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Electrical resistivity evolution in electrodeposited Ru and Ru-Co nanowires

Journal of Materials science & technology 2022年第10期105卷 17-25页

作者： Jun Hwan Moon Seunghyun Kim Taesoon Kim Yoo Sang Jeon Yanghee Kim Jae-Pyoung Ahn Young Keun Kim Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Institute of Engineering Reserch Korea UniversitySeoul 02481Republic of Korea Advanced Analysis Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Research Resources Division Korea Institute of Science and TechnologySeoul 02792Republic of Korea

Nanoscale ruthenium(Ru)-based materials are promising replacements for existing multilayered Cu interconnects in integrated ***,it is not easy to apply the results of previously reported studies directly to the electrochemical damascene process because the previous studies have mainly focused on thin flms by dry ***,we report the electrical resistivity and microstructure of electrodeposited Ru *** estimate that the resistivity value of a 10 nm diameter Ru nanowire to be71.6μΩcm after analyzing the resistivity values of individual nanowires with various ***,we investigate the electrical properties of Ru_(x)Co_(1-x)nanowires where x is 0.04–0.99 at.%as possible replacements of the current Ta N barrier *** the entire composition range,the resistivity values of alloys are much lower than that of the conventional Ta ***,Ru and Ru-alloy nanowires surrounded by dielectric silica are thermally stable after 450°C heat ***,the nanoscale Ru and Ru-Co alloys possessing low resistivity values can be candidates for the interconnect and barrier materials,respectively.

关键词： Ruthenium(Ru) Ruthenium-cobalt(Ru-Co) Nanowire Electrical resistivity Microstructure Electrodeposition

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Field-tunable Weyl points and large anomalous Hall effect in the degenerate magnetic semiconductor EuMg2Bi2

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Physical Review B 2023年第12期107卷 L121112-L121112页

作者： M. Kondo M. Ochi R. Kurihara A. Miyake Y. Yamasaki M. Tokunaga H. Nakao K. Kuroki T. Kida M. Hagiwara H. Murakawa N. Hanasaki H. Sakai Department of Physics Osaka University Toyonaka Osaka 560-0043 Japan Forefront Research Center Osaka University Toyonaka Osaka 560-0043 Japan The Institute for Solid State Physics The University of Tokyo Kashiwa Chiba 277-8581 Japan Department of Physics Faculty of Science and Technology Tokyo University of Science Noda Chiba 278-8510 Japan Research and Services Division of Materials Data and Integrated System (MaDIS) National Institute for Materials Science(NIMS) Tsukuba Ibaraki 305-0047 Japan Center for Emergent Matter Science (CEMS) RIKEN Wako Saitama 351-0198 Japan Photon Factory Institute of Materials Structure Science KEK Tsukuba Ibaraki 305-0801 Japan Center for Advanced High Magnetic Field Science (AHMF) Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan Spintronics Research Network Division Institute for Open and Transdisciplinary Reserch Initiatives Osaka University Suita Osaka 565-0871 Japan

Magnets, with topologically nontrivial Dirac/Weyl points, have recently attracted significant attention owing to their unconventional physical properties, such as a large anomalous Hall effect. However, they typically have a high carrier density and a complicated band structure near the Fermi energy. In this Letter, we report a degenerate magnetic semiconductor EuMg2Bi2, which exhibits a single valley at the Γ point, where field-tunable Weyl points form via a magnetic exchange interaction with the local Eu spins. By the high-field measurements on high-quality single crystals, we observed quantum oscillations in the resistivity, elastic constant, and surface impedance, which enabled us to determine the position of the Fermi energy EF. In combination with a first-principles calculation, we revealed that the Weyl points are located in the vicinity of EF when the Eu spins are fully polarized, leading to a peak of energy-dependent anomalous Hall conductivity due to the Berry curvature. Accordingly, in the forced ferromagnetic phase, we observed a large anomalous Hall effect (Hall angle ΘAH∼0.07) qualitatively consistent with the calculation, which demonstrates a marked impact of the Weyl points in the simple band structure.

关键词： Anomalous Hall effect Electrical conductivity Fermi surface First-principles calculations Hall effect Magnetic interactions Magnetic order Magnetoresistance Magnetotransport Shubnikov-de Haas effect Spin-orbit coupling Topological Hall effect Topological materials Transport phenomena de Haas-van Alphen effect

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Study of Subject's Biological Information and Probe Operation Apply to Automate and Semi-automate Echocardiography

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2020年第7期140卷 747-753页

作者： Fuyuki, Oneyama Shuya, Mizuno Hiroaki, Semba Yasuhiko, Jimbo Fellow, Kiyoshi Kotani Graduate School of Engineering University of Tokyo 7-3-1 Hongo Bunkyo-ku. Tokyo113-0033 Japan Department of Cardiovascular Medicine University of Tokyo 7-3-1 7-3-1 Hongo Bunkyo-ku. Tokyo113-0033 Japan Reserch Center for Advanced Science and Technology University of Tokyo 4-6-1 4-6-1 Komaba Meguro-ku. Tokyo153-8904 Japan

Ultrasonography is noninvasive and easy to perform, so it is usually used for treatment of myocardial infarction . However, the inspection technology is difficult, and a system to replace the inspection has not been developed. We have developed a measurement environment that extracts inspection techniques by measuring subjects, probe position, respiration and the force that the operator applies to the probe. We evaluated the techniques of the sonographer and developed a system that non-medical personnel imitates ultrasonography performed by *** the future, we aim to develop a diagnosis environment automated by robots using such information. © 2020 Institute of Electrical Engineers of Japan. All rights reserved.

关键词： Ultrasonography

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Development of a plasma spectroscopic instrument by an image processing method and verifications

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2015年第1期135卷 111-116页

作者： Kumadaki, Masahiko Sato, Kohki Itoh, Hidenori Muroran Institute of Technology 27-1 Mizumoto-cho Muroran Hokkaido050-8585 Japan Center of Environmental Science Disaster Mitigation for Advanced Reserch Muroran Institute of Technology 27-1 Mizumoto-cho Muroran Hokkaido050-8585 Japan

Plasma measuring methods have been developed to measure the properties of plasmas which cannot be touched directly. For instance, Quadropole Mass Spectroscopy (QMS) was developed to survey what kinds of compound are included in the plasma directly. We have measured by using Plasma Emission Spectroscopy method. It has been considered to be one of the effective method because of not affecting the plasma. We have developed a new type of plasma spectroscopic device by an image processing method. On this paper, we'd like to report advantages and differences between the new device and the old one. © 2015 The Institute of Electrical Engineers of Japan.

关键词： Image processing

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Deposition of boron nitride films using RF plasma CVD method

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IEEJ Transactions on Fundamentals and Materials 2014年第6期134卷 397-401+4页

作者： Inao, Takuro Kumadaki, Masahiko Satoh, Kohki Yoshino, Masaki Itoh, Hidenori Division of Information and Electronic Engineering Graduate School of Engineering Muroran Institute of Technology 27-1 Mizumoto Muroran 050-8585 Japan Center of Environmental Science Disaster Mitigation for Advanced Reserch Muroran Institute of Technology 27-1 Mizumoto Muroran 050-8585 Japan Department of Electronic and Information Technology Hokkaido Polytechnic College 3-190 Zenibako Otaru 047-0292 Japan

Recently, as a great demand for high-strength and high-hardness materials is rising, improvement in performance of tools which manufacture those materials is being needed. Generally, tools to manufacture such materials are given high-hardness coating. Diamond and DLC (diamond like carbon) film are regarded as typical high-hardness materials, though, they can't be given to iron tools because carbons contained in them have high reactivity to iron. Consequently, the boron-nitride film which doesn't contain any carbons is expected as a coating material which can be adapted to iron tools. In this research, we prepared boron-nitride thin films on Si substrate using RF plasma CVD (chemical vapor deposition) method apparatus with a gas mixture of argon, nitrogen and trimethylborate (TMB: B(OCH3)3). © 2014 The Institute of Electrical Engineers of Japan.

关键词： Thin films

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Optical Absorption by E_+ Miniband of GaAs:N δ-Doped Superlattices

Optical Absorption by E_+ Miniband of GaAs:N δ-Doped Superl...

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IEEE Photovoltaic Specialists Conference

作者： Shuhei Yagi Shunsuke Noguchi Yasuto Hijikata Shigeyuki Kuboya Kentaro Onabe Yoshitaka Okada Hiroyuki Yaguchi Graduate School of Science and Engineering Saitama University Saitama Saitama 338-8570 JAPAN Department of Advanced Materials Science The University of Tokyo Kashiwa 277-8561 JAPAN Reserch Center for Advanced Science and Technology The University of Tokyo Tokyo 153-8904 JAPAN

ISBN: (纸本)9781479933006

The optical properties of GaAs:N δ-doped superlattices (SLs) are investigated by photoreflectance (PR), photo luminescence (PL) and photoluminescence excitation (PLE) spectroscopy. A direct evidence of the optical absorption due to an E+ related band of a GaAs:N δ-doped SLs is indicated as a clear absorption edge at 1.6 eV by PLE. AlGaAs layers fabricated on the both sides of the SL region exclude the effect of GaAs absorption on the PLE spectrum, resulting in the successful detection of the absorption property of the SL. In addition, some preliminary characterization of a solar cell using a GaAs:N δ-doped SL is shown. The photocarrier generation originating from SL miniband absorption is confirmed by quantum efficiency measurements.

关键词： III-V semiconductor materials superlattices spectroscopy solar energy nanostructures

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Poster abstracts

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Sleep and Biological Rhythms 2016年第1期5卷 A1-A189页

作者： J. Ferrie M. Shipley F. Cappuccio E. Brunner M. Miller M. Kumari M. Marmot A. Coenen J. L. Castillo F. Araya G. Bustamante L. Montecino C. Torres S. Oporto J. Gronli E. Fiske R. Murison B. Bjorvatn E. Sorensen R. Ursin C. M. Portas S. Rajaraman A. Gribok N. Wesensten T. Balkin J. Reifman N. Dursunoglu S. Ozkurt S. Baser O. Delen S. Sarikaya P. Sadler P. Mitchell D. Françon M. Decobert B. Herve A. Richard G. Griebel P. Avenet B. Scatton G. L. Fur D. Eckert A. Jordan A. Wellman S. Smith A. Malhotra D. White D. Bruck I. Thomas A. Kritikos W. Oertel K. Stiasny-Kolster D. Garcia-Borreguero W. Poewe B. Hoegl R. Kohnen E. Schollmayer J. Keffel C. Trenkwalder A. Valle S. Roizenblatt F. Fregni P. Boggio S. Tufik K. Ward L. Robertson L. Palmer P. Eastwood D. Hillman J. Lee S. Mukherjee V. de Padova G. Barbato G. Ficca I. Zilli P. Salzarulo M. Veldi T. Hion V. Vasar M. Kull L. Nowak J. Davis Y. Latzer O. Tzischinsky S. Crowley M. Carskadon M. Anca-Herschkovitsch D. Frey J. Ortega C. Wiseman C. Farley K. Wright A. Campbell A. Neill K. Spiegel R. Leproult E. Tasali N. Scherberg E. van Cauter A. T. Noradina N. A. Karim I. Norlinah A. A. Raymond R. Sahathevan B. Hamidon E. Werth R. Poryazova R. Khatami C. Bassetti R. G. Beran L. Ainley G. Holand J. Duncan H. Kinney B. Davis B. Hood S. Frey C. Schmidt M. Hofstetter P. Peigneux C. Cajochen W.-P. Hu J.-D. Li C. Zhang L. Boehmer J. Siegel Q.-Y. Zhou Y. Sagawa H. Kondo T. Takemura H. Kanayama Y. Kaneko M. Sato T. Kanbayashi Y. Hishikawa T. Shimizu A. Viola L. James L. Schlangen D.-J. Dijk R. Andretic Y.-C. Kim K.-A. Han F. Jones R. Greenspan L. Sanford L. Yang X. Tang K. Dieter E. Uta H. Sven M. Richard N. Oyane S. Pallesen F. Holsten Y. Inoue M. Fujita N. Emura K. Kuroda N. Uchimura A. Johnston J. Astbury G. Kennedy K. Hoedlmoser M. Schabus T. Pecherstorfer S. Moser G. Gruber P. Anderer W. Klimesch N. Naidoo M. Ferber A. Pack D. Neu O. Mairesse G. Hoffmann A. Dris L. Lambrecht P. Linkowski P. Verbanck O. Le Bon N. Matsuura M. Yamao N. Adachi R. Aritomi Y. Komada H. Tanaka S. Shirak University College London London UK University College London London USA Warwick Medical School London UK Warwick Medical School Coventry USA Radboud University Nijmegen Nijmegen Netherlands Department of Neurology University of Chile Santiago Chile Neurology Service Hospital del Salvador Santiago Chile Family Health Center Juan Pablo II Santiago Chile Department of Biomedicine Section on Physiology Univeristy of Bergen Bergen Norway Department of Public Health and Primary Health Care Univeristy of Bergen Bergen Norway Department of Public Health and Primary Health Care University of Bergen Bergen Norway Norwegian Competence Center for Sleep Disorders Haukeland University Hospital Bergen Norway Department of Child and Adolescent Psychiatry Haukeland University Hospital Univeristy of Bergen Bergen Norway Department of Biomedicine University of Bergen Bergen Norway US Army Medical Research and Materiel Command Fort Detrick Frederick USA Walter Reed Army Institute of Research Silver Spring USA Department of Behavioral Biology Walter Reed Army Institute of Research Silver Spring USA Faculty Department of Pulmonology Pamukkale University Medical Denizli Turkey University of Ballarat Ballarat Australia Sanofi-Aventis Recherche et Developpement Paris France Brigham and Women’s Hospital Harvard Medical School Boston USA The University of Queensland Adelaide Australia School of Psychology University of Queensland Brisbane Australia The University of Queensland Brisbane Australia Victoria University Melbourne Australia Department of Psychology Victoria University Melbourne Australia School of Psychology Victoria University Melbourne Australia Philips-Universität Marburg Germany Philips-Universitaet-Marburg Marburg Germany Instituto de Investigaciones del Sueno Madrid Spain Universitätsklinik für Neurologie Innsbruck Austria Universitaetsklinik fuer Neurologie Innsbruck Austria IMEREM GmbH Nuernberg Germany Schwarz Pharma AG Monheim Germany

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Cherenkov radiation from the three -Dimensional cascade shower for electron neutrino

Cherenkov radiation from the three -Dimensional cascade show...

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30th International Cosmic Ray Conference, ICRC 2007

作者： Takahashi, N. Nakamura, I. Misaki, A. Department of Advanced Physics Hirosaki University Hirosaki Japan Molecular Analysis and Life Science center Saitama University Saitama Japan Reserch Institute for Science and Technology Waseda University Tokyo Japan

In high energy neutrino astrophysics experiment, such as, NT-2000,AMANDA, ANTARES, we could get reliable information on electron neutrino events than that on muon neutrino due to muon, because the electron cascade showers due to the electron neutrino events are recognized as Fully Contained Events, while, the muon neutrino events are done as Partially Contained Events exclusively. We calculate the three-dimensional structure of the Cherenkov radiation from the one dimensional cascade shower, by using the exact Monte Carlo method which are expected to be available for the reliable analysis of the electron neutrino events as the first step of construction from the three-dimensional cascade showers.

关键词： Monte Carlo methods

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Enhanced Maximum Modal Gain of 1.3-μm Antimony Mediated InAs Self-Assembled Quantum-Dot Lasers

Enhanced Maximum Modal Gain of 1.3-μm Antimony Mediated InA...

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Indium Phosphide and Related Materials Conference

作者： M. Ishida K. Watanabe N. Kumagai Y. Nakata N. Hatori H. Sudo T. Yamamoto M. Sugawara Y. Arakawa IIS & RCAST The University of Tokyo Tokyo JAPAN Reserch Center for for Advanced Science and Technology (RCAST) The University of Tokyo Tokyo JAPAN Fujitsu Ltd. Atsugi JAPAN Optoelectronic Industry and Technology Development Association (OITDA) Tokyo JAPAN QD Laser Inc. Chiyoda-ku Tokyo JAPAN

Gain characteristics of antimony-mediated high-density InAs quantum-dot lasers were evaluated. For the lasers with 5 and 10 quantum dot layers, 88% and 39% increase in the maximum modal gain, respectively, was obtaine... 详细信息

关键词： Quantum dot lasers Quantum dots Mediation Bandwidth Solids Degradation Indium phosphide Optical materials Conference proceedings International collaboration

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Alcohol electrooxidation at Pt-Ru sputter-deposited electrode

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IEEJ Transactions on Power and Energy 2006年第9期126卷 940-946页

作者： Shibamine, Masahiko Yamada, Akifumi Umeda, Minoru Tanaka, Shohji Department of Materials Science and Technology Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Advanced Technology R and D Center Enviromental Technology Reserch Department Ricoh Co. Ltd. 16-1 Shinei-cho Tsuzuki-ku Yokohama 224-0035 Nagaoka University of Technology Ricoh Co. Ltd.

The use of various alcohols including methanol has been considered as the fuel of direct alcohol fuel cells (DAFCs). Thus far, the Pt alloys have mainly been studied as anode electrocatalysts for DAFCs. Pt itself is poisoned by chemical species produced during the alcohol oxidation. There exist many reports that the addition of Ru is effective for the alcohol oxidation. In this work, we prepared Pt-Ru co-sputtered electrode by changing Ru content, sputtering time and Ar pressure for the sputtering. By using the prepared electrocatalysts, relationships between sputtering conditions and electrocatalytic activity were measured for some alcohols.

关键词： Alcohols

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