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Enhanced resonance frequency in Co2FeAl thin film with different thicknesses grown on flexible graphene substrate

Chinese physics B 2024年第3期33卷 618-622页

作者：周偲袁少康朱登玉白宇明王韬刘福福潘禄禄冯存芳张博涵何大平汪胜祥 Hubei Engineering and Technology Research Center for Functional Fiber Fabrication and Testing Wuhan Textile UniversityWuhan 430200China School of Electronic and Electrical Engineering Wuhan Textile UniversityWuhan 430200China School of Mathematical and Physical Sciences Wuhan Textile UniversityWuhan 430200China School of Integrated Circuits Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory for Magnetism and Magnetic Materials Ministry of EducationLanzhou UniversityLanzhou 730000China Beijing National Center for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan University of TechnologyWuhan 430070China

The flexible materials exhibit more favorable properties than most rigid substrates in flexibility,weight saving,mechanical reliability,and excellent environmental ***,flexible graphene film with unique mechanical properties was extensively explored in high frequency ***,we report the characteristics of structure and magnetic properties at high frequency of Co2FeAl thin film with different thicknesses grown on flexible graphene substrate at room *** exciting finding for the columnar structure of Co2FeAl thin film lays the foundation for excellent high frequency property of Co2FeAl/flexible graphene ***-plane magnetic anisotropy field varying with increasing thickness of Co2FeAl thin film can be obtained by measurement of ferromagnetic resonance,which can be ascribed to the enhancement of crystallinity and the increase of grain ***,the resonance frequency which can be achieved by the measurement of vector network analyzer with the microstrip method increases with increasing thickness of Co2FeAl thin ***,in our case with graphene film,the resonance magnetic field is quite stable though folded for twenty cycles,which demonstrates that good flexibility of graphene film and the stability of high frequency magnetic property of Co2FeAl thin film grown on flexible graphene *** results are promising for the design of microwave devices and wireless communication equipment.

关键词： enhanced resonance frequency magnetic resonance field flexible graphene substrate

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Compositional ordering driven morphotropic phase boundary in ferroelectric solid solutions

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Physical Review B 2024年第5期110卷 054102-054102页

作者： Yubai Shi Yifan Shan Hongyu Wu Zhicheng Zhong Run-Wei Li Ri He CAS Key Laboratory of Magnetic Materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology College of Materials Science and Opto-Electronic Technology Department of Physics Suzhou Institute for Advanced Research School of Future Technology

Ferroelectric solid solutions usually exhibit giant dielectric response and high piezoelectricity in the vicinity of the morphotropic phase boundary (MPB), where the structural phase transitions between the rhombohedral and the tetragonal phases as a result of the composition or strain variation. Here, we propose a compositional ordering driven MPB in the specified compositional solid solutions. By preforming machine-learning potential-based molecular dynamics simulations on lead zirconate titanate, we find a phase transition from the rhombohedral to tetragonal phase with the decrease of compositional ordering, leading to the MPB on temperature-ordering phase diagram. The compositional ordering driven MPB can enhance the piezoelectricity with a magnitude comparable to that at the composition driven MPB. Finally, we demonstrate that the mechanism of high piezoelectricity is polarization rotation driven by external field. This work provides an additional degree of freedom, compositional ordering, to design the high-performance piezoelectric materials.

关键词： Composition Ferroelectric phase transition Phase transitions by order Piezoelectricity Perovskites Piezoelectrics Solid solutions Density functional theory Machine learning Molecular dynamics

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Impact of yarn on a textile UHF RFID TAG

Impact of yarn on a textile UHF RFID TAG

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IEEE International Conference on RFID-technology and applications (RFID-TA)

作者： Raúl Fernández-García Marc Martínez-Estrada Jordi Bonache Albacete Ignacio Gil Chengyang Luo Department of Electronic Engineering Universitat Politècnica de Catalunya Terrassa Spain Department of Electronic Engineering Universitat Autònoma de Barcelona Bellaterra Spain Science and Technology on Reliability Physics and Application of Electronic Components Laboratory Guangzhou China

An embroidered textile UHF RFID is proposed and characterized. The TAGs are based on a ‘T-match’ structure embroidered on a polyester textile substrate with three different conductive yarns. The input impedance and read range performance has been experimentally measured. The results show that the lower the electrical resistance of the yarn, the greater the TAG read range, achieving up to 7.5 meters.

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A Single-Loop Narrow-Band Force Rebalance Control Method with Temperature Self-Compensation for a MEMS Gyroscope

A Single-Loop Narrow-Band Force Rebalance Control Method wit...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Chunhua He Yingyu Xu Heng Wu Qinwen Huang Qiancheng Zhao Guizhen Yan School of Computer Guangdong University of Technology China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory CEPREI China School of Automation Guangdong University of Technology China School of Integrated Circuits Peking University Beijing China National Key Lab of Micro/Nano Fabrication Technology Beijing China

ISBN: (数字)9798331508890

ISBN: (纸本)9798331508906

This paper presents a novel single-loop narrow-band force rebalance control method with temperature self-compensation for a MEMS gyroscope. The narrow-bandwidth force rebalance control for the sense mode is achieved using a simple bandpass filter (BPF) and without modulation or demodulation. The center frequency of the BPF is adjusted automatically to match the resonant frequency of the sense mode. Meanwhile, its gain is tuned based on the real-time quality factor of the sense mode. Experimental results demonstrate that the bias drift of the gyroscope with self-compensation is reduced from 1320 deg/h to 16 deg/h, while the scale factor drift is reduced from 0.616 mV/deg/s to 0.075 mV/deg/s.

关键词： Micromechanical devices Band-pass filters Temperature sensors Q-factor Force Resonant frequency Real-time systems Gyroscopes Temperature control Phase locked loops

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A 4-stage Low-Noise Amplifier with 1.52-1.67dB Noise Figure

A 4-stage Low-Noise Amplifier with 1.52-1.67dB Noise Figure

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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Feng-yuan Mao Bin Li Zhi-Jian Chen Zhao-hui Wu Xiao-Ling Lin School of Microelectronics South China University of Technology Guangzhou Guangdong China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory Guangzhou China

ISBN: (纸本)9781665482271

In this paper, a 23-27GHz MMIC low-noise amplifier (LNA) using $0.15\mu\mathrm{m}$ Gallium Nitride (GaN) process is proposed. By introducing a 5-element low-Q network between stages, the proposed 4-stage LNA achieves a good balance among bandwidth, noise figure (NF), gain and input return loss. The LNA exhibits a peak gain of 25.2dB and a minimum NF of 1.52dB with a 3-dB bandwidth from 23 to 27GHz. The input return loss and output return loss are better than 10 dB and 15 dB respectively. The LNA MMIC can be powered-up using a +5V DC power supply and it consumes total DC current of 30 rnA. The overall chip size is 2.7 $\times 1.8\text{mm}^{2}$ .

关键词： Low-noise amplifiers Noise figure Microwave technology Microwave integrated circuits Power supplies RNA Millimeter wave technology

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Pressure-stabilized electride Li10Si with superconducting and superionic behavior

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Physical Review B 2024年第13期110卷 134114页

作者： Qinfang Wang Wenwen Cui Weishuo Xu Kun Gao Jian Hao Jingming Shi Hanyu Liu Yinwei Li Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic Engineering Key Laboratory of Material Simulation Methods and Software of Ministry of Education and State Key Laboratory of Superhard Materials College of Physics Shandong Key Laboratory of Optical Communication Science and Technology School of Physical Science & Information Technology of

Electrides have attracted increasing interest due to their diversely physical properties, including low work function, high catalytic activity, as well as potential superconductivity. In this work, using first-principles crystal structure prediction method in combination with first-principles calculations, we uncovered seven thermodynamically stable electrides in the electron-rich Li-Si system at a pressure range of 25–100 GPa, namely C2/cLi5Si, CmcmLi6Si, P21/mLi7Si, ImmaLi7Si, C2/cLi8Si, CmcmLi9Si, and I222Li10Si. Among these predicted structures, five of them are superconductor. In particular, the superconducting critical temperature Tc of I222Li10Si was estimated to be approximately 15 K at 95 GPa. Our in-depth analysis shows that this high superconductivity is attributed to the strong coupling between the Li-p electrons and the Li-dominated phonon softening at low frequencies. Additionally, Li10Si undergoes a phase transition from solid state to superionic state at 60 GPa and 850 K, where Si atoms remain fixed to form the lattice, allowing for the diffusion of Li atoms within the interstitial position. Our results reveal the emergence of two distinct dynamic states of superconducting and superionic in this particular system, and the further experimental studies are thus stimulated.

关键词： Superconductors Density functional calculations Density functional theory First-principles calculations

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A wide-band Low-Noise Amplifier with 0.537-0.677dB Noise Figure

A wide-band Low-Noise Amplifier with 0.537-0.677dB Noise Fig...

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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Zhi-Jian Chen Yang Li Honglin Zhang Bin Li Xiao-Ling Lin School of Microelectronics South China University of Technology Guangzhou Guangdong China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory Guangzhou China

ISBN: (纸本)9781665482271

Gallium nitride(GaN) process technology is gradually being used in the design of low-noise amplifiers(LNA) to obtain low-noise performance and high power tolerance ability. This paper presents a GaN monolithic microwave integrated circuits(MMIC) LNA operating in 21-36GHz frequency band, which is designed by 100nm GaN-on-silicon(Si) process. The proposed LNA uses a hybrid structure of common source and cascode. Simulation results show that this LNA can achieve a noise figure of 0.537-0.677dB and a gain of 28.3-30dB. The input and output return loss is better than −10dB, and the stability factor is greater than 1 within 0∼100GHz. P1dB and OIP3 are 16.5dBm and 26dBm, respectively. The proposed LNA has the performance advantages of low noise, high gain, and good linearity.

关键词： Noise figure Low-noise amplifiers Gallium Simulation Millimeter wave technology MMICs Microwave circuits

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Simulation and experiment of microstrip lines temperature rise based on COMSOL Multiphysics

Simulation and experiment of microstrip lines temperature ri...

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IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

作者： Lijuan Huang Jinfu Liao Wenxiao Fang Jianying Wang School of Electronic and Information Engineering South China Normal University Foshan China Component Laboratory Science and Technology on Reliability Physics and Application of Electronic Guangzhou China School of integrated circuit Sun Yat-Sen university Guangzhou China

Conductor loss and dielectric loss of the microstrip line can lead to temperature rise and limit the power capacity of the microstrip circuit. This involves the interaction (coupling) between the electric and temperature fields. In this study, the factors affecting the temperature rise of the microstrip line were analyzed by means of the parallel plate model. In addition, based on COMSOL Multiphysics simulation software, the influence of dielectric dissipation factor tanδ of microstrip lines of FR4 and RO4350B on the temperature rise per unit input power (TRPIP) was simulated. The simulation results under the set basic parameters show that the TRPIP of the strip conductors of the FR4-substrate microstrip lines with tanδ of 0.02 is about 4.8 °C, and that of RO450B-substrate microstrip lines with tanδ of 0.0037 is about 1.38 °C. Finally, in order to verify the simulation results, a non-invasive measuring device with an infrared camera was constructed to measure the heat distribution on the surface of the microstrip line.

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Prediction of Superhard BN_(2) with High Energy Density

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Chinese physics Letters 2021年第1期38卷 125-130页

作者： Yiming Zhang Shuyi Lin Min Zou Meixu Liu Meiling Xu Pengfei Shen Jian Hao Yinwei Li Laboratory of Quantum Functional Materials Design and Application School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China

Considering that pressure-induced formation of short,strong covalent bonds in light-element compounds can produce superhard materials,we employ structure searching and first-principles calculations to predict a new class of boron nitrides with a stoichiometry of BN_(2),which are stable relative to alpha-B and alpha-N_(2) at ambient *** ambient pressure,the most stable phase has a layered structure(h-BN_(2)) containing hexagonal BN layers between which there are intercalated N_(2) *** 25 GPa,a three-dimensional P4_(2)/mmc structure with single N-N bonds becomes the most ***,thermal,and mechanical stability calculations reveal that this structure can be recovered under ambient *** calculated stress-strain relations demonstrate an intrinsic superhard nature with an estimated Vickers hardness of ~43 *** structure has a potentially high energy density of ~4.19 kJ/g.

关键词： ambient structure hexagonal

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Research on Fault Diagnosis and Detection of On-Line Monitoring Equipment Based on Internet of Things

Research on Fault Diagnosis and Detection of On-Line Monitor...

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作者： Lu, Guiping Liang, Jiaran Shentu, Zeyu Wu, Wenxiong He, Minghao Xiao, Zhiyong Li, Jianke Beijing Institute of Technology Zhuhai Zhuhai Guangdong519088 China The Fifth Electronics Research Institute of Ministry of Industry and Information Technology Science and Technology on Reliability Physics and Application of Electronic Component Laboratory Guangzhou Guangdong510610 China

In order to quickly and accurately identify one of the many equipment that has stopped working or a working environment has changed due to errors. A method based on the Internet of things online monitoring equipment is designed to observe whether equipment is working normally. Through the design of an intelligent collection card with a variety of sensors, information will be collected and transmitted to a collection server, and finally uploaded to a cloud, so that experimental conditions can be traced back to whether experimental conditions have been artificially changed or whether equipment has been not operated properly. Through the data analysis of a software operation platform, the current status of electrical safety testing equipment and the results of testing data can be monitored online, and then the fault of electrical safety equipment can be diagnosed. That is, the real-time monitoring and fault diagnosis of electrical safety equipment and the unified management of on-line equipment. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Failure analysis

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