检索结果-内蒙古大学图书馆

Exploring the Correlation Between Surface Roughness, Surface Energy, Nano-indentation, Electrical Properties, and Magnetic Characteristics of Annealed Co40Fe40Dy20 Thin Films Deposited on Si(100) Substrates

引用

Journal of Electronic materials 2024年第8期53卷 4498-4511页

作者： Liu, Wen-Jen Chang, Yung-Huang Hsu, Shuo-Ting Fern, Chi-Lon Chen, Yuan-Tsung Tsao, Shin-Ying Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

The impact of film thickness and annealing temperature on the structural, electrical, magnetic, and mechanical properties of cobalt–iron–dysprosium (Co40Fe40Dy20 ) thin films deposited on Si(100) substrates have been investigated. X-ray diffraction (XRD) analysis confirmed the film's crystalline microstructure, featuring dysprosium oxide, Dy2O3(440), and cobalt oxide, Co2O3(422) and Co2O3(511), crystallographic phases. Surface energy measurements indicated a noticeable reduction in surface energy following annealing treatments, which could be ascribed to the alleviation of residual stress and enhanced atomic arrangement, resulting in a more stable film structure with reduced surface energy. The film exhibited a decreasing trend in hardness with increasing thickness, and film resistivity was significantly responsive to alterations in thickness and annealing temperature. Notably, the Co40Fe40Dy20 film demonstrated exceptional characteristics, featuring a high saturation magnetization (Ms) of 675 emu/cm3 and a low coercivity (Hc) of 9.5 Oe. Further analysis of magnetic domains and hysteresis loops revealed that larger and brighter domains were associated with higher Hc. To sum up, the surface roughness of CoFeDy films under various annealing temperatures played a pivotal role in shaping their magnetic, electrical, adhesive, and optical characteristics. An improved low-frequency alternating current magnetic susceptibility (χac) value was achieved by minimizing the pinning effect on domain walls through surface smoothing. Moreover, smoother surfaces displayed heightened carrier conductivity, resulting in a decrease in electrical resistance. On the whole, Co40Fe40Dy20 films exhibited outstanding soft magnetic properties, encompassing high saturation magnetization, low coercivity, exceptional mechanical attributes, and decreased surface energy. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Magnetic susceptibility

来源：评论

学校读者我要写书评

暂无评论

Supercurrent through a single transverse mode in nanowire Josephson junctions

引用

Physical Review B 2025年第16期111卷 L161401-L161401页

作者： B. Zhang Z. Li H. Wu M. Pendharkar C. Dempsey J. S. Lee S. D. Harrington C. J. Palmstrøm S. M. Frolov Department of Physics and Astronomy University of Pittsburgh Pittsburgh Pennsylvania 15260 USA Department of Physics The Pennsylvania State University University Park Pennsylvania 16802 USA Electrical and Computer Engineering University of California Santa Barbara California 93106 USA Present address: Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA. California NanoSystems Institute University of California Santa Barbara Santa Barbara California 93106 USA Present address: Department of Physics and Astronomy University of Tennessee Knoxville TN 37996 USA. Materials Department University of California Santa Barbara Santa Barbara California 93106 USA

Hybrid superconductor-semiconductor materials are fueling research in mesoscopic physics and quantum technology. Recently demonstrated smooth β-Sn superconductor shells, due to the increased induced gap, are expanding the available parameter space to new regimes. Fabricated on quasiballistic InSb nanowires, with careful control over the hybrid interface, Sn shells yield measurable switching currents even when nanowire resistance is of order 10kΩ. In this regime Cooper pairs travel through a purely one-dimensional quantum wire for at least part of their trajectory. Here, we focus on the evolution of proximity-induced supercurrent in magnetic field parallel to the nanowire. Long decay up to fields of 1T is observed. At the same time, the decay for higher occupied subbands is notably faster in some devices but not in others. We analyze this using a tight-binding numerical model that includes the Zeeman, orbital, and spin-orbit effects. When the first subband is spin polarized, we observe a dramatic suppression of supercurrent, which is also confirmed by the model and suggests an absence of significant triplet supercurrent generation.

关键词： Nanowires

来源：评论

学校读者我要写书评

暂无评论

Terahertz phonon polariton concentrator based on perovskite oxides

Terahertz phonon polariton concentrator based on perovskite ...

引用

2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Xu, Rui Lin, Tong Luo, Jiaming Chen, Xiaotong Blackert, Elizabeth R. Moon, Alyssa R. JeBailey, Khalil M. Zhu, Hanyu Department of Materials Science and Nano Engineering Rice University Houston United States Applied Physics Graduate Program Rice University Houston United States Program Rice University Houston United States

ISBN: (纸本)9781957171258

We report the experimental demonstration of surface phonon-polaritonic devices in a broad spectral range of 7-13 THz based on SrTiO3. We designed planar ultrafast concentrators that amplifies transient electric field by 6 times and measured an average field of 0.5 GV/m in an optically resolvable area in the far field. © 2023 The Author(s)

关键词： Perovskite

来源：评论

学校读者我要写书评

暂无评论

A multiband NIR upconversion core-shell design for enhanced light harvesting of silicon solar cells

引用

Light(science & Applications) 2024年第12期13卷 3261-3271页

作者： Yue Wang Wen Xu Haichun Liu Yuhan Jing Donglei Zhou Yanan Ji Jerker Widengren Xue Bai Hongwei Song State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University130012 ChangchunChina Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission School of Physics and Materials EngineeringDalian Minzu UniversityDalian 116600China Department of Applied Physics KTH Royal Institute of TechnologySE-10691 StockholmSweden

Exploring lanthanide light upconversion(UC)has emerged as a promising strategy to enhance the near-infrared(NIR)responsive region of silicon solar cells(SSCs).However,its practical application under normal sunlight conditions has been hindered by the narrow NIR excitation bandwidth and the low UC efficiency of conventional ***,we report the design of an efficient multiband UC system based on Ln^(3+)/Yb^(3+)-doped core-shell upconversion nanoparticles(Ln/Yb-UCNPs,Ln^(3+)=Ho^(3+),Er^(3+),Tm^(3+)).In our design,Ln^(3+)ions are incorporated into distinct layers of Ln/Yb-UCNPs to function as near-infrared(NIR)absorbers across different spectral *** design achieves broad multiband absorption withtin the 1100 to 2200 nm range,with an aggregated bandwidth of~500 *** have identified a synthetic electron pumping(SEP)effect involving Yb^(3+)ions,facilitated by the synergistic interplay of energy transfer and cross-relaxation between Yb^(3+)and other ions Ln^(3+)(Ho^(3+),Er^(3+),Tm^(3+)).This SEP effect enhances the UC efficiency of the nanomaterials by effectively transferring electrons from the low-excited states of Ln^(3+)to the excited state of Yb^(3+),resulting in intense Yb^(3+)luminescence at~980 nm within the optimal response region for SSCs,thus markedly improving their overall *** SSCs integrated with Ln/Yb-UCNPs with multiband excitation demonstrate the largest reported NIR response range up to 2200 nm,while enabling the highest improvement in absolute photovoltaic efficiency reported,with an increase of 0.87%(resulting in a total efficiency of 19.37%)under standard AM 1.5 G *** work tackles the bottlenecks in UCNP-coupled SSCs and introduces a viable approach to extend the NIR response of SSCs.

关键词： excited excitation absorber

来源：评论

学校读者我要写书评

暂无评论

Higher-order topology in twisted multilayer systems:A review

引用

Chinese physics B 2025年第3期34卷 2-10页

作者： Chunbo Hua Dong-Hui Xu Key Laboratory of Artificial Micro-and Nanostructures of Ministry of Education and School of Physics and Technology Wuhan UniversityWuhan 430072China School of Electronic and Information Engineering Hubei University of Science and TechnologyXianning 437100China Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics Chongqing UniversityChongqing 400044China Center of Quantum Materials and Devices Chongqing UniversityChongqing 400044China

In recent years,there has been a surge of interest in higher-order topological phases(HOTPs)across various disciplines within the field of *** unique phases are characterized by their ability to harbor topological protected boundary states at lower-dimensional boundaries,a distinguishing feature that sets them apart from conventional topological phases and is attributed to the higher-order bulk-boundary ***-dimensional(2D)twisted systems offer an optimal platform for investigating HOTPs,owing to their strong controllability and experimental ***,we provide a comprehensive overview of the latest research advancements on HOTPs in 2D twisted multilayer *** will mainly review the HOTPs in electronic,magnonic,acoustic,photonic and mechanical twisted systems,and finally provide a perspective of this topic.

关键词： higher-order topology twisted multilayer systems van der Waals materials corner states

来源：评论

学校读者我要写书评

暂无评论

Photocatalytic activity enhancement with 4-trifluoromethylphenylacetylene-functionalized Cu2O cubes and rhombic dodecahedra from band structure modulation and use in boronic acid hydroxylation

引用

Journal of materials Chemistry A 2024年第9期12卷 5429-5438页

作者： Chien, Kuo-Chang Yu, Wei-Yang Kao, Jui-Cheng Lo, Yu-Chieh Chou, Jyh-Pin Huang, Michael H. Department of Chemistry National Tsing Hua University Hsinchu30013 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan Department of Physics National Changhua University of Education Changhua50007 Taiwan

Surface 4-trifluoromethylphenylacetylene (4-TFMA) functionalization enables inert Cu2O cubes to exhibit a good photocatalytic activity. The modified rhombic dodecahedra also showed enhanced photocatalytic activity, but decorated octahedra actually delivered activity suppression. Scavenging experiments reveal that holes are more important than electrons for the photocatalytic activity of the functionalized cubes. Electron paramagnetic resonance (EPR) data agree with the observed photocatalysis results. Density functional theory (DFT) calculations disclose the emergence of one and two 4-TFMA-derived narrow bands within the band gap of the respective {110} and {100} surfaces of Cu2O to promote electron transfer through the molecule to the solution for radical generation, but no such band is present for the functionalized Cu2O {111} surface. Bader charge difference analysis also suggests promotion of charge transfer through 4-TFMA for the {100} and {110} surfaces of Cu2O, but the modification is less helpful over the {111} surface. The modified Cu2O cubes can also improve photocatalyzed arylboronic acid hydroxylation reactions. Conjugated molecular functionalization on semiconductor crystals is a powerful strategy for greatly enhancing electron transfer. © 2024 The Royal Society of Chemistry.

关键词： Photocatalytic activity

来源：评论

学校读者我要写书评

暂无评论

Ronchigram Simulation and Aberration Correction Training using ***

引用

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 1911-1912页

作者： Millsaps, William Sung, Suk Hyun Schnitzer, Noah Kourkoutis, Lena F. Hovden, Robert Engineering Physics Program University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Department of Materials Science and Engineering Cornell University Ithaca NY United States School of Applied and Engineering Physics Cornell University Ithaca NY United States Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca NY United States

来源：评论

学校读者我要写书评

暂无评论

Effect of Surface Roughness on the Magnetism, Nano-indentation, Surface Energy, and Electrical Properties of Co60Fe20Dy20 Films on Si (100) Substrate

引用

Journal of Electronic materials 2024年第4期53卷 1752-1762页

作者： Liu, Wen-Jen Chang, Yung-Huang Chiang, Chia-Chin Chen, Yuan-Tsung Lin, Chih-Chien Chen, Pei-Ling Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung City80778 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

In this study, we focused on depositing a target material, cobalt-iron-dysprosium (Co60Fe20Dy20), onto silicon (Si) (100) substrates with thickness varying from 10 nm to 50 nm through a direct-current (DC) magnetron sputtering technique. The subsequent step involved subjecting the samples to an hour-long annealing process in a vacuum annealing furnace at temperatures of 100°C, 200°C, and 300°C. To assess the elemental composition of the CoFeDy films, energy-dispersive X-ray spectroscopy (EDS) was employed. An observed trend indicated an increase in low-frequency alternating-current magnetic susceptibility (χac) with the increasing thickness. Remarkably, the CoFeDy films exhibited their peak χac following annealing at 300°C, with an optimal resonance frequency of 50 Hz. After annealing at 300°C, the CoFeDy film’s surface energy peaked at 50 nm. The magnetic, electrical, and adhesive properties of the CoFeDy films were notably influenced by surface roughness at different annealing temperatures. Atomic force microscopy (AFM) analysis revealed a gradual reduction in film roughness post-annealing, corresponding to smoother surfaces indicative of a weaker domain wall pinning effect, heightened carrier conductivity, and increased liquid spreading. Collectively, these outcomes contributed to diminished χac, reduced electrical resistance, and enhanced adhesion. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Adhesion

来源：评论

学校读者我要写书评

暂无评论

Topology Effect on Order-Disorder Transition of High-χ Block Copolymers

引用

Macromolecules 2024年第15期57卷 7087-7097页

作者： Chang, Cheng-Yen Manesi, Gkreti-Maria Xie, Jiayu Shi, An-Chang Shastry, Thanmayee Avgeropoulos, Apostolos Ho, Rong-Ming Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan Department of Materials Science Engineering University of Ioannina University Campus Ioannina45110 Greece Department of Physics and Astronomy McMaster University HamiltonONL8S 4M1 Canada

This work aims to systematically examine the topology effect on the self-assembly of block copolymers. Compositionally, symmetric polystyrene-block-polydimethylsiloxane block copolymers (BCPs) with different chain topologies (diblock, three-arm star-block, and four-arm star-block) and various molecular weights are synthesized. These purposely designed block copolymers are used as a model system to investigate the topology effect on order-to-disorder transition temperature (TODT) by temperature-resolved small-angle X-ray scattering experiments. An increase of the TODT is observed when the arm number of BCPs with equivalent arm length (i.e., molecular weight) is increased from one to four. Based on the random-phase approximation (RPA), Flory-Huggins interaction parameter (χ) is determined from the regression of the measured TODT. The observation by differential scanning calorimetry also demonstrates the shifting of the endothermic peak from the order-to-disorder transition of star-blocks to the higher temperature region, consistent with the scattering experiments and the RPA prediction. © 2024 The Authors. Published by American Chemical Society.

关键词： Block copolymers

来源：评论

学校读者我要写书评

暂无评论

Experimental and theoretical studies on two-dimensional vanadium carbide hybrid nanomaterials derived from V_(4)AlC_(3) as excellent catalyst for MgH_(2)

引用

Journal of Magnesium and Alloys 2023年第10期11卷 3790-3799页

作者： Zhiqiang Lan Huiren Liang Xiaobin Wen Jiayang Hu Hua Ning Liang Zeng Haizhen Liu Jun Tan Jürgen Eckert Jin Guo Guangxi Novel Battery Materials Research Center of Engineering Technology Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related TechnologySchool of Physical Science and TechnologyGuangxi UniversityNanning 530004PR China College of mathematics and Physics Guangxi Minzu UniversityNanning 530006PR China College of Materials Science and Engineering Chongqing UniversityChongqing 400044PR China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Department Materials Physics Montanuniversität LeobenJahnstraße 12Leoben A-8700Austria National University of Science and Technology«MISiS» LeninskyProsp.4Moscow 119049Russia

Hydrogen is considered one of the most ideal future energy *** safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen *** the current investigation,two-dimensional vanadium carbide(VC) was prepared by an etching method using V_(4)AlC_(3) as a precursor and then employed to enhance the hydrogen storage properties of MgH_(2).The studied results indicate that VC-doped MgH_(2) can absorb hydrogen at room temperature and release hydrogen at 170℃. Moreover,it absorbs 5.0 wt.%of H_(2) within 9.8 min at 100℃ and desorbs 5.0 wt.% of H_(2) within 3.2 min at 300℃.The dehydrogenation apparent activation energy of VC-doped MgH_(2) is 89.3 ± 2.8 kJ/mol,which is far lower than that of additive-free MgH_(2)(138.5 ± 2.4 kJ/mol),***-initio simulations showed that VC can stretch Mg-H bonds and make the Mg-H bonds easier to break,which is responsible for the decrease of dehydrogenation temperature and conducive to accelerating the diffusion rate of hydrogen atoms,thus,the hydrogen storage properties of MgH_(2) are remarkable improved through addition of VC.

关键词： MgH_2 Two-dimensional Hydrogen storage material Density functional theory

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：