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Vortex Pinning due to Dynamic Spin-Vortex Interaction in a Superconductor//Ferromagnet Multilayer

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Chinese physics Letters 2009年第1期26卷 310-313页

作者：吴鸿业邹涛成昭华孙阳 State Key laboratory of Magnetism and Beijing National laboratory for Condensed Matter physics Institute of Physics Chinese Academy of Sciences Beijing 100190

We investigate the mutual interaction between superconductivity and ferromagnetism in a Nb/Ni81 Ee19 multilayer by ac susceptibility measurements. Compared with a pure superconducting Nb film, the critical current density of the multilayer is apparently enhanced in a low magnetic field region but remains nearly the same in high magnetic fields, which indicates that a continuous ferromagnetic layer with in-plane magnetization can produce strong vortex pinning in a low field region. We interpret this unusual vortex-pinning phenomenon as a consequence of dynamic spin vortex interaction which induces a spin rotation following vortex movement. In addition, we propose that this dynamic interaction could be used for spin manipulation via a superconductor.

关键词： SUPERCONDUCTORS FERROMAGNETISM MULTILAYERED thin films SUPERCONDUCTIVITY MAGNETIC fields MAGNETIZATION

Highly coupled off-resonance lattice design in diffraction-limited light sources

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nuclear Science and Techniques 2024年第09期 224-234页

作者： Yi-Hao Gong Shun-Qiang Tian Xin-Zhong Liu Shou-Zhi Xuan Li-Yuan Tan Ling-Long Mao Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai Shanghai Institute of Applied physics Chinese Academy of Sciences Shanghai University of Chinese Academy of Sciences

The round-beam operation presents many benefits for scientific experiments regarding synchrotron radiation and the weakening influences of intra-beam scattering in diffraction-limited synchrotron light sources. A round-beam generation method based on the global setting of skew quadrupoles and the application of a non-dominated sorting genetic algorithm was proposed in this study. Two schemes, including large-emittance coupling introduced via betatron coupling and vertical dispersion, were explored in a candidate lattice for an upgrade-proposal of the Shanghai synchrotron radiation facility. Emittance variations with lattice imperfections and their influence on the beam dynamics of beam optic distortions were *** results demonstrated that a precise coupling control ranging from 10 to 100% was achieved under low optical distortion,whereas full-coupling generation and its robustness were achieved by our proposed method by adjusting the skew quadrupole components located in the dispersion-free sections. The Touschek lifetime increased by a factor of 2–2.5.

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Effect of Electric Potentials on Microstructure, Corrosion and Wear Characteristic of the Nitrided Layer Prepared on 2Cr13 Stainless Steel by Plasma Nitriding

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 733-745页

作者： Yang Li Shang-Zhou Zhang Jian-Xun Qiu Yong-Yong He Jun-Jie Xiu Qian-Wen Ye Zhong-Li Liu School of nuclear equipment and nuclear engineering Yantai University.Yantai 264005China State Key laboratory of Tribology Tsinghua UniversityBeijing 100084China

Plasma nitriding is a widely used technology to enhance the surface performance and extend the service life of alloy *** current research mainly focuses on the influences of time,temperature,gas type and pressure parameters on nitriding behavior,while fewer studies have been conducted on the electric *** paper mainly reports the effect of the electric potential on nitriding *** conditions were set using cathodic,anodic and floating potentials in a plasma nitriding furnace.2Cr13 stainless steel was nitrided at 450°C for 5h in an NH3 *** experimental results show that the nitriding treatment can be well performed under the different electric potentials,but differences exist in microstructures,morphologies and performance results of the modified *** thickness and hardness values of the nitrided layer are ranked as follows:cathodic[anodic[floating *** anodic nitrided surface has an obvious particle deposition layer composed of nitrides and *** and tribological experiments show that the corrosion resistance and wear resistance were significantly improved after a nitriding treatment using the three electric ***,the floating nitriding treatment resulted in the best tribological performance and corrosion resistance.

关键词： Nitriding Stainless steel Wear Corrosion

Spectroscopic investigation of defects mediated oxidization of single-layer MoS_(2)

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Science China(Technological Sciences) 2021年第3期64卷 611-619页

作者： HE ZuYun GUO Zheng ZHONG Xiao CHEN XiaoFei XUE JianMing WANG XinWei CHEN Yan School of Environment and Energy South China University of TechnologyGuangzhou 510006China School of Advanced Materials Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China State Key laboratory of nuclear physics and Technology School of PhysicsPeking UniversityBeijing 100871China

Due to the extremely large surface to bulk ratio,the properties of single layer(SL)MoS_(2)are largely determined by its interaction with *** critical interaction process that has been intensively investigated is the oxidation process of MoS_(2).Despite numerous previous explorations,the detailed mechanism regarding how MoS_(2)reacts with oxygen is still not well *** this work,we systematically investigate the impact of intrinsic and pre-created defects on the oxidation process of SL MoS_(2).For pristine SL MoS_(2),the oxidation is found to initiate near point defects and grain boundaries,leading to the formation of triangle pits in the basal plane and cracks near the grain *** pre-created defects introduced by ion irradiation are found to serve as the oxidation center,resulting in a more uniform oxidation *** oxidation is found to introduce p-type doping in the SL MoS_(2),leading to the blue shift of Raman and photoluminescence(PL)*** shift is found to be more for the region near the grain boundary and for the samples with more pre-created *** results suggest that the presence of defects can strongly promote the oxidation reaction of SL MoS_(2)in ambient condition,which significantly affects the stability and functionality of materials.

关键词： single layer MoS_(2) oxidation defect

Improving hydrogen evolution reaction efficiency through lattice tuning

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Nano Research 2024年第7期17卷 5907-5913页

作者： Zipeng Zhao Haotian Liu Wenpei Gao Praveen Kolla Wang Xue Zeyan Liu Jinghua Guo Sanjeev Mukerjee Xiaoqing Pan Qingying Jia Xiangfeng Duan Yu Huang Department of Materials Science and Engineering University of CaliforniaLos AngelesCalifornia 90095USA Department of Chemical Engineering and Materials Science University of CaliforniaIrvineCalifornia 92697USA Materials Science and Engineering North Carolina State UniversityRaleighNorth Carolina 27695USA Department of Chemistry and Chemical Biology Northeastern UniversityBostonMassachusetts 02115USA Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCalifornia 90095USA Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCalifornia 95064USA Department of physics and Astronomy University of CaliforniaIrvineCalifornia 92697USA California Nanosystems Institute University of CaliforniaLos AngelesCalifornia 90095USA

The intermittent nature of renewable energy sources sets a requirement for efficient energy storage to mitigate the conflict between energy supply and *** is a promising choice for energy storage due to its high energy ***,the conversion of electrical energy to chemical energy stored in hydrogen through water electrolysis suffers from low efficiency,and the electricity cost dominates the total cost of hydrogen ***,we report the study of improving the hydrogen evolution reaction activity of Pt-based catalysts by building a nanoscale surface NiO and Pt interface,further optimizing the performance via tuning the lattice parameter of the core of nanoparticles,which can be achieved by varying the dealloying annealing *** optimized PtCuNi-O/C and PtNi-O/C catalysts are demonstrated to be one of the best catalysts,with a mass activity(MA)of 9.1 and 8.7 mA/μgPt,which is 9.9-fold and 9.5-fold of that of Pt/C,respectively.

关键词： lattice tuning Pt-based catalyst hydrogen evolution reaction electrocatalysis

Off-axis electron holography of manganite-based heterojunctions:Interface potential and charge distribution

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Chinese physics B 2019年第4期28卷 269-274页

作者： Zhi-Bin Ling Gui-Ju Liu Cheng-Peng Yang Wen-Shuang Liang Yi-Qian Wang College of physics & State Key laboratory Qingdao University

The interfacial electrical potentials and charge distributions of two manganite-based heterojunctions, i.e.,La_(0.67)Ca_(0.33)MnO_3/SrTiO_3:0.05 wt% Nb(LCMO/STON) and La_(0.67)Ca_(0.33)MnO_3/LaMnO_3/SrTiO_3:0.05 wt% Nb(simplified as LCMO/LMO/STON), are studied by means of off-axis electron holography in a transmission electron *** influences of buffer layer on the microstructure and magnetic properties of the LCMO films are explored. The results show that when a buffer layer of LaMnO_3 is introduced, the tensile strain between the STON substrate and LCMO film reduces, misfit dislocation density decreases near the interfaces of the heterojunctions, and a positive magnetoresistance is observed. For the LCMO/STON junction, positive and negative charges accumulate near the interface between the substrate and the film. For the LCMO/LMO/STON junction, a complex charge distribution takes place across the interface, where notable negative charges accumulate. The difference between the charge distributions near the interface may shed light on the observed generation of positive magnetoresistance in the junction with a buffer layer.

关键词： La0.67Ca0.33MnO3 films electron holography magnetic properties interfacial electrical potential charge distribution

Implementation of LDA+ Gutzwiller with Newton's method

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Chinese physics B 2017年第1期26卷 391-398页

作者： Jian Zhang Ming-Feng Tian Guang-Xi Jin Yuan-Feng Xu Xi Dai Beijing National laboratory for Condensed Matter physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China LCP Institute of Applied Physics and Computational Mathematics Beijing 100088 China CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China Institute of nuclear physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

In order to calculate the electronic structure of correlated materials, we propose implementation of the LDA＋Gutzwiller method with Newton＇s method. The self-consistence process, efficiency and convergence of calculation are improved dramatically by using Newton＇s method with golden section search and other improvement *** compare the calculated results by applying the previous linear mix method and Newton＇s method. We have applied our code to study the electronic structure of several typical strong correlated materials, including SrVO3, LaCoO3, and La2O3Fe2Se2. Our results fit quite well with the previous studies.

关键词： LDA+Gutzwiller strongly correlated electrons Newton's method

A review of ^(17)O isotopic labeling techniques for solid-state NMR structural studies of metal oxides in lithium-ion batteries

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Magnetic Resonance Letters 2024年第2期4卷 46-53页

作者： Xiaoli Xia Lei Zhu Weiping Tang Luming Peng Junchao Chen School of Chemistry and Chemical Engineering Shanghai Jiao Tong University800 Dongchuan RoadShanghai200240China Key laboratory of Mesoscopic Chemistry of Ministry of Education and Collaborative Innovation Center of Chemistry for Life Sciences School of Chemistry and Chemical EngineeringNanjing University163 Xianlin RoadNanjing210023China State Key laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai200245China

Recent advances in utilizing ^(17)O isotopic labeling methods for solid-state nuclear magnetic resonance(NMR)investigations of metal oxides for lithium-ion batteries have yielded extensive insights into their structural and dynamic ***,we commence with a brief introduction to recent research on lithium-ion battery oxide materials studied using ^(17)O solid-state NMR *** we delve into a review of ^(17)O isotopic labeling methods for tagging oxygen sites in both the bulk and surfaces of metal *** last,the unresolved problems and the future research directions for advancing the ^(17)O labeling technique are discussed.

关键词： ^(17)O solid-state NMR ^(17)O isotopic labeling methods Bulk and surfaces of metal oxides DFT calculation

Construction of Z-scheme Ag_3PO_4/Bi_2WO_6 composite with excellent visible-light photodegradation activity for removal of organic contaminants

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Chinese Journal of Catalysis 2017年第12期38卷 2021-2029页

作者： Zhongliao Wang Taiping Hu Kai Dai Jinfeng Zhang Changhao Liang College of physics and Electronic Information Anhui Key Laboratory of Energetic Materials Huaibei Normal University Huaibei 235000 Anhui China Key laboratory of Materials physics and Anhui Key laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 Anhui China

Ag3PO4has good potential for use in photocatalytic degradation of organic ***,the activity and stability of Ag3PO4is hard to sustain because of photocorrosion and the positive potential of the conduction band of *** this study,A composite consisting of Bi2WO6nanosheets and Ag3PO4was developed to curb recombination of charge carriers and enhance the activity and stability of the *** of a Ag3PO4/Bi2WO6composite was confirmed using X‐ray diffraction,energy‐dispersive X‐ray spectroscopy,and X‐ray photoelectron *** spectroscopy provided convincing evidence that compositing Bi2WO6with Ag3PO4effectively reduced photocorrosion of *** Ag3PO4/Bi2WO6composite gave a high photocatalytic performance in photodegradation of methylene blue.A degradation rate of0.61min?1was achieved;this is1.3and6.0times higher than those achieved using Ag3PO4(0.47min?1)and Bi2WO6(0.10min?1),*** species trapping experiments using the Ag3PO4/Bi2WO6composite showed that holes,?OH,and?O2?all played specific roles in the photodegradation *** photocatalytic mechanism was investigated and a Z‐scheme was proposed as a plausible mechanism.

关键词： Ag3PO4 Bi2WO6 Photocatalysis Z‐scheme Degradation Visible light