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Magnetoresistance anomaly in Fe_(5)GeTe_(2)homo-junctions induced by its intrinsic transition

nano Research 2023年第7期16卷 10443-10450页

作者： Ruijie Zhao Yanfei Wu Shaohua Yan Xinjie Liu He Huang Yang Gao Mengyuan Zhu Jianxin Shen Shipeng Shen Weifeng Xu Zeyu Zhang Liyuan Zhang Jingyan Zhang Xinqi Zheng Hechang Lei Ying Zhang Shouguo Wang School of Materials Science and Engineering Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China School of Materials Science and Engineering Anhui UniversityHefei 230601China Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China

Two-dimensional van der Waals(2D vdW)magnets have attracted great attention recently and possess the unprecedented advantages of incorporating high-quality vdW heterostructures and homostructures into spintronic devices,and exploring various physical phenomena or *** them,Fe_(5)GeTe_(2)(F5GT)has ferromagnetic order close to room temperature,however the magnetic properties near its intrinsic transitions and F5GT-based 2D devices remain mostly ***,we systematically demonstrate the peculiar magnetic properties of Fe_(5)GeTe_(2)nanoflakes near its intrinsic transition temperature(Tp)which is far lower than its Curie temperature(TC)of~265 K,and firstly discover anomalous magnetoresistance effect in F5GT homo-junctions by magneto-transport *** strongest anomalous Hall effect occurs around Tp which is located in a temperature range from 130 to 160 K for the F5GT nanoflakes with different ***,negative magnetoresistance(N-MR)and butterfly-shaped magnetoresistance(B-MR)are observed in F5GT homo-junction devices,and they appeared only in an intermediate temperature range from 110 to 160 K,noticeably showing the maxima near the T_(p)rather than the lowest *** experimental results clearly reveal the significant influence of intrinsic transitions on magnetic properties of F5GT and magnetoresistance effect in F5GT homo-junction devices,which imply a new strategy to achieve highperformance 2D spintronic devices by tuning intrinsic magnetic or structural transitions in 2D vdW magnets.

关键词： Two-dimensional(2D)van der Waals magnets Fe_(5)GeTe_(2) homo-junction magnetoresistance

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A Novel Multiple Modes Resonant Sensor Featuring Blue Sideband Excitation 38

A Novel Multiple Modes Resonant Sensor Featuring Blue Sideba...

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38th IEEE International Conference on micro Electro Mechanical systems, MEMS 2025

作者： Xu, Jiao Zheng, Zhuoyue Xi, Jingqian Zhang, Ziqian Liu, Huafeng Zhang, Pan Chen, Jianlin Wang, Chen Kraft, Michael Wang, Yuan Martins, R.P. Mak, Pui-In Huazhong University of Science and Technology Moe Key Laboratory of Fundamental Physical Quantities Measurement Pgmf School of Physics Wuhan430074 China University of Macau Institute of Microelectronics State Key Laboratory of Analog and Mixed-Signal Vlsi 999078 China Peking University National Key Laboratory of Advanced Micro and Nano Manufacture Technology School of Integrated Circuits 100871 China Shanghai University School of Microelectronics 200444 China Ku Leuven Department of Electrical Engineering-MNS Leuven3000 Belgium

ISBN: (纸本)9798331508890

This paper reports a novel MEMS resonant structure functioning as a baseline resonant electrostatic force/temperature sensor, highlighting its substantial potential in sensing applications. The resonator, characterized by a dual-cosine structure, is capable of simultaneous multiple resonant modes actuation within the 300 kHz range, through a sole-source drive approach using the recent emerging Blue Sideband Excitation (BSE) technique. This method enables a distinctive multi-modal response, essential for multi-parameter measurements. The research focuses on the sensor's temperature characteristics, electrostatic perturbation sensitivity, and noise floor. Notably, the study reveals intriguing temperature responses across different modes, where certain modes exhibit a significant frequency rise with increasing temperature, this is counter-intuitive with common MEMS resonator devices, prompting further investigation into the underlying mechanisms. The analysis of electrostatic perturbation sensitivity and noise background further unfolds the resonator's performance under various excitation conditions, laying a foundation for advancing sensor functionality, and providing solid evidence on the viability of the subject. To sum up, this study highlights the resonator's potential as a high-precision sensor, opening new opportunities for MEMS sensor design and multi-parameter measurement applications. © 2025 IEEE.

关键词： microchannels

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Structure,electric,and dielectric properties of(Sr_(0.7)Ca_(0.3))_(1.02)(Zr_(0.95−x)Ti_(0.05)Mn_(x))O_(3+δ)ceramics for BME-MLCCs application

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Journal of Advanced Ceramics 2024年第9期13卷 1382-1393页

作者： Qingyang Pang Ying Chen Zhixiang Wang Bin Zhou Xin Li Chao Mu Guangping Gu Genshui Wang Key Laboratory of Inorganic Functional Materials and Devices Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Micro-system and Information TechnologyChinese Academy of SciencesShanghai 200050China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China China Zhenhua Xinyun Electronic Components Co. Ltd.Guiyang 550018China

Zirconate-based dielectric ceramics are potential materials for base metal electrode multilayer ceramic capacitors(BME-MLCCs)due to their exceptional chemical and thermal stability,as well as excellent dielectric *** this work,(Sr_(0.7)Ca_(0.3))1.02(Zr_(0.95−x)Ti_(0.05)Mn_(x))O_(3)+δ(SCZTM,0≤x≤0.05)ceramics with two coexisting phases were prepared using a solidstate reaction method in a reducing *** study investigates the impact of Mn doping on sintering temperature,microstructure,and electrical properties of SCZTM *** doping can reduce the sintering temperature from 1450 to 1300℃.The impact of Mn doping on the structure and phonon vibration is minimal,resulting in a negligible effect on the intrinsic *** valence states of Mn ions and defects were characterized by X-ray photoelectron spectroscopy(XPS)and thermally stimulated depolarization current(TSDC)*** results demonstrate the significant role of Mn doping in nonintrinsic *** to the decrease in the concentration of oxygen vacancies(V_(O)),SCZTM(x=0.01)ceramics exhibit attractive properties:resistivity(ρ)=8.93×10^(14)Ω·cm,dielectric constant(ε_(r))=36.16,dielectric loss(tanδ)=2.43×10^(–4),temperature dependence of dielectric constant(τ_(ε))=15.44 ppm/℃(@−55–200℃,1 MHz),Q×f=30,257 GHz(@6.12 GHz),and temperature coefficient of resonant frequency(τf)=–9.9 ppm/℃.SCZTM(x=0.01)ceramic powders were used to successfully fabricate Ni-based multilayer ceramic capacitors(MLCCs)with a high insulation resistance of IR≥39.6 TΩ,an ultralow dielectric loss of tanδ=0.2×10^(–4),and a wide operating temperature range(temperature coefficient of capacitance(T_(cc))=10.88 ppm/℃,@−55–200℃,1 MHz).SCZTM ceramics exhibit properties that make them suitable for use as BMEMLCC materials with potential market applications.

关键词： dielectric properties reducing atmosphere defects multilayer structure

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Graphene-based dual-function acoustic transducers for machine learning-assisted human-robot interfaces

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InfoMat 2023年第2期5卷 66-79页

作者： Hao Sun Xin Gao Liang-Yan Guo Lu-Qi Tao Zi Hao Guo Yangshi Shao Tianrui Cui Yi Yang Xiong Pu Tian-Ling Ren Institute of Microelectronics and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijingPeople's Republic of China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingPeople's Republic of China State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingPeople's Republic of China School of Computer Science&Technology Beijing Institute of TechnologyBeijingPeople's Republic of China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijingPeople's Republic of China

Human–robot interface(HRI)electronics are critical for realizing robotic ***,we report graphene-based dual-function acoustic transducers for machine learning-assisted human–robot interfaces(GHRI).The GHRI functions both an artificial ear through the triboelectric acoustic sensing mechanism and an artificial mouth through the thermoacoustic sound emission *** success of the integrated device is also attributed to the multifunctional laser-induced graphene,as either triboelectric materials,electrodes,or thermoacoustic *** systematically optimizing the structure parameters,the GHRI achieves high sensitivity(4500 mV Pa^(–1))and operating durability(1000000 cycles and 60 days),capable of recognizing speech identities,emotions,content,and other information in the human *** the assistance of machine learning,30 speech categories are trained by a convolutional neural network,and the accuracy reaches 99.66%and 96.63%in training datasets and test ***,GHRI is used for artificial intelligence communication based on recognized speech *** work shows broad prospects for the development of robotic intelligence.

关键词： human-robot interface laser-induced graphene machine learning thermoacoustic triboelectric nanogenerator

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Magnetic phase transitions in the triangular-lattice spin-1 dimer compound K2Ni2(SeO3)3

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Physical Review B 2024年第21期109卷 214430-214430页

作者： Lei Yue Ziyou Lu Kun Yan Le Wang Shu Guo Ruixin Guo Peng Chen Xiaobin Chen Jia-Wei Mei Department of Physics School of Science and State Key Laboratory on Tunable Laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Shenzhen Institute for Quantum Science and Engineering International Quantum Academy Shenzhen 518048 China Dongguan Guangdong 523808 China Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices

In our study, we conduct magnetization and heat capacity measurements to investigate field-induced magnetic phase transitions within the newly synthesized compound K2Ni2(SeO3)3, a spin-1 dimer system arranged on a triangular lattice. From our first-principles simulations, we determine that the spin system in K2Ni2(SeO3)3 can be represented as a two-dimensional triangular-lattice spin-1 dimer model, including an intra-dimer exchange of J1=0.32meV, an inter-dimer exchange of J2=0.79meV, and an easy-axis anisotropy of D=0.14meV. The presence of easy-axis magnetic anisotropy explains the distinct magnetic phase diagrams observed under c-axis directional and in-plane magnetic fields. Notably, our investigation unveils a two-step phase transition with the magnetic field aligned with the c direction. Our findings yield valuable insights into the magnetic phase transitions inherent to geometrically frustrated magnetic systems featuring dimer structures.

关键词： Frustrated magnetism Magnetic phase transitions Triangular lattice Magnetization measurements Specific heat measurements X-ray diffraction

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Tunable unconventional integer quantum Hall effect in two-dimensional Dirac-Weyl systems

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Physical Review B 2024年第8期109卷 L081404-L081404页

作者： Y. J. Jin Y. Xu X. L. Xiao Z. J. Chen H. Xu Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics South China Normal University Guangzhou 510006 China Department of Physics & Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 People's Republic of China Institute of Micro/Nano Materials and Devices Ningbo University of Technology Ningbo 315016 Zhejiang People's Republic of China Department of Physics Chongqing University Chongqing 400044 People's Republic of China Songshan Lake Materials Laboratory Dongguan 523808 People's Republic of China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 People's Republic of China

Two-dimensional (2D) Dirac semimetals possess intriguing properties due to their low-energy excitations behaving like Dirac fermions. A hallmark of these materials is the unconventional integer quantum Hall effect (IQHE), originating from the quantized Berry phase of Dirac fermions. Herein, using symmetry analysis, tight-binding models, and numerical calculations, we reveal 2D Dirac-Weyl fermions in inversion symmetry breaking systems that exhibit tunable unconventional IQHE. These unique 2D fermions are characterized by a pair of helical edge states related by time-reversal symmetry T, which connect the projections of a Dirac point and two separate Weyl nodes, indicating that the Dirac and Weyl points are interconnected as a whole. We show that these 2D Dirac-Weyl fermions exhibit a tunable unconventional IQHE, featuring a Hall plateau sequence shifted by three units of 2e2h. The distance between adjacent quantized Hall plateaus can be adjusted by strain, which is a unique feature that distinguishes from what is observed in graphene. Through first-principles calculations, we identify an ideal candidate material for hosting 2D Dirac-Weyl fermions, offering a promising avenue for experimental verification. Our findings open up a door to exploring unconventional IQHE in condensed-matter systems beyond graphene.

关键词： Integer quantum Hall effect Landau levels Symmetry protected topological states Tight-binding model k dot p method

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Ultra-Soft Neural Probe with a Temporary High-Strength U-Section Coating by Picosecond Laser micromachining 22

Ultra-Soft Neural Probe with a Temporary High-Strength U-Sec...

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22nd International Conference on Solid-State Sensors, Actuators and microsystems, Transducers 2023

作者： Sun, Fanqi You, Xiaoli Zhou, Yuhao Wang, Minghao Xu, Mengfei Yuan, Xichen Chang, Honglong Liu, Jingquan Ji, Bowen Collaborative Innovation Center Of Northwestern Polytechnical University Shanghai201108 China Northwestern Polytechnical University Unmanned System Research Institute Xi'an710072 China Northwestern Polytechnical University Ministry Of Education Key Laboratory Of Micro/Nano Systems For Aerospace School Of Mechanical Engineering Xi'an710072 China Hangzhou Dianzi University College Of Electronics And Information Hangzhou310018 China Shanghai Jiao Tong University National Key Laboratory Of Science And Technology On Micro/Nano Fabrication Department Of Micro/Nano Electronics Shanghai200240 China

ISBN: (纸本)9784886864352

This paper reports an ultra-soft neural probe with a temporary high-strength U-section coating of polyethylene glycol (PEG) for the first time. Its fabrication is compatible with MEMS processes, and an ultrathin U-section coating over the probe's back and sidewall is precisely formed by spinning and cold laser cutting. With this novel coating, the probe has both minimized cross-sectional area and sufficient mechanical strength for low-invasive penetration into brain. Besides, the remained ultra-soft deformable probe after PEG dissolution is expected to be the next generation of neural implant for chronic recording. © 2023 IEEJ.

关键词： Picosecond Laser Cutting U-section Coating Ultra-soft Neural Probe

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Brilliant Green: A long-buried water-soluble AIEgen with nearinfrared fluorescence for living cell actin staining 3

Brilliant Green: A long-buried water-soluble AIEgen with nea...

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3rd International Conference on Biomedical and Intelligent systems, IC-BIS 2024

作者： Liu, Luxuan Wu, Yayun Tang, Dongbao Jia, Zhaoyuan Wang, Jiaoli Gong, Ping Fang, Xiaohong Tan, Yuyu Zhang, Pengfei School of Electrical Engineering Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture University of South China Hengyang421001 China Beijing National Research Center for Molecular Sciences Institute of Chemistry Key Laboratory of Molecular Nanostructure and Nanotechnology Chinese Academy of Science Beijing100190 China Guangdong Key Laboratory of Nanomedicine CAS-HK Joint Lab of Biomaterials CAS Key Laboratory of Biomedical Imaging Science and System Shenzhen Engineering Laboratory of Nanomedicine and Nanoformulations CAS Key Lab for Health Informatics Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China

ISBN: (纸本)9781510681279

Observation of actin in cells is crucial for the investigation of cell motility, protein transcription, pathogen infection, and cell cycle research. In this study, we have identified Brilliant Green (BG) as a water-soluble AIEgen (luminogen with aggregation-induced emission properties) that can be utilized for actin staining. Our experimental findings highlight the effectiveness of BG for long-term live cell imaging, as well as its remarkable stability and resistance to photobleaching. © 2024 SPIE.

关键词： Photobleaching

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A reflective display based on the electro-microfluidic assembly of particles within suppressed water-in-oil droplet array

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Light(science & Applications) 2023年第12期12卷 2742-2754页

作者： Shitao Shen Haoqiang Feng Yueming Deng Shuting Xie Zichuan Yi Mingliang Jin Guofu Zhou Paul Mulvaney Lingling Shui Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and DevicesSchool of Information and Optoelectronic Science and EngineeringSouth China Normal University510006 GuangzhouChina International Joint Laboratory of Optofluidic Technology and System(LOTS) National Center for International Research on Green OptoelectronicsSouth China Academy of Advanced OptoelectronicsSouth China Normal University510006 GuangzhouPeople’s Republic of China School of Electronic Information University of Electronic Science and Technology of ChinaZhongshan Institute528402 ZhongshanChina ARC Centre of Excellence in Exciton Science School of ChemistryUniversity of MelbourneParkvilleVIC 3010Australia

Reflective displays have stimulated considerable interest because of their friendly readability and low energy ***,we develop a reflective display technique via an electro-microfluidic assembly of particles(eMAP)strategy whereby colored particles assemble into annular and planar structures inside a dyed water droplet to create"open"and"closed"states of a display ***-in-oil droplets are compressed within microwells to form a pixel *** particles dispersed in droplets are driven by deformation-strengthened dielectrophoretic force to achieve fast and reversible motion and assemble into multiple *** eMAP based device can display designed information in three primary colors with≥170°viewing angle,~0.14 s switching time,and bistability with an optimized material *** proposed technique demonstrates the basis of a high-performance and energy-saving reflective display,and the display speed and color quality could be further improved by structure and material optimization;exhibiting a potential reflective display technology.

关键词： deformation reflective fluid

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A comprehensive review of miniatured wind energy harvesters

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nano Materials science 2021年第2期3卷 170-185页

作者： Quan Wen Xianming He Zhuang Lu Reinhard Streiter Thomas Otto Key Laboratory of Fundamental Science of Micro/Nano-Device and System Technology Chongqing UniversityChongqing400044People's Republic of China Microsystem Research Center Chongqing UniversityChongqing400044People's Republic of China Fraunhofer Institute for Electronic Nano Systems(ENAS) Chemnitz09131Germany

Following the current rapid development of the Internet of Things(IoT)and wireless condition monitoring systems,energy harvesters which use ambient energy have become a key part of achieving an energy-autonomous *** wind energy harvesters have attracted widespread attention because of their great potential of power density as well as the rich availability of wind energy in many possible areas of *** article provides readers with a glimpse into the state-of-the-art of miniature wind energy *** crucial factors for them to achieve high working efficiency under lower operational wind speed excitation are *** potential energy coupling mechanisms are discussed in *** approaches for broadening operational wind-speed-range given a variety of energy coupling mechanisms are also presented,as observed in the *** enhancement mechanisms including hydrodynamic configuration optimization,and non-linear vibration pick-up structure are *** are drawn and the outlook for each coupling mechanisms is presented.

关键词： Energy harvester Wind energy Miniature wind-induced vibration energy harvester Energy coupling mechanism Performance enhancement mechanisms

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