- by Dipankar Pokhrel, Somnath Sahu and D PamuDouble perovskites of the type are known for their high dielectric constants at low frequencies, but their performance typically declines at higher frequencies, limiting their suitability for advanced electronic applications. This study explores the effect of substituting nickel for cobalt in to improve stability at higher frequencies. Compositions with 10% and 15% nickel were prepared and examined for structural, chemical, and electrical behavior. The sample with 10% nickel substitution exhibited a markedly enhanced dielectric constant ( at 1 kHz) and retained […]
- by J Z SunElectronic tunneling is a fundamentally quantum mechanical phenomenon. In a magnetic tunnel junction (MTJ), the tunnel conductance is further dependent on the electron’s spin state, adding another degree of freedom and leading to spin orientation-dependent tunnel resistance—known as tunnel magnetoresistance (TMR). In addition to the charge current, a spin-polarized tunnel current carries spin angular momentum flow. These two unique attributes, spin-dependent magnetoresistance and spin-current flow, bring a nano-MTJ capable of performing both read and write operations in a charge current-controlled […]
- by Lijun Wang, Xiangyu Wang, Zhuo Chen, Runze Hu, Xianzhe Li and Ruibo ShiTo study the restrike process of vacuum circuit breaker (VCB), this paper establishes a two-dimensional Particle-in-Cell/Monte Carlo collision (PIC/MCC) model applicable to the post-arc reignition process, and conducts a simulation investigation on the post-arc reignition phenomenon during the evolution of residual plasma after the termination of the vacuum arc burning phase. The simulation incorporates the thermal electron emission process of the post-arc cathode (anode in arc stage), collision behaviors between electrons and copper atoms/ions, and charge exchange processes. Meanwhile, this […]
- by Sung-il Chung, Tae-Weon Kang, Pan Kyeom Kim, In-June Hwang, Tae-gyu Ha and Young-Pyo HongAs autonomous driving technologies become more prevalent, radar sensors can potentially interfere with the safety systems of surrounding vehicles. In this study, we introduce a transparent metasurface absorber (MA) with a shielding effectiveness (SE) of over 40 dB and absorption performance exceeding 90% within the 76–81 GHz range. The MA comprises a metal-mesh-shaped resonator layer, a ground layer, and a polyethylene terephthalate-based dielectric layer. The resonator layer comprises two disk-shaped patterns, each filled with an internal micromesh structure, with sizes […]
- by Zhonghang Ji, Yida Song, Qiong Zhang and Yunqing LiuMetamaterial absorbers have widespread applications in fields such as communication, electromagnetic stealth, and electromagnetic interference due to their unique electromagnetic properties. This paper propose a flexible metamaterial absorber with indium tin oxide as the resonant element and PTFE as the substrate material. The absorber exhibits an absorption rate exceeding 90% across the frequency range of 11.65–75 GHz, with a maximum absorption bandwidth of 63.35 GHz, covering the Ku, K, Ka, U, and V bands. The structure is insensitive to polarization […]
- by Radha Krishna Murthy Bulusu, Ethan Wood, Robert J Wandell and Bruce R LockeA continuous gas–liquid flowing film reactor powered by a nanosecond pulsed power supply was used to generate NO and NO2, which were measured in the gas phase, and H2O2, NO2−, and NO3−were measured in the liquid phase, using air as the carrier gas and deionized liquid water. The pulse repetition frequency was varied between 1–10 kHz, with a constant pulse width and input voltage of 40 ns and 16 kV, respectively. The liquid phase was quenched using sodium azide and […]
- by Enzhong Song, Wang Yinan, Dongshan Su, Yuanhang Wang and Zhibo MaWideband high-sensitivity detection of low-frequency magnetic fields remains challenging owing to the strong frequency dependence of the magnetoelectric (ME) coefficient and the high quality factor of the layered ME sensors. Here, we proposed a high-performance cylindrical ME sensor and utilize frequency conversion to up-convert the signal to mechanical resonance, thereby enhancing the detection performance for low-frequency magnetic fields. The ME sensor consisted of an axially polarized cylindrical piezoelectric ceramic PZT-5 A and an axially magnetized magnetostrictive Fe81Ga19 (FeGa) tube. The […]
- by Yao Li, Ke Zhang, Xinghuan Chen, Yunfeng Hu, Zhiyuan He, Zongqi Cai, Yijun Shi, Yuan Chen, Guoguang Lu and Liang HeThis paper systematically investigates the non-uniform dynamic on-resistance (RDS,ON) behaviors with OFF-state voltage (VDS,OFF) in p-GaN gate high electron mobility transistors under varying stress time (tstress). A modified dynamic RDS,ON evaluation platform is proposed, enabling a multi-group double pulse tests method. Experimental results show a monotonic increase in RDS,ON with VDS,OFF when tstress is within the millisecond range. As tstress increases, the variations begin to display non-monotonic trends of rising initially and then falling. This discovery for the first time […]
- by Kodchakorn Simalaotao, Ivan Kurniawan, Yoshio Miura and Yuya SakurabaCurrent-perpendicular-to-plane giant magnetoresistance (CPP-GMR) devices are promising candidates for next-generation hard disk drive read heads due to their low resistance-area product and high-speed operation. This study investigates Cu-based binary alloys (Cu-X) as alternative spacers to conventional Ag spacer in Co2FeGa0.5Ge0.5 (CFGG)-based CPP-GMR devices using first-principles calculations. Majority-spin ballistic conductance, which is essential in the large spin-asymmetry of the interface resistance, was evaluated for CFGG/Cu-X/CFGG(001) trilayers in comparison with CFGG/Ag/CFGG(001) trilayer. The results show that several spacer materials have possibilities to […]
- by Xiao Lou, Jian Yang, Juan Zhu, Yong Chen, Fengsong Ye, Youzhe Zhu, Aijv Wu, Lianggui Li, Sujie Xu, Jiaying Ma and Chenbin WuAccurate esophageal segmentation in both computed tomography (CT) and magnetic resonance (MR) images remains a critical yet unresolved challenge in radiotherapy planning for esophageal carcinoma, primarily due to the organ’s complex tubular morphology, low soft-tissue contrast and prominent inter-modal variability. Manual delineation is not only time-consuming and labor-intensive but also prone to inter-observer variability, which can compromise the accuracy of dose delivery and increase the risk of radiation-induced toxicity to adjacent organs at risk. To address these limitations, this study […]
- by Yi Zhang, Shaojie Gu, Yasuhiro Kimura, Yang Ju and Yuhki TokuThis study investigates the effects of high-frequency alternating current (AC) treatment on the microstructural evolution and electrical properties of electron-beam-deposited Cu thin films. After 60 min of AC treatment at a frequency of 500 kHz, the resistivity of the Cu thin films decreased to 97.9%, 95.6%, and 94.1% of their initial values at current densities of 30, 40, and 50 kA mm−2, respectively. COMSOL simulations confirmed that the maximum temperature rise did not exceed 50 °C, demonstrating that the process […]
- by Fan Wang, Lifu Liu, Jingjuan Wang, Ziwei Yue, Zhenhua Li, Yinan Jiao and Lingzhi TangThe rapid expansion of data-intensive applications in the AI era necessitates innovative memory technologies that offer high-density storage and in-memory processing. In this study, we introduce graphene oxide quantum dots (GQDs) doped amorphous TiO2 (a-TiO2) as a dielectric layer in resistive random access memory (RRAM). This approach significantly enhances resistive and magnetic switching performance while enabling more stable four-state storage. The fabricated Ag/GQDs:a-TiO2/ITO device exhibits comparable endurance cycles (500 cycles) and retention time (12 000 s) to the undoped counterpart […]
- by Elisabetta NocerinoThe complexity of condensed matter arises from emergent behaviors that cannot be understood by investigating individual constituents in isolation. While traditional condensed-matter approaches, developed primarily for ideal crystalline solids, have provided important insights into symmetry, order, and electronic structure, they fall short in describing the rich, multiscale organization of hierarchical and soft materials. These systems exhibit structural correlations across multiple length and time scales, often governed by nonlinear interactions that span from molecular to macroscopic domains. This review explores how […]
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