Journal of Physics D: Applied Physics

• Origin of soft magnetic nanostructures in an Fe–B binary system revealed by ultra-rapid calorimetry
  March 13, 2026 by Zansong Tang, Jürgen E K Schawe and Kiyonori Suzuki
  Magnetically soft nanostructures have been known to form in a simple Fe–B 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 […]
• Spectral overlap integral and photon flux-guided design of Pd@CeO2 nanostructures for efficient solar photocatalysis
  March 11, 2026 by Mohammed Alsawafta, Mohd Alothoum and Obadah S Abdel-Rahman
  Metal–oxide core–shell nanostructures offer a promising route for coupling plasmonic absorption with catalytic oxide functionality; however, a predictive and quantitative framework linking geometry to solar‐photon 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 resonances—a […]
• Influence of buffer gas on arc cooling and post-arc recovery in C4F7N-based gas mixture circuit breakers
  March 11, 2026 by Daolin Qu, Xin Lin, Keli Gao, Xianglian Yan, Wen Wang, Zhenxin Geng, Jianyuan Xu and Yao Yao
  As 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 […]
• Decomposition of methane diluted with inert gas in an RF discharge cell
  March 11, 2026 by S Gershman, M N Shneider and Y Raitses
  Decomposition 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 2–3 torr. Under our experimental conditions the discharge exhibits mode transitions from uniform to striated in Ar and Kr and […]
• Magneto-transport and magnetocaloric properties of highly doped (Ga,Mn)As DMS confined systems
  March 10, 2026 by K Lakaal, L M Pérez, V Prasad, D Laroze, V Chaudhary, W J Pasek, A En Naciri, A El Fatimy and E Feddi
  This work investigates the magneto-transport and magnetocaloric properties of interacting holes in highly Mn-doped (Ga,Mn)As. The model includes hole–longitudinal optical phonon coupling and analyzes the effects of temperature (0–50 K) and magnetic field (−5 to 5 T). The energy spectrum is obtained from the Schrödinger equation, and thermodynamic properties are evaluated using Boltzmann–Gibbs 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 […]
• Linearity enhancement of AlGaN/GaN/graded-Al0.1–0.25 GaN: Si-doped/GaN double channel HEMT
  March 10, 2026 by Xinyao Zhang, Can Gong, Minhan Mi, Yuwei Zhou, Ting Meng, Tianhao Liu, Yu Hao, Xiaohua Ma and Yue Hao
  This work presents a highly linear double-channel device—AlGaN/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 […]
• An overview of imaging techniques and applications based on terahertz time-domain spectroscopy
  March 10, 2026 by Dimitrios C Zografopoulos, Edoardo Negri, Tiziana Ritacco, Romeo Beccherelli and Walter Fuscaldo
  Terahertz (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 0.1 THz to 10 THz, 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, […]
• Anharmonic lattice dynamics study of phonon transport in layered and molecular-crystal indium iodides
  March 9, 2026 by Takuma Shiga, Yoshikazu Mizuguchi and Hiroshi Fujihisa
  Indium iodides, which adopt layered or molecular-crystal-like arrangements depending on composition, are expected to exhibit low lattice thermal conductivity because of their heavy constituent atoms and weak In–I bonding. In this work, we employed first-principles anharmonic lattice dynamics calculations to systematically investigate phonon transport in indium iodides from particle- and wave-like perspectives. The calculated lattice thermal conductivities of both materials remained below 1 W m−1 K−1 over a broad temperature range. Notably, the influence of wave-like phonon transport differed by […]
• In-situ determination of the effective secondary electron emission coefficient in helium and neon capacitively coupled RF plasmas
  March 9, 2026 by Ranna Masheyeva, Aranka Derzsi, Karlygash Dzhumagulova, Murat Myrzaly, Zoltán Donkó and Peter Hartmann
  Building on our previous study in argon gas, we extend our approach to helium and neon capacitively coupled plasmas, which allows the effective secondary-electron emission coefficient (SEEC, γ) to be determined in-situ under discharge operation. The method relies on the γ-dependence of the DC self-bias voltage, which arises due to the electrical asymmetry effect (EAE). The EAE is induced by applying two consecutive radio-frequency harmonics with a variable phase angle to excite the discharge. Experimental measurements of the DC self-bias […]
• AC field driven interactions in concentrated electrolytes
  March 9, 2026 by Carla S Perez-Martinez, Timothy S Groves, Marco Balabajew, Christian D van Engers, Nico Cousens, Florian Hausen, Alexander M Smith and Susan Perkin
  Using a surface force balance, we measure the force between two crossed-cylinder electrodes for different electrolyte systems and different geometrical configurations under the influence of an AC field. When an AC field is applied to concentrated mixtures of an ionic liquid (IL) in a polar solvent, a force arises that is at least an order of magnitude larger and slower to reach steady state than the static response of the electrolyte. We demonstrate that this AC field effect persists in […]

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