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Imaging and Understanding 3D Nanoscale Magnetic Structures

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1398-1399页

作者： Petford-Long, Amanda K. Brajuskovic, Vuk Li, Yue McCray, Arthur R C Phatak, Charudatta Materials Science Division Argonne National Laboratory Lemont IL United States Materials Science and Engineering Department Northwestern University Evanston IL United States Applied Physics Program Northwestern University Evanston IL United States

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Mechanical and Corrosion Behavior of a Biomedical Mg–6Zn–0.5Zr Alloy Containing a Large Number of Twins

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Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 439-455页

作者： Chang‑Jian Yan Bo Guan Yun‑Chang Xin Ling‑Yu Zhao Guang‑Jie Huang Rui Hong Xiao‑Bo Chen Paul K.Chu Institute of Corrosion Science and Technology Guangdong 510070China International Joint Laboratory for Light Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400030China Key Laboratory for Light‑Weight Materials Nanjing Tech UniversityNanjing 210009China School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China School of Engineering RMIT UniversityCarlton 3053VICAustralia Department of Physics Department of Materials Science&EngineeringDepartment of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloonHong KongChina Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The strong texture of Mg alloys can lead to strong tension–compression yield asymmetry and corrosion anisotropy,and this will consequently affect the effectiveness of hard tissue implants.A biomedical Mg–6Zn–0.5Zr alloy containing a large number of{1012}primary twins and{1012}–{1012}secondary twins is successfully prepared by cross *** dual twin structure not only removes the tension–compression yield asymmetry completely,but effectively reduces the corrosion anisotropy without compromise of corrosion *** difference between the largest corrosion rate and smallest one is~1.2 times compared to~1.6 times of the original *** is found that the reduced corrosion anisotropy is related to re-distribution of crystallographic orientations by twins.

关键词： Biomedical Mg alloy Corrosion Mechanical anisotropy Texture Twins

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Unconventional fieldlike spin torques in CrPt3

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Physical Review Applied 2024年第4期22卷 044043页

作者： Robin Klause Yuxuan Xiao Jonathan Gibbons Vivek P. Amin Kirill D. Belashchenko Dongwook Go Eric E. Fullerton Axel Hoffmann Department of Materials Science and Engineering and Materials Research Laboratory Center for Memory and Recording Research Department of Physics Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience Institute of Physics

The topological semimetal CrPt3 has potential for generating unconventional spin torques due to its ferrimagnetic ordering, topological band structure, and high anomalous Hall effect. CrPt3 exhibits ferrimagnetic behavior only in its chemically ordered phase and is paramagnetic in its chemically disordered phase. By controlling the growth and annealing temperatures, we prepare epitaxial films of both chemically ordered and chemically disordered phases of CrPt3, allowing us to investigate the effect of magnetic ordering on unconventional-torque generation. We use angle-dependent spin-torque-ferromagnetic-resonance and second-harmonic Hall measurements to probe the spin torques generated from epitaxial CrPt3 in CrPt3/Cu/Ni81Fe19 heterostructures. With current applied along specific directions with respect to the crystal order, we reveal unconventional spin torques in both ordered and disordered films. When current flows parallel to the [11¯1] and [1¯11] directions, we observe an unconventional fieldlike torque that is opposite in sign for the two directions. Our calculations reveal that this unconventional torque originates from an indirect nonlocal spin-orbit torque due to spin scattering at the CrPt3/Cu interface, in addition to symmetry breaking at this interface.

关键词： Electrical generation of spin carriers Spin current Spin polarization Spin-orbit torque Semimetals Topological materials Transition metal alloys Ferromagnetic resonance

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Dynamics of self-hybridized exciton–polaritons in 2D halide perovskites

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Light(science & Applications) 2024年第1期13卷 13-22页

作者： Surendra B.Anantharaman Jason Lynch Christopher E.Stevens Christopher Munley Chentao Li Jin Hou Hao Zhang Andrew Torma Thomas Darlington Francis Coen Kevin Li Arka Majumdar PJames Schuck Aditya Mohite Hayk Harutyunyan Joshua R.Hendrickson Deep Jariwala Department of Electrical and Systems Engineering University of PennsylvaniaPhiladelphiaPA19104USA KBR Inc. BeavercreekOH45431USA Air Force Research Laboratory Sensors DirectorateWright-Patterson Air Force BaseOH45433USA Department of Physics University of WashingtonSeattleWA98195USA Department of Physics Emory UniversityAtlantaGA30322USA Department of Chemical and Biomolecular Engineering Rice UniversityHoustonTX77005USA Department of Materials Science and Nanoengineering Rice UniversityHoustonTX77005USA Applied Physics Program Smalley‐Curl InstituteRice UniversityHoustonTX77005USA Department of Mechanical Engineering Columbia UniversityNew YorkNY10027USA Department of Electrical and Computer Engineering University of WashingtonSeattleWA98195USA

Excitons,bound electron–hole pairs,in two-dimensional hybrid organic inorganic perovskites(2D HOIPs)are capable of forming hybrid light-matter states known as exciton-polaritons(E–Ps)when the excitonic medium is confined in an optical *** the case of 2D HOIPs,they can self-hybridize into E–Ps at specific thicknesses of the HOIP crystals that form a resonant optical cavity with the ***,the fundamental properties of these self-hybridized E–Ps in 2D HOIPs,including their role in ultrafast energy and/or charge transfer at interfaces,remain ***,we demonstrate that>0.5µm thick 2D HOIP crystals on Au substrates are capable of supporting multiple-orders of self-hybridized E–P *** E–Ps have high Q factors(>100)and modulate the optical dispersion for the crystal to enhance sub-gap absorption and *** varying excitation energy and ultrafast measurements,we also confirm energy transfer from higher energy E–Ps to lower energy E–***,we also demonstrate that E–Ps are capable of charge transport and transfer at *** findings provide new insights into charge and energy transfer in E–Ps opening new opportunities towards their manipulation for polaritonic devices.

关键词： charge polar excitation

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Transport performance of a dimer in inertial frictional ratchets

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Communications in Theoretical physics 2024年第12期76卷 155-165页

作者： Li-Ming Fan Bao-quan Ai Jin-can Chen Tian-fu Gao Zhi-gang Zheng College of Physical Science and Technology Shenyang Normal UniversityShenyang 110034China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China Department of Physics Xiamen UniversityXiamen 361005China Institute of Systems Science(ISS) Huaqiao UniversityXiamen 361021China College of Information Science and Engineering Huaqiao UniversityXiamen 361021China

This investigation focuses on the under-damped Brownian transport of a dimer characterized by two harmonically interacting *** friction coefficients between the dimer components are different;thus the dynamic symmetry of the system is *** addition,the inertial ratchets are synchronously modulated by the feedback control protocol in ***,we analyze the transport performance by studying the average velocity and energy conversion efficiency of the dimer induced by friction symmetry breaking and external ***,we can also identify the enhancement of the centre-of-mass mean velocity and energy conversion efficiency of inertial frictional ratchets for intermediate values of the driving amplitude,coupling strength and damping ***,in the weak bias case,the directed transport of inertial Brownian particles can be reversed twice by modulating the suitable friction of the *** particular,the frictional ratchets can acquire a series of resonant steps under the influence of harmonic *** conclusions of reliable transport in noisy environments are expected to provide insights into the performance of natural molecular motors.

关键词： frictional ratchets stochastic energetics theory transport performance energy conversion efficiency

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High-entropy metallic ceramics with quaternary MAX phases: Stability and mechanical properties of (Me0.251Me0.252Me0.253Me0.254)2AlC

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Ceramics International 2025年第7期51卷 8465-8471页

作者： Liu, Shi-Yu Zhang, Chi Zhang, Huilun Gong, Weiping Liu, Shiyang Li, Dejun Liu, Yanyu Li, Yaping Wang, Sanwu College of Physics and Materials Science Tianjin Normal University Tianjin300387 China Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou University Huizhou516007 China Institute of Information Optics Zhejiang Normal University Jinhua Zhejiang321004 China Department of Physics Farmingdale State College FarmingdaleNY11735 United States Department of Physics and Engineering Physics The University of Tulsa Tulsa OK74104 United States

First-principles density-functional calculations are employed to study the stability and mechanical properties of fifteen high-entropy quaternary MAX phases, (Me0.251Me0.252Me0.253Me0.254)2AlC, consisting of any four early transition metals in Groups IVB and VB (Ti, Zr, Hf, V, Mb, and Ta), Al, and C. Our calculations of the enthalpy, entropy, and Gibbs free energy of mixing show that all fifteen phases are thermodynamically stable. This result is also consistent with an empirical rule based on the lattice size difference. While two of these quaternary MAX phases, (Ti0.25Zr0.25Nb0.25Ta0.25)2AlC and (Ti0.25V0.25Nb0.25Ta0.25)2AlC, have been experimentally synthesized, our calculations suggest the possibility of synthesis of other thirteen single-phase metallic ceramics with a quaternary MAX phase. All these materials are found to have high hardness and improved fracture toughness. In particular, (Ti0.25Hf0.25V0.25Ta0.25)2AlC is predicted to have the highest Vicker hardness, fracture toughness, and melting point. © 2024

关键词： Fracture toughness

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Synthesis and Characterization of Perovskite Oxide Reinforced Polymer Nanocomposites

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 1825-1826页

作者： McClain, Starfari T. Murray, Thomas Harry, Richard I. Shrivastava, Navadeep Ede, Sivasankara Rao Zainuddin, Shaik Luo, Zhiping Department of Chemistry Physics and Materials Science Fayetteville State University Fayetteville NC United States Department of Materials Science and Engineering Tuskegee University Tuskegee AL United States

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Nitrogen-Doped Amorphous Carbon Homojunction from Palmyra Sugar as a Renewable Solar Cell

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Journal of Renewable materials 2024年第1期12卷 57-69页

作者： Budhi Priyanto Imam Khambali Irma Septi Ardiani Khoirotun Nadhiyah Anna Zakiyatul Laila M.Chasrun Hasani Bima Romadhon Retno Asih Yoyok Cahyono Triwikantoro Darminto Department of Electronic Engineering Faculty of EngineeringUniversitas Muhammadiyah MalangKota MalangIndonesia Advanced Materials Research Group Department of PhysicsFaculty of Science and Data AnalyticsInstitut Teknologi Sepuluh NopemberSurabayaIndonesia Department of Electronic Engineering Faculty of Industrials EngineeringInstitut Teknologi National MalangKota MalangIndonesia

An a-C/a-C:N junction,which used palmyra sugar as the carbon source and ammonium hydroxide(NH4OH)as the dopant source,was successfully deposited on the ITO glass substrate using the nano-spraying *** current-voltage relationship of the junction was found to be a Schottky-like contact,and therefore the junction shows the characteristic *** means the a-C and a-C:N are semiconductors with different types of ***,the samples showed an increase in current and voltage value when exposed to visible light(bright state)compared to the dark condition,thereby,indicating the creation of electron-hole pairs during the *** was also discovered that the relationship between current and voltage for the a-C/a-C:N junction sample formed a curve that satisfies the rule of the photovoltaic effect when exposed to visible light from a light *** exposure of this sample to direct sunlight at AM 1.5 conditions produced a curve that meets the rules for the emergence of the photovoltaic effect with higher characteristics for the current-voltage ***,the a-C/a-C:N junction sample is a solar cell successfully fabricated using a sample method and has a maximum efficiency of 0.0013%.

关键词： Solar cell amorphous carbon palmyra sugar

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Autocatalytic reduction-assisted synthesis of segmented porous PtTe nanochains for enhancing methanol oxidation reaction

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Nano Research Energy 2023年第1期2卷 140-147页

作者： Qiqi Zhang Tianyu Xia He Huang Jialong Liu Mengyuan Zhu Hao Yu Weifeng Xu Yuping Huo Congli He Shipeng Shen Cong Lu Rongming Wang Shouguo Wang Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China Key Laboratory of Materials Physics of the Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Physics and Electronics School of Mathematics and PhysicsBeijing University of Chemical TechnologyBeijing 100029China Synchrotron Radiation Research Center Hyogo Science and Technology AssociationTatsuno 6795165Japan Institute for Multidisciplinary Innovation University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Anhui UniversityHefei 230601China

Morphology engineering has been developed as one of the most widely used strategies for improving the performance of ***,the harsh reaction conditions and cumbersome reaction steps during the nanomaterials synthesis still limit their industrial ***,one-dimensional(1D)novel-segmented PtTe porous nanochains(PNCs)were successfully synthesized by the template methods assisted by Pt autocatalytic *** PtTe PNCs consist of consecutive mesoporous architectures that provide a large electrochemical surface area(ECSA)and abundant active sites to enhance methanol oxidation reaction(MOR).Furthermore,1D nanostructure as a robust sustaining frame can maintain a high mass/charge transfer rate in a long-term durability *** 2,000 cyclic voltammetry(CV)cycles,the ECSA value of PtTe PNCs remained as high as 44.47 m^(2)·gPt^(-1),which was much larger than that of commercial Pt/C(3.95 m^(2)·gPt^(-1)).The high catalytic activity and durability of PtTe PNCs are also supported by CO stripping test and density functional theory *** autocatalytic reduction-assisted synthesis provides new insights for designing efficient low-dimensional nanocatalysts.

关键词： autocatalytic process PtTe catalysts methanol oxidation reactions porous nanochain

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Anomalous thermal expansion and enhanced magnetocaloric effect in<001>-textured Mn_(x)Fe_(5-x)Si_(3) alloys

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Rare Metals 2024年第5期43卷 2263-2274页

作者： Yong Gong Xue-Fei Miao Tapas Samanta Chris Taake Jun Liu Feng-Jiao Qian Yan-Yan Shao Yu-Jing Zhang Qing-Yong Ren Luana Caron Feng Xu MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094China Department of Physics Bielefeld University33501BielefeldGermany College of Physics Nanjing University of Aeronautics and AstronauticsNanjing210016China Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Spallation Neutron Source Science Center Dongguan523803China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan523803China Department of Physics Bielefeld University33501BielefeldGermany Helmholtz-Zentrum Berlin für Materialien und Energie12489BerlinGermany

The development of zero and negative therma expansion(i.e.,ZTE and NTE)materials is of crucial importance to the control of undesirable thermal expansion for high-precision *** the present work,ZTE and NTE were obtained in directionally-solidified Mn_(x)Fe_(5-x)Si_(3)alloys with a strong<001>texture,in striking contrast to positive thermal expansion in their isotropic counterparts Magnetometry and in-situ X-ray diffraction(XRD)measurements were performed to uncover the origin of the anomalous thermal *** measurements indicate a strong easy-plane magnetocrystalline anisotropy in the textured samples,where the magnetic moments are aligned within the ab plane of the hexagonal structure Temperature-dependent XRD on the x=1 sample reveals a ZTE character in the ab plane that is coupled to a ferromagnetic *** a result,the macroscopic ZTE(~0.22×10^(-6)K^(-1))in the x=1 sample can be attributed to the microscopic magneto volume effect within the ab plane,which is realized by the introduction of the<001>-textured ***,the competition between antiferromagnetic and ferromagnetic exchange coupling leads to NTE in textured x=1.5 and 2 ***,textured x=1 sample displays enhanced magnetocaloric properties as compared to the conventional counterparts with randomly-oriented *** this work demonstrates a new strategy toward the exploration of anomalous thermal expansion properties as well as the enhancement of magnetocaloric properties for materials with a strong magnetocrystalline anisotropy.

关键词： MnFeySis Magnetocaloric effect Magnetic phase transition Negative thermal expansion

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