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Current-Induced Magnetic Switching in an L1_(0) FePt Single Layer with Large Perpendicular Anisotropy Through Spin–Orbit Torque

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Engineering 2022年第5期8卷 55-61页

作者： Kaifeng Dong Chao Sun Laizhe Zhu Yiyi Jiao Ying Tao Xin Hu Ruofan Li Shuai Zhang Zhe Guo Shijiang Luo Xiaofei Yang Shaoping Li Long You School of Automation China University of GeosciencesWuhan 430074China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems China University of GeosciencesWuhan 430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China China Resources Microelectronics Limited Shanghai 200072China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518000China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China

In this study,current-induced partial magnetization-based switching was realized through the spin–orbit torque(SOT)in single-layer L1_(0) FePt with a perpendicular anisotropy(K_(u⊥))of 1.19×10^(7) erg·cm^(-3)(1 erg·cm^(-3)=0.1 J·m^(-3)),and its corresponding SOT efficiency(βDL)was 8×10^(-6) Oe·(A·cm^(-2))^(-1)(1 Oe=79.57747 A·m^(-1)),which is several times higher than that of the traditional Ta/CoFeB/MgO structure reported in past *** SOT in the FePt films originated from the structural inversion asymmetry in the FePt films since the dislocations and defects were inhomogeneously distributed within the ***,the FePt grown on MgO with a granular structure had a larger effective SOT field and effi-ciency than that grown on SrTiO_(3)(STO)with a continuous *** SOT efficiency was found to be considerably dependent on not only the sputtering temperature-induced chemical ordering but also the lattice mismatch-induced evolution of the *** findings can provide a useful means of efficiently electrically controlling a magnetic bit that is highly thermally stable via SOT.

关键词： L1_(0)FePt SOT Inversion asymmetry Magnetic switching Perpendicular anisotropy

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A Dual-Band Metagrating for Diffraction control: Design and Experimental Demonstration

A Dual-Band Metagrating for Diffraction Control: Design and ...

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IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

作者： Shan Xuan Kai Feng Jianjia Yi School of Information and Communications Engineering Xi’an Jiaotong University Xi’an China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin China State Key Laboratory of Millimeter Waves Southeast University Nanjing China

The metagratings have attracted extensive attention over the recent years as a special class of periodic metamaterials for their near-perfect electromagnetic wave manipulation through a simple and sparse array structure. In this paper, we propose a dual-band metagrating design for wide-angle reflection. The proposed structure with dual-band response can perform as one period at low frequency band and equal as two periods at high frequency band, thus realizing beam manipulation at two frequency bands by periodic conversion. The design procedure is fast, accurate and easy to implement combined with analytical design and local periodic approximation. To verify the performance of the proposed design, a dual-band printed circuit board metagrating that performs perfect anomalous reflection at 6.16 GHz and 20 GHz is designed and demonstrated.

关键词： Diffraction Printed circuits Dual band Switches Frequency conversion Microwave frequencies Reflection

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Weakening CO poisoning over size-and support-dependent Pt_(n)/X-graphene catalyst(X=C,B,N,n=1-6,13)

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Rare Metals 2023年第4期42卷 1138-1145页

作者： An-Qi Dong Hui Li Han-Ming Wu Kai-Xiang Li Yuan-Kai Shao Zhen-Guo Li Shu-Hui Sun Wei-Chao Wang Wei-Bo Hu Department of Electronics and Tianjin Key Laboratory of Photo-Electronic Thin Film Device and Technology Nankai UniversityTianjin300071China College of Information Science and Engineering Jiaxing UniversityJiaxing314001China Zhejiang Engineering Research Center of Intelligent Human Health Situation Awareness Jiaxing UniversityJiaxing314001China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.LtdTianjin300300China Institute National de la Recherche Scientifique(INRS) CentreÉnergie Matériaux et TélécommunicationsVarennesQuébecJ3X 1P7Canada College of Electronic Information and Optical Engineering Nankai UniversityTianjin300071China

CO poisoning is one of the obstacles for platinum catalysts toward the electro-catalysis process for proton exchange membrane fuel cell(PEMFC)or direct methanol fuel cell(DMFC).Herein,we aim to weaken the CO poisoning... 详细信息

关键词： sizes methanol size

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Ground-to-air Defense Firepower Assignment Decision Based on Non-cooperative Game

Ground-to-air Defense Firepower Assignment Decision Based on...

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2021 China Automation Congress, CAC 2021

作者： Gong, Hua Cui, Mengya Zhang, Yong Sun, Wenjuan School of Science Shenyang Ligong University Shenyang110159 China School of Automation and Electrical Engineering Shenyang Ligong University Shenyang110159 China Science and Technology on Electro-Optical Information Security Control Laboratory Tianjin300308 China

ISBN: (纸本)9781665426473

The key problem of ground-to-air defense is how to make accurate and effective firepower assignment decision for attacking targets. A multi-objective optimization model of ground-to-air defense firepower assignment is established with the aim of maximizing the damage probability and minimizing the weapon consumption, and non-cooperative game theory is used to solve the problem. A non-cooperative game model is established by mapping the two objectives to players, and weapon assignment schemes to strategy profiles. An improved tabu genetic algorithm based on Nash equilibrium is designed to get the assignment scheme. Experimental results show that the proposed method has better convergence and stability than the improved genetic algorithm based on tabu search for multi-objective optimization model. © 2021 IEEE

关键词： Genetic algorithms

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Simulation and analysis of far-field single-photon response model in Geiger avalanche mode 7

Simulation and analysis of far-field single-photon response ...

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7th Global Intelligent Industry Conference, GIIC 2024

作者： Ou, Hengchang Ma, Le Jiang, Peng Wang, Pengfei Lu, Jie Zhou, Xin Sun, Jianfeng National Key Laboratory of Laser Spatial Information Institute of Opto-Electronic Harbin Institute of Technology Heilongjiang Harbin150001 China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing100074 China Beijing Institute of Remote Sensing Beijing100854 China 44th Research Institute China Electronics Technology Group Corporation Chongqing400060 China Research Center for Space Optical Engineering Harbin Institute of Technology Heilongjiang Harbin150001 China Zhengzhou Research Institute of Harbin Institute of Technology Zhengzhou Henan450046 China

ISBN: (纸本)9781510682986

Poisson distribution model is the basis of data analysis for GM-APD lidar, but it is only applicable to the mirror reflected target under ideal conditions, and cannot accurately describe the photon triggering process of actual GM-APD lidar detection. For the actual target with rough surface, the negative binomial distribution with M as the parameter can describe the photon distribution model more accurately. In order to solve this problem, this paper compares and analyzes Poisson distribution triggering model and the negative binomial distribution triggering model that conforms to the triggering situation of the echo signal of the target with rough surface, considering the differences in the triggering probability under different noise and signal levels. The results show that the trigger probability curve corresponding to the trigger model based on negative binomial distribution is lower in peak value, wider in bottom value and fatter overall than that of the trigger model based on Poisson distribution, and the difference between the two is more prominent under the conditions of low noise level and high signal level. This study has guiding significance for the signal extraction research based on different surface echoes. © 2024 SPIE.

关键词： Photons

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Recent Advances in electromagnetic Optimization Methods for Metamaterial Absorbers

Recent Advances in Electromagnetic Optimization Methods for ...

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International Applied Computational electromagnetics Society Symposium (ACES)

作者： Jiaping Fu Jing Jin Zixin Liu Ke Cao Tengyu Li Hai Lin Lijie Chen College of Physics Science and Technology Central China Normal University Wuhan China National Key Laboratory of Electromagnetic Effect and Security on Marine Equipment China Ship Development and Design Centre China and School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350355581

ISBN: (纸本)9798350355598

Metamaterial absorbers have superior performance in absorbing, suppressing, and manipulating the electromagnetic (EM) waves. Due to the challenges of finding the optimal design parameters, the EM optimization for metamaterial absorbers is time-consuming. It is important to develop an efficient method to improve the speed and efficiency of EM optimization for metamaterial absorbers. This paper provides recent advances in EM optimization methods for metamaterial absorbers, including the artificial neural network (ANN) surrogate-based optimization method and the ANN-space mapping (SM) surrogate-based optimization method.

关键词： Computational modeling electromagnetic scattering Optimization methods Prototypes Artificial neural networks Computational electromagnetics Metamaterials electromagnetics Integrated circuit modeling

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Unidirectional Transmission Waveguide with Polarization Locking Based on Metasurface

Unidirectional Transmission Waveguide with Polarization Lock...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Li-jie. Chen Rui Zhou Hai Lin National Key Laboratory of Electromagnetic Effect and Security on Marine Equipment China Ship Development and Design Centre. China and School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China College of Physical Science and Technology Central China Normal University Wuhan Hubei China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

When the polarization state of a system is linearly locked to momentum and its scatterers do not induce spin flips, the resulting edge state with polarization locking can demonstrate unidirectional reflectionless transmission. In classical systems, the creation of polarization-locked edge states relies on two key symmetry transformations: electromagnetic duality (EM-duality) symmetry and parity time-reversal duality (PT-duality) symmetry. While EM-duality supports infinitesimal line-surface wave modes, PT-duality facilitates line-guided wave modes. However, the transmission power capacity of these modes is typically limited by the size of the model. To overcome this limitation, our work integrates both transformation physics mechanisms to develop a chiral waveguide with miniaturization, high power, and increased capacity through the design of a tailored metasurface structure. This innovative design approach opens up new avenues in the realms of photonics and electronics, particularly in the domains of information transmission and processing.

关键词： Wireless communication Antenna theory Transmitting antennas electromagnetic scattering Waveguide theory information processing Metasurfaces electromagnetics Physics Photonics

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A Real-Time Demonstration of Bidirectional Multi-Format/Rate-Adjustable Integrated Laser Communication/Ranging for Satellite Communication

A Real-Time Demonstration of Bidirectional Multi-Format/Rate...

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Conference on Lasers and electro-Optics (CLEO)

作者： Yizhou Wang Yuanxiang Wang Zhen Luo Linsheng Zhong Yang Zou Xueyuan Ao Jiale Liu Feng Fan Xiaoliang Li Xiaoxiao Dai Qi Yang Deming Liu Wuhan National Lab for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China Hubei Key Laboratory of Distributed System Security Hubei Engineering Research Center on Big Data Security School of Cyber Science and Engineering Huazhong University of Science and Technology Wuhan China Beijing Research Institute of Telemetry Beijing China Jinyinhu Laboratory Wuhan China

A multi-format/rate-adjustable integrated laser communication/ranging system is proposed, achieving adjustable rates between 0.625-10Gbit/s. Real-time experiment shows that at 1e-4 BER the ranging error is only 0.29% ... 详细信息

ISBN: (纸本)9798350369311

关键词： Laser theory Codes Sensitivity Lasers Measurement uncertainty Measurement by laser beam electro-optic effects Real-time systems Distance measurement Satellite communications

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A Multilevel Non-interference Vulnerability Analysis Method for information Leakage Problem 6

A Multilevel Non-interference Vulnerability Analysis Method ...

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6th IEEE International Conference on Data science in Cyberspace, DSC 2021

作者： Zhong, Wenjing Zhao, Jinjing Hu, Hesuan National Key Laboratory Of Science And Technology On Information System Security Beijing100101 China School Of Electro-Mechanical Engineering Xidian University Xi'an Jiaotong University State Key Laboratory For Manufacturing Systems Engineering Shaanxi Xi'an710071 China

ISBN: (纸本)9781665418157

security vulnerabilities caused by information leakage are a critical aspect of the security for information systems. Such vulnerabilities can be identified by non-interference analysis. Strong nondeterministic non-interference (SNNI) and bisimulation SNNI (BSNNI) are the typical properties of non-interference. Existing works related to non-interference analysis are mainly based on the setting with only two security levels. Such setting is coarse-grained compared to the real system. In this paper, we analyze the non-interference with multiple security levels by integer linear programming. Obviously, the non-interference with multiple security levels is more fine-grained but more complex than that with only two security levels. On the perspective of complexity, we provide the general and simplified non-interference analyses in turn for multilevel SNNI and BSNNI which are defined on the concepts of upper sets. The general analysis is derived from the definitions of multilevel SNNI and BSNNI, and solve the identification problem of multilevel SNNI and BSNNI directly. By analyzing and removing the impact of upper sets' coverability, the simplified analysis reduces the redundancy and improves the efficiency in the analysis process. © 2021 IEEE.

关键词： Integer programming

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optical meta-waveguides for integrated photonics and beyond

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Light(science & Applications) 2021年第12期10卷 2263-2306页

作者： Yuan Meng Yizhen Chen Longhui Lu Yimin Ding Andrea Cusano Jonathan A.Fan Qiaomu Hu Kaiyuan Wang Zhenwei Xie Zhoutian Liu Yuanmu Yang Qiang Liu Mali Gong Qirong Xiao Shulin Sun Minming Zhang Xiaocong Yuan Xingjie Ni State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information Science and TechnologyFudan UniversityShanghai 200433China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Electrical Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA Optoelearonic Division Department of EngineeringUniversity of Sannio1-82100 BeneventoItaly Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua University100084 BeijingChina Yiwu Research Institute of Fudan University Chengbei RoadYiwu City 322000 ZhejiangChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 HubeiChina

The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic *** integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits,giving rise to numerous metawaveguides with unprecedented strength in controlling guided electromagnetic ***,we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms,such as dielectric or plasmonic waveguides and optical *** results and representative applications are comprehensively *** physical models with explicit design tutorials,either physical intuition-based design methods or computer algorithms-based inverse designs,are cataloged as *** highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems,by enhancing light-matter interaction strength to drastically boost device performance,or offering a versatile designer media for manipulating light in nanoscale to enable novel *** further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits,biomedical sensing,artificial intelligence and beyond.

关键词： waveguides waveguide beyond

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