyvalerate) (PHBV5) membranes, prepared by the compression-molding method, was investigated. Free volume size, number of free volume holes, and the distribution of free volume in slow-, rapid-, and step-cooled semi-crystalline PHBV5 membranes were measured by using positron annihilation lifetime spectroscopy (PALS). The lifetime spectra are resolved into four components and the corresponding annihilation mechanisms are addressed. The size of the free volume in the amorphous phase and the lamellar thickness and crystallite size in the crystalline phase of the slow-cooled membrane were the largest among all kinds of membranes. The results suggest that the crystallization process not only affects the crystalline structure but also has impact on the free volume properties in amorphous phase of the polymers. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词： 46.70.Hg 61.41.+e 78.70.Bj 82.35.Lr 82.35.Pq

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Fabrication of Ordered Porous SWNT-Polymer Nanocomposites by Emulsion Templating

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Macromolecular Symposia 2007年第1期249-250卷

作者： Sun Hwa Lee Hyeong Taek Ham Ji Sun Park In Jae Chung Sang Ouk Kim Department of Material Science and Engineering Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Korea Chemicals R&D center SK Corporation 140-1 Wonchon-dong Yuseong-gu Daejeon 305-712 Korea Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Yuseong-gu Daejeon 305-701 Korea

Porous polymer films were produced from water-in-oil emulsion. Aqueous droplets were dispersed in PMMA/benzene solution without any emulsifier. Simple dip-coating of the emulsion on a substrate and air-drying led to hexagonally ordered porous thin films. Porous single walled carbon nanotubes (SWNT)-polymer composite films were prepared through the similar procedures also. The electrical conductivity of porous SWNT-polymer composites increased with the content of SWNT.

关键词： carbon nanotube nanocomposite PMMA porous thin film

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Applications of positron annihilation to polyamide membranes

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physica status solidi c 2007年第10期4卷

作者： Hongmin Chen Guang Liu Lakshmi Chakka Shu-Hsien Huang Kueir-rarn Lee Juin-Yih Lai Yi-Ming Sun Mei-Ling Cheng Y. C. Jean Department of Chemistry University of Missouri Kansas City Kansas City MO 64110 USA R&D Center for Membrane Technology Chung Yuan Christian University Chung-Li 32023 Taiwan Department of Chemical Engineering Chung Yuan Christian University Chung-Li 32023 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li 32003 Taiwan

Positron annihilation spectroscopy (PAS) has been used to study the depth profile (0 - 8 µm) in a membrane system containing a thin layer of polyamide prepared by the interfacial polymerization of triethylenetetraamine (TETA) and trimesoyl chloride (TMC) onto the surface of asymmetric polyacrylnitrile (PAN). doppler broadening S parameters of annihilation radiation energy spectra show a systematic variation with the doping time of TETA in the membrane preparation process of interfacial polymerization. The layer structures of composite membrane are obtained. A similar variation between S parameters with respect to TETA doping time and permeability but an anti-correlation between S parameter and selectivity are observed. Future applications of PAS and slow positron beam to membrane technology appear to be promising. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

关键词： 46.70.Hg 61.43.Gt 68.35.Fx 78.70.Bj 82.35.Lr

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Characterization of ZnO-based multilayer varistor sintered by hot-press sintering

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JAPANESE JOUrNAL OF APPLIEd PHYSICS PArT 1-rEGULAr PAPErS BrIEF COMMUNICATIONS & rEVIEW PAPErS 2006年第4A期45卷 2689-2694页

作者： Lee, WH Chen, WT Hu, CL Lee, YC Lin, SP Su, CY Department of Electrical Engineering National Cheng Kung University Taiwan R&D Technology Center Yageo Corporation Nantze Branch Taiwan

To attain the homogeneous microstructure of ZnO-based multilayer varistors (MLVs), hot-press sintering is conducted. To determine the effect of hot-press sintering on the microstructure, the dielectric and varistor properties of ZnO-based MLVs were investigated and compared with those of ZnO-based MLVs fabricated by free sintering. In hot-press sintering, the average grain size and the distribution of grain size of a ZnO-based MLVs are both reduced. The results show that the leakage current and nonlinear coefficient alpha of ZnO-based MLVs can be improved. The increase in nonlinear coefficient (ce) is directly related to the inhibition of grain growth of ZnO grains when hot-press sintering is performed instead of free sintering. Note that the energy absorption capabilities in terms of peak current (PC) measurements of ZnO-based MLVs are remarkably improved due to the homogeneity of microstructure when hot-press sintering is conducted.

关键词： ZnO MLV peak current hot-pressing sintering

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Effects of dopant on the dielectric properties of CaZrO₃ ceramic sintered in a reducing atmosphere

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JAPANESE JOUrNAL OF APPLIEd PHYSICS PArT 1-rEGULAr PAPErS BrIEF COMMUNICATIONS & rEVIEW PAPErS 2006年第7期45卷 5853-5858页

作者： Lee, W. S. Su, C. Y. Lee, Y. C. Lin, S. P. Yang, Tony Department of Electrical Engineering National Cheng Kung University Taiwan R&D Technology Center Yageo Corporation Nantze Branch Taiwan

In this study, the influence of CaZrO3 doped with three dopants, SiO2, MnO, and Nb2O5, and then sintered in a reducing atmosphere on microstructure, phase formation, and electrical properties is investigated. SiO2 plays the role of sintering aid to enhance the density of CaZrO3 leading to better performance of electrical properties as a function Of SiO2 content. MnO, and Nb2O5 were incorporated into the Zr-site of CaZrO3 to make stoichometric CaZrO3 into non-stoichiometric CaZrO3 with Zr excess resulting in the formation of a second phase, CaZr4O9, which has a lower dielectric constant (13) in comparison with that of the main phase of CaZrO3 (32). Thus, the dielectric constant of CaZr03 doped with Nb2O5, or MnO is decreased markedly. In addition, Mn+2 incorporated into Zr-sites of CaZrO3 plays the role of acceptor, which compensates for the number of conduction electrons and contributes to better performance of electrical properties such as insulation resistance and tan delta. Conversely, Nb+5 incorporated into Zr-sites of CaZrO3 plays the role of donor and provides more conduction electrons, leading to poor performance of electrical properties.

关键词： stoichiometry acceptor donor CaZrO3

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