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Electronic structures of NANOMET-based nanocrystalline soft magnetic Alloys: Magnetic properties

Physica B: Condensed Matter 2025年 714卷

作者： Jihye Park Minyeong Choi Hyunkyung Lee Haein Choi-Yim Yang-Ki Hong Seong-Gon Kim C. Heath Turner Department of Applied Physics Sookmyung Women's University Seoul 04310 South Korea Hyundai Motor Company 150 HyundaiYeonguso-ro Namyang-eup Hwaseong-si Gyeonggi-do 18280 South Korea Department of Electrical and Computer Engineering and Materials Science Ph.D. Program The University of Alabama Tuscaloosa AL 35487 USA Department of Physics and Astronomy Mississippi State University Mississippi State MS 39762 USA Department of Chemical and Biological Engineering The University of Alabama Tuscaloosa AL 35487 USA

We developed new nanocrystalline Fe-Co-B-P-Cu soft magnetic alloys and studied their magnetic properties by calculating electronic structures using first-principles calculations based on density functional theory within the local spin density approximation and the Brillouin function. The supercell Fe-B-P-Cu was equilibrated at 3000 K for 12 ps using ab initio molecular dynamics (AIMD). Consequently, Fe, B, P, and Cu atoms are distributed randomly in an amorphous matrix formed by cooling it to 0 K. The ferromagnetic bcc α -(Fe 50 Co 50 ) crystallites were formed in the amorphous matrix by annealing the mixture at 300 K and cooling to 0 K. This resulted in the formation of nanocrystalline (Fe, Co)-B-P-Cu soft magnetic alloys. The ferromagnetic bcc α -Fe(Co) crystallites, embedded in an amorphous matrix, were confirmed experimentally for the first time. The experiment involved quickly cooling and heating a melted mixture of Fe, Co, B, Fe 3 P, and Cu to create both amorphous ribbons and crystallites. The Fe-Co-B-P-Cu alloy designed for the experiment has a saturation magnetization ( μ 0 M S ) of over 1.9 T (T) at 0 K and ranging from 1.87 to 1.92 T at 300 K. The magnetocrystalline anisotropy constant (K) decreased significantly to 142 J/m 3 from 5.2 × 104 J/m 3 with an increase in the number of embedded crystallites from one to five, indicating that the alloy became magnetically soft. At 300 K, the experimental μ 0 M S ranged from 1.79 to 1.89 T. Additionally, as the concentration of Co increased, the Curie temperature (T C ) also increased and reached about 800 °C at 3.5 at.%. The study revealed that the average grain size of the synthesized Fe-Co-B-P-Cu alloys was 29 nm. The experimental μ 0 M S was slightly lower than the calculated value for all designed Fe-Co-B-P-Cu alloys, indicating that the recrystallization process was not entirely controlled. The experimental results confirmed that the designed alloy system has achieved the target saturation magnetization of o

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Inverse-designed silicon photonic circuit for nonreciprocal transmission

Inverse-designed silicon photonic circuit for nonreciprocal ...

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Frontiers in Optics, FIO 2019 - Part of Frontiers in Optics + Laser science APS/DLS

作者： Yang, Ki Youl Skarda, Jinhie Cotrufo, Michele Ahn, Geun Ho Alù, Andrea Vučković, Jelena E. L. Ginzton Laboratory Stanford University StanfordCA94305 United States Department of Electrical and Computer Engineering University of Texas at Austin AustinTX78712 United States Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York New YorkNY10016 United States Department of Electrical Engineering City University of New York New YorkNY10031 United States

Broadband nonreciprocal transmission is demonstrated in an inverse-designed silicon photonic circuit. Cascaded nonlinear resonators break the single-resonator fundamental bound on forward transmission at wide nonrecip... 详细信息

ISBN: (纸本)9781943580675

关键词： Silicon photonics

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Ultra-Efficient Resistance Switching between Charge Ordered Phases in 1T-TaS2 with a Single Picosecond electrical Pulse

arXiv

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arXiv 2022年

作者： Venturini, Rok Mraz, Anže Vaskivskyi, Igor Vaskivskyi, Yevhenii Svetin, Damjan Mertelj, Tomaž Pavlovič, Leon Cheng, Jing Chen, Genyu Amarasinghe, Priyanthi Qadri, Syed B. Trivedi, Sudhir B. Sobolewski, Roman Mihailovic, Dragan Jožef Stefan Institute Jamova 39 LjubljanaSI-1000 Slovenia Faculty of Mathematics and Physics University of Ljubljana Jadranska 19 LjubljanaSI-1000 Slovenia Faculty for Electrical Engineering University of Ljubljana Tržaška 25 LjubljanaSI-1000 Slovenia CENN Nanocenter Jamova 39 LjubljanaSI-1000 Slovenia ELEP Electronics LjubljanaSI-1000 Slovenia Materials Science Program Laboratory for Laser Energetics University of Rochester New York14627 United States Brimrose Technology Corporation SparksMD21152 United States U.S. Naval Research Laboratory WashingtonDC United States Department of Electrical and Computer Engineering Department of Physics and Astronomy University of Rochester New York14627 United States

Progress in high-performance computing demands significant advances in memory technology. Among novel memory technologies that promise efficient device operation on a sub-ns timescale, resistance switching between charge ordered phases of 1T-TaS2 has shown to be potentially useful for development of high-speed, energy efficient non-volatile memory devices. Measurement of the electrical operation of such devices in the picosecond regime is technically challenging and hitherto still largely unexplored. Here we use an optoelectronic "laboratory-on-a-chip" experiment for measurements of ultrafast memory switching, enabling accurate measurement of electrical switching parameters with 100 fs temporal resolution. Photoexcitation and electro-optic sampling on a (Cd,Mn)Te substrate are used to generate and, subsequently, measure electrical pulse propagation, with intra-band excitation and sub-gap probing, respectively. We demonstrate high contrast non-volatile resistance switching from high to low resistance states of a 1T-TaS2 device using single sub-2ps electrical pulses. Using detailed modeling we find that the switching energy density per unit area is exceptionally small, EA = 9.4 fJ/µm2. The speed and energy efficiency of an electronic "write" process, place the 1T-TaS2 devices into a category of their own among new generation non-volatile memory devices. Copyright © 2022, The Authors. All rights reserved.

关键词： Switching

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Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet

arXiv

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arXiv 2023年

作者： Wu, Han Zhu, Jian-Xin Chen, Lebing Butcher, Matthew W. Yue, Ziqin Yuan, Dongsheng He, Yu Oh, Ji Seop Huang, Jianwei Wu, Shan Gong, Cheng Guo, Yucheng Mo, Sung-Kwan Denlinger, Jonathan D. Lu, Donghui Hashimoto, Makoto Stone, Matthew B. Kolesnikov, Alexander I. Chi, Songxue Kono, Junichiro Nevidomskyy, Andriy H. Birgeneau, Robert J. Dai, Pengcheng Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Department of Physics University of California at Berkeley BerkeleyCA94720 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States 1-1 Namiki Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Yale University New HavenCT06511 United States Department of Electrical and Computer Engineering Quantum Technology Center University of Maryland College ParkMD20742 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States Department of Materials Science and Engineering University of California Berkeley United States

The two-dimensional (2D) material Cr2Ge2Te6 is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets. © 2023, CC BY.

关键词： Electronic structure

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Publisher Correction: Reduced recombination via tunable surface fields in perovskite thin films

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Nature Energy 2024年 762页

作者： Dane W. deQuilettes Roberto Brenes Madeleine Laitz Benjia Dak Dou Vladimir Bulović Jason J. Yoo Moungi G. Bawendi Seong Sik Shin Felix Utama Kosasih Caterina Ducati Daniel J. Graham Kevin Ho Yangwei Shi Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Chemistry Massachusetts Institute of Technology Cambridge MA USA Division of Advanced Materials Korea Research Institute of Chemical Technology Daejeon Republic of Korea Department of Nano Engineering and Department of Nano Science and Technology SKKU Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University Suwon Republic of Korea SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University Suwon Republic of Korea Department of Materials Science and Metallurgy University of Cambridge Cambridge UK Department of Bioengineering University of Washington Seattle WA USA Department of Chemistry University of Washington Seattle WA USA Molecular Engineering and Sciences Institute University of Washington Seattle WA USA

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Efficient Focusing with Large Numerical Aperture Using a Hybrid Metalens

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Physical Review Applied 2020年第4期13卷 044016-044016页

作者： Ming Kang Younes Ra'di Diego Farfan Andrea Alù Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 USA Photonics Initiative Advanced Science Research Center City University of New York New York 10031 USA Physics Program Graduate Center City University of New York New York 10016 USA Department of Electrical Engineering City College of The City University of New York New York 10031 USA

Focusing light using electrically thin layers is of paramount importance in several applications, from integrated optics to microwave engineering and sensing. Recently, gradient metasurfaces, which are electrically thin arrays of densely located polarizable particles, have been employed to perform different wave-front transformations, including focusing. In comparison to a bulk lens, these designs provide ultrathin geometries, but they suffer from fundamental limitations on their overall efficiency and achievable numerical aperture. Metagratings offer a solution for efficient beam steering at large angles, but it is challenging to utilize them in the small-angle limit. Here, we introduce a hybrid metalens design, which provides dramatic enhancement in lensing performance compared with that of state-of-the-art metasurfaces, combining metagratings and conventional gradient approaches. Our experimental prototype enables microwave focusing with large efficiency (η=0.479) and near-unity numerical aperture (NA=0.98), yielding a sharp focal point at the diffraction limit in the far field (FWHM=0.332λ). We propose a hybrid metalens design with exceptional performance in terms of efficiency and numerical aperture, opening up opportunities for high-throughput optical lithography, high-density data recording, focal plane arrays, radar, and communication systems.

关键词： Classical optics Integrated optics Metamaterials Optical & microwave phenomena Devices Surfaces

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Coherent growth and characterization of van der Waals 1T−VSe2 layers on GaAs(111)B using molecular beam epitaxy

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Physical Review Materials 2020年第8期4卷 084002-084002页

作者： Tiancong Zhu Dante J. O’Hara Brenton A. Noesges Menglin Zhu Jacob J. Repicky Mark R. Brenner Leonard J. Brillson Jinwoo Hwang Jay A. Gupta Roland K. Kawakami Department of Physics The Ohio State University Columbus Ohio 43210 USA Program in Materials Science and Engineering University of California Riverside California 92521 USA Materials Science Division Lawrence Livermore National Laboratory Livermore California 94550 USA Department of Materials Science and Engineering The Ohio State University Columbus Ohio 43210 USA Department of Electrical and Computer Engineering The Ohio State University Columbus Ohio 43210 USA Semiconductor and Epitaxy Analysis Laboratory The Ohio State University Columbus Ohio 43210 USA

We report epitaxial growth of vanadium diselenide (VSe2) thin films in the octahedrally coordinated (1T) structure on GaAs(111)B substrates by molecular beam epitaxy. Film thickness from a single monolayer (ML) up to 30 ML is demonstrated. Structural and chemical studies using x-ray diffraction, transmission electron microscopy, scanning tunneling microscopy, and x-ray photoelectron spectroscopy indicate high-quality thin films. Further studies show that monolayer VSe2 films on GaAs are not air stable and are susceptible to oxidation within a matter of hours, which indicates that a protective capping layer should be employed for device applications. This work demonstrates that VSe2, a candidate van der Waals material for possible spintronic and electronic applications, can be integrated with III-V semiconductors via epitaxial growth for two- and three-dimensional hybrid devices.

关键词： Chemical bonding Growth Ferromagnets III-V semiconductors Transition metal dichalcogenides Molecular beam epitaxy Reflection high-energy electron diffraction

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Plasmonic bacteria on a nanoporous mirror via hydrodynamic trapping for rapid identification of waterborne pathogens

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Light(science & Applications) 2018年第1期7卷 359-367页

作者： Keumrai Whang Jong-Hwan Lee Yonghee Shin Wooju Lee Young Wan Kim Dongchoul Kim Luke P.Lee Taewook Kang Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Korea Berkeley Sensor and Actuator Center Departments of BioengineeringElectrical Engineering and Computer ScienceBiophysics Graduate ProgramUniversity of CaliforniaBerkeleyBerkeleyCA 94720USA Department of Mechanical Engineering Sogang UniversitySeoul 04107Korea

A rapid,precise method for identifying waterborne pathogens is critically needed for effective disinfection and better ***,conventional methods,such as culture-based counting,generally suffer from slow detection times and low ***,we developed a rapid detection method for tracing waterborne pathogens by an innovative optofluidic platform,a plasmonic bacteria on a nanoporous mirror,that allows effective hydrodynamic cell trapping,enrichment of pathogens,and optical signal *** designed and simulated the integrated optofluidic platform to maximize the enrichment of the bacteria and to align bacteria on the nanopores and plasmonic mirror via hydrodynamic cell *** nanoparticles are self-assembled to form antenna arrays on the surface of bacteria,such as Escherichia coli and Pseudomonas aeruginosa,by replacing citrate with hydroxylamine hydrochloride in order to amplify the signal of the plasmonic optical *** to the synergistic contributions of focused light via the nanopore geometry,self-assembled nanoplasmonic optical antennas on the surface of bacteria,and plasmonic mirror,we obtain a sensitivity of detecting *** as low as 102 cells/ml via surface-enhanced Raman *** believe that our label-free strategy via an integrated optofluidic platform will pave the way for the rapid,precise identification of various pathogens.

关键词： mirror trapping precise

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Overcoming the surface paradox: Buried perovskite quantum dots in wide-bandgap perovskite thin films

arXiv

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arXiv 2025年

作者： Zhang, Hao Pasha, Altaf Metcalf, Isaac Zhou, Jianlin Staunstrup, Mathias Zhu, Yunxuan Liao, Shusen Ssennyimba, Ken Chen, Jia-Shiang Reddy, Surya Prakash Thébaud, Simon Hou, Jin Shuai, Xinting Mandani, Faiz Sidhik, Siraj Jones, Matthew R. Ma, Xuedan Balakrishna, R. Geetha Susarla, Sandhya Ginger, David S. Katan, Claudine Kanatzidis, Mercouri G. Bawendi, Moungi G. Natelson, Douglas Tamarat, Philippe Lounis, Brahim Even, Jacky Mohite, Aditya D. Department of Chemical and Biomolecular Engineering Rice University HoustonTX77005 United States Applied Physics Program Smalley‐Curl Institute Rice University HoustonTX77005 United States Centre for Nano and Material Sciences Jain University Jain Global Campus Kanakapura Karnataka Bangalore562112 India Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States Université de Bordeaux LP2N Talence France Institut d’Optique CNRS LP2N Talence France Department of Physics and Astronomy Rice University HoustonTX77005 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60439 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85281 United States UMR 6082 CNRS INSA de Rennes Rennes35708 France Department of Chemistry Rice University HoustonTX77005 United States Department of Chemistry University of Washington Box 351700 SeattleWA98195-1700 United States UMR 6226 Rennes35000 France Department of Chemistry Northwestern University EvanstonIL United States Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue CambridgeMA02139 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States

Colloidal perovskite quantum dots (PQDs) are an exciting platform for on-demand quantum, and classical optoelectronic and photonic devices. However, their potential success is limited by the extreme sensitivity and low stability arising from their weak intrinsic lattice bond energy and complex surface chemistry. Here we report a novel platform of buried perovskite quantum dots (b-PQDs) in a three-dimensional perovskite thin-film, fabricated using one-step, flash annealing, which overcomes surface related instabilities in colloidal perovskite dots. The b-PQDs demonstrate ultrabright and stable single-dot emission, with resolution-limited linewidths below 130 μeV, photon-antibunching (g2(0)=0.1), no blinking, suppressed spectral diffusion, and high photon count rates of 104/s, consistent with unity quantum yield. The ultrasharp linewidth resolves exciton fine-structures (dark and triplet excitons) and their dynamics under a magnetic field. Additionally, b-PQDs can be electrically driven to emit single photons with 1 meV linewidth and photon-antibunching (g2(0)=0.4). These results pave the way for on-chip, low-cost single-photon sources for next generation quantum optical communication and sensing. © 2025, CC BY.

关键词： Photons

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Wind energy electret-based electrostatic harvester 21

Wind energy electret-based electrostatic harvester

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21st European Conference on Power Electronics and Applications, EPE 2019 ECCE Europe

作者： Coronado, Daniel Augusto Castellanos Romano, Emanuele Dallago, Enrico Juan de Castellanos University Foundation School of Engineering and Basic Sciences Research Group in Science Innovation and Technology Electronic Engineering Program Tunja Colombia University of Pavia Power Electronics Laboratory Department of Electrical Computer and Biomedical Engineering Pavia Italy

ISBN: (纸本)9789075815313

In this paper an electret-based electrostatic induction wind harvester is presented. The induction electrostatic field is produced with an electret. It is described how the electret and the harvester prototype have been obtained. A complete electrical characterization of the harvester and experimental results are then reported. © 2019 EPE Association.

关键词： Wind power

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