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Low Gilbert damping in Bi/In-doped YIG thin films with giant Faraday effect

Chinese Physics B 2024年第10期33卷 419-426页

作者： Jin Zhan Yi Wang Xianjie Wang Hanxu Zhang Senyin Zhu Lingli Zhang Lingling Tao Yu Sui Wenqing He Caihua Wan Xiufeng Han V.I.Belotelov Bo Song School of Physics Harbin Institute of TechnologyHarbin 150001China Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Russian Quantum Center Moscow 119991Russia National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450046China Frontiers Science Center for Matter Behave in Space Environment Harbin Institute of TechnologyHarbin 150001China

Magnetic films with low Gilbert damping are crucial for magnonic devices,which provide a promising platform forrealizing ultralow-energy *** this study,low Gilbert damping and coercive field were observed in Bi/In-dopedyttrium iron garnet(BiIn:YIG)thin *** BiIn:YIG(444)films were deposited onto different substrates using pulsedlaser *** coercivity(<1 Oe)with saturation magnetization of 125.09 emu/cc was achieved along the in-planedirection of BiIn:YIG *** values of Gilbert damping and inhomogeneous broadening of ferromagnetic resonance inBiIn:YIG films were obtained to be as low as 4.05×10^(-4)and 5.62 Oe,*** addition to low damping,the giantFaraday rotation angles(up to 2.9×10^(4)deg/cm)were also observed in the BiIn:YIG *** modifying the magneticstructure and coupling effect between Bi^(3+)and Fe^(3+)of Bi:YIG,doped In^(3+)plays a key role on variation of the *** low damping and giant Faraday effect made the BiIn:YIG film an appealing candidate for magnonic andmagneto-optical devices.

关键词： magnonic device Gilbert damping Faraday effect

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Selective thermal emission and infrared camouflage based on layered media

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Chinese Journal of Aeronautics 2023年第3期36卷 212-219页

作者： Qingxiang JI Xueyan CHEN Vincent LAUDE Jun LIANG Guodong FANG Changguo WANG Rasoul ALAEE Muamer KADIC National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Institute FEMTO-ST CNRSUniversity Bourgogne Franche-Comte´Besanc¸on 25000France Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Department of Physics University of OttawaOttawaK1N 6N5Canada Institute of Theoretical Solid State Physics Karlsruhe Institute of TechnologyKarlsruhe D-76131Germany

Infrared camouflage based on artificial thermal metasurfaces has recently attracted significant *** eliminating thermal radiation differences between the object and the background,it is possible to hide a given object from infrared *** camouflage is an important element that increases the survivability of aircraft and missiles,by reducing target susceptibility to infrared guided ***,a simple and practicable design is theoretically presented based on a multilayer film for infrared stealth,with distinctive advantages of scalability,flexible fabrication,and structural *** multilayer medium consists of silicon substrate,carbon layer and zinc sulfide film,the optical properties of which are determined by transfer matrix *** locally changing the thickness of the coating film,the spatial tunability and continuity in thermal emission are demonstrated.A continuous change of emissive power is further obtained and consequently implemented to achieve thermal camouflage *** addition,other functionalities,like thermal illusion and thermal coding,are demonstrated by thickness-engineered multilayer films.

关键词： Heat transfer manipulation Infrared camouflage Multilayer media Selective thermal emission Thermal illusion Transfer matrix method

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MECHANICAL PROPERTIES OF NON-CRIMP FABRIC REINFORCED QUASI-ISOTROPIC LAMINATE LOADED IN BIAXIAL TENSION-COMPRESSION

MECHANICAL PROPERTIES OF NON-CRIMP FABRIC REINFORCED QUASI-I...

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第二十一届国际复合材料大会

作者： Songhe Meng Leying Song Chenghai Xu Xinxing Han Wei Wang Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology

The non-crimp fabric reinforced quasi-isotropic composite finds fast growing application in primary structures for its excellent performance at low production costs. The non-crimp fabric prepreg shows significantly better mechanical properties along the fiber direction than the woven counterpart, due to practically straight fibers. It can be further designed into the non-crimp fabric reinforced quasiisotropic composite with good multi-directional in-plane properties. However, the detailed understanding of mechanical behaviors for this kind of composite should be described by experimental study, before it is efficiently used in design and the predictive models are developed. This paper will focus on the mechanical performance of the non-crimp fabric quasi-isotropic laminate under uniaxial tension, uniaxial compression and especially biaxial tension-compression with three different load ratios, which is defined as the ratio of tensile to compressive. Typical stress-strain curves with 1:1 load ratio, as shown in Fig. 1(a), exhibit near linear responses at the initial stage of load, followed by a sharp drop in stress along the compressive direction. It can be observed that the catastrophic failure occurs in compressive direction while the potential ability to withstand the continued tensile stress is also available in tensile direction. The corresponding curves under 3:1 load ratio are shown in Fig.1(b). Two curves present the linear trend at the early stage of load and exhibit sharp drop in stress simultaneously when the final failure occurs. The adopted one-way analysis of variance method indicates load ratio has a significant effect on tensile strength, but has relatively less significant effect on tensile modulus, compressive modulus and compressive strength. The failure analysis with the examinations on the fracture surface is also available to explain the failure modes.

关键词： Non-crimp fabric Biaxial tension-compression Failure analysis Variance analysis

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VOID FORMATION AND DISTRIBUTION DURING CFRP CURING PROCESS

VOID FORMATION AND DISTRIBUTION DURING CFRP CURING PROCESS

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第二十一届国际复合材料大会

作者： Dongkangkang Chen Yumin Zhang Yufeng Zhou Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology

＜正＞1 INTRODUCTION The excellent properties in carbon fiber reinforced polymer composite make it receive widespread attention in the field of large aircraft design and manufacture[1-2].The application of CFRP composites also play a key role in the constitution of aerospace plane and its components[3].However,due to the structure and the organization form principle of the composite component,defects such as

关键词： CFRP porosity curing reaction distribution characters industrial CT

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Unified throughout-pore microstructure enables ultrahigh separator porosity for robust high-flux lithium batteries

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Electron 2023年第1期1卷 37-49页

作者： Dongjiang Chen Yuanpeng Liu Chao Feng Yuhui He Shengyu Zhou Botao Yuan Yunfa Dong Haodong Xie Guangfeng Zeng Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina Center for Composite Materials and Structures Harbin Institute of TechnologyHarbinChina State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of ChinaChengduChina Chongqing Research Institute Harbin Institute of TechnologyChongqingChina Interdisciplinary Graduate Program in Materials Science Vanderbilt UniversityNashvilleTennesseeUSA

With small thickness,commercial polyolefin separators own low porosity to ensure sufficient thermomechanical properties,resulting in tortuous and enlarged Li+diffusion pathways that induce large overpotentials and detrimental dendrite *** a dilemma,the exploration of highly porous separators has been challenged by their large thickness,impairing the applicability of such ***,an ultraporous architecture is designed to shorten Li+transfer pathways by impregnating electrolyteaffinitive poly(vinylidene fluoride-co-hexafluoropropylene)into ultralight~3μm 3D-polytetrafluoroethylene scaffold(abbreviated as UP3D).The UP3D separator with a porosity of 74%gives rise to 70%enhancement in Li+transference and 77%reduction in Li+transfer resistance(2.67 mΩmm^(−1))and thus enables an ultrahigh Li+flux of 22.7 mA cm^(−2),effectively alleviating Li+concentration gradient across the *** the separator,the LiFePO4 half cell delivers a capacity of 118 mAh g^(−1) with an unparalleled capacity retention of 90%after 1000 cycles at 2 C,and a graphite||LiNi_(0.6)Co_(0.2)Mn_(0.2)O_(2)pouch full cell delivers an areal energy density of 6.8 mWh cm^(−2)at 8.848 mA(1.4 mA cm^(−2))with a high cathode loading of 134.9 *** results,together with the scalable production of the separator,reflect its promising potential in high-flux battery applications of separators that require both ultrahigh porosity and reliability.

关键词： Li deposition Li-ion batteries polytetrafluoroethylene separator ultrahigh porosity

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Super broadband absorbing hierarchical CoFe alloy/porous carbon@carbon nanotubes nanocomposites derived from metal-organic frameworks

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Journal of Materials science & technology 2022年第23期118卷 218-228页

作者： Siyao Guo Yunfeng Bao Ying Li Hailong Guan Dongyi Lei Tiejun Zhao Baomin Zhong Zhihong Li School of Civil Engineering Qingdao University of TechnologyQingdao 266033China Postdoctoral Workstation Guangdong Dongpeng Holding Company LimitedGuangdong 528031China Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao University of TechnologyQingdao 266033China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in special Environments Harbin Institute of TechnologyHarbin 150080China

The exploitation of electromagnetic wave absorption(EMA) materials has attracted ever-increasing attention,not only because electromagnetic wave(EMW) originated from overuse of electronic products has threatened human' health seriously,but also because EMA materials can effectively protect radar stealth from being ***,it is still a challenge to obtain broadband and efficient EMA materials to satisfy practical *** this work,we developed a series of hierarchical CoFe alloy/porous carbon@carbon nanotubes(CoFe/PC@CNTs) nanocomposites through revising the proportion of Fe^(2+) in the metal-organic frameworks(MOFs)(CoFe-ZIF) precursor and one-step simple pyrolysis *** cross deposition between CoFe alloy,carbon nanotubes(CNTs),and porous carbon(PC) formed a double conductive network,favoring for achieving excellent EMA ***,when the filler mass ratio is only 10 wt%,the optimized CoFe/PC@CNTs nanocomposites display the best EMA capability,whose minimum reflection loss(RL_(min)) value is-68.94 dB at 13.69 GHz and the effective absorption band(EAB,<-10 dB) reaches up 9.14 GHz with a matching thickness of 2.63 *** addition,the largest EAB can achieve up to 11 GHz(3.35-14.35 GHz) during all matching *** splendid EMA performance benefits the favorable dielectric loss provided by the double conductive network,the good magnetic loss benefited from the evenly distributed CoFe alloy,the excellent impedance matching,rich transmission paths,and multiple ***,such EMA materials with super broadband absorbing provide desirable candidates for lightweight and high-efficient microwave absorbers.

关键词： Electromagnetic wave absorption CoFe alloy/porous carbon@carbon nanotubes nanocomposites Broadband absorbing Metal-organic frameworks

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Observation of Enhanced Faraday Effect in Eu-Doped Ce:YIG Thin Films

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Chinese Physics Letters 2023年第12期40卷 155-159页

作者：张晗旭朱森寅湛劲王先杰王一姚泰 N.I.Mezin 宋波 School of Physics Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China A.A.Galkin Donetsk Institute for Physics and Engineering Rosa Luxemburg Str.7283114 DonetskUkraine Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450046China Frontiers Science Center for Matter Behave in Space Environment Harbin Institute of TechnologyHarbin 150001China

Ce:YIG thin films are taken as an ideal candidate for magneto-optical devices with giant Faraday effect in the near-infrared range,but it is hindered by a limited Ce^(3+)/Ce^(4+)ratio and a high saturation driving *** address this issue,Eu doping can increase the Faraday rotation angle by ~40% to 1.315×10^(4)deg/cm and decrease the saturation driving field by ~38%to 1.17 kOe in Eu_(0.75)Ce_(1)Y_(1.25)Fe_(5)O_(12 )compared to Ce_(1)Y_(2)Fe_(5)O_(12)*** mechanism is attributed to the conversion of Ce^(4+)to Ce^(3+)and the weakening of ferrimagnetism by Eu *** work not only provides strategies for improving Ce^(3+)/Ce^(4+) ratio in Ce:YIG,but also develops(Eu,Ce):YIG with a promising Faraday rotation angle for magneto-optical devices.

关键词： Faraday field YIG

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Effects of graphene mass fraction and aspect ratio on elastic properties of Graphene-based composites

Effects of graphene mass fraction and aspect ratio on elasti...

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第二十一届国际复合材料大会

作者： Zhenmeng Xia Changguo Wang Huifeng Tan Center for Composite Materials Harbin Institute of Technology National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology

Graphene-based nanocomposites have attracted tremendous research interest over the past decade due to their unique mechanical, thermal, electronic, and chemical properties and excellent properties of graphene as the reinforcement play an important role in these ***, this paper presents an equivalent discrete continuum model to accurately predict the elastic properties of graphene, including the Young’s modulus and Poisson’s ratio.A pseudo-beam with modified internal bending moment and variable stiffness is used to represent the C-C bond, as shown in *** calculating the deformation strain energies of unit cell, the parameter equivalence relationships between C-C bond and pseudo-beam are ***, the discrete continuum model is deduced based on the above pseudo-beam model combining Castigliano second *** choosing the appropriate force constants,the Young’s modulus and Poisson’s ratio of graphene are calculated compared with the open literatures, which verifies the availability and accuracy of the discrete continuum model, as shown in ***, considering that graphene is regarded as a rectangular inclusion, the averaged Eshelby’s tensor for a rectangular shape in different aspect ratios is obtained, which parameters can be determined by the properties of graphene predicted by the above ***, the elastic properties are predicted based on the Mori–Tanaka micro-mechanics *** effects of aspect ratio and mass fraction of graphene on the elastic properties of Graphene-based nanocomposites are *** results are as shown in *** work can guide the designer to accurately evaluate the elastic properties of Graphene-based nanocomposites for further applications.

关键词： Pseudo-beam model Mori–Tanaka method Elastic properties Graphene-based composites

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Graphene oxide enabled polymeric shape memory composites for enhanced electro-actuation

Graphene oxide enabled polymeric shape memory composites for...

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作者： Lu, Haibao Liang, Fei Zhu, Shipeng Yang, Yunhua Yao, Yongtao Fu, Y.Q. Science and Technology on Advanced Composites in Special Environments Laboratory Harbin Institute of Technology Harbin China Composite Materials and Structures Laboratory Department of Mechanical Materials and Aerospace Engineering University of Central Florida OrlandoFL United States Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing China Department of Physics and Electrical Engineering Faculty of Engineering and Environment University of Northumbria Newcastle-Upon-Tyne United Kingdom

An effective approach to improve the electrical properties and electro-activated performance of shape memory polymer (SMP) nanocomposites has been demonstrated via a synergistic effect from carbon fibre and self-assembled graphene oxide (GO). The surface modified GO has been grafted onto carbon fibre to enhance the interfacial strength with SMP matrix through van-der-Waals bonds and covalent crosslinking. Carbon fibre enhances the performance of electrical actuation of SMP through Joule heating. Furthermore, the temperature distribution within the SMP nanocomposite during Joule heating becomes uniform, resulting in a significant enhancement of shape recovery and electro-actuation performance of high recovery speed. Copyright © 2015 American Scientific Publishers All rights reserved.

关键词： Graphene

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Far-infrared transparent conductors

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Light(science & Applications) 2023年第6期12卷 982-993页

作者： Chaoquan Hu Zijian Zhou Xiaoyu Zhang Kaiyu Guo Can Cui Yuankai Li Zhiqing Gu Wei Zhang Liang Shen Jiaqi Zhu State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of Ministry of EducationSchool of Materials Science and EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012China College of Information Science and Engineering Jiaxing UniversityJiaxing 314001China Electron Microscopy Center Jilin UniversityChangchun 130012China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringInternational Center of Future ScienceJilin UniversityChangchun 130012China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China

The long-standing challenge in designing far-infrared transparent conductors(FIRTC)is the combination of high plasma absorption edge(λ_(p))and high conductivity(σ).These competing requirements are commonly met by tuning carrier concentration or/and effective carrier mass in a metal oxide/oxonate with low optical dielectric constant(ε_(opt)=2-7).However,despite the highσ,the transparent band is limited to mid-infrared(λ_(p)<5μm).In this paper,we break the trade-off between highσandλ_(p)by increasing the“so-called constant”ε_(opt)that has been neglected,and successfully develop the material family of FIRTC withε_(opt)>15 andλ_(p)>15μ*** FIRTC crystals are mainly octahedrally-coordinated heavy-metal chalcogenides and their solid solutions with shallow-level *** highε_(opt)relies on the formation of electron-deficiency multicenter bonds resulting in the great electron-polarization *** new FIRTC enables us to develop the first“continuous film”type far-infrared electromagnetic shielder that is unattainable using traditional ***,this study may inaugurate a new era in far-infrared optoelectronics.

关键词： transparent neglected enable

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