Article
Engineering, Electrical & Electronic
Huaqiang Gao, Fengchun Zhang, Mengting Li, Gert Frolund Pedersen, Wei Fan
Summary: To ensure the performance of millimeter-wave radio systems, the radiation patterns of phased-array antennas need to be measured. Traditional measurement methods are time-consuming and costly, but this article proposes a novel near-field multibeam measurement system that offers various advantages such as short measurement time, automation, and low system cost.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Optics
Mingxiang Stephen Li, Rajour Tanyi Ako, Sharath Sriram, Christophe Fumeaux, Withawat Withayachumnankul
Summary: Uniform illumination is crucial for tera-hertz imaging, and converting a Gaussian beam to a flat top beam is necessary. This study presents a single metasurface lens that efficiently converts a quasi-Gaussian beam to a flat top beam in the near-field region. The design process is divided into three sections to minimize simulation time, and experimental validation confirms high-efficiency conversion at 275 GHz.
Article
Physics, Applied
Piyush Kumar, Azad Naeemi
Summary: This study presents a comprehensive benchmarking for STT and SOT based random-access memories, highlighting various tradeoffs among the write error rate, write time, and write current. In considering both in-plane and perpendicular devices, different write mechanisms such as field-assisted, STT-assisted, and switching due to out-of-plane spin torque facilitate a deeper understanding of the devices' performance.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
A. A. Tereshchenko, A. S. Ovchinnikov, D. I. Gorbunov, D. S. Neznakhin
Summary: This study discusses the possibility of experimentally observing ultrasonic attenuation in the ferromagnet LuCo3 near the low-spin-high-spin crossover. The researchers show that ultrasound propagation in the material leads to transitions between magnon band states through the absorption of phonons, and this process is highly sensitive to the magnetization value. The presence of a high magnetic field alters the ultrasound propagation regime from off-resonant to resonant, and the researchers propose a criterion for this change. Calculations demonstrate anomalies in the temperature and field dependence of ultrasonic wave number and attenuation near the crossover point at intermediate temperatures far below the Curie temperature.
Article
Nanoscience & Nanotechnology
Petr Dvorak, Pavel Klok, Michal Kvapil, Martin Hrton, Petr Bouchal, Jan Krpensky, Vlastimil Krapek, Tomas Sikola
Summary: In this study, we demonstrate the formation of the near field with non-trivial phase distribution using surface plasmon interference devices and perform experimental quantitative imaging of that phase with near-field phase microscopy. The phase distribution can be controlled by the polarization of the external illumination and the area of the device assigned to the object wave. Comparison with numerical and analytical models confirms the origin of the near-field phase and verifies the predictive power of the models. Additionally, we show that it is possible to generate near-field plane waves with different propagation directions on a single device.
Article
Nanoscience & Nanotechnology
Weikang Pan, Zhuo Wang, Yizhen Chen, Shiqing Li, Xiaoying Zheng, Xinzhang Tian, Cong Chen, Nianxi Xu, Qiong He, Lei Zhou, Shulin Sun
Summary: A new strategy is proposed to efficiently generate arbitrary spin-polarized scattering far-field patterns from surface-wave (SW) excitations on a designer Pancharatnam-Berry (PB) metasurface. PB meta-atoms serve as subwavelength scatter to decouple impinging SW to spin-polarized propagating waves (PW), and interference among PWs generated by scatterings at different PB meta-atoms can generate tailored far-field patterns. Designed PB metasurfaces in the microwave regime can generate desired radiation patterns within a broad frequency band, including unidirectional radiation, line/point focusing, vortex beam, and hologram.
Review
Engineering, Electrical & Electronic
Peng Shi, Aiping Yang, Fanfei Meng, Jiashuo Chen, Yuquan Zhang, Zhenwei Xie, Luping Du, Xiaocong Yuan
Summary: This article reviews near-field techniques for measuring optical SOIs and their potential applications. It summarizes the importance of optical SOIs and their role in various light-matter interactions, followed by an overview of the theoretical basis and latest achievements of near-field measurement techniques, including NSOM, optical manipulations, nanoantennas, and specially designed nanoprobes. A comprehensive classification of all known methods for optical near-field measurements of light's SOI is presented, along with novel techniques identified for future applications.
PROGRESS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Fernando Rodriguez Varela, Javier Fernandez Alvarez, Belen Galocha Iraguen, Manuel Sierra Castaner, Olav Breinbjerg
Summary: This article presents a thorough study on phaseless near-field measurements with spherical probe correction using the two-scans technique. Through numerical simulations, the influence of different measurement parameters on the phaseless technique is analyzed, showing how the measurement spheres significantly affect the convergence of the phase retrieval algorithm. A set of guidelines to improve the accuracy of phaseless spherical near-field algorithms is extracted.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Multidisciplinary Sciences
Amjad Iqbal, Penchala Reddy Sura, Muath Al-Hasan, Ismail Ben Mabrouk, Tayeb A. Denidni
Summary: A dual-band implantable rectenna is proposed for recharging and operating biomedical implantable devices. It consists of a compact dual-band antenna and an efficient rectifier circuit, which are integrated inside a capsule device. The rectenna demonstrates enhanced capability to harvest ambient energy from multiple directions and achieves high conversion efficiency for two frequency bands.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Ruizhi Liu, Ke Wu
Summary: Electromagnetic waves are widely used in modern communication systems, but traditional electromagnetic circuits may encounter issues in large-scale systems. Therefore, a new method based on wave or field interference is proposed to achieve interaction among devices. This method can spatially accomplish signal processing and has universal applicability to various physical wave devices and systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Alvaro F. Vaquero, Rafael Florencio, Marcos R. Pino, Manuel Arrebola
Summary: This work presents a reflectarray antenna as a dual-polarized plane wave generator in mm-wave frequencies. The designed reflectarray shows the capability to produce a uniform plane wave within its near field. The research demonstrates that reflectarray antennas are a suitable and low-profile solution to produce uniform plane waves within the near field.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Physics, Multidisciplinary
L. C. Garcia de Andrade
Summary: This study focuses on spin-1 and spin-0 torsion wave modes in linearized teleparallelism, revealing scalar torsion waves and gravitational waves generated by contortion tensors. A thought experiment involving a gravitational-torsion wave hitting a ring of spinless particles is proposed, showing agreement with strain estimates from a real-world LIGO experiment. The model also investigates the physical implications of contortion through analysis of GW energy pseudo-tensors and axial torsion vectors.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Review
Chemistry, Multidisciplinary
Junseok Ma, Jinyoung Choi, Sungeun Park, Imbo Kong, Daehyeon Kim, Cheonga Lee, Youngno Youn, Myeonggin Hwang, Seungwon Oh, Wonbin Hong, Wooksung Kim
Summary: Liquid crystal (LCs) technology has been widely used in the display industry and is now gaining interest in high-frequency microwave and millimeter-wave applications. This article summarizes the design strategies of LCs for advanced smart RF devices and discusses the challenges in their development.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Resti Montoya Moreno, Joni Kurvinen, Juha Ala-Laurinaho, Alexander Khripkov, Janne Ilvonen, Jari van Wonterghem, Ville Viikari
Summary: This article presents a dual-polarized endfire antenna array for millimeter-wave frequencies, which is fed using a transmission line and shows excellent performance in a mobile phone. The antenna allows for colocating sub-6 GHz and mm-wave antennas in the same metal frame, with a realized gain of 8 to 12.6 dBi and total efficiency better than -2 and -3 dB for horizontal and vertical polarizations across the entire band.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Materials Science, Multidisciplinary
Damian Tomaszewski, Piotr Busz, Jan Martinek
Summary: This paper provides a detailed theoretical description of the influence of spin accumulation in metallic Fermi leads on the Kondo effect in systems such as quantum dots and Kondo alloys. The study shows that the presence of spin accumulation, magnetic field, and ferromagnetic leads spin polarization can suppress the Kondo effect, but for appropriately selected parameter values, these effects can compensate each other and may lead to the restoration of the Kondo effect in the analyzed systems. The paper also discusses recent experiments related to spin current in Kondo alloys.
Article
Materials Science, Ceramics
Hur Abbas, K. Nadeem, S. Munir, U. Ahmed, M. Usman, Mikhail Kostylev
Summary: The study investigated the single and co-doping effects of Fe and Co on the structural and magnetic properties of NiO nanoparticles. It was found that Fe and Co doping induced different magnetic behaviors in the NiO system, with core magnetization being a main effect of Co-Fe co-doping.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Applied
Andrey A. Nikitin, Aleksei A. Nikitin, Alexey B. Ustinov, S. Watt, M. P. Kostylev
Summary: A theoretical model has been developed to study the nonlinear spin-wave transient processes in magnonic active-ring oscillators (MAROs) with variable gain. The model shows good agreement with experimental data and can be used for maximizing the performance of reservoir computers.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Thomas A. Schefer, David L. Cortie, Mikhail Kostylev
Summary: By using ferromagnetic resonance (FMR) spectroscopy, we have found that the FMR peak in Pd/[Co/Pd](30)/Pd multilayer thin films shifts in the presence of hydrogen gas, with a larger shift observed for samples with thicker Pd layers. We have also observed a correlation between the linewidth and the Pd layer thickness, which can be explained by the presence of spin pumping.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Hur Abbas, K. Nadeem, J. Hester, M. F. Pervez, S. Yick, M. Kostylev, Ilse Letofsky-Papst, B. Ali, C. Ulrich, H. Krenn
Summary: This study reports the competing magnetic states between superparamagnetic blocking and Neel transition states in 14 nm core-shell NiO nanoparticles. An interesting M-H loop splitting attributed to slow spin relaxation was observed at a crossover temperature, which is particle size dependent and suppressed for diameters above and below 14 nm.
Article
Physics, Applied
Thomas A. Schefer, Ryszard Narkowicz, Kilian Lenz, Fabian Ganss, Malcolm P. Roberts, Olav Hellwig, Mariusz Martyniuk, Juergen Lindner, Mikhail Kostylev
Summary: This research investigates the ferromagnetic resonance (FMR) response of microfabricated microwave resonators loaded with small Co16Pd84 alloy rectangles. The use of the microwave-resonator structure significantly enhances the FMR signal-to-noise ratio. The study reveals a similar FMR peak shift to that of Co16Pd84 continuous films in the presence of hydrogen gas. The high sensitivity of the FMR signal of the Co16Pd84 alloy rectangle to hydrogen exposure allows for the measurement of relatively small hydrogen-concentration steps near 100% H-2.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Aaron Quiskamp, Ben T. McAllister, Paul Altin, Eugene N. Ivanov, Maxim Goryachev, Michael E. Tobar
Summary: The SMASH model predicts the existence of axion dark matter particles within the mass range of 50 to 200 micro-electron volts. The ORGAN experiment in Australia conducted a scan within the mass range of 63.2 to 67.1 micro-electron volts using a microwave cavity axion haloscope, and obtained a highly sensitive result that sets an upper limit on the coupling of axions to two photons, excluding the well-motivated axion-like particle cogenesis model for dark matter.
Article
Materials Science, Multidisciplinary
Charles Weiss, Matthieu Bailleul, Mikhail Kostylev
Summary: A fully self-consistent model for the excitation and reception of magnetostatic surface waves in thin ferromagnetic films by a set of coplanar antennas was developed and implemented numerically. The model calculates the coupling impedances between the different strips constituting the coplanar antennas. In some situations, this leads to a frequency non-reciprocity between counter-propagating waves even in the case of no asymmetry in the spin-wave dispersion relation. The final output of the model, given as the scattering parameters, S11, S12, and S21 of the antenna system, were in good agreement with previous experimental studies.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Multidisciplinary
Vitalii V. Vitko, Andrey A. Nikitin, Roman Haponchyk, Andrey A. Stashkevich, Mikhail P. Kostylev, Alexey B. Ustinov
Summary: This study investigated the nonlinear frequency responses of a magnonic active ring resonator in a wide range of bias magnetic fields, revealing the appearance of bistability in the resonator behavior. Bistability was characterized by a stable hysteretic response of the output power transitioning between two values at the same operating frequency.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Multidisciplinary Sciences
Michael E. Tobar, Catriona A. Thomson, William M. Campbell, Aaron Quiskamp, Jeremy F. Bourhill, Benjamin T. McAllister, Eugene N. Ivanov, Maxim Goryachev
Summary: This paper introduces a systematic method to calculate the spectral sensitivity of an axion haloscope, allowing comparisons to standard gravitational wave detectors based on optical interferometers and resonant-mass technology.
Article
Chemistry, Multidisciplinary
Rostyslav O. Serha, Dmytro A. Bozhko, Milan Agrawal, Roman V. Verba, Mikhail Kostylev, Vitaliy Vasyuchka, Burkard Hillebrands, Alexander A. Serga
Summary: This study reports a method to improve spin wave transmission in YIG/Pt bilayers by changing the excitation configuration, which reduces attenuation caused by eddy currents in the Pt layer, making it suitable for spintronic devices.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Alexandr Kondrashov, Aleksei A. Nikitin, Andrey A. Nikitin, Mikhail Kostylev, Alexey B. Ustinov
Summary: We conducted numerical simulation on the performance of a physical reservoir computer using a magnonic active ring oscillator. The evaluation of performance was done based on short-term memory and parity-check capacities. The results demonstrate the potential for improving the performance characteristics of the reservoir computer.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
A. A. Grachev, S. E. Sheshukova, M. P. Kostylev, S. A. Nikitov, A. V. Sadovnikov
Summary: We report on the coupling of spin waves propagating as guided modes of yttrium iron garnet stripes. The coupling is due to the long-range dynamic magnetic field of the precessing magnetization vector. We propose controlling the coupling characteristics through variation of the static magnetization angle.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Stuart Watt, Mikhail Kostylev
Summary: The effectiveness of a physical reservoir computer model based on traveling spin waves in a spin-wave delay-line active-ring resonator has recently been demonstrated. This study explores the adaptation of this neuromorphic device for sensing applications. By taking advantage of the strong coupling between the physical reservoir and its environment, the reservoir is used as a sensing element in the reservoir computing for sensing framework. The dynamics of traveling spin waves in the delay-line active rings depend heavily on the magnetic field and carrier frequency of these spin waves.
PHYSICAL REVIEW APPLIED
(2023)
Article
Astronomy & Astrophysics
Catriona A. Thomson, Maxim Goryachev, Ben T. McAllister, Eugene N. Ivanov, Paul Altin, Michael E. Tobar
Summary: We present new results of a room temperature resonant AC haloscope, which searches for axions via photon upconversion. The experiment replaces the traditional DC magnetic background field with a second microwave background resonance within the detector cavity, and is sensitive to a newly proposed quantum electromagnetodynamical axion coupling term. Two experimental approaches are outlined, and the results of the power detection experiment show an improvement of 3 orders of magnitude over previous results.
Article
Engineering, Electrical & Electronic
Eugene N. Ivanov, Michael E. Tobar
Summary: We studied the response of cryogenic sapphire resonator to fast variations in microwave power. Power-to-frequency conversion of the resonator depends on Fourier frequency and acts as a first-order low-pass filter with corner frequency close to the resonator's loaded half-bandwidth. By measuring the power-to-frequency conversion, we can predict the phase noise of a microwave oscillator based on such a resonator.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
