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Robust interface-induced unusual anomalous Hall effect in Mn_(3)Sn/Pt bilayers

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Rare Metals 2022年第9期41卷 3012-3018页

作者： Jun-Jie Liu Kang-Kang Meng Ji-Kun Chen Yong Wu Jun Miao Xiao-Guang Xu Yong Jiang School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China

Interface-driven magnetic phenomena related to spin-orbit coupling and intrinsic symmetry breaking are of great significance to the development of spintronics materials and devices.Mn_(3)Sn is a natural antiferromagnetic material with a non-collinear magnetic structure,and its anomalous Hall effect(AHE)has been reported to have high crystal anisotropy and temperature dependent behaviors.Here,a large unusual anomalous Hall effect(UAHE)in the(0001)c-axis orientation Mn_(3)Sn/Pt bilayers in the whole temperature range from 5 to 300 K is reported,which is absent in single MnSn film.

关键词： film. unusual effect

Two-step solvent post-treatment on PTAA for highly efficient and stable inverted perovskite solar cells

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Photonics Research 2020年第10期8卷 I0002-I0012页

作者： YANG LI CHAO LIANG GAOPENG WANG JIELEI LI SHI CHEN SHIHE YANG CUICHUANG XING HUI PAN Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao SAR999078China Guangdong Key Laboratory of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of MacaoMacao SAR999078China

Modifying the surface of poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA)with toluene during the high-speed spin-coating process of dimethylformamide considerably improves the wettability and morphology of PTAA and results in improvement of the crystallinity and absorption of perovskite film.The hole mobility and ohm contact have also been improved accordingly.Combined with these improved parameters,inverted perovskite solar cells with high efficiency of 19.13%and long-term stability could be achieved,which are much better than those with untreated PTAA.Importantly,our devices can keep 88.4%of the initial power conversion efficicncy after 30 days of storage in ambient air.

关键词： film. perovskite ambient

An Origin of Dzyaloshinskii–Moriya Interaction at Graphene-Ferromagnet Interfaces Due to the Intralayer RKKY/BR Interaction

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Chinese Physics Letters 2020年第8期37卷 130-135页

作者：杨锦李健林亮中朱家骥 School of Science and Laboratory of Quantum Information Technology Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Information Engineering Zhongshan PolytechnicZhongshan 528400China

We present a theory of both the itinerant carrier-mediated RKKY interaction and the virtual excitations-mediated Bloembergen–Rowland(BR)interaction between magnetic moments in graphene induced by proximity effect with a ferromagnetic film.It is shown that the RKKY/BR interaction consists of the Heisenberg,Ising,and Dzyaloshinskii–Moriya(DM)terms.In the case of the nearest distance,we estimate the DM term from the RKKY/BR interaction is about$0.13$meV for the graphene/Co interface,which is consistent with the experimental result of DM interaction$0.16\pm0.05$meV.Our calculations indicate that the intralayer RKKY/BR interaction may be a possible physical origin of the DM interaction in the graphene-ferromagnet interface.This work provides a new perspective to comprehend the DM interaction in graphene/ferromagnet systems.

关键词： film. interaction RKKY

Gate Tunable Supercurrent in Josephson Junctions Based on Bi_(2)Te_(3) Topological Insulator Thin film.

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Chinese Physics Letters 2021年第3期38卷 89-94页

作者：吴伟雄冯洋白云鹤姜钰莹高宗伟李远昭栾建立周恒安江万军冯硝张金松张浩何珂马旭村薛其坤王亚愚 State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200438China Frontier Science Center for Quantum Information Beijing 100084China Beijing Academy for Quantum Information Sciences Beijing 100084China

We report transport measurements on Josephson junctions consisting of Bi_(2)Te_(3) topological insulator(TI)thin film. contacted by superconducting Nb electrodes.For a device with junction length L=134 nm,the critical supercurrent Ic can be modulated by an electrical gate which tunes the carrier type and density of the TI film.Ic can reach a minimum when the TI is near the charge neutrality regime with the Fermi energy lying close to the Dirac point of the surface state.In the p-type regime the Josephson current can be well described by a short ballistic junction model.In the n-type regime the junction is ballistic at 0.7 K

关键词： state. film. Josephson

Tuning of the Magnetic Damping Parameter by Varying Cr Composition in Fe1-xCrx Alloy

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Chinese Physics Letters 2020年第10期37卷 92-97页

作者：杨茂陆显扬刘波阮学忠张军然张晓倩黄大威吴竞杜军刘波孟皓何亮徐永兵 Jiangsu Provincial Key Laboratory of Nanotechnology School of Electronics Science and EngineeringNanjing UniversityNanjing 210093China College of Physics and Electronic Information Luoyang Normal UniversityLuoyang 471022China York-Nanjing International Joint Center in Spintronics Departments of Electronics and PhysicsUniversity of YorkYork YO105DDUK Department of Physics Nanjing UniversityNanjing 210093China Key Laboratory of Spintronics Materials Devices and Systems of Zhejiang Province9 Lixin RoadLinanHangzhou 311300China

We investigate the magnetic damping parameter of Fe 1−x Cr x thin film. using the time-resolved magneto-optical Kerr effect technique.It is demonstrated that the overall effective damping parameter is enhanced with the increasing Cr concentration.The effective damping at high fieldα0 is found to be significantly enhanced when increasing the Cr concentration with theα0=0.159 in the Fe 45 Cr 55 enhanced by 562%compared with that ofα0=0.024 in the pure Fe film.This study provides a new approach of controlling the effective damping parameter with a desired magnitude via varying Cr composition.

关键词： technique. film. concentration.

Improving Both Electron and Hole Mobilities of an Ambipolar Polymer by Integrating Sodium Sulfonate-Tethered Alkyl Side Chains

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Chinese Journal of Chemistry 2020年第12期38卷 1663-1670页

作者： Li-Na Liu Yun-Peng Li Maria Khalil Zi-Wen Xu Guanghui Xie Xingmin Zhang Jingjing Li Wei-Shi Li Key Laborstory of Synthetic and Self-assembly Chemistry for Orgonic Functional Molecules Center for Excellence in Molecular Synthesisshanghailnsti-tute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Acodemy of sciences345 Lingling RoodSshanghai 200032China Engineering Research Center of henghou for High Performance Organic Functional Moterials Zhengzhou Institute of Technology6 Yingcai treetHuiji DistrictZhengzhouHenan 450044China Shanghai ynchrotron Radiation Facility Shanghai Advanced Research insituteChinese Acodemy of Sciences239 Zhangheng RoadPudong DistricShanghai 201204China

of main observation and conclusion High performance ambipolar organic semiconductors are highly desirable for organic logic circuits.Herein,we demonstrate the integration of sodium sulfonate(SS)-tethered sidechains into a diketopyrrolopyrrole-based ambipolar polymer(PDPP3T)can simultaneously improve its hole and electron transport performances either parallel or perpendicular to polymer film.Three SS-functionalized polymers(PDPP3T-XSS,x=0.025,0.05 and 0.10)were synthesized and studied.It was found that SS functionalization can reinforce interchain n-Ti interactions,slightly lower frontier orbital energy levels,produce more rod-like structures in film.and change chain-packing from edge-on to face-on fashion,but has little influence on thermal properties.More interestingly,organic field-effect transistors reported hole mobility of 0.27±0.066 cm^2.V^-1·s^-1 and electron mobility of 0.038±0.016 cm^2.V^-1·s^-1 for PDPP3T,while increased 2.4 and 5 folds to 0.64±0.087 and 0.19±0.051 cm^2.V^-1·s^-1 for PDPP3T-0.025SS,respectively.Moreover,PDPP3T-xSS devices displayed reduced threshold voltages for both hole and electron transports.Meanwhile,space charge-limited current method found SS functionalization achieved an order of magnitude increase in electron mobility and slight enhancement in hole mobility transporting perpendicular to polymer film.In-depth investigations suggest such enhancements may originate from the joint actions of chain-stacking modulation and ionic doping effect.

关键词： properties. effect. film.

Characterization of ZnO:Al film. deposited by r.f. magnetron-sputtering at low temperature

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Science China Mathematics 2002年第3期45卷 394-399页

作者：郝晓涛马瑾马洪磊田茂华曹宝成叶丽娜程传福滕树云 Institute of Optoelectric Materials and Devices Shandong University Jinan 250100 China

Transparent conducting ZnO:AI thin film. with good adhesion and Iow resistivity have been prepared on organic substrates and Coming 7059 glass substrates by r.f. magnetron-sputtering technique at Iow substrate temperature (25-210℃). Structural and photoelectric properties of the deposited film. are investigated. The deposited film. are polycrystalline with hexagonal structure and a preferred orientation with the c-axis perpendicular to the substrate. Only the (002) peak is observed.High quality film. with resistivity as Iow as 1.0 x 10- 3Ω@ cm and 8.4 x 10- 4Ω@ cm, the average transmittance over 74% and 85% in the wavelength range of the visible spectrum have been obtained on different substrates.

关键词： organic substrate, aluminum doped zinc oxide film. transparent conductive film.

Dynamic wetting and stress singularity on contact line

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Science China(Technological Sciences) 2003年第4期46卷 407-417页

作者：王晓东彭晓峰李笃中 Department of Thermal Engineering Tsinghua University Department of Chemical Engineering Taiwan University

A theoretical investigation is conducted to understand the contact line movement and associated contact angle phenomena. Contact line is supposed to move on a thin precursor film. and contact line has a velocity and is subject to viscous stress on the film.or geometrically on the solid surface. With the introduction of a characteristic parameter, l′, the movement of contact line and contact angle phenomena are very well described in both physics and mathematics. The viscous shearing stress exerted by liquid on solid surface was derived, and the behavior of dynamic contact angle was recognized on rough solid surfaces. The analyses indicate that characteristic parameter l′ is dependent upon solid wall intrinsic property and mechanical performance, and is irrelevant to liquid property. Theoretical predictions are in good agreement with available experimental data in literature.

关键词： dynamic contact angle, stress singularity, characteristic parameter, precursor film.

Synthesis of New Multibranch Chromophores with Strong Light-emitting in Solution and in PMMA film

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Chinese Chemical Letters 2003年第11期14卷 1135-1138页

作者： XiaoMeiWANG TianSheYANG PingYANG QinFenSHI WanLiJANG HongDeXIE CollegeofMiaterialScienceandEngineering SoochowUniversitySuzhou215021 DepartmentofChemistry SoochowUniversitySuzhou215021 StateKeyLaboratoryofCrystalMaterials ShandongUniversityJinan250100

Three new chromophores with triphenylamine as molecular focal point bearing one, two, or three 4-(n-butyloxystyryl) group(s) at the periphery respectively, (named as T1, T2, and T3) have been synthesized and characterized. It is interesting to find that the fluorescence quantum yield increases from T1 (0.489), to T3 (0.535), and to T2 (0.628) in cyclohexane, meanwhile the lifetime for T3 is shorter than T1 and T2, which is an important characteristic for applications in light emitting diode. Also PMMA (polymethyl methacrylate) film.doped with T3 gives stronger fluorescence than T1, and T2. Cyclic voltammetry showed that T3 exhibited lowest oxidation potential of 0.52 V vs SCE, suggesting its better hole-transport property.

关键词： Trans-4-(4'-n-butyloxy-styryl) triphenylamine trans-4,4- di (4'-n- butyloxy- styryl)- triphenylamine trans-4,4,4-tris(4'-n-butyloxystyryl)triphenylamine photo- luminescence film.