- by Zansong Tang, JĆ¼rgen E K Schawe and Kiyonori SuzukiMagnetically soft nanostructures have been known to form in a simple FeāB binary system when ultra-rapid annealing (URA) is employed for processing amorphous precursors. The origin of nano-crystallization induced by URA is of fundamental significance. We have predicted in a previous report (Parsons et al 2018 J. Phys. D: Appl. Phys.51 415001) that the onset of primary crystallization in amorphous Fe86B14 is increased beyond the glass transition temperature (Tg) when URA is applied. This could result in accelerated homogeneous nucleation […]
- by Xiaofan Song, Daomin Min, Minhui Zhu, Jinghui Gao, Shihang Wang, Kai Zhang and Xiaoyu QinCable transmission is crucial for long-distance power transfer, connecting regional power grids, and integrating wind farms into the grid, serving as a key element of high-voltage direct current power systems. Nonetheless, during operation, the cross-linked polyethylene (XLPE) insulation layer in cables is frequently subjected to electro-thermal coupled stresses, which significantly impacts the cableās safety and transmission efficiency. This study investigates systematically different types of XLPE samples in terms of their physicochemical and electrical properties. It is found that increasing sample […]
- by Fangpei Li, Wenbo Peng, Guohe Zhang and Yongning HeUp to the present day, a lot of research has focused on strain-modulated piezoelectric semiconductor (piezo-semi) devices, such as the piezo-semi PN junction, piezo-semi PIN junction, and metal piezo-semi contact. However, there has been little research conducted on piezoelectric devices with multilayer structures, such as the piezoelectric bipolar junction transistor (BJT). Recently, our group has conducted experimental research on multilayer piezoelectric optoelectronic devices. Results show that the multilayer structure can significantly improve the optoelectronic properties of the device. This is […]
- by Umakanta Patra, Subhrajit Sikdar, Roshan Padhan, Amandeep Kaur, Satyaprakash Sahoo and Subhabrata DharDemand for lower computing power has rapidly increased. In this context, brain-inspired neuromorphic computing, which integrates data storage and processing, has attracted significant attention. Here, our study reveals that field effect transistors fabricated on chemical vapor deposited bilayer (2L) MoS2 films can mimic the functions of biological synapse. These devices demonstrate high levels of pair pulse facilitation, short term to long term memory (STM-to-LTM) transition as well as learning-forgetting-relearning properties. The effects of light intensity, pulse number, pulse width and […]
- by Garima Arora, Petr BĆlek, JiÅĆ Fujera, Petr Hoffer, VĆ”clav Prukner and Milan Å imekIn this study, we investigated time- and space-resolved plasma emissions generated by reflected high-voltage (HV) pulses in deionised water to determine the electron density. HV pulses with a 3.5āns rise time and 160ākV amplitude were applied in a point-to-plane electrode geometry under single-shot conditions. The primary pulse, delivered to the chamber through a coaxial cable, produced a series of reflected pulses owing to load mismatch. Optical emission characteristics were recorded and resolved spatio-temporally across visible and near-infrared spectral regions. High-speed […]
- by Mohammed Alsawafta, Mohd Alothoum and Obadah S Abdel-RahmanMetalāoxide coreāshell nanostructures offer a promising route for coupling plasmonic absorption with catalytic oxide functionality; however, a predictive and quantitative framework linking geometry to solarāphoton harvesting in Pd-based systems remains lacking. Here, we present a systematic finite-difference time-domain investigation of Pd@CeO2 nanoparticles that explicitly correlates core radius (r) and shell thickness (t) with hybrid-mode formation, near-field redistribution, and solar harvesting metrics. We show that electromagnetic coupling between the Pd core and the high-index CeO2 shell produces two distinct hybrid resonancesāa […]
- by Daolin Qu, Xin Lin, Keli Gao, Xianglian Yan, Wen Wang, Zhenxin Geng, Jianyuan Xu and Yao YaoAs a promising and environmentally benign alternative to SF6, perfluoroisobutyronitrile (C4F7N) shows great potential for high-voltage switchgear. Owing to its relatively high liquefaction temperature, C4F7N must be mixed with buffer gases in practical applications. To develop environmentally friendly gas media with enhanced arc-quenching performance, it is therefore essential to investigate the influence of different buffer gases on the arc behaviour of C4F7N-based gas mixtures. In this study, a two-dimensional magnetohydrodynamic arc model is established based on a 40.5 kV circuit […]
- by S Gershman, M N Shneider and Y RaitsesDecomposition of methane using non-thermal plasmas is an attractive route for producing hydrogen-rich gases and valuable carbon nanomaterials. Understanding how plasma discharge modes influence methane decomposition in optimizing plasma-assisted chemical conversion remains unexplored. This study explores the coupling between the discharge structure and product selectivity in RF capacitively coupled discharges operating in methane/inert gas mixtures in the pressure range of 2ā3 torr. Under our experimental conditions the discharge exhibits mode transitions from uniform to striated in Ar and Kr and […]
- by K Lakaal, L M PĆ©rez, V Prasad, D Laroze, V Chaudhary, W J Pasek, A En Naciri, A El Fatimy and E FeddiThis work investigates the magneto-transport and magnetocaloric properties of interacting holes in highly Mn-doped (Ga,Mn)As. The model includes holeālongitudinal optical phonon coupling and analyzes the effects of temperature (0ā50 K) and magnetic field (ā5 to 5 T). The energy spectrum is obtained from the Schrƶdinger equation, and thermodynamic properties are evaluated using BoltzmannāGibbs statistics. The formalism and numerical calculation are applied to (Ga0.97Mn0.03As) containing Mn. The magnetic susceptibility behavior indicates that antiferromagnetic interactions are associated with ferromagnetic order in (Ga,Mn)As […]
- by Xinyao Zhang, Can Gong, Minhan Mi, Yuwei Zhou, Ting Meng, Tianhao Liu, Yu Hao, Xiaohua Ma and Yue HaoThis work presents a highly linear double-channel deviceāAlGaN/GaN/graded-AlGaN:Si-doped/GaN double-channel (GDCS) HEMT. By combining Si-doping with a graded barrier design, the structure significantly reduces the barrier height between the channels and enhances channel electron coupling effect under the gate. At Vd = 10 V, the device achieves high current density with a flattened transconductance (gm) profile. Small-signal measurements demonstrate a gate-voltage swing of 5.4 V for both current-gain cutoff frequency (fT) and power-gain cutoff frequency (fMAX), indicating excellent gain linearity. In […]
- by Dimitrios C Zografopoulos, Edoardo Negri, Tiziana Ritacco, Romeo Beccherelli and Walter FuscaldoTerahertz (THz) science is widely recognized as the new frontier of applied electromagnetics, bridging the gap between microwave- and photonics-based applications. THz radiation, spanning frequencies over three orders of magnitude, namely from 0.1āTHz to 10āTHz, combines the advantages of a submillimetric wavelength with a centimeter scale penetration depth while featuring a non-ionizing character. This unique combination cannot be found elsewhere in the frequency spectrum, yet it exactly matches the demand of imaging applications in diverse fields such as material characterization, […]
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