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Room-temperature van der Waals magnetoresistive memories with data writing by orbital current in the Weyl semimetal TaIrTe4

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Physical Review B 2024年第3期110卷 035423-035423页

作者： Dong Li Xing-Yu Liu Zhen-Cun Pan An-Qi Wang Jiantian Zhang Peng Yu Zhi-Min Liao State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Academy for Advanced Interdisciplinary Studies State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and Engineering Hefei National Laboratory Hefei 230088 China

Current-induced out of plane magnetization has been utilized for field-free switching of ferromagnets with perpendicular magnetic anisotropy. Identifying systems capable of energy-efficiently converting charge currents into out of plane orbit- or spin-polarized currents is crucial for advancing magnetic memory technologies. Here we introduce the Berry curvature dipole as a key evaluation factor, directly measurable through nonlinear Hall effects. In the Weyl semimetal TaIrTe4 used in our experiments, applying a current parallel to the Berry curvature dipole results in out of plane orbital magnetization, which governs the field-free perpendicular magnetization switching in TaIrTe4/Fe3GaTe2 heterostructures. Notably, all-electric control of van der Waals magnetoresistive memory at room temperature has been achieved with a low critical current density ∼2×106A/cm2 for data writing. Our findings reveal the connection between nonlinear Hall effects and field-free magnetization switching, highlighting the potential of the Berry curvature dipole in advancing orbitronics.

关键词： Geometric & topological phases Spin torque Spintronics Weyl semimetal

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Orbital anomalous Hall effect in the few-layer Weyl semimetal TaIrTe4

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Physical Review B 2024年第15期110卷 155434页

作者： An-Qi Wang Dong Li Tong-Yang Zhao Xing-Yu Liu Jiantian Zhang Xin Liao Qing Yin Zhen-Cun Pan Peng Yu Zhi-Min Liao State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Academy for Advanced Interdisciplinary Studies State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and Engineering Hefei National Laboratory Hefei 230088 China

We report on the observation of the linear anomalous Hall effect (AHE) in the nonmagnetic Weyl semimetal TaIrTe4. This is achieved by applying a direct current Idc and an alternating current Iω (Iω≪Idc) in TaIrTe4, where the former induces time-reversal symmetry breaking and the latter probes the triggered AHE. The anomalous Hall resistance VHω/Iω shows a linear dependence on Idc and changes sign with the polarity of Idc. In temperature-dependent measurements, VHω/Iω also experiences a sign reversal at ∼100 K, consistent with the temperature-dependent nonlinear Hall effect (NLHE). Furthermore, in measurements involving only dc transport, the dc Hall voltage exhibits a quadratic relationship with Idc. When the Idc direction is reversed, the Hall resistance changes sign, demonstrating a colossal nonreciprocal Hall effect (NRHE). Our theoretical calculations suggest that the observed linear AHE, NLHE, and NRHE all dominantly originate from the current-induced orbital magnetization compared to the minor spin contribution. This work provides deep insights into the orbital magnetoelectric effect and nonlinear Hall response, promising precise electric control of out-of-plane polarized orbit flow.

关键词： Hall effect Topological materials Transport phenomena Transport techniques

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An enzyme-free interdigitated electrode for ketamine detection

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Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A 2023年第5期46卷 441-452页

作者： Phan, Thien Luan Van Hieu, Nguyen Lin, Jing-Jenn Wu, Hsing-Ju Chu, Pei-Yi Hsiao, Chin-Sung Yao, Fiona Yan-Dong Lin, Yung-Kai Ching, Congo Tak Shing Graduate Institute of Biomedical Engineering National Chung Hsing University Taichung Taiwan Viet Nam Department of Applied Materials and Optoelectronic Engineering National Chi Nan University Taiwan Research Assistant Center Show Chwan Memorial Hospital Taiwan Department of Medical Research Chang Bing Show Chwan Memorial Hospital Taiwan Department of Pathology Show Chwan Memorial Hospital Taiwan School of Medicine College of Medicine Fu Jen Catholic University Taiwan Computer Science and Information Engineering Asia University Taiwan Division of Science Engineering and Health Studies College of Professional and Continuing Education The Hong Kong Polytechnic University Hong Kong Department of Food Science National Taiwan Ocean University Taiwan Department of Electrical Engineering National Chi Nan University Nantou County Taiwan

Ketamine is an anesthetic, which when used wrongly would affect judgment and behavior, increasing risks to individual such as unwanted or risky sexual behavior. This study reports the development of an admittance- and capacitance-spectroscopy-based sensor to detect ketamine in solution, such as whiskey, a popular alcoholic drink. The result confirms the proposed method is capable of detecting the presence of ketamine in whiskey, in concentration as low as 6.25 ng/μL, by using admittance and capacitance measured at 6.75 MHz, as well as quantifying the measured admittance (sensitivity: 300 μΩ−1/Log (ng/μL);limit of detection (LOD): 0.16 ng/μL) or capacitance data (sensitivity: 2 nF/Log (ng/μL);LOD: 0.73 ng/μL) at 18 kHz and 7.69 MHz, respectively. © 2023 The Chinese Institute of Engineers.

关键词： Capacitance

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When graphite meets Li metal

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National science Review 2020年第10期7卷 1521-1522页

作者： Yu Ding Guihua Yu Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at Austin

Wetting, indicating the ability of a liquid to spread out over solid surfaces,is of vital importance in addressing the scientific issues related to energy and environment technologies. The study of wetting encompasses the academic disciplines of surface chemistry, nanotechnology, materials science and energy *** past several decades have witnessed significant progress in achieving desirable wetting performance with water,

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Mass transport in a highly immiscible alloy on extended shear deformation

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Journal of materials science & Technology 2023年第3期134卷 197-208页

作者： Miao Song Jia Liu Xiaolong Ma Qin Pang Matthew J.Olszta Joshua Silverstein Madhusudhan R.Pallaka Peter V.Sushko Suveen N.Mathaudhu Cynthia Powell Arun Devaraj Bharat Gwalani Physical and Computational Sciences Directorate Pacific Northwest National Laboratory902 Battelle BoulevardRichlandWA 99354USA Energy and Environmental Directorate Pacific Northwest National Laboratory902 Battelle BoulevardRichlandWA 99354USA Material Science and Engineering Program University of CaliforniaRiversideCA92521USA Colorado School of Mines 1500 Illinois St.GoldenCO 8040USA Department of Materials Science and Engineering North Carolina State UniversityRaleighNC27695-7907USA State Key Laboratory of Powder Metallurgy Central South Uni-versityChangsha 410083China

Forced mixing to a single-phase or supersaturated solid solution(SSS)and its prerequisite microstructure evolution in immiscible systems has been a focus of research for fundamental science and practical *** the formation of SSS by shear deformation could enable a material design beyond conventional equilibrium microstructure in immiscible ***,a highly immiscible Cu-50 at.%Cr binary alloy(mixing enthalpy of∼20 kJ mol^(−1))was employed to investigate the microstructure evolution and localized tendencies of SSS during severe shear *** results demonstrate the dislocation mediated microstructural refinement process in each phase of the binary alloy and the mechanisms associated with localized solute supersaturation as a function of shear *** grain refinement in the softer Cu phase occurs owing to the strain localization driving the preferential dynamic *** grain refinement of the Cr phase,however,is enabled by the progressive evolution of grain lamination,splitting,and fragmentation as a function of shear *** solute supersaturation is found to be strongly dependent on the local environments that affect the dislocation activity,including the level of microstructure refinement,the interfacial orientation relationship,the mechanical incompatibility,and the localized preferential phase *** initio simulations confirm that it is more favorable to oxidize Cr than Cu at incoherent Cu/Cr interfaces,limiting the mass transport on an incoherent *** results unveil the mechanism underpinning the non-equilibrium mass transport in immiscible systems upon severe deformation that can be applied to produce immiscible alloys with superior mechanical properties.

关键词： Tribology Immiscible alloys Nanostructures Shear deformation Forced mixing Atom probe

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Synthesis and characterization of chicken feather derived rachis fiber-bamboo particulate hybrid reinforced epoxy composites for sustainable structural applications

Journal of Responsible Production and Consumption

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Journal of Responsible Production and Consumption 2024年第1期1卷 1-17页

作者： Isiaka Oluwole Oladele Omoye Oseyomon Odemilin Samson Oluwagbenga Adelani Anuoluwapo Samuel Taiwo Olajesu Favor Olanrewaju Department of Metallurgical and Materials Engineering Federal University of Technology Akure Akure Nigeria and Department of Chemical and Mining Engineering University of Johannesburg Johannesburg South Africa Department of Metallurgical and Materials Engineering Federal University of Technology Akure Akure Nigeria Department of Materials Science and Engineering Program University of Colorado at Boulder Boulder Colorado USA Department of School of Aerospace Transport and Manufacturing School of Aerospace Transport and Manufacturing Cranfield University Cranfield UK Department of Materials Science and Engineering Iowa State University Ames Iowa USA

Purpose This paper aims to reduce waste management and generate wealth by investigating the novelty of combining chicken feather fiber and bamboo particles to produce hybrid biocomposites. This is part of responsible production and sustainability techniques for sustainable development goals. This study aims to broaden animal and plant fiber utilization in the sustainable production of epoxy resins for engineering applications. Design/methodology/approach This research used two reinforcing materials [chicken feather fiber (CFF) and bamboo particles (BP)] to reinforce epoxy resin. The BPs were kept constant at 6 Wt.%, while the CFF was varied within 3–15 Wt.% in the composites to make CFF-BP polymer-reinforced composite (CFF-BP PRC). The mechanical experiment showed a 21% reduction in densities, making the CFF-BP PRC an excellent choice for lightweight applications. Findings It was discovered that fabricated composites with 10 mm CFF length had improved properties compared with the 15 mm CFF length and pristine samples, which confirmed that short fibers are better at enhancing randomly dispersed fibers in the epoxy matrix. However, the ballistic properties of both samples matched. There is a 40% increase in tensile strength and a 54% increase in flexural strength of the CFF-BP PRC compared to the pristine sample. Originality/value According to the literature review, to the best of the authors’ knowledge, this is a novel study of chicken fiber and bamboo particles in reinforcing epoxy composite.

关键词： Green composite Sustainability Rachis fiber Bamboo particles Clean environment

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Designing a Novel Low-Density, High-Strength Ti27.5zr26.5nb25.5ta8.5al12 Refractory High-Entropy Alloy for High-Temperature Applications

SSRN

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SSRN 2024年

作者： Naseer, Hashim Wang, Yangwei Bao, Jiawei Khan, Muhammad Abubaker Afifi, Mohamed A. School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China Tangshan Research Institute Beijing Institute of Technology Tangshan063000 China Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Mechanical Engineering Program School of Engineering and Applied Sciences Nile University Giza12677 Egypt

This study introduces a novel Refractory High-Entropy Alloy (RHEA) with the composition Ti27.5Zr26.5Nb25.5Ta8.5Al12, designed for high-temperature structural applications while addressing the limitations of traditional nickel-based superalloys. The alloy was synthesized using vacuum arc melting and characterized through comprehensive experimental methods including X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). This RHEA demonstrated exceptional mechanical properties, achieving a yield strength of 1356 MPa and a specific yield strength of 197.3 MPa·g⁻¹·cm³ at room temperature, with notable ductility (compressive strain >50%) across a wide temperature range up to 1000°C. The microstructural analysis revealed a two-phase BCC/B2 nanodomain structure that contributes significantly to its strength and ductility. This structure was further refined through controlled thermomechanical treatments, eliminating the need for additional heat treatment. The findings suggest that the Ti27.5Zr26.5Nb25.5Ta8.5Al12 RHEA holds great potential as a low-density, high-performance material for demanding environments, offering a viable alternative to heavier superalloys. © 2024, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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Hierarchical mesoporous S,N-codoped carbon nanostructures composed of Co/Co-Cu-S/carbon nanoplate arrays on carbon nanofibers as a self-supported air cathode for long-lasting rechargeable Zn-air batteries

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science China(Technological sciences) 2022年第3期65卷 693-703页

作者： XU ZhuYing YAN Lei SHEN JunLing YANG XiaoJing NING JiQiang ZHONG YiJun HU Yong Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Department of ChemistryZhejiang Normal UniversityJinhua 321004China Department of Optical Science and Engineering Fudan UniversityShanghai 200438China Hangzhou Institute of Advanced Studies Zhejiang Normal UniversityHangzhou 311231China

One of the primary roadblocks to widespread applications of rechargeable Zn-air batteries is the durability issue with oxygen reduction and evolution processes(ORR/OER)bifunctional *** herein report the construction of a selfsupported air cathode for Zn-air batteries made of S,N-codoped porous complex carbon nanostructures of Co/Co-Cu-S/carbon nanoplate arrays and carbon nanofibers(denoted as Co/Co-Cu-S@SNPCP-CFs).The hierarchical heteroatom-doped mesoporous carbon nanohybrids with multiple active species not only provide a high surface-to-volume ratio,exposing more catalytic sites and accelerating the charge and mass transfer,but also boost the activity and *** Co/Co-Cu-S@SNPCP-CFs catalyst reveals a small potential gap(ΔE=0.67 V)between the half-wave potential of ORR and OER potential at 10 m A ccm^(-2),demonstrating outstanding bifunctional ***,the rechargeable Zn-air battery made with the as-obtained electrocatalyst exhibits a high-power density of 220 m W cm^(-2)and a long cycling time of over 800 h at 10 m A ccm^(-2),and the flexible solid-state rechargeable Zn-air battery based on Co/Co-Cu-S@SNPCP-CFs self-supporting air cathode also displays a long duration time of over 60 h.

关键词： Co Co-Cu-S carbon bifunctional electrocatalyst rechargeable Zn-air batteries

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Coupling of mechanical deformation and electromagnetic fields in biological cells

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Reviews of Modern Physics 2022年第2期94卷 025003-025003页

作者： Mehdi Torbati Kosar Mozaffari Liping Liu Pradeep Sharma Departments of Mechanical Engineering Physics and the Materials Science and Engineering Program University of Houston Houston Texas 77204 USA

The cell, as the most fundamental unit of life, is a microcosm of biology in which the confluence of nearly all aspects of classical physics (mechanics, statistical physics, condensed matter, and electromagnetism) plays out. This leads to a rich and complex emergent behavior that determines the entire gamut of biological functions. Specifically, at the cellular scale, mechanical forces and deformations are inextricably linked to electrical fields (and, to a lesser degree, magnetic fields). This in turn is responsible for phenomenology such as cell-cell communication, morphological evolution, cell fusion, self-assembly, cell fission, magnetoreception, endocytosis, and adhesion, among others. From the viewpoint of biomedicine, cellular response to the combined influence of electrical, magnetic, and mechanical fields has applications in cancer treatment, targeted transfer of medicine, gene therapy, and wound amelioration. As an example of the profound influence of the combined electrical-mechanical coupling, one needs to take cognizance only of the operation of ion channels that form the basis for our sensing system (such as hearing, sight, and tactile sense). The coupled mechanical and electromagnetic behavior of a cell is a highly interdisciplinary endeavor and this review provides a distillation of both the theoretical underpinnings of the subject and the pertinent biological interpretation. The key developments pertaining to this topic are reviewed, a unified mathematical framework that couples nonlinear deformation and electromagnetic behavior as germane for soft biological entities is summarized, gaps in current knowledge are pointed out, and the central issues that are pertinent to future research are commented upon.

关键词： Electromagnetism Mechanical deformation

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Magneto-optical Kerr spectra of gold induced by spin accumulation

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Physical Review B 2022年第1期106卷 014410-014410页

作者： Víctor H. Ortiz Sinisa Coh Richard B. Wilson Department of Mechanical Engineering and Materials Science and Engineering Program University of California Riverside 92521 CA United States

We report the magneto-optic Kerr effect (MOKE) angle of Au magnetically excited by spin accumulation. We perform time-resolved polar MOKE measurements on Au/Co heterostructures. In our experiment, the ultrafast optical excitation of the Co drives spin accumulation into an adjacent Au layer. The spin accumulation, together with spin-orbit coupling, leads to nonzero terms in the off-diagonal conductivity tensor of Au, which we measure by recording the polarization and ellipticity of light reflected from the Au surface for photon energies between 1.3 and 3.1 eV. In a narrow energy range near the interband transition threshold of Au, the sensitivity to magnetization measured exceeds 1μradperA/m. In the photon energy interval of 0.6–4.4 eV, the maximum value for transition ferromagnetic metals like Ni are <10nradperA/m, while predicted values for heavy metals like Pt or W are <13nradperA/m. The exceptional sensitivity of the optical properties of Au to spin magnetic moments make Au an exceptionally sensitive optical magnetometer, with potential applications in the development of optospintronic technologies.

关键词： Density of states Magneto-optical Kerr effect Spin accumulation Ultrafast magnetic effects

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