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Resistive Switching Properties and Failure Behaviors of(Pt, Cu)/Amorphous ZrO_(2)/Pt Sandwich Structures

Journal of materials science & Technology 2016年第7期32卷 676-680页

作者： Haifa Zhai Jizhou Kong Jien Yang Jing Xu Qingran Xu Hongchen Sun Aidong Li Di Wu Henan Province Key Laboratory of Photovoltaic Materials College of Physics and Electronic Engineering Henan Normal University National Laboratory of Solid State Microstructures Department of Materials Science and Engineering College of Engineering and Applied SciencesNanjing University State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics

The effect of Pt and Cu electrodes on the resistive switching properties and failure behaviors of amor- phous ZrO2 films were investigated. Compared with Cu/ZrO2/Pt structures, the Pt/ZrO2/Pt structures exhibit better resistive switching properties such as the higher resistance ratio of OFF/ON states, the longer switch- ing cycles and narrow distribution of OFF state resistance （Roff）. The switching mechanism in the Pt/ZrO2/ Pt structure can be attributed to the formation and rupture of oxygen vacancy filaments; while in the Cu/ZrO2/Pt structure, there exist both oxygen vacancy filaments and Cu filaments. The formation of Cu filaments is related to the redox reaction of Cu electrode under the applied voltage. The inhomoge- neous dispersive injection of Cu ions results in the dispersive Ro~ and significant decrease of operate voltage, Schematic diagrams of the formation of conductive filaments and the failure mechanism in the Cu/ZrO2/ Pt structures are also proposed.

关键词： ZrO2 Thin films Sol-gel method Failure

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Novel type of ferroelectricity in brownmillerite structures: A first-principles study

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Physical Review materials 2018年第8期2卷 084402-084402页

作者： Hao Tian Xiao-Yu Kuang Ai-Jie Mao Yurong Yang Hongjun Xiang Changsong Xu S. Omid Sayedaghaee Jorge Íñiguez L. Bellaiche Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA National Laboratory of Solid State Microstructures College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Physics Key Laboratory of Computational Physical Sciences (Ministry of Education) State Key Laboratory of Surface Physics Fudan University Shanghai 200433 China Microelectronics-Photonics Program and Physics Department University of Arkansas Fayetteville Arkansas 72701 USA Materials Research and Technology Department Luxembourg Institute of Science and Technology (LIST) 5 Avenue des Hauts-Fourneaux L-4362 Esch/Alzette Luxembourg

First-principles calculations are conducted on two magnetic brownmillerites, namely, Ca2Co2O5 and Sr2Co2O5. Both systems possess a previously overlooked polar Pmc21 phase that is low in energy. This ferroelectric state is even predicted to be the ground state of Sr2Co2O5, which therefore renders such material multiferroic. Strikingly, the ferroelectricity associated with this Pmc21 phase involves an original energetic coupling that is linear in the polar mode, quadratic in another distortion, and linear in a third mode. Such ferroelectricity is therefore of a novel type, since it differs from previously reported proper, improper, hybrid improper, and triggered kinds of ferroelectricity.

关键词： Defects Ferroelectricity First-principles calculations Crystal structures Multiferroics Oxides Density functional theory

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Searching for gap zeros in Sr2RuO4 via field-angle-dependent specific-heat measurement

arXiv

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arXiv 2018年

作者： Kittaka, Shunichiro Nakamura, Shota Sakakibara, Toshiro Kikugawa, Naoki Terashima, Taichi Uji, Shinya Sokolov, Dmitry A. MacKenzie, Andrew P. Irie, Koki Tsutsumi, Yasumasa Suzuki, Katsuhiro MacHida, Kazushige Institute for Solid State Physics University of Tokyo Kashiwa Chiba277-8581 Japan National Institute for Materials Science 3-13 Sakura Tsukuba Ibaraki305-0003 Japan Graduate School of Pure and Applied Sciences University of Tsukuba Tsukuba Ibaraki305-8577 Japan Max Planck Institute for Chemical Physics of Solids Nothnitzer Str. 40 Dresden01187 Germany Department of Physics Ritsumeikan University Kusatsu Shiga525-8577 Japan Department of Basic Science University of Tokyo Meguro Tokyo153-8902 Japan Condensed Matter Theory Laboratory RIKEN Wako Saitama351-0198 Japan Research Organization of Science and Technology Ritsumeikan University Kusatsu Shiga525-8577 Japan Department of Engineering Physics Electronics and Mechanics Graduate School of Engineering Nagoya Institute of Technology Nagoya466-8555 Japan

The gap structure of Sr2RuO4, which is a longstanding candidate for a chiral p-wave superconductor, has been investigated from the perspective of the dependence of its specific heat on magnetic field angles at temperatures as low as 0.06 K (∼ 0.04Tc). Except near Hc2, its fourfold specific-heat oscillation under an in-plane rotating magnetic field is unlikely to change its sign down to the lowest temperature of 0.06 K. This feature is qualitatively different from nodal quasiparticle excitations of a quasi-two-dimensional superconductor possessing vertical lines of gap minima. The overall specific-heat behavior of Sr2RuO4 can be explained by Doppler-shifted quasiparticles around horizontal line nodes on the Fermi surface, whose in-plane Fermi velocity is highly anisotropic, along with the occurrence of the Pauli-paramagnetic effect. These findings, in particular, the presence of horizontal line nodes in the gap, call for a reconsideration of the order parameter of Sr2RuO4. Copyright © 2018, The Authors. All rights reserved.

关键词： Ruthenium compounds

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Anisotropic charge density wave in layered 1T−TiSe2

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Physical Review materials 2017年第5期1卷 054002-054002页

作者： Qiao Qiao Songsong Zhou Jing Tao Jin-Cheng Zheng Lijun Wu Samuel T. Ciocys Maria Iavarone David J. Srolovitz Goran Karapetrov Yimei Zhu Department of Physics Temple University Philadelphia Pennsylvania 19122 USA Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Physics and Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices Xiamen University Xiamen Fujian 361005 China Department of Physics Drexel University Philadelphia Pennsylvania 19104 USA Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania Philadelphia Pennsylvania 19104 USA

We present a three-dimensional study on the anisotropy of the charge density wave (CDW) in 1T−TiSe2, by means of in situ atomically resolved electron microscopy at cryogenic temperatures in both reciprocal and real spaces. Using coherent nanoelectron diffraction, we observed short-range coherence of the in-plane CDW component while the long-range coherence of out-of-plane CDW component remains intact. An in-plane CDW coherence length of ∼10nm and an out-of-plane CDW coherence length of 17.5 nm, as a lower bound, were determined. The electron modulation was observed using electron energy-loss spectroscopy and verified by an orbital-projected density of states. Our integrated approach reveals anisotropic CDW domains at the nanoscale, and illustrates electron modulation-induced symmetry breaking of a two-dimensional material in three dimensions, offering an opportunity to study the effect of reduced dimensionality in strongly correlated systems.

关键词： Charge density waves Transition metal dichalcogenides Density functional theory Electron diffraction Electron energy loss spectroscopy Scanning transmission electron microscopy Transmission electron microscopy

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Jamming of Deformable Polygons

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Physical Review Letters 2018年第24期121卷 248003-248003页

作者： Arman Boromand Alexandra Signoriello Fangfu Ye Corey S. O’Hern Mark D. Shattuck Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics Institute of Physics Chinese Academy of Sciences Beijing China Department of Mechanical Engineering and Materials Science Yale University New Haven Connecticut 06520 USA Program in Computational Biology and Bioinformatics Yale University New Haven Connecticut 06520 USA School of Physical Sciences University of Chinese Academy of Sciences Beijing China Department of Physics Yale University New Haven Connecticut 06520 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA Benjamin Levich Institute and Physics Department The City College of the City University of New York New York New York 10031 USA

We introduce the deformable particle (DP) model for cells, foams, emulsions, and other soft particulate materials, which adds to the benefits and eliminates deficiencies of existing models. The DP model combines the ability to model individual soft particles with the shape-energy function of the vertex model, and adds arbitrary particle deformations. We focus on 2D deformable polygons with a shape-energy function that is minimized for area a0 and perimeter p0 and repulsive interparticle forces. We study the onset of jamming versus particle asphericity, A=p02/4πa0, and find that the packing fraction grows with A until reaching A*=1.16 of the underlying Voronoi cells at confluence. We find that DP packings above and below A* are solidlike, which helps explain the solid-to-fluid transition at A* in the vertex model as a transition from tension- to compression-dominated regimes.

关键词： Jamming Monolayer films Molecular dynamics

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Effects of Process Parameters on the Interlaminar Fracture Toughness of GF-PA6-Tapes

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PAMM 2018年第1期17卷

作者： Michael Schober Takashi Kuboki Ehsan Ameri Jörg Hohe Gumbsch Peter Karlsruhe Institute of Technology (KIT) Institute for Applied Materials - Computational Materials Science (IAM-CMS) University of Western Ontario (UWO) Department of Mechanical and Materials Engineering Fraunhofer Project Centre for Composite Research University of Western Ontario (UWO) Fraunhofer Insitute for Mechanics of Materials IWM

Interlaminar fracture toughness of consolidated, continuous glass fiber reinforced polyamide-6 tapes, as well as its sensitivity to process parameters are investigated in this study. Therefore, consolidated plaques are manufactured, varying consolidation temperature and pressure, and their delamination behavior in mode I and mode II is analyzed by means of DCB and ENF tests. (© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)

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Identification of Antiferromagnetic Domains Via the Optical Magnetoelectric Effect

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Physical Review Letters 2018年第5期121卷 057601-057601页

作者： Vilmos Kocsis Karlo Penc Toomas Rõõm Urmas Nagel Jakub Vít Judit Romhányi Yusuke Tokunaga Yasujiro Taguchi Yoshinori Tokura István Kézsmárki Sándor Bordács RIKEN Center for Emergent Matter Science (CEMS) Wako Saitama 351-0198 Japan Department of Physics Budapest University of Technology and Economics and MTA-BME Lendület Magneto-optical Spectroscopy Research Group 1111 Budapest Hungary Institute for Solid State Physics and Optics Wigner Research Centre for Physics Hungarian Academy of Sciences H-1525 Budapest P.O.B. 49 Hungary National Institute of Chemical Physics and Biophysics 12618 Tallinn Estonia Institute of Physics ASCR Na Slovance 2 182 21 Prague 8 Czech Republic Faculty of Nuclear Science and Physical Engineering Czech Technical University Břehová 7 115 19 Prague 1 Czech Republic Okinawa Institute of Science and Technology Graduate University Onna-son Okinawa 904-0395 Japan Department of Advanced Materials Science University of Tokyo Kashiwa 277-8561 Japan Quantum-Phase Electronics Center Department of Applied Physics University of Tokyo Tokyo 113-8656 Japan Department of Applied Physics University of Tokyo Hongo Tokyo 113-8656 Japan Experimental Physics 5 Center for Electronic Correlations and Magnetism Institute of Physics University of Augsburg 86159 Augsburg Germany Hungarian Academy of Sciences Premium Postdoctor Program 1051 Budapest Hungary

The ultimate goal of multiferroic research is the development of a new-generation nonvolatile memory devices, where magnetic bits are controlled via electric fields with low energy consumption. Here, we demonstrate the optical identification of magnetoelectric (ME) antiferromagnetic (AFM) domains in the LiCoPO4 exploiting the strong absorption difference between the domains. This unusual contrast, also present in zero magnetic field, is attributed to the dynamic ME effect of the spin-wave excitations, as confirmed by our microscopic model, which also captures the characteristics of the observed static ME effect. The control and the optical readout of AFM/ME domains, demonstrated here, will likely promote the development of ME and spintronic devices based on AFM insulators.

关键词： Magnetoelectric effect Optical & microwave phenomena Multiferroics Single crystal materials Terahertz spectroscopy

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Iran in transition (vol 393, pg 1984, 2019)

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LANCET 2019年第10186期393卷 2124-2124页

作者： Danaei, G. Farzadfar, F. Kelishadi, R. [a]Department of Global Health and Population and Department of Epidemiology Harvard T H Chan School of Public Health Boston MA USA Department of Global Health and Population and Department of Epidemiology Harvard T H Chan School of Public Health Boston MA USA [b]Scientific Association for Public Health in Iran Boston MA USA Scientific Association for Public Health in Iran Boston MA USA [c]Non-Communicable Diseases Research Center Endocrinology and Metabolism Population Sciences Institute Tehran University of Medical Sciences Tehran Iran Non-Communicable Diseases Research Center Endocrinology and Metabolism Population Sciences Institute Tehran University of Medical Sciences Tehran Iran [d]Endocrinology and Metabolism Research Center Tehran University of Medical Sciences Tehran Iran Endocrinology and Metabolism Research Center Tehran University of Medical Sciences Tehran Iran [e]Diabetes Research Center Tehran University of Medical Sciences Tehran Iran Diabetes Research Center Tehran University of Medical Sciences Tehran Iran [f]Endocrinology and Metabolism Clinical Sciences Institute Department of Health Management and Economics Tehran University of Medical Sciences Tehran Iran Endocrinology and Metabolism Clinical Sciences Institute Department of Health Management and Economics Tehran University of Medical Sciences Tehran Iran [g]Department of Global Health and Public Policy Tehran University of Medical Sciences Tehran Iran Department of Global Health and Public Policy Tehran University of Medical Sciences Tehran Iran [h]Department of Epidemiology and Biostatistics Tehran University of Medical Sciences Tehran Iran Department of Epidemiology and Biostatistics Tehran University of Medical Sciences Tehran Iran [i]School of Public Health Tehran University of Medical Sciences Tehran Iran School of Public Health Tehran University of Medical Sciences Tehran Iran [j]Faculty of Medicine Tehran University of Medical Sciences Tehran Iran Faculty of Medicine Te

Summary Being the second-largest country in the Middle East, Iran has a long history of civilisation during which several dynasties have been overthrown and established and health-related structures have been reorganised. Iran has had the replacement of traditional practices with modern medical treatments, emergence of multiple pioneer scientists and physicians with great contributions to the advancement of science, environmental and ecological changes in addition to large-scale natural disasters, epidemics of multiple communicable diseases, and the shift towards non-communicable diseases in recent decades. Given the lessons learnt from political instabilities in the past centuries and the approaches undertaken to overcome health challenges at the time, Iran has emerged as it is today. Iran is now a country with a population exceeding 80 million, mainly inhabiting urban regions, and has an increasing burden of non-communicable diseases, including cardiovascular diseases, hypertension, diabetes, malignancies, mental disorders, substance abuse, and road injuries.

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Nitride alloy layer formation of duplex stainless steel using nitriding process

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IOP Conference Series: materials science and engineering 2018年第1期290卷

作者： M A Maleque P H Lailatul A A Fathaen K Norinsan J. Haider Department of Manufacturing and Materials Engineering Kuliyyah of Engineering International Islamic University Malaysia P.O. Box 10 50728 Gombak Kuala Lumpur Malaysia. Materials Science Program School of Applied Physics Faculty Science and Technology National University of Malaysia 43600 Bangi Selangor. Faculty of Science and Engineering Manchester Metropolitan University U. K.

Duplex stainless steel (DSS) shows a good corrosion resistance as well as the mechanical properties. However, DSS performance decrease as it works under aggressive environment and at high temperature. At the mentioned environment, the DSS become susceptible to wear failure. Surface modification is the favourable technique to widen the application of duplex stainless steel and improve the wear resistance and its hardness properties. Therefore, the main aim of this work is to nitride alloy layer on the surface of duplex stainless steel by the nitriding process temperature of 400°C and 450°C at different time and ammonia composition using a horizontal tube furnace. The scanning electron microscopy and x-ray diffraction analyzer are used to analyse the morphology, composition and the nitrided alloy layer for treated DSS. The micro hardnesss Vickers tester was used to measure hardness on cross-sectional area of nitrided DSS. After nitriding, it was observed that the hardness performance increased until 1100 Hv0.5kgf compared to substrate material of 250 Hv0.5kgf. The thickness layer of nitride alloy also increased from 5μm until 100μm due to diffusion of nitrogen on the surface of DSS. The x-ray diffraction results showed that the nitride layer consists of iron nitride, expanded austenite and chromium nitride. It can be concluded that nitride alloy layer can be produced via nitriding process using tube furnace with significant improvement of microstructural and hardness properties.

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Load and Time Dependence of Interfacial Chemical Bond-Induced Friction at the Nanoscale

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Physical Review Letters 2017年第7期118卷 076103-076103页

作者： Kaiwen Tian Nitya N. Gosvami David L. Goldsby Yun Liu Izabela Szlufarska Robert W. Carpick Department of Physics and Astronomy University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Earth and Environmental Sciences University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Chemistry and Chemical Biology Harvard University Cambridge Massachusetts 02138 USA Department of Materials Science and Engineering University of Wisconsin–Madison Madison Wisconsin 53706 USA

Rate and state friction (RSF) laws are widely used empirical relationships that describe the macroscale frictional behavior of a broad range of materials, including rocks found in the seismogenic zone of Earth’s crust. A fundamental aspect of the RSF laws is frictional “aging,” where friction increases with the time of stationary contact due to asperity creep and/or interfacial strengthening. Recent atomic force microscope (AFM) experiments and simulations found that nanoscale silica contacts exhibit aging due to the progressive formation of interfacial chemical bonds. The role of normal load (and, thus, normal stress) on this interfacial chemical bond-induced (ICBI) friction is predicted to be significant but has not been examined experimentally. Here, we show using AFM that, for nanoscale ICBI friction of silica-silica interfaces, aging (the difference between the maximum static friction and the kinetic friction) increases approximately linearly with the product of the normal load and the log of the hold time. This behavior is attributed to the approximately linear dependence of the contact area on the load in the positive load regime before significant wear occurs, as inferred from sliding friction measurements. This implies that the average pressure, and thus the average bond formation rate, is load independent within the accessible load range. We also consider a more accurate nonlinear model for the contact area, from which we extract the activation volume and the average stress-free energy barrier to the aging process. Our work provides an approach for studying the load and time dependence of contact aging at the nanoscale and further establishes RSF laws for nanoscale asperity contacts.

关键词： Chemical bonding Friction Atomic force microscopy

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