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Magnetic Nanodevices and Spin-Transport Properties of a Two-Dimensional CrSCl Monolayer

Physical Review Applied 2023年第5期19卷 054013-054013页

作者： Juncai Chen Yongliang Guo Chunlan Ma Shijing Gong Chuanxi Zhao Tianxing Wang Xiao Dong Zhaoyong Jiao Shuhong Ma Guoliang Xu Yipeng An School of Physics Henan Normal University Xinxiang 453007 China School of Science Henan Institute of Technology Xinxiang 453003 China School of Physics and Technology Suzhou University of Science and Technology Suzhou 215009 China Department of Physics East China Normal University Shanghai 200062 China Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou 510632 China

The two-dimensional intrinsic ferromagnet CrSCl monolayer has considerable potential for application in the development of spintronic devices because of properties such as robust ferromagnetic ordering, large spin polarization, high Curie temperature, and high carrier mobilities. Here, we investigate the electromagnetic properties of the CrSCl monolayer and the spin-transport properties of some conceptual magnetic devices we construct, such as p-n-junction diodes, field-effect transistors, and phototransistors, by means of first-principles calculations. The results indicate that the p-n-junction diodes of the CrSCl monolayer exhibit full spin-polarized transport behavior, and both the p-n and p-i-n junctions show excellent spin-filtering behavior. The phototransistor of the CrSCl monolayer exhibits spin-resolved photoresponse characteristics for different wavelengths of light. Furthermore, it possesses the ability to generate a fully spin-up polarized current in the visible range. Our results provide key insights into the fundamental physical properties and the underlying transport and photoresponse mechanisms of the CrSCl monolayer.

关键词： First-principles calculations Spin filtering Spin optoelectronics Spin polarization Transport phenomena Diodes Ferromagnets Monolayer films

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Giant Magnetocaloric Effect Near Room Temperature Using Mn-Rich Ni-Mn-Ga Heusler Alloys

SSRN

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SSRN 2024年

作者： Tiwari, Nishant Mishra, Subhendu Sarkar, Suman Talapatra, Saikat Palit, Mithun Paliwal, Manas Singh, Abhishek K. Tiwary, Chandra Sekhar Department of Metallurgical and Materials Engineering Indian Institute of Technology West Bengal Kharagpur721302 India Materials Research Centre Indian Institute of Science Karnataka Bengaluru560012 India Department of Materials Engineering Indian Institute of Technology Jammu Jammu181221 India School of Physics and Applied Physics Southern Illinois University CarbondaleIL62901 United States Powder Processing Group Defence Metallurgical Research Laboratory Kanchanbagh Hyderabad500058 India

Magnetic refrigeration-based technologies rely on magnetocaloric properties of materials, and are crucial for improving energy efficiency as well as support clean environments. However, materials possessing significant magnetocaloric properties that can be used for room temperature based applications are still lacking. Heusler alloys (such as Ni-Mn-Ga) shows giant magnetocaloric effects, which can be further improved by tuning its composition. Here, we have optimized the ratio of Ni and Ga to achieve unique magnetocaloric properties. The alloy demonstrates a substantial magnetocaloric effect, attributed to its narrow temperature range for both structural and magnetic phase transitions (near room temperature with minimal hysteresis). The structural phase changes are also observed through high-resolution transmission electron microscopy. The optimum entropy changes, calculated from isothermal magnetization curves (4 Tesla magnetic field) are found to be 24.50 J/kg-K which is higher as compared to state-of-art alloys. Experimental demonstration of magnetocaloric effect (refrigeration cycle) is also shown with the help of thermal imaging camera. First principle calculations were also conducted to validate the experimental findings, specifically focusing on the compositional effects on the structural transitions and magnetic properties of the investigated MNG alloys. © 2024, The Authors. All rights reserved.

关键词： Magnetocaloric effects

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Tension-compression asymmetry in superelasticity of SrNi2P2 single crystals and the influence of low temperatures

arXiv

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arXiv 2024年

作者： Xiao, Shuyang Valadkhani, Adrian Rommel, Sarshad Canfield, Paul C. Aindow, Mark Valentí, Roser Lee, Seok-Woo Department of Materials Science and Engineering Institute of Materials Science University of Connecticut 25 King Hill Road Unit 3136 StorrsCT06269-3136 United States Institute of Theoretical Physics Goethe University Frankfurt am Main Frankfurt am MainD-60438 Germany Ames Laboratory Department of Physics and Astronomy Iowa State University AmesIA50011 United States

ThCr2Si2-type intermetallic compounds are known to exhibit superelasticity associated with structural transitions through lattice collapse and expansion. These transitions occur via the formation and breaking of Si-type bonds, respectively, under uniaxial loading along the [0 0 1] direction. Unlike most ThCr2Si2-type intermetallic compounds, which have either an uncollapsed tetragonal structure or a collapsed tetragonal structure, SrNi2P2 possesses a third type of collapsed structured: a one-third orthorhombic structure, for which one expects the occurrence of unique structural transitions and superelastic behavior. In this study, uniaxial compression and tension tests were conducted on micron-sized SrNi2P2 single crystalline columns at room temperature, 200K, and 100K, to investigate the influence of loading direction and temperature on the superelasticity of SrNi2P2. Experimental data and density functional theory calculations revealed the presence of tension-compression asymmetry in the structural transitions and superelasticity, as well as an asymmetry in their temperature dependence, due to the opposite superelastic process associated with compression (forming P-P bonds) and tension (breaking P-P bonds). Additionally, following thermodynamics, the observations suggest that this asymmetric superelasticity could lead to an opposite elastocaloric effect between compression and tension, which could be beneficial potentially in obtaining large temperature changes compared to conventional superelastic solids that show the same elastocaloric effect regardless of loading direction. These results provide an important fundamental insight into the structural transitions, superelasticity processes, and potential elastocaloric effects in SrNi2P2 (Image Presented). © 2024, CC BY.

关键词： Strontium compounds

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Photoluminescence enhancement at the vertical van der Waals semiconductor-metal heterostructures

arXiv

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arXiv 2024年

作者： Shakir, Hafiz Muhammad Suleiman, Abdulsalam Aji Kalkan, Kübra Nur Parsi, Amir Başçı, Uğur Durmuş, Mehmet Atıf Ölçer, Ahmet Osman Korkut, Hilal Sevik, Cem Sarpkaya, İbrahim Kasırga, Talip Serkan Department of Physics Bilkent University Ankara06800 Turkey Bilkent University UNAM Institute of Materials Science and Nanotechnology Ankara06800 Turkey Department of Physics NANOLab Center of Excellence University of Antwerp Groenenborgerlaan 171 AntwerpB-2020 Belgium Department of Mechanical Engineering Faculty of Engineering Eskişehir Technical University Eskişehir26555 Turkey

Excitons in monolayer transition metal dichalcogenides (TMDCs) offer intriguing new possibilities for optoelectronics with no analogues in bulk semiconductors. Yet, intrinsic defects in TMDCs limit the radiative exciton recombination pathways. As a result, the photoluminescence (PL) quantum yield (QY) is limited. Methods like superacid treatment, electrical doping, and plasmonic engineering can inhibit nonradiative decay channels and enhance PL. Here, we show a more straightforward approach that allows PL enhancement. An engineered vertical van der Waals (vdW) metal-monolayer semiconductor junction (MSJ) results in PL enhancement of more than an order of magnitude at technologically relevant excitation powers. Such MSJ can be constructed by vertically stacking metals with suitable work function either above or below a monolayer semiconducting TMDC. Our experiments reveal that the underlying PL enhancement mechanism is to be the suppressed exciton quenching due to the absence of metal-induced gap states and weak Fermi level pinning, thanks to the vdW gapped interface between the metal and the TMDC. Our time-resolved PL measurements further indicate that reduced exciton-exciton annihilation, even at high generation rates, contributes to the observed PL enhancement. The PL intensity is further increased by the proximity of surface plasmons in the metal with the TMDC layer. Our findings shed light on the interaction at vdW metal-semiconductor interfaces and offer a path to improving the optoelectronic performance of semiconducting TMDCs. Copyright © 2024, The Authors. All rights reserved.

关键词： Transition metals

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Integration of Scanning Probe Microscope with High-Performance Computing: fixed-policy and reward-driven workflows implementation

arXiv

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arXiv 2024年

作者： Liu, Yu Pratiush, Utkarsh Bemis, Jason Proksch, Roger Emery, Reece Rack, Philip D. Liu, Yu-Chen Yang, Jan-Chi Udovenko, Stanislav Trolier-McKinstry, Susan Kalinin, Sergei V. Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States Oxford Instruments Asylum Research Santa BarbaraCA93117 United States Physical Sciences Division Pacific Northwest National Laboratory RichlandWA99354 United States Department of Physics National Cheng Kung University Tainan70101 Taiwan Materials Science and Engineering Department Materials Research Institute the Pennsylvania State University University ParkPA16802 United States

The rapid development of computation power and machine learning algorithms has paved the way for automating scientific discovery with a scanning probe microscope (SPM). The key elements towards operationalization of automated SPM are the interface to enable SPM control from Python codes, availability of high computing power, and development of workflows for scientific discovery. Here we build a Python interface library that enables controlling an SPM from either a local computer or a remote high-performance computer (HPC), which satisfies the high computation power need of machine learning algorithms in autonomous workflows. We further introduce a general platform to abstract the operations of SPM in scientific discovery into fixed-policy or reward-driven workflows. Our work provides a full infrastructure to build automated SPM workflows for both routine operations and autonomous scientific discovery with machine learning. © 2024, CC BY-NC-ND.

关键词： High level languages

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Electrical 180o switching of Néel vector in spin-splitting antiferromagnet

arXiv

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arXiv 2024年

作者： Han, Lei Fu, Xizhi Peng, Rui Cheng, Xingkai Dai, Jiankun Liu, Liangyang Li, Yidian Zhang, Yichi Zhu, Wenxuan Bai, Hua Zhou, Yongjian Liang, Shixuan Chen, Chong Wang, Qian Chen, Xianzhe Yang, Luyi Zhang, Yang Song, Cheng Liu, Junwei Pan, Feng School of Materials Science and Engineering Tsinghua University Beijing100084 China Department of Physics The Hong Kong University of Science and Technology 999077 Hong Kong State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China Collaborative Innovation Center of Quantum Matter Beijing100084 China Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Min H. Kao Department of Electrical Engineering and Computer Science University of Tennessee KnoxvilleTN37996 United States

Antiferromagnetic spintronics have attracted wide attention due to its great potential in constructing ultra-dense and ultra-fast antiferromagnetic memory that suits modern high-performance information technology. The electrical 180o switching of Néel vector is a long-term goal for developing electrical-controllable antiferromagnetic memory with opposite Néel vectors as binary "0" and "1". However, the state-of-art antiferromagnetic switching mechanisms have long been limited for 90o or 120o switching of Néel vector, which unavoidably require multiple writing channels that contradicts ultra-dense integration. Here, we propose a deterministic switching mechanism based on spin-orbit torque with asymmetric energy barrier, and experimentally achieve electrical 180o switching of spin-splitting antiferromagnet Mn5Si3. Such a 180o switching is read out by the Néel vector-induced anomalous Hall effect. Based on our writing and readout methods, we fabricate an antiferromagnet device with electrical-controllable high and low resistance states that accomplishes robust write and read cycles. Besides fundamental advance, our work promotes practical spin-splitting antiferromagnetic devices based on spin-splitting antiferromagnet. © 2024, CC BY-NC-SA.

关键词： Vectors

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Positive-tone Tin-oxo Nanoclusters for Extreme UV lithography 42

Positive-tone Tin-oxo Nanoclusters for Extreme UV lithograph...

引用

Advances in Patterning materials and Processes XLII

作者： Kim, Gayoung Ku, Yejin Jeon, Subin Lee, Jin-Kyun Lee, Seohyun Jung, Byung Jun Lee, Sung-Il Ryu, Choonghan Park, Kangho Jung, Yun Lim Jeong, Changyoung Choi, Jin Program in in Environment and Polymer Engineering Inha University Incheon22212 Korea Republic of Program in Semiconductor Convergence Inha University Incheon22212 Korea Republic of Department of Polymer Science and Engineering Inha University Incheon22212 Korea Republic of Department of Materials Science and Engineering University of Seoul Seoul02504 Korea Republic of Samsung Electronics Co. Ltd. Semiconductor R&D Center Suwon18448 Korea Republic of

ISBN: (纸本)9781510686427

In this study, we propose a strategy to achieve positive metal oxide resists (pMORs) based on tin-oxo nanoclusters (TOCs) for extreme ultraviolet (EUV) lithography in high-performance semiconductor integrated circuit manufacturing. TOC possesses Lewis acidic properties and becomes more strongly acidic upon ligand dissociation when exposed to high-energy radiation, such as electron beam (e-beam) and EUV. During the subsequent development process using an aqueous solution of tetramethylammonium hydroxide (TMAH), a Lewis base, the exposed regions undergo Lewis acid-base interactions, leading to increased hydrophilicity. Ultimately, this results in enhanced solubility, enabling the formation of positive-tone patterns. To address the limitations of TOCs, particularly in terms of process margin and chemical stability, we mixed TOCs with small organic molecules containing phenolic hydroxyl groups, which act as Lewis bases. This modification effectively mitigated the shortcomings of TOCs. A TOC formulation containing 10% dendritic polyphenol (DPP) exhibited an improved dissolution contrast while simultaneously enhancing chemical stability. Using this in EUV lithography, we successfully achieved high resolution positive-tone patterns with a line width of 13 nm. © 2025 SPIE.

关键词： Extreme ultraviolet lithography

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Abnormal anti-oxidation behavior of hexagonal boron nitride grown on copper

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Nano Research 2022年第8期15卷 7577-7583页

作者： Li Wang Jiajie Qi Shuai Zhang Mingchao Ding Wei Wei Jinhuan Wang Zhihong Zhang Ruixi Qiao Zhibin Zhang Zehui Li Kehai Liu Ying Fu Hao Hong Can Liu Muhong Wu Wenlong Wang Jun He Yi Cui Qunyang Li Xuedong Bai Kaihui Liu State Key Laboratory for Mesoscopic Physics Frontiers Science Center for Nano-optoelectronicsSchool of PhysicsPeking UniversityBeijing 100871China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Engineering Mechanics State Key Laboratory of TribologyTsinghua UniversityBeijing 100084China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China International Centre for Quantum Materials Collaborative Innovation Centre of Quantum MatterPeking UniversityBeijing 100871China Songshan Lake Materials Laboratory Institute of PhysicsChinese Academy of SciencesDongguan 523808China CAS Center for Excellence in Nanoscience CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

Atomic-layered hexagonal boron nitride(hBN)is expected to be the best two-dimensional(2D)anti-oxidation layer on metals for its incomparable impermeability,insulativity,and stability,as well as the progressive bottom-up growth techniques to ensure fast coating on metal surface in large ***,its real anti-oxidation ability in practice is found to be unsatisfactory and nonuniform,and the main obstacle to achieving ideal anti-oxidation performance lies in unclear anti-oxidation behavior at special interface between 2D hBN and three-dimensional(3D)***,system of monolayer hBN grown on copper(Cu)foils with various lattice orientations was grown to investigate the anti-oxidation behavior of different interlayer *** using structural characterizations together with analysis of topography,we surprisingly found that stronger interlayer coupling led to worse anti-oxidation performance owing to fast diffusion of O2 through higher hBN corrugations generated at the commensurate hBN/Cu(111)*** view of this,we developed the approach of cyclic reannealing that can effectively flatten corrugations and steps,and therefore improve the anti-oxidation performance to a great *** work provides a more indepth understanding of anti-oxidation behavior of 2D materials grown on 3D metals,and a practical method to pave the way for its large-scale applications in future.

关键词： hexagonal boron nitride anti-oxidation of metals nanoscale corrugation cyclic reannealing method

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Ductility Deterioration Induced by L21 Phase in Ferritic Alloy Through Ti Addition

SSRN

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SSRN 2023年

作者： Chen, Xu Peng, Shaowen Liu, Ye Bai, Song Zhang, Lin He, Shuang Gorbatov, Oleg I. Qu, Xuanhui School of Materials Science and Engineering Xiangtan University Xiangtan411105 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China Applied Physics Division of Materials Science Department of Engineering Sciences and Mathematics Luleå University of Technology Luleå97187 Sweden

Ductility deterioration induced by L21-Ni2AlTi precipitate in the aged ferritic alloys was examined systematically by using a combination of scanning transmission electron microscope (STEM), mechanical tests and first-principles thermodynamic calculations. The experimental studies revealed that the strength and hardness of the aged Fe-10Cr-5Ni-1Al-1Ti ferritic alloy containing B2-NiAl and L21-Ni2AlTi precipitates were higher than that of the aged Fe-10Cr-5Ni-1Al ferritic alloy containing NiAl precipitate, whereas the elongation-to-failure decreased dramatically from 9.3% to 0.3% indicating the obvious ductility deterioration due to the formation of L21-Ni2AlTi precipitates, which was also confirmed by the observation that transition of fracture mode from dimpled failure to cleavage failure. The first-principles calculations focused on the precipitate/matrix interface were carried out to provide a theoretical analysis for the ductile-brittle transition by means of empirical Pugh ratio G/B and cleavage energy. The increased G/B ratio of L21-Ni2AlTi/BCC-Fe interface was closely related to the ductility deterioration, furthermore, the cleavage energy results also indicated an intrinsic brittleness of the L21-Ni2AlTi phase and the L21-Ni2AlTi/BCC-Fe interface. Our analyses revealed that the intrinsic brittleness of L21-Ni2AlTi phase and L21-Ni2AlTi/BCC-Fe interface plays a vital role in determining the deformation behavior of the aged Fe-10Cr-5Ni-1Al-1Ti alloy. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

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Amorphous-to-nanocrystalline transition in silicon thin films by hydrogen diluted silane using PE-CVD method

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Recent Innovations in Chemical engineering 2021年第1期14卷 58-70页

作者： Jadhavar, Ashok Doiphode, Vidya Bhorde, Ajinkya Hase, Yogesh Shinde, Pratibha Punde, Ashvini Vairale, Priti Nair, Shruthi Pandharkar, Subhash Waghmare, Ashish Patil, Nilesh Patil, Dinkar Prasad, Mohit Jadkar, Sandesh School of Energy Studies Savitribai Phule Pune University Pune411 007 India Department of Metallurgical Engineering and Materials Science IIT Powai Mumbai400 076 India Department of Physics Savitribai Phule Pune University Pune411 007 India

Objective: Herein, we report the effect of variation of hydrogen flow rate on the properties of Si:H films synthesized using PE-CVD method. Raman spectroscopy analysis show an increase in crystalline volume fraction and crystallite size implying that hydrogen flow in PE-CVD promotes the growth of crystallinity in nc-Si:H films with an expense of a reduction in deposition rate. Methods: FTIR spectroscopy analysis indicates that hydrogen content in the film increases with an increase in hydrogen flow rate and hydrogen is predominantly incorporated in Si-H2 and (Si-H2)n bonding configuration. The optical band gap determined using E04 method and Tauc method (ETauc) show an increasing trend with an increase in hydrogen flow rate and E04 is found higher than ETauc over the entire range of hydrogen flow rate studied. Results and Conclusion: We found that the defect density and Urbach energy increases with an increase in hydrogen flow rate. Photosensitivity (σPhoto /σDark) decreases from ~103 to ~1 when hydrogen flow rate is increased from 30 sccm to 100 sccm and can be attributed to amorphous-to-nanocrystallization transition in Si:H films. The results obtained from the present study demonstrated that hydrogen flow rate is an important deposition parameter in PECVD to synthesize nc-Si:H films. © 2021 Bentham science Publishers.

关键词： Nanocrystals

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