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Ultralow-Vertical-Current Magnetization Switching Effect in an All Van der Waals 2d Heterostructure

Chinese Physics Letters 2025年第2期42卷 239-248页

作者： Hao Wu Li Yang Gaojie Zhang Wen Jin Jie Yu Bichen Xiao Ahmed Annas Wenfeng Zhang Haixin Chang Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die&Mold TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China

The manipulation of magnetization and spin polarization using electrical currents represents a fundamental breakthrough in *** has formed the foundation for data storage and next-generation computing ***-transfer torque(STT)and spin-orbit torque(SOT)have emerged as prominent mechanisms in current-driven magnetization ***,these approaches typically require critical current densities in the range of 10^(6) to 10^(9) A·cm^(-2),resulting in significant heat generation during data writing ***,we report the discovery of an ultralow-vertical-current magnetization switching effect in a van der Waals ferromagnetic/ferroelectric heterostructure based on the modulation of the critical magnetic field(H_(C))using small vertical currents,with a critical current density as low as 1.81A·cm^(-2) and an average effective field(H_(eff)/J_(C))as high as 150.3mT·A^(-1)·cm^(2).This unique magnetization switching effect with ultralow-critical-vertical-current densities typically six to nine orders of magnitude lower than those of the STT and SOT provides a new transformative and viable pathway for developing next-generation spintronic and quantum technologies.

关键词： magnetization critical typically

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Integrated 64 pixel UV image sensor and readout in a silicon carbide CMOS technology

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Microsystems & Nanoengineering 2022年第5期8卷 207-223页

作者： Joost romijn Sten Vollebregt Luke M.Middelburg BrahimEl Mansouri Henk W.van Zeijl AlexanderMay Tobias Erlbacher Johan Leijtens Guoqi Zhang Pasqualina M.Sarro Laboratory of Electronic Components Technology and Materials(ECTM)Department of MicroelectronicsDelft University of TechnologyDelftThe Netherlands Fraunhofer Institute for Integrated Systems and Devices Technology IISB ErlangenGermany Lens R&D NoordwijkThe Netherlands

This work demonstrates the first on-chip UV optoelectronic integration in 4H-SiC CMOS,which includes an image sensor with 64 active pixels and a total of 1263 transistors on a 100mm^(2) *** reported image sensor offers serial digital,analog,and 2-bit AdC outputs and operates at 0.39 Hz with a maximum power consumption of 60μW,which are significant improvements over previous *** optoelectronics have applications in flame detection,satellites,astronomy,UV photography,and *** complexity of this optoelectronic system paves the way for new applications such harsh environment microcontrollers.

关键词： optoelectronic image carbide

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development of Python-Based Applications for Virtual Instrument Control Using PyQt5, PyVISA, and SCPI Protocol 2

Development of Python-Based Applications for Virtual Instrum...

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2nd International Conference on Emerging Trends in Information technology and Engineering, ic-ETITE 2024

作者： rao, Abhishek Singh Sai, deepak Mahajan, Anita Taterao Singh, Vaibhav Pratap Neiwal, rahul Pasupuleti, Haribabu Sudarsan, S.d. Group Bengaluru India Ministry of Electronics and Information Technology R&d in It Group Delhi India Centre for Development of Advanced Computing Bangalore Bengaluru India

ISBN: (纸本)9798350328202

This work aims to create desktop applications to enable virtual access and control to prominent lab equipment like signal generators, oscilloscopes, spectrum analyzers, etc. The developed applications utilize PyQt5 and PyVISA Python libraries, enabling the creation of Graphical User Interfaces (GUIs) and virtual instrument communication. The applications support USB and Ethernet connection between the PC and the instruments. We demonstrate Python-enabled applications to remotely access a Vector Signal Generator, an Oscilloscope and in conjugation, also use an OEM's Spectrum Analyzer PC application to complete a framework for remote signal generation, analysis, and acquisition which can be useful in various research and testing scenarios in the modern hybrid work culture. © 2024 IEEE.

关键词： Spectrum analyzers

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Improving ionic conductivity of von-Alpen-type NASICON ceramic electrolytes via magnesium doping

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Journal of Advanced Ceramics 2023年第5期12卷 1058-1066页

作者： Il-Seop Jang Wooseok Go Bo-Ye Song Hayoung Park Yun Chan Kang Jinyoung Chun Emerging Materials R&D Division Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Republic of Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841Republic of Korea Energy Storage and Distribution Resources Division Lawrence Berkeley National LaboratoryBerkeley 94720USA

NASICON (sodium (Na) superionic conductor) compounds have attracted considerable attention as promising solid electrolyte materials for advanced Na-based batteries. In this study, we investigated the improvement in ionic conductivities of von-Alpen-type NASICON (vA-NASICON) ceramic electrolytes by introducing a magnesium ion (Mg^(2+)) as a heterogeneous element. The optimal Mg-doped vA-NASICON exhibited a high ionic conductivity of 3.64×10^(−3) S·cm^(−1), which was almost 80% higher than that of un-doped vA-NASICON. The changes in physicochemical properties of the vA-NASICONs through the Mg introduction were systematically analyzed, and their effects on the ionic conductivities of the vA-NASICON were studied in detail. When the optimal ratio of Mg^(2+) was used in a synthetic process, the relative density (96.6%) and grain boundary ionic conductivity (σgb) were maximized, which improved the total ionic conductivity (σt) of the vA-NASICON. However, when Mg^(2+) was introduced in excess, the ionic conductivity decreased because of the formation of an undesired sodium magnesium phosphate (NaxMgyPO_(4)) secondary phase. The results of this study are expected to be effectively applied in the development of advanced sodium-based solid electrolytes with high ionic conductivities.

关键词： NASICON solid electrolyte von-Alpen-type magnesium(Mg)doping ionic conductivity

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Efficiency-loss analysis of monolithic perovskite/silicon tandem solar cells by identifying the patterns of a dual two-diode model’s current-voltage curves

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Journal of Semiconductors 2023年第8期44卷 68-77页

作者： Yuheng Zeng Zetao ding Zunke Liu Wei Liu Mingdun Liao Xi Yang Zhiqin Ying Jingsong Sun Jiang Sheng Baojie Yan Haiyan He Chunhui Shou Zhenhai Yang Jichun Ye Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China University of Chinese Academy of Sciences Beijing 100049China Zhejiang Engineering Research Center for Energy Optoelectronic Materials and Devices Ningbo Institute of Materials Technology&EngineeringCASNingbo 315201China Zhejiang Energy Group R&D Hangzhou 310003China

In this work,we developed a simple and direct circuit model with a dual two-diode model that can be solved by a SPICE numerical simulation to comprehensively describe the monolithic perovskite/crystalline silicon(PVS/c-Si)tandem solar *** are able to reveal the effects of different efficiency-loss mechanisms based on the illuminated current density-voltage(J-V),semi-log dark J-V,and local ideality factor(m-V)*** effects of the individual efficiency-loss mechanism on the tandem cell’s efficiency are discussed,including the exp(V/VT)and exp(V/2VT)recombination,the whole cell’s and subcell’s shunts,and the Ohmic-contact or Schottky-contact of the intermediate *** can also fit a practical J-V curve and find a specific group of parameters by the trial-and-error *** the fitted parameters are not a unique solution,they are valuable clues for identifying the efficiency loss with the aid of the cell’s structure and experimental *** method can also serve as an open platform for analyzing other tandem solar cells by substituting the corresponding circuit *** summary,we developed a simple and effective methodology to diagnose the efficiency-loss source of a monolithic PVS/c-Si tandem cell,which is helpful to researchers who wish to adopt the proper approaches to improve their solar cells.

关键词： monolithic perovskite/silicon tandem solar cell efficiency-loss analysis dual two-diode model SPICE numerical simula-tion

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Selective recovery of rare earth elements by smelting of magnets

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Journal of rare Earths 2025年第1期43卷 209-217,I0008页

作者： Venkata Lakshmi Borra Prasanta Jana PPSahoo Prakash Venkatesan Mehmet Ali recai Onal Chenna rao Borra Department of Metallurgical and Materials Engineering Indian Institute of Technology KharagpurWest Bengal721302India R&D Tata Steel Ltd.Jamshedpur831001India Department of Materials Engineering Synthesis and Recycling(4MAT)Universite Libre de BruxellesCP165/631050BrusselsBelgium GenoMines 630 Rue Noetzlin91190ParisFrance

rare earth elements(rEEs)play a crucial role in many technologies from daily appliances in cell phones to more advanced wind turbines and electric *** magnets account for a quarter of total global rEEs production and have high recycling *** this study,smelting process was used to selectively oxidize rEEs in the permanent magnets by adding Fe_(2)O_(3).This separates rEEs into a slag phase from an iron-rich metallic phase.B_(2)O_(3) was also added to the system as a flux to lower the slag melting *** minimizes rEEs loss to the metallic phase and allows a more efficient phase *** effect of flux and oxidizing agent addition was investigated on both regular and cerium-rich NdFeB(NdCeFeB)*** 1350℃and for 1 h,the slag phase was successfully separated from the metallic phase with the addition of 0.8 stoichiometric amount of Fe_(2)O_(3) and 40 wt%of B_(2)O_(3).Scanning electron microscopy-energy dispersive X-ray spectroscopy(SEM-EdX)analysis reveals that rEEs in the magnet do not migrate to the metal phase while the rEE-rich slag phase contains almost no *** the selective removal of iron into the metallic phase,rEEs are recovered from the slag phase through an acid leaching process allowing>99%of rEEs *** in the magnet can also be recovered as useful boric acid by evaporation and crystallisation *** proposed process in this study is reagent and energy-efficient with almost complete valorisation of both NdCeFeB and NdFeB magnets.

关键词： recycling rare earth elements NdFeBmagnets Smelting Leaching

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dolomitization Model of Pelletoid of Arab C Formation in Southern Arabian Gulf 84

Dolomitization Model of Pelletoid of Arab C Formation in Sou...

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84th EAGE Annual Conference and Exhibition

作者： Li, F. Ye, Y. Li, L. Wan, Y. Research Institute of Petroleum Exploration and Development Petrochina China CNPC Engineering Technology R&D Company Limited China

ISBN: (纸本)9781713884156

dolomitization is the main geological process that turn pelletoid into dolomites. How does dolomitization convert pelletoid into dolomites? Why do dolomites have different structures and crystals? This paper mainly answers these two questions. Based on core, cast thin sections, physical property and mercury intrusion, the Pelletoid types are first determined. Secondly, the diagenesis of the Pelletoid is comprehensively recognized, including the diagenetic types, diagenetic environment and diagenetic product. Finally, the dolomitization model of Pelletoid is established. There are four types dolomite in Arab C formation in BH oilfield. The Arab C Formation was in a tidal flat environment, in which facies include supratidal, intertidal and subtidal. different facies have different water energy, lithology, exposure probability and time, as a result, the diagenesis such as gypsification, dolomitization, dissolution and cementation in different area vary greatly. That’s why there are four type of dolomite even the primitive particles are the same pelletoids. The pelletoids were mainly in the intertidal facies, subtidal facies with relatively high energy could also developed. Intertidal facies was easy to exposure, and gypsification and dolomitization was intense in penecontemporaneous stage. due to the environment difference, response to sea level fluctuation and exposure time, the diagenesis, especially the extent of dolomitazition is different. As a result, the dolomite has different character in structure and crystal. © (2023) by the European Association of Geoscientists & Engineers (EAGE). All rights reserved.

关键词： dolomite

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Using multiple regression analysis to predict directionally solidified TiAl mechanical property

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Journal of materials Science & technology 2022年第9期104卷 285-291页

作者： Seungmi Kwak Jaehwang Kim Hongsheng ding Xuesong Xu ruirun Chen Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Carbon Materials Application R&D Group Korea Institute of Industrial TechnologyJeonju 54853 Republic of Korea

The mechanical properties of TiAl alloy prepared by directional solidification were predicted through a machine learning algorithm *** composition,input power,and pulling speed were designated as input variables as representative factors influencing mechanical properties,and multiple linear regression analysis was conducted by collecting data obtained from the *** this study,the r^(2)value of the tensile strength prediction result was 0.7159,elongation was 0.8459,nanoindentation hardness was 0.7573,and interlamellar spacing was *** the r^(2)value of the elongation obtained through the analysis was higher than the r^(2)value of the tensile strength,it was confirmed that the elongation had a closer relationship with the input variables(composition,input power,pulling speed)than the tensile *** adding the elongation to the tensile strength as an input variable,it was observed that the r^(2)value was further *** tensile test prediction results were divided into four groups:The group with the lowest residual value(predicted value-actual value)was designated as group A,and the group with the largest residual value was designated as group *** comparing the values of group A and group d,more overpredictions occurred in group A,while more under predictions occurred in group *** the residuals and r^(2)values,the cause of the well-prediction was studied,and through this,the relationship between the mechanical properties and the microstructure was quantitatively investigated.

关键词： directionally solidified TiAl alloy Microstructure control Tensile strength Interlamellar space Prediction Multiple linear regression

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VALIdATION OF A HEAdSPACE GAS CHrOMATOGrAPHY METHOd FOr VOLATILE rESIdUAL SOLVENTS IdENTIFICATION IN rAdIOPHArMACEUTICALS

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UPB Scientific Bulletin, Series B: Chemistry and materials Science 2024年第4期2024卷 119-130页

作者： Tudoroiu-Cornoiu, Maria-roxana Chilug, Elena Livia Ion, Ion Niculae, dana Doctoral School of Applied Chemistry and Materials Science Faculty of Chemical Engineering and Biotechnologies National University of Science and Technology POLITEHNICA Bucharest Romania Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering Măgurele Romania

The following study presents the development and validation of a headspace gas chromatography (HS-GC) analytical method for determining five residual solvents, frequently encountered in radioactive drugs. Measurement of residual solvents is a critical step in the testing and release of pharmaceutical products. The method demonstrated high accuracy and precision, being specific and fast, under the regulations of the European Pharmacopoeia. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Gas chromatography

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droplet morphology analysis of drop-on-demand inkjet printing

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China Foundry 2024年第1期21卷 20-28页

作者： Hu-xiang Xia Takechi Kensuke Tajima Shin Kawamura Yoshiumi Qing-yan Xu Key Laboratory for Advanced Materials Processing Technology(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Toyota Central R&D Labs. Inc.41-1 Yokomichi NagakuteAichi 480-1192Japan Frontier Research Center Toyota Motor Corporation1 Toyota-ChoToyotaAichi 471-8572Japan

As an accurate 2d/3d fabrication tool,inkjet printing technology has great potential in preparation of micro electronic *** morphology of droplets produced by the inkjet printer has a great impact on the accuracy of *** this study,the drop-on-demand(dod)inkjet simulation model was established,and the accuracy of the simulation model was verified by corresponding *** simulation result shows that the velocity of the droplet front and tail,as well as the time to disconnect from the nozzle is mainly affected by density(ρ),viscosity(μ)and surface tension(σ)of *** the liquid filament is about to disconnect from the nozzle,the filament length and filament front velocity are found to have a linear correlation withσ/ρμand ln(ρ/(μσ1/2)).

关键词： microdevice fabrication inkjet printing droplet morphology modeling and simulation

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