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Journal articles on the topic 'Twisted magnets'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Song, Tiancheng, Qi-Chao Sun, Eric Anderson, et al. "Direct visualization of magnetic domains and moiré magnetism in twisted 2D magnets." Science 374, no. 6571 (2021): 1140–44. http://dx.doi.org/10.1126/science.abj7478.

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Imaging twisty magnets Twisting monolayers of graphene with respect to each other has led to a number of unusual correlated states. This approach has inspired researchers to try their hand at twisting two-dimensional (2D) magnets, but such experiments have proven a difficult challenge. Song et al . made structures out of layers of the 2D magnet chromium triiodide with a small twist angle (see the Perspective by Lado). Using nitrogen vacancy centers in diamond as a magnetometer, the authors imaged the magnetic domains in both twisted monolayer and twisted trilayer structures. For twisted trilayers, a periodic pattern of ferromagnetic and antiferromagnetic domains was revealed. —JS

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2

Chandra, P., and P. Coleman. "TWISTED MAGNETS AND TWISTED SUPERFLUIDS." International Journal of Modern Physics B 03, no. 12 (1989): 1729–53. http://dx.doi.org/10.1142/s0217979289001111.

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We present a quantum fluids approach to incommensurate magnetic structures, emphasizing the close analogies between spin and neutral superfluidity. In particular we show that in twisted magnets the spin superfluid phase stiffness determines the long-wavelength behavior, and that there exists the spin analogue of the roton. We conclude with a brief discussion of charge fluctuation effects, and the possibility of twisted superconductors with mixed parity pairs.

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3

Inglis, Ross, Constantinos J. Milios, Leigh F. Jones, Stergios Piligkos, and Euan K. Brechin. "Twisted molecular magnets." Chem. Commun. 48, no. 2 (2012): 181–90. http://dx.doi.org/10.1039/c1cc13558a.

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4

Inglis, Ross, Constantinos J. Milios, Leigh F. Jones, Stergios Piligkos, and Euan K. Brechin. "ChemInform Abstract: Twisted Molecular Magnets." ChemInform 43, no. 15 (2012): no. http://dx.doi.org/10.1002/chin.201215271.

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5

Hejazi, Kasra, Zhu-Xi Luo, and Leon Balents. "Noncollinear phases in moiré magnets." Proceedings of the National Academy of Sciences 117, no. 20 (2020): 10721–26. http://dx.doi.org/10.1073/pnas.2000347117.

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We introduce a general framework to study moiré structures of two-dimensional Van der Waals magnets using continuum field theory. The formalism eliminates quasiperiodicity and allows a full understanding of magnetic structures and their excitations. In particular, we analyze in detail twisted bilayers of Néel antiferromagnets on the honeycomb lattice. A rich phase diagram with noncollinear twisted phases is obtained, and spin waves are further calculated. Direct extensions to zigzag antiferromagnets and ferromagnets are also presented. We anticipate the results and formalism demonstrated to lead to a broad range of applications to both fundamental research and experiments.

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6

Clery, Daniel. "Stellarators, once fusion’s dark horse, hit their stride." Science 388, no. 6742 (2025): 14–15. https://doi.org/10.1126/science.adx9092.

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7

Yang, Baishun, Yang Li, Hongjun Xiang, Haiqing Lin, and Bing Huang. "Moiré magnetic exchange interactions in twisted magnets." Nature Computational Science 3, no. 4 (2023): 314–20. http://dx.doi.org/10.1038/s43588-023-00430-5.

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8

Zhu, Xingchuan, Huaiming Guo, and Shiping Feng. "Magnon bands in twisted bilayer honeycomb quantum magnets*." Chinese Physics B 30, no. 7 (2021): 077505. http://dx.doi.org/10.1088/1674-1056/abeee5.

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9

Ganor, Yaniv, Traian Dumitrică, Fan Feng, and Richard D. James. "Zig-zag twins and helical phase transformations." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2066 (2016): 20150208. http://dx.doi.org/10.1098/rsta.2015.0208.

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We demonstrate the large bending deformation induced by an array of permanent magnets (applied field ∼0.02 T) designed to minimize poles in the bent state of the crystal. Planar cantilevers of NiMnGa (5M modulated martensite) ferromagnetic shape memory alloy deform into an arched shape according to theory, with a zig-zag microstructure that complies with the kinematic and magnetic compatibility between adjacent twin variants. A general theory of bent and twisted states is given, applicable to both twinning and austenite/martensite transformations. Some of these configurations achieve order-of-magnitude amplification of rotation and axial strain. We investigate also atomistic analogues of these bent and twisted configurations with perfect interfaces between phases. These mechanisms of large deformation, induced by small magnetic fields or temperature changes, have potential application to the development of new actuation technologies for micro-robotic systems.

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10

Allen, Nathaniel C., Federica Pierro, Zijia Zhao, Luisa Chiesa, and Makoto Takayasu. "Structural Finite Element Evaluation of Twisted Stacked-Tape Cables for High-Field Magnets." IEEE Transactions on Applied Superconductivity 27, no. 4 (2017): 1–5. http://dx.doi.org/10.1109/tasc.2017.2652304.

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11

Matt, Benjamin, Kirsten M. Pondman, Sarah J. Asshoff, Bennie ten Haken, Benoit Fleury, and Nathalie Katsonis. "Soft Magnets from the Self-Organization of Magnetic Nanoparticles in Twisted Liquid Crystals." Angewandte Chemie 126, no. 46 (2014): 12654–58. http://dx.doi.org/10.1002/ange.201404312.

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12

Uglietti, Davide, Rui Kang, Rainer Wesche, and Francesco Grilli. "Non-twisted stacks of coated conductors for magnets: Analysis of inductance and AC losses." Cryogenics 110 (September 2020): 103118. http://dx.doi.org/10.1016/j.cryogenics.2020.103118.

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13

Milios, Constantinos J., Stergios Piligkos, and Euan K. Brechin. "Ground state spin-switching via targeted structural distortion: twisted single-molecule magnets from derivatised salicylaldoximes." Dalton Trans., no. 14 (2008): 1809–17. http://dx.doi.org/10.1039/b716355j.

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14

Takayasu, Makoto, Luisa Chiesa, Patrick D. Noyes, and Joseph V. Minervini. "Investigation of HTS Twisted Stacked-Tape Cable (TSTC) Conductor for High-Field, High-Current Fusion Magnets." IEEE Transactions on Applied Superconductivity 27, no. 4 (2017): 1–5. http://dx.doi.org/10.1109/tasc.2017.2652328.

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15

Zheng, Fengshan, Nikolai S. Kiselev, Filipp N. Rybakov, et al. "Hopfion rings in a cubic chiral magnet." Nature 623, no. 7988 (2023): 718–23. http://dx.doi.org/10.1038/s41586-023-06658-5.

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AbstractMagnetic skyrmions and hopfions are topological solitons1—well-localized field configurations that have gained considerable attention over the past decade owing to their unique particle-like properties, which make them promising objects for spintronic applications. Skyrmions2,3 are two-dimensional solitons resembling vortex-like string structures that can penetrate an entire sample. Hopfions4–9 are three-dimensional solitons confined within a magnetic sample volume and can be considered as closed twisted skyrmion strings that take the shape of a ring in the simplest case. Despite extensive research on magnetic skyrmions, the direct observation of magnetic hopfions is challenging10 and has only been reported in a synthetic material11. Here we present direct observations of hopfions in crystals. In our experiment, we use transmission electron microscopy to observe hopfions forming coupled states with skyrmion strings in B20-type FeGe plates. We provide a protocol for nucleating such hopfion rings, which we verify using Lorentz imaging and electron holography. Our results are highly reproducible and in full agreement with micromagnetic simulations. We provide a unified skyrmion–hopfion homotopy classification and offer insight into the diversity of topological solitons in three-dimensional chiral magnets.

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Kajiwara, Takashi, Hiroki Tanaka, and Masahiro Yamashita. "Single-chain magnets constructed with a twisting arrangement of the easy-plane of iron(II) ions." Pure and Applied Chemistry 80, no. 11 (2008): 2297–308. http://dx.doi.org/10.1351/pac200880112297.

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A novel class of single-chain magnets (SCMs), catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 and its derivative, were synthesized using the spin-carrier components possessing hard-axis anisotropy (or easy-plane anisotropy, D > 0). The easy-axis-type anisotropy of whole molecules of these compounds, which is essential for the formation of SCMs, arises from the twisted arrangement of easy-planes of Fe(II) along the chain axis. Alternating high-spin Fe(II) and low-spin Fe(III) chain complexes behave as an SCM with a typical frequency-dependent ac susceptibility which obeys Arrhenius law. Below 7 K, catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 showed a short-range spin-ordering even in zero external field in a time range of Mössbauer spectroscopy as well as the muon-spin-relaxation (μSR) spectroscopy. Since the easy-axis-type magnetic anisotropy originated from the structural motif of the twisting arrangement of Fe(II) ions, the overall magnetic property was very sensitive to the small structural changes arising from adsorption/desorption of the crystal solvents, and catena-[FeII(ClO4)2{FeIII(bpca)2}]ClO4 showed a reversible change in magnetism that has been referred to as "a magnetic sponge". In its derivative, controls of the molecular structure, the arrangement of chains in the crystal, and magnetic properties both in dc and ac susceptibility have been achieved by the introduction of methyl group on a bpca- ligand, which bridges and mediates the magnetic interaction of the adjoining Fe(II)/Fe(III) ions.

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17

LI, YINGXU, XU WANG, and YUANWEN GAO. "COMPUTATIONAL METHOD FOR ELASTIC–PLASTIC AND ANISOTROPIC SUPERCONDUCTING CABLE UNDER SIMPLE LOAD." International Journal of Computational Methods 11, supp01 (2014): 1344006. http://dx.doi.org/10.1142/s0219876213440064.

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International Thermonuclear Experimental Reactor (ITER) Cable-in-conduit Conductor (CICC) presents a typical hierarchical twisted configuration. An unpredictable stress–strain distribution is generated in each-level subcable under experimental loading tests or realistic operating conditions. The mechanical response relates to the threshold of transport currents on CICC which indicates the performance and stability of ITER magnets. To quantitatively assess mechanical deformation we develop an analytical scheme based on the hierarchical approach in the classical wire rope theory, following a successive top-down algorithm from the highest cable level to the lowest. The determination and evaluation of complex contact occurrence among adjacent strands is a key aspect which is formulated via a friction–contact model. Finite element (FE) method is used to extend the analytical approach that treats only elastic and isotropic material to the anisotropy and plasticity. The results show that the interstrand friction acts as a moderation for the axial deformation, and the interaction among the conductors has a stronger impact on the cable deformation than that between the conductor and jacket. It is suggested that under tensile load, the displacement constraints at the end and the strand anisotropy help to reduce the cable longitudinal deformation. It is also recommended that increasing the subsequent pitch is beneficial to reducing the cable deformation level.

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18

Raza, Arsen, Adele Mucci, Alessio Nicolini та Andrea Cornia. "Structural Diversity of Lithium Oligo-α-Pyridylamides". Chemistry 4, № 2 (2022): 520–34. http://dx.doi.org/10.3390/chemistry4020037.

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Lithium oligo-α-pyridylamides are useful intermediates in coordination chemistry. Upon trans-metalation they have afforded a variety of extended metal atom chains (EMACs), which are currently investigated as molecular wires and single-molecule magnets. However, structural information on this class of compounds is scarce. Two trilithium salts of a new, sterically encumbered oligo-α-pyridylamido ligand were isolated in crystalline form and structurally characterized in the solid state and in solution. Lithiation of N2-(trimethylsilyl)-N6-{6-[(trimethylsilyl)amino]pyridin-2-yl}pyridine-2,6-diamine (H3L) with n-BuLi in thf yielded dimeric adduct [Li6L2(thf)6] (1), which was crystallized from n-hexane/thf as 1·C6H14. Crystals of a tetra-thf solvate with formula [Li6L2(thf)4] (2) were also obtained. The compounds feature two twisted L3− ligands exhibiting a cis-cis conformation and whose five nitrogen donors are all engaged in metal coordination. The six Li+ ions per molecule display coordination numbers ranging from 3 to 5. Compound 1·C6H14 was investigated by multinuclear 1D and 2D NMR spectroscopy, including 1H DOSY experiments, which indicated retention of the dimeric structure in benzene-d6 solution. To the best of our knowledge, 1 and 2 are the longest-chain lithium oligo-α-pyridylamides structurally authenticated so far, thereby qualifying as appealing intermediates to access high-nuclearity EMACs by trans-metalation.

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19

Ravish Sharma, Rudraksh Tiwari, Kash Dev Sharma, Himmat Singh Mahor, and Khusvant Singh. "Evaluating the Viability and Optimization of Plasma Pilot Plants." International Research Journal on Advanced Engineering and Management (IRJAEM) 2, no. 09 (2024): 2903–10. http://dx.doi.org/10.47392/irjaem.2024.0428.

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Nuclear fusion stands as a promising avenue for achieving a sustainable and abundant energy source. Central to this endeavor is the development of effective pilot plants capable of demonstrating the feasibility of fusion power on a commercial scale. This paper provides a comprehensive evaluation of three leading magnetic confinement fusion configurations: the Advanced Tokamak (AT), Spherical Tokamak (ST), and Compact Stellarator (CS).The Tokamak, characterized by its toroidal shape and strong magnetic fields, has been the most researched and developed fusion device. The analysis focuses on the challenges related to maintaining stability and minimizing disruptions. Furthermore, the optimization strategies involving advanced materials, superconducting magnets, and innovative plasma control techniques are discussed to enhance the Tokamak's viability. In contrast, the Spherical Tokamak, a variant with a more compact and spherical design, promises improved current advancements including the handling of higher heat loads and magnetic field configurations. The Stellarator, with its complex, twisted magnetic field structure, eliminates the need for continuous external current drive, addressing some intrinsic issues of the Tokamak. By comparing these configurations, the paper identifies the relative strengths and weaknesses of each approach in terms of confinement efficiency, operational stability, and engineering feasibility. The evaluation is supported by recent experimental data, simulation results, and technological advancements. Finally, the paper proposes a roadmap for the future development of fusion pilot plants, highlighting the need for an integrated approach that leverages the strengths of each configuration while addressing their individual challenges. The synthesis of this evaluation underscores the importance of continued research, cross-collaboration, and investment in advanced technologies to realize the goal of practical and economically viable fusion energy. This comparative analysis aims to provide a strategic framework for policymakers, researchers, and engineers in the fusion community, fostering informed decisions and prioritizing research efforts towards the most promising fusion energy configurations.

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20

Oshovskyі, Viktor, Igor Kapura, and Oleksandr Shostak. "Prospects of Modern Methods of Butt Welding for the Manufacture of Blanks and Repair of Crankshafts." National Interagency Scientific and Technical Collection of Works. Design, Production and Exploitation of Agricultural Machines, no. 54 (2024): 3–11. https://doi.org/10.32515/2414-3820.2024.54.3-11.

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The purpose of the study is to analyze modern productive automated methods of electrostatic welding that are promising for technologies for manufacturing blanks or repairing steel crankshafts from prefabricated parts to replace stamping, forging, and other unproductive methods, as well as to increase material utilization, quality, reliability, and the possibility of implementing these methods at engine-building enterprises. It is noted that the existing stamping methods cause shape deviations when the crankshafts are twisted. And when forging large shafts, due to the need to simplify the workpiece, adjacent jowls and connecting rods are combined with large overlaps, which contribute to a very low material utilization rate, a decrease in reliability due to fiber cutting when they are cut. In addition, there are shape errors in the heat treatment process of crankshafts - bending of the workpiece, which is a very time-consuming and costly operation, “turning the crank arm over” during the settling process, which is determined as the main defect in the shaft shape. The manufacture of large shafts requires specialized enterprises with unique pressing equipment and highly qualified workers. It is proposed to manufacture crankshafts from prefabricated journals with half journals, or journals and journals by modern methods of electrostatic welding, automated by computer control - small shafts with pulsating melting; and large shafts with melting by a controlled arc rotating in an Archimedean spiral under the action of a radial magnetic field of solenoids. To increase efficiency, it is proposed to further enhance the magnetic induction of the field with neodymium magnets. The proposed methods of manufacturing and repairing crankshafts will increase the material utilization rate to the maximum, reduce shaft shape errors by eliminating heat treatment after manufacturing or repair, obtain high quality and reliability of shafts, and automate the manufacturing process.

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Петухова, Анастасия, Anastasia Petukhova, Станислав Петухов, and Stanislav Petukhov. "Toroidal models of magnetic field with twisted structure." Solar-Terrestrial Physics 5, no. 2 (2019): 69–75. http://dx.doi.org/10.12737/stp-52201910.

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We present and discuss properties of the following magnetic field models in a magnetic cloud: Miller and Turner solution, modified Miller–Turner solution, Romashets–Vandas toroidal and integral models, and Krittinatham–Ruffolo model. Helicity of the magnetic field in all the models is the main feature of magnetic clouds. The first three models describe the magnetic field inside an ideal torus. In the integral model, parameters of a generating torus ambiguously determine the volume and form of the magnetic field region. In the Krittinatham–Ruffolo model, the cross-section radius of the torus is variable, thereby it corresponds more closely to the real form of magnetic clouds in the inner heliosphere. These models can be used to interpret in-situ observations of the magnetic flux rope, to study a Forbush decrease in magnetic clouds and transport effects of solar energetic particles injected into a coronal mass ejection.

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22

Chizhikov, V. A., and V. E. Dmitrienko. "Microscopic description of twisted magnet Cu2OSeO3." Journal of Magnetism and Magnetic Materials 382 (May 2015): 142–51. http://dx.doi.org/10.1016/j.jmmm.2015.01.032.

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23

Zadorozhnii, V. I., K. V. Bashtova, V. Yu Reshetnyak, and T. J. Sluckin. "Magneto-Optical Response of Twisted Ferronematic Cells." Molecular Crystals and Liquid Crystals 526, no. 1 (2010): 38–45. http://dx.doi.org/10.1080/15421406.2010.485066.

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24

Bailey, S. W. D., D. Tománek, Y. K. Kwon, and C. J. Lambert. "Giant magneto-conductance in twisted carbon nanotubes." Europhysics Letters (EPL) 59, no. 1 (2002): 75–80. http://dx.doi.org/10.1209/epl/i2002-00161-8.

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25

Wu, Pey-Shey, Min-Fu Hsieh, Wei Ling Cai, et al. "Heat Transfer and Thermal Management of Interior Permanent Magnet Synchronous Electric Motor." Inventions 4, no. 4 (2019): 69. http://dx.doi.org/10.3390/inventions4040069.

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Geometric complexities and multi-physical phenomena add difficulties for predicting the thermal field and hence thermal management of an electric motor. A numerical design model that combined electromagnetic and thermal-fluid analysis was proposed for disclosing the detailed temperature distributions of each component in an electric motor. The thermal fluid analysis implemented ANSYS-Fluent code to unravel the thermal field of the interior permanent magnet synchronous electric motor fitted with a smooth or novel spirally twisted channel in the cooling water jacket of a stator with and without shaft cooling. In accordance with the thermal powers converted from the various electromagnetic losses of the electric motor, the complex heat conduction model with realistic thermal boundary conditions was formulated. Initially, the turbulent flow structures and channel averaged Nusselt numbers of the spiral channels without and with the sectional twist were comparatively examined for acquiring the convective thermal boundary conditions in the water jacket. With the high thermal conductivity of the aluminum water jacket, the heat-transfer improvements from the smooth-spiral-channel conditions by using the twisted spiral channel were effective for reducing the average temperatures by about 10% but less effective for altering the characteristic thermal field in the water jacket. At 1290 < Dn < 6455 or 5000 < Re < 25,000 for the spiral channel flows, the channel average Nusselt numbers ratios between the smooth and twisted spiral channels were elevated to 1.18–1.09 but decreased with the increase of Dn or Re. A set of heat-transfer correlations for estimating the Nusselt numbers of Taylor flow in the rotor-to-stator air gap was newly devised from the data available in the literature. While the cooling effectiveness of the water jacket and shaft was boosted by the sectional twists along the spiral channel of the water jacket, the presence of Taylor flow in the annual air gap prohibited the effective rotor-to-stator heat transmission, leading to hot spots in the rotor. By way of airflow cooling through the rotating hollow shaft, the high temperatures in the rotor were considerably moderated. As the development of Taylor flow between the rotor and stator was inevitable, the development of active or passive rotor cooling schemes was necessary for extending the power density of an electric motor. Unlike the previous thermal circuit or lumped-parameter thermal model that predicted the overall temperatures of motor components, the present coupled electromagnetic and thermal-fluid model can reveal the detailed temperature distributions in an electric motor to probe the local hot spots of each component in order to avoid overheating at the early design stage.

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Wu, Wei, Robert Sych, Jie Chen, and Jiang-Tao Su. "Magneto-acoustic waves in magnetic twisted flux tubes." Research in Astronomy and Astrophysics 21, no. 5 (2021): 126. http://dx.doi.org/10.1088/1674-4527/21/5/126.

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27

Panina, L. V., T. Kitoh, M. Noda, and K. Mohri. "Bistable Magneto-Impedance Effect in Twisted Amorphous Wire." Journal of the Magnetics Society of Japan 20, no. 2 (1996): 625–28. http://dx.doi.org/10.3379/jmsjmag.20.625.

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28

Cheng, Shih Ping, Chang Chou Hwang, and Chia Ming Chang. "Design Techniques for Reducing Cogging Torque in SPM Motors Using Shifted Slot Opening." Applied Mechanics and Materials 284-287 (January 2013): 692–96. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.692.

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Skewing is one of the most common methods to reduce the cogging torque of permanent magnet synchronous motors. This technique may cause manufacturing troubles such as impossible automatic slot filling due to skewing stator slot. One method to overcome this problem is to use the step twisted stator structure with shifted slot opening. Compared to other methods of skewing, in the presented method, the stator slots are still straight slots and the skewing effect is implemented by shifting slot openings coupled with a step twisted stator design. This paper discusses the use of the step twisted stator structure with shifted slot opening and the associated effects on machine performance. We address the cogging torque, average torque, torque ripple, and back-EMF and its total harmonic distortion (THD). We examine the results using finite element analysis (FEA).

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29

Zuber, J. W., and C. Zhang. "Twist dependent magneto-optical response in twisted bilayer graphene." Journal of Physics: Condensed Matter 33, no. 44 (2021): 445501. http://dx.doi.org/10.1088/1361-648x/ac1c30.

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Erdélyi, Robert, and Viktor Fedun. "Magneto-Acoustic Waves in Compressible Magnetically Twisted Flux Tubes." Solar Physics 263, no. 1-2 (2010): 63–85. http://dx.doi.org/10.1007/s11207-010-9534-3.

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Indenbom, M. V., C. J. van der Beek, V. Berseth, et al. "Magneto-optical observation of twisted vortices in type-II superconductors." Nature 385, no. 6618 (1997): 702–5. http://dx.doi.org/10.1038/385702a0.

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Vemareddy, P. "Simulating the Formation and Eruption of Flux Rope by Magneto-friction Model Driven by Time-dependent Electric Fields." Astrophysical Journal 975, no. 2 (2024): 251. http://dx.doi.org/10.3847/1538-4357/ad8089.

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Abstract Aiming to capture the formation and eruption of flux ropes (FRs) in the source active regions (ARs), we simulate the coronal magnetic field evolution of the AR 11429 employing the time-dependent magneto-friction model (TMF). The initial field is driven by electric fields that are derived from time-sequence photospheric vector magnetic field observations by invoking ad hoc assumptions. The simulated magnetic structure evolves from potential to twisted fields over the course of two days, followed by rise motion in the later evolution, depicting the formation of an FR and its slow eruption later. The magnetic configuration resembles an inverse S-sigmoidal structure, composed of the potential field enveloping the inverse J-shaped fields that are sheared past one another and a low-lying twisted field along the major polarity inversion line. To compare with observations, proxy emission maps based on averaged current density along the field lines are generated from the simulated field. These emission maps exhibit a remarkable one-to-one correspondence with the spatial characteristics in coronal extreme ultraviolet images, especially the filament trace supported by the twisted magnetic field in the southwest subregion. Further, the topological analysis of the simulated field reveals the cospatial flare ribbons with the quasi-separatrix layers, which is consistent with the standard flare models; therefore, the extent of the twist and orientation of the erupting FR is indicated to be the real scenario in this case. The TMF model simulates the coronal field evolution, correctly capturing the formation of the FR in the observed timescale and the twisted field generated from these simulations serves as the initial condition for the full MHD simulations.

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Grilli, Francesco, Victor M. R. Zermeño, and Makoto Takayasu. "Numerical modeling of twisted stacked tape cables for magnet applications." Physica C: Superconductivity and its Applications 518 (November 2015): 122–25. http://dx.doi.org/10.1016/j.physc.2015.03.007.

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Li, Zheng, Jinsong Wang, Shaohua Wang, Shengdi Feng, Yiding Zhu, and Hexu Sun. "Design of Sensorless Speed Control System for Permanent Magnet Linear Synchronous Motor Based on Fuzzy Super-Twisted Sliding Mode Observer." Electronics 11, no. 9 (2022): 1394. http://dx.doi.org/10.3390/electronics11091394.

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To improve the tracking capability and sensorless estimation accuracy of a permanent magnet linear synchronous motor (PMLSM) control system, a sensorless control system based on a continuous terminal sliding mode controller (CT-SMC) and fuzzy super-twisted sliding mode observer (F-ST-SMO) was designed. Compared with a conventional slide mode control, CT-SMC can reach the equilibrium point in limited time to ensure the continuity of control and achieve fast tracking of reference speed. Based on the PMLSM design of F-ST-SMO, a super-twisted sliding mode algorithm is used to replace the traditional first order sliding mode algorithm. Meanwhile, fuzzy rules are introduced to adjust the sliding mode gain adaptively, which replaces the fixed gain of traditional SMO and reduces chattering of the system. Finally, the effectiveness and superiority of the designed control system are proven by simulation and experiment.

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35

Waghode, B. B. "Morphological Analysis of Unstructured and Prestructured Magneto-rheological Elastomer." International Journal for Research in Applied Science and Engineering Technology 9, no. 12 (2021): 153–59. http://dx.doi.org/10.22214/ijraset.2021.39216.

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Abstract: By providing or not put on a magnetic flux, a magneto rheological (MR) elastomer becomes a very powerful and advanced smart material that could be twisted and responded hurriedly in relations of mechanical strength. They are elastomer materials with embedded iron elements in an elastomer environment. Isotropic(unstructured) and anisotropic(prestructured) MR elastomers are categorized built on the submission of a magnetic flux during in the fabrication process. The scattering of magnetizable elements in the medium of an elastomer is well defined and arranged by kind. Scanning Electron Microscopy(SEM) had revealed their shape. They should be employed in a variability of solicitations payable to their improved morphological characteristics, such as pulsation absorbers, isolators, seismic devices, and so on. Keywords: Smart material, magneto rheological elastomer, carbonyl iron particles, morphology, scanning electron microscopy

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Furmanova, T. A., A. S. Antonov, I. N. Morozov, and L. V. Panina. "Effect of dc current on magneto-impedance in CoSiB twisted wires." Sensors and Actuators A: Physical 81, no. 1-3 (2000): 95–97. http://dx.doi.org/10.1016/s0924-4247(99)00094-1.

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37

Hwang, Chang-Chou, Chia-Ming Chang, and Cheng-Tsung Liu. "Cogging Torque Reduction in Permanent Magnet Synchronous Motors Using Twisted Stator." Advanced Science Letters 8, no. 1 (2012): 322–26. http://dx.doi.org/10.1166/asl.2012.2419.

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38

BALLESTEROS, ANGEL. "SYMMETRY, INTEGRABILITY AND DEFORMATIONS OF LONG-RANGE INTERACTING HAMILTONIANS." International Journal of Modern Physics B 13, no. 24n25 (1999): 2903–8. http://dx.doi.org/10.1142/s0217979299002721.

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The notion of coalgebra symmetry in Hamiltonian systems is analysed. It is shown how the complete integrability of some long-range interacting Hamiltonians can be extracted from their associated coalgebra structure with no use of a quantum R-matrix. Within this framework, integrable deformations can be considered as direct consequences of the introduction of coalgebra deformations (quantum algebras). As an example, the Gaudin magnet is derived from a sl(2) coalgebra, and a completely integrable deformation of this Hamiltonian is obtained through a twisted gl(2) quantum algebra.

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39

Gunatilake, Udara Bimendra, Rafael Morales, Lourdes Basabe-Desmonts, and Fernando Benito-Lopez. "Magneto Twister: Magneto Deformation of the Water–Air Interface by a Superhydrophobic Magnetic Nanoparticle Layer." Langmuir 38, no. 11 (2022): 3360–69. http://dx.doi.org/10.1021/acs.langmuir.1c02925.

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40

Udara, Bimendra Gunatilake, Morales Rafael, Basabe-Desmonts Lourdes, and Benito-Lopez Fernando. "Magneto Twister: Magneto Deformation of the Water–Air Interface by a Superhydrophobic Magnetic Nanoparticle Layer." Langmuir 38, no. 11 (2022): 3360–69. https://doi.org/10.1021/acs.langmuir.1c02925.

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This repository contains FTIR, XRD, SQUID and Raman spectra data analysis of the superhydrophobic magnetic nanoparticles (SMNPs). Videos support the main text of the manuscript. FTIR Data Set - Fourier-transform infrared spectroscopy of Fe<sub>3</sub>O<sub>4</sub> and C<sub>8-</sub>Fe<sub>3</sub>O<sub>4</sub> nanoparticles. XRD Data Set- X-ray diffraction analysis of Fe<sub>3</sub>O<sub>4</sub> and C<sub>8-</sub>Fe<sub>3</sub>O<sub>4</sub> nanoparticles. Video SI-5_1: Superhydrophobic magnetic particles on water surface. Video SI-5_2: Formation of the conical spike under magnetic field. Video SI-5_3: Manipulation of the spike. Video SI-5_4: Water droplet transport in aqueous medium (top view). Video SI-5_5: Water droplet transport in aqueous medium (side view). Video SI-5_6: Magneto controllable plug. Video SI-5_7: Trajectory of the polystyrene particle. Video SI-5_8: Removal of polystyrene particle on water.    

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41

Kitoh, T., K. Mohri, and T. Uchiyama. "Asymmetrical magneto-impedance effect in twisted amorphous wires for sensitive magnetic sensors." IEEE Transactions on Magnetics 31, no. 6 (1995): 3137–39. http://dx.doi.org/10.1109/20.490306.

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42

Ahmadi, Ramin, and Mohammad Taghi Ahmadi. "Contact Effect On Twisted Graphene Based Schottky Transistor." ECS Journal of Solid State Science and Technology 11, no. 3 (2022): 031005. http://dx.doi.org/10.1149/2162-8777/ac5eb3.

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Owing to the exceptional electrical properties of different one dimensional (1D) classifications of graphene structure such as graphene nanoribbon (GNR) and twisted graphene (TWG) led to a revolution in nanoelectronic researche and applications. Thus, these materials have been extensively explored in nanoelectronics science and materials. This paper is focused on GNR and TWG junction as metal-semiconductor-metal (MSM) in the form of a transistor. The wave vectors of TWG and GNR based on the geometrical effects are discussed. By considering 1D potential barrier at the junction of TWG as a semiconducting region and GNR as a metallic region, the transmission probability is calculated. Then, the I–V characteristics of GNR-TWG Schottky transistor based on quantum tunneling effect arepresented and discussed, as well. The performance of GNR-TWG Schottky transistor under variation of gate-source voltage, channel length, number of twists, width of GNR, and temperature are investigated. It is concluded that increment in number of twists and width of GNR lead to increasing the drain current and threshold voltage. Finally, comparison study with graphene nanoscroll (GNS) Schottky transistor, trilayer graphene nanoribbon (TGNR) Schottky transistor, and reported experimental data are performed and results represent that GNR-TWG Schottky transistor has larger drain current than these works.

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43

Peng, Jiaying, Hongfei Tao, Hongyu Ni, and Wenxu Yan. "Synchronous control of the robot for repairing broken strands of overhead ground wires." Journal of Physics: Conference Series 2216, no. 1 (2022): 012040. http://dx.doi.org/10.1088/1742-6596/2216/1/012040.

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Abstract Abstarct. Overhead ground wire broken strand repair robot is a new type of electric robot, a complex multi-motor system. Therefore, the problem of synchronous control of each mechanism in the robot needs to be solved. A dual-layer sliding mode control strategy based on a cross-coupled synchronous control structure is proposed from the perspectives of mechanical structure synchronization and algorithm synchronization in this paper. Firstly, a global fast terminal sliding mode controller with single motor is designed for permanent magnet synchronous motor; Secondly, for the dual-motor system in the pre-twisted wire winding mechanism, a cross-coupling control structure is introduced. And a dual-motor synchronous compensation controller is designed in view of the fast non-singular terminal sliding mode combined with the new approximation law; Finally, the simulation verification in MATLAB, the results show that it has a certain improvement on the tracking error and synchronization error of the system. The anti-disturbance ability of the pre-twisted wire winding mechanism against uncertain loads is improved.

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Qi, Wen-Rong, Rui Liu, Ling-Jun Kong, et al. "Double-slit interference of single twisted photons." Chinese Optics Letters 18, no. 10 (2020): 102601. http://dx.doi.org/10.3788/col202018.102601.

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45

Himbele, John J., Arnaud Badel, and Pascal Tixador. "HTS Dipole Magnet for a Particle Accelerator Using a Twisted Stacked Cable." IEEE Transactions on Applied Superconductivity 26, no. 3 (2016): 1–5. http://dx.doi.org/10.1109/tasc.2016.2542058.

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46

Florkowski, Marek, Pawel Blaszczyk, and Pawel Klimczak. "Partial discharges in twisted-pair magnet wires subject to multilevel PWM pulses." IEEE Transactions on Dielectrics and Electrical Insulation 24, no. 4 (2017): 2203–10. http://dx.doi.org/10.1109/tdei.2017.006313.

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47

Kimura, Ken, Sojiro Ushirone, Takahiro Koyanagi, and Masayuki Hikita. "PDIV characteristics of twisted-pair of magnet wires with repetitive impulse voltage." IEEE Transactions on Dielectrics and Electrical Insulation 14, no. 3 (2007): 744–50. http://dx.doi.org/10.1109/tdei.2007.369539.

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48

Florkowski, Marek, Barbara Florkowska, and Pawel Zydron. "Partial Discharges in Insulating Systems of Low Voltage Electric Motors Fed by Power Electronics—Twisted-Pair Samples Evaluation." Energies 12, no. 5 (2019): 768. http://dx.doi.org/10.3390/en12050768.

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Power electronics switching devices currently represent the dominant technology for supplying low voltage (LV) electric motors. The fast switching processes exert a different class of stress on dielectric insulating materials than standard sinusoidal excitations. Such stresses result in an increase in the dynamic activity of the working electric field, which in turn lead to an increased likelihood of partial discharges (PD). The stator design of low voltage motor is often in form of random-wound windings, where the magnet wires (copper or aluminum round wires coated with thin layer of insulation) form a common system of coils with not precisely defined mutual position of particular turns, resulting in various turn-to-turn and coil-to-coil voltage distributions. Pulse Width Modulated (PWM) voltage waveforms from modern electronic inverters are characterized by very short rise times and presence of repetitively occurring overvoltages that can significantly stress the insulation of feeding cables and motors. These factors influence the inception and dynamics of PD and processes of space charge accumulation in electrical insulation. In this paper investigations performed on round magnet wire twisted-pair samples representing LV motor random-wound winding elements are presented. Special attention was afforded to the twist configurations, observed breakdown voltage and PD activity. To describe the field conditions for the formation of PD in the turn-to-turn insulation system, the results of numerical simulations of electric field distributions for winding wires with different diameters, modeled using the COMSOL program, were analyzed. PD created in the insulating systems of model twisted-pair systems were registered and analyzed using the phase resolved partial discharge analysis (PRPDA) method.

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Chen, Sheng. "Unveiling The Unconventional Superconductivity Via Cuprates and Twisted Bilayer Graphene." Highlights in Science, Engineering and Technology 81 (January 26, 2024): 59–68. http://dx.doi.org/10.54097/s30pyd16.

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Since the twentieth century, the exploration of superconducting material, a type of material that exhibits zero electrical resistance, has remained a paramount topic of inquiry within the scientific community seeing its excellent potential in bringing dramatical improvement to the material science and electric power and high-field magnet technology. However, earliest materials with superconducting aptitude requires extreme condition for critical temperature: It needs a temperature close to 0K, which is hard for application. This severe technical issue then led to an exploration to materials with higher temperature to reveal superconductivity. With decades of efforts, despite there are still arguments in working principle, new material like cooper oxide and iron-based material were found to have critical temperature higher than the limit predicted by Bardeen–Cooper–Schrieffer theory. However, recent experiment and accompanying working principle for the superconductivity of twisted layer graphene may suggest that it has greater potential in high temperature superconducting, due to its tunable property and relatively simpler working mechanism.

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50

Wang, Yu, and Zhiquan Deng. "A Multi-Tooth Fault-Tolerant Flux-Switching Permanent-Magnet Machine With Twisted-Rotor." IEEE Transactions on Magnetics 48, no. 10 (2012): 2674–84. http://dx.doi.org/10.1109/tmag.2012.2198921.

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