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International Conference on Perspective Technologies and Methods in MEMS Design (MEMSTECH)

作者： Nitin Vijay Satpute Prakash Dhoka Swapnil Arawade Siddharth Jabade Marek Iwaniec Ramesh Narina Nikhil Mohan Shinde Department of Mechanical engineering Vishwakarma University Pune India Engineer Research and Development Industrial Metal Powder Pvt. Ltd Pune India Department of Mechanical engineering Faculty of science and technology Vishwakarma University Pune India Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland

ISBN: (纸本)9798350396812

Miniaturized inductive sensors have measurement range of few millimeters and are used for accuracy within few micrometers. It is very crucial to maintain the accuracy of these sensors by magnetic shielding since their accuracy is influenced by presence of external magnetic field. In this paper study of magnetic shielding of a MEMS minimalized Linear Variable Differential Transformer (LVDT) has been presented, where pure iron has been used as the shieling material. The finite element analysis has been performed to investigate influence of external magnetic field of a permanent magnet on output voltage of the sensor. It has been demonstrated that incorporation of 300 $\mu$m thick pure iron shield spaced at distance of 5.0 mm from the sensor, ensures significant attenuation of error introduced due to presence of external magnetic field near the sensor.

关键词： Micromechanical devices Coils Magnetic sensors Simulation Transformers Iron Permanent magnets

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Magnetic Shielding of Linear Variable Differential Transformer with Pure Iron Foils

Magnetic Shielding of Linear Variable Differential Transform...

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International Conference on Perspective Technologies and Methods in MEMS Design (MEMSTECH)

作者： Nitin Vijay Satpute Swapnil Arawade Ramesh Narina Siddharth Jabade Marek Iwaniec Nikhil Mohan Shinde Department of Mechanical engineering Vishwakarma University Pune India Engineer Research and Development Industrial Metal Powder Pvt. Ltd Pune India Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland Department of Mechanical engineering Faculty of science and technology Vishwakarma University Pune India

ISBN: (纸本)9798350396812

Accuracy of Linear Variable Differential Transformer (LVDT) is influenced due to presence of an external magnetic field. In this paper an experimental study is presented which uses a pure iron foil for magnetic shielding of the sensor. The pure iron used in the present study is manufactured with a novel method of electrodeposition, cold rolling and intermediate annealing in a controlled environment. The magnetic properties of the pure iron manufactured with the new method are characterized by Vibrating Sample Magnetometer (VSM) to determine initial magnetization and hysteresis curve. The pure iron material exhibits properties, which make it a suitable candidate material for magnetic shielding. Further, the pure iron foils are used for electromagnetic shielding of LVDT to ensure that incorporation of the shielding ensures reduction in the sensor error from 7.7% to 2.3% and minimizes the effect of an external magnetic field on the sensor performance.

关键词： Magnetic flux Magnetic field measurement Voltage measurement Magnetometers Magnetic noise Magnetic hysteresis Iron

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Kepler problem and chiral effective dynamics

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Physical Review E 2022年第6期106卷 064207-064207页

作者： Katarzyna Bolonek-Lasoń Joanna Gonera Piotr Kosiński Department of Statistical Methods Faculty of Economics and Sociology University of Lodz 41/43 Rewolucji 1905 Street 90-214 Lodz Poland Department of Computer Science Faculty of Physics and Applied Informatics University of Lodz 149/153 Pomorska Street 90-236 Lodz Poland

It is shown that by an appropriate canonical transformation, Kepler dynamics can be put in the form which allows one to exhibit the structure of the symmetry transformations related to the superintegrability. They appear to fit nicely into a general scheme of nonlinear realizations. In new coordinates, the Kepler dynamics results from dimensional reduction of that describing low-energy mesons with spontaneously broken chiral symmetry.

关键词： Mathematical physics

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Neutron Filter using Periodic Multilayers of Ferromagnetic and Paramagnetic Layers

Research Square

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Research Square 2023年

作者： Zaky, Zaky A. Al-Dossari, M. Zhaketov, V.D. Hendy, Ahmed S. Aly, Arafa H. TH-PPM Group Physics Department Faculty of Science Beni-Suef University 62521 Egypt Cairo Egypt Department of Physics Faculty of Science King Khalid University Abha62529 Saudi Arabia Frank Laboratory of Neutron Physics Joint Institute for Nuclear Research Dubna141980 Russia Moscow Institute of Physics and Technology Russia Department of Computational Mathematics and Computer Science Institute of Natural Sciences and Mathematics Ural Federal University 19 Mira St. Yekaterinburg620002 Russia

Binary and ternary multilayers comprising paramagnetic and ferromagnetic materials filter out a specific neutron wavelength from the reflected broad spectrum. The effect of the grazing angle, the magnetization of the ferromagnetic layers and the scattering length density of the ferromagnetic layers for both structures are studied. The best performance of the proposed filter, such as the broadest neutron bandgap of 0.46 Å and the smallest bandwidth of the transmitted beam of 0.0016 Å, was achieved using the binary structure at magnetization of 40 kOe. These findings hold potential in the nuclear fields, including neutron waveguides and filters. © 2023, CC BY.

关键词： Multilayers

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Impact of hydrostatic pressure, nonstoichiometry, and doping on trimeron lattice excitations in magnetite during axis switching

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Physical Review B 2023年第24期108卷 245148-245148页

作者： T. Kołodziej J. Piętosa R. Puźniak A. Wiśniewski G. Król Z. Kąkol I. Biało Z. Tarnawski M. Ślęzak K. Podgórska J. Niewolski M. A. Gala A. Kozłowski J. M. Honig W. Tabiś AGH University of Krakow Faculty of Physics and Applied Computer Science Aleja Mickiewicza 30 30-059 Kraków Poland SOLARIS National Synchrotron Radiation Centre Czerwone Maki 98 30-392 Kraków Poland Institute of Physics Polish Academy of Sciences Aleja Lotników 32/46 02-668 Warszawa Poland AGH University of Krakow IT Solutions Centre Aleja Mickiewicza 30 30-059 Kraków Poland Physik-Institut Universität Zürich Winterthurerstrasse 190 CH-8057 Zurich Switzerland Institute of Solid State Physics TU Wien 1040 Vienna Austria Department of Chemistry Purdue University West Lafayette IN 47906 Indiana USA

Trimeron lattice excitations in single crystalline magnetite, in the form of c axis switching (i.e., the reorganization of the lattice caused by an external magnetic field) at temperatures below the Verwey temperature TV are observed by magnetization experiments. These excitations exhibit strong sensitivity to doping (with Zn, Al, and Ti), nonstoichiometry, and hydrostatic pressure (p<1.2GPa). The considered indicators of the axis switching (AS) are the switching field Bsw, the energy density needed to switch the axis Esw, and the activation energy U. Our results show that hydrostatic pressure p weakens the low-T magnetite structure (decreases TV) and has roughly similar effects on AS in Zn-doped Fe3O4 and, to a much lesser extent, in stoichiometric magnetite. We have, however, found that while doping/nonstoichiometry also lowers TV, making it more prone to temperature chaos, it drastically increases the switching field, and activation and switching energies, suggesting that the trimeron order, subject to change while AS occurs, is more robust. Consequently, we conclude that the manipulation of trimerons in the process of axis switching and the mechanisms leading to the Verwey transition are distinct phenomena.

关键词： Magnetism Pressure effects Quasiparticles & collective excitations Spin reorientation transition

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Two-Dimensional Phase-Fluctuating Superconductivity in Bulk-Crystalline NdO0.5F0.5BiS2

arXiv

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arXiv 2024年

作者： Chen, C.S. Küspert, J. Bialo, I. Mueller, J. Chen, K.W. Zou, M.Y. Mazzone, D.G. Bucher, D. Tanaka, K. Ivashko, O. Zimmermann, M.V. Wang, Qisi Shu, Lei Chang, J. State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Physik-Institut Universität Zürich Winterthurerstrasse 190 ZürichCH-8057 Switzerland AGH University of Krakow Faculty of Physics and Applied Computer Science Krakow30-059 Poland Laboratory for Neutron Scattering and Imaging Paul Scherrer Institut Villigen PSICH-5232 Switzerland Department of Physics and Engineering Physics University of Saskatchewan 116 Science Place SaskatoonSKS7N 5E2 Canada Deutsches Elektronen-Synchrotron DESY Notkestraße 85 Hamburg22607 Germany Department of Physics The Chinese University of Hong Kong Shatin Hong Kong

We present a combined growth and transport study of superconducting single-crystalline NdO0.5F0.5BiS2. Evidence of two-dimensional superconductivity with significant phase fluctuations of preformed Cooper pairs preceding the superconducting transition is reported. This result is based on three key observations. (1) The resistive superconducting transition temperature Tc (defined by resistivity ρ → 0) increases with increasing disorder. (2) As T → Tc, the conductivity diverges significantly faster than what is expected from Gaussian fluctuations in two and three dimensions. (3) Non-Ohmic resistance behavior is observed in the superconducting state. Altogether, our observations are consistent with a temperature regime of phase-fluctuating superconductivity. The crystal structure with magnetic ordering tendencies in the NdO0.5F0.5 layers and (super)conductivity in the BiS2 layers is likely responsible for the two-dimensional phase fluctuations. As such, NdO0.5F0.5BiS2 falls into the class of unconventional "laminar" bulk superconductors that include cuprate materials and 4Hb-TaS2 Copyright © 2024, The Authors. All rights reserved.

关键词： Bismuth compounds

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Granular gases under resetting

arXiv

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arXiv 2024年

作者： Bodrova, Anna S. Chechkin, Aleksei V. Dubey, Awadhesh Kumar Moscow Institute of Electronics and Mathematics HSE University Moscow123458 Russia Institute of Physics and Astronomy University of Potsdam Potsdam14476 Germany Faculty of Pure and Applied Mathematics Wroclaw University of Science and Technology Wyspianskiego 27 Wroclaw50-370 Poland Max Planck Institute of Microstructure Physics Weinberg 2 Halle06120 Germany Department of Pure and Applied Physics Guru Ghasidas Vishwavidyalaya Koni Chhattisgarh Bilaspur495009 India

We investigate the granular temperatures in force-free granular gases under exponential resetting. When a resetting event occurs, the granular temperature attains its initial value, whereas it decreases because of the inelastic collisions between the resetting events. We develop a theory and perform computer simulations for granular gas cooling in the presence of Poissonian resetting events. We also investigate the probability density function to quantify the distribution of granular temperatures. Our theory may help us to understand the behavior of nonperiodically driven granular systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Probability density function

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Probabilistic High Dynamic Range Preprocessing for Ptychography

Probabilistic High Dynamic Range Preprocessing for Ptychogra...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Kodgirwar, Shantanu Loetgering, Lars Liu, Chang Licht, Leona Joseph, Aleena Penagos, Daniel Santiago Eschen, Wilhelm Rothhardt, Jan Habeck, Michael Faculty of Medicine Friedrich Schiller University Jena Jena07743 Germany Carl Zeiss AG Carl-Zeiss-Promenade 10 Jena07745 Germany Institute of Applied Physics Friedrich Schiller University Jena Albert-Einstein-Strasse 6 Jena07745 Germany Helmholtz-Institute Jena Froebelstieg 3 Jena07743 Germany Fraunhofer IOF Albert-Einstein-Strasse 7 Jena07745 Germany Faculty of Mathematics and Computer Science Friedrich Schiller University Jena Ernst-Abbe-Platz 2 Jena07743 Germany Max Plank Institute for Multidisciplinary Sciences Am Fassberg 11 Goettingen37077 Germany

ISBN: (纸本)9781957171395

Fusing acquisitions by varying exposures, from under to overexposed, yields a high dynamic range image. To enhance resolution, this is often used as a preprocessing step in ptychography. Our proposed probabilistic approach models overexposure while taking into account readout noise, resulting in improved inverse modeling. © Optica Publishing Group 2024, © 2024 The Author(s)

关键词： Inverse problems

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Evolution of Surface Properties of Titanium Oxide Thin Films

SSRN

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SSRN 2022年

作者： Placheta, Katarzyna Kot, Anna Banas-Gac, Joanna Zając, Marcin Sikora, Marcin Radecka, Marta Zakrzewska, Katarzyna Faculty of Materials Science and Ceramics AGH University of Science and Technology Al. A. Mickiewicza 30 Kraków30-059 Poland Faculty of Computer Science Electronics and Telecommunications AGH University of Science and Technology Al. A. Mickiewicza 30 Kraków30-059 Poland National Synchrotron Radiation Centre Solaris Jagiellonian University Ul. Czerwone Maki 98 Kraków30-392 Poland Academic Centre for Materials and Nanotechnology AGH University of Science and Technology Al. A. Mickiewicza 30 Kraków30-059 Poland

Titanium dioxide TiO2, considered to be one of the most favorable candidates for photoanodes in water photolysis, suffers from short lifetime of photogenerated charge carries and mismatch between the solar and TiO2 absorption spectra. These two serious disadvantages can be overcome by tailoring surface properties, which affect charge carrier generation and their transport towards interfaces. In this work, titanium oxide thin films were deposited by RF magnetron sputtering of Ti metallic target in flow-controlled O2+Ar atmosphere. Comprehensive investigation of crystallographic structure, phase composition, morphology and optical properties was performed by means of X-ray diffraction, X-ray reflectivity, scanning electron microscopy, optical spectrophotometry, and X-ray photoemission spectroscopy. Special emphasis was given to soft X-ray absorption spectroscopy results, which provide simultaneous information on electronic occupancy and local atomic structure. Ultimately, performance of films as photoanodes in photoelectrochemical cells (PEC) was assessed by photocurrent vs potential measurements. It was found that as the O2/(O2+Ar) flow ratio increases, the microstructure of thin films changes from lower oxides to rutile, rutile-anatase mixture and, finally, to pure anatase. Results reveal that crystallized, stoichiometric films containing a mixture of anatase and rutile are promising photoanode materials in PEC for green hydrogen generation. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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Influence of extrinsic properties on magnetism and magnetotransport in Mn doped Bi2Te3 topological insulator with self-organized MnBi2Te4 layers 14

Influence of extrinsic properties on magnetism and magnetotr...

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Metamaterials XIV 2023

作者： Sitnicka, J. Park, K. Konczykowski, M. Sobczak, K. Borysiuk, J. Skupiński, P. Grasza, K. Adamus, Z. Reszka, A. Tokarczyk, M. Olszowska, N. Kolodziej, J. Kowalski, B.J. Krusin-Elbaum, L. Wolos, A. Faculty of Physics University of Warsaw ul. Pasteura 5 Warsaw Poland Department of Physics Virginia Tech 850 West Campus Drive BlacksburgVA24061 United States Laboratoire des Solides Irradiés Ecole Polytechnique CNRS PalaiseauF-91128 France Faculty of Chemistry CNBCh University of Warsaw Zwirki i Wigury 101 Warsaw Poland Institute of Physics PAS Aleja Lotników 32/46 Warsaw Poland National Synchrotron Radiation Centre SOLARIS Jagiellonian University ul. Czerwone Maki 98 Cracow30-392 Poland Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University ul. prof. Stanislawa Lojasiewicza 11 Cracow30-348 Poland Department of Physics The City College of New York–CUNY 85 St. Nicholas Terrace New YorkNY10027 United States

ISBN: (纸本)9781510662568

Magnetic topological insulators are a new class of materials that combine magnetism with topology, which leads to exotic quantum phenomena such as the quantum anomalous Hall effect and the axion insulator phase. Of the magnetic topological insulators, those with MnBi2Te4 magnetic septuple layers self-assembled in a non-magnetic topological Bi2Te3 host material are of particular interest and have recently been extensively studied. Here, we present an overview of our recent advances in understanding the influence of several factors such as the ordering of Mn impurities, omnipresent magnetic disorder, and the position of the Fermi level on ferromagnetism and magnetotransport in such systems. In particular, the consequences of these effects for observation or lack of the quantized anomalous Hall effect are discussed. Both theoretical and experimental research on these issues is crucial for gaining controllable access to the quantum anomalous Hall effect and other spintronic phenomena, which have potential applications in low-power consumption electronic devices, data storage, and quantum computing. © 2023 SPIE.

关键词： Bismuth compounds

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