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Spin Magnetoresistance of Thin-Film Structures Made of Manganite and Material with Strong Spin-Orbital Interaction 锰矿和强自旋轨道相互作用材料薄膜结构的自旋磁阻
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100194
G. D. Ulev, K. Y. Constantinian, I. E. Moskal’, G. A. Ovsyannikov, A. V. Shadrin
{"title":"Spin Magnetoresistance of Thin-Film Structures Made of Manganite and Material with Strong Spin-Orbital Interaction","authors":"G. D. Ulev, K. Y. Constantinian, I. E. Moskal’, G. A. Ovsyannikov, A. V. Shadrin","doi":"10.1134/s1064226923100194","DOIUrl":"https://doi.org/10.1134/s1064226923100194","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract—</h3><p>The paper presents the results of experimental determination of the spin Hall angle in a Pt/La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> bilayer metal/ferromagnetic structure inferred from angular dependences of longitudinal and transverse spin magnetoresistance in configuration of the planar Hall effect. The value of the spin Hall angle determined from the longitudinal magnetoresistance is θ<sub><i>Hx</i></sub> ≈ 0.016, and that from the transverse magnetoresistance is θ<sub><i>Hy</i></sub> ≈ 0.018, whereas for SrIrO<sub>3</sub>/La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> heterostructures the ratio of values of the transverse spin Hall angle to the longitudinal one appears to be substantially higher, θ<sub><i>Hy</i></sub>/θ<sub><i>Hx</i></sub> ≈ 9, which is apparently caused by a layer with a high spin conductance formed at the SrIrO<sub>3</sub>/La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> interface.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"17 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of Radiation Absorption of Acoustic Lamb Waves in Plates Loaded with Inviscid Nonconducting Liquid 加载粘性非导电液体的平板对声学λ波的辐射吸收分析
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100029
N. A. Ageikin, V. I. Anisimkin, N. V. Voronova, A. V. Smirnov
{"title":"Analysis of Radiation Absorption of Acoustic Lamb Waves in Plates Loaded with Inviscid Nonconducting Liquid","authors":"N. A. Ageikin, V. I. Anisimkin, N. V. Voronova, A. V. Smirnov","doi":"10.1134/s1064226923100029","DOIUrl":"https://doi.org/10.1134/s1064226923100029","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The dependence of radiation losses in a liquid on the value of displacement component <i>U</i><sub>3</sub> normal to the plate on the surface of a piezoelectric plate for Lamb waves of various orders has been experimentally investigated. The waves whose phase velocity <i>V</i><sub><i>n</i></sub> in the plate is greater than velocity <i>V</i><sub>l</sub> of the longitudinal volumetric acoustic wave in the liquid are considered. It is shown that at low values of <i>U</i><sub>3</sub>, there is no radiation into the liquid and the value of radiation losses is close to zero even at <i>V</i><sub><i>n</i></sub> &gt; <i>V</i><sub>l</sub>, at high values of <i>U</i><sub>3</sub>, the value of radiation losses is large and for Lamb waves in the YZ–LiNbO<sub>3</sub> plate with a normalized wavelength thickness of 1.75 and a frequency of 16.97 MHz, it reaches a value of 4 dB/mm, comparable to the radiation losses of surface acoustic waves in the same material.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"39 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Textural-Fractal Analysis of Polarimetric Images Generated by Synthetic Aperture Radar 合成孔径雷达生成的极坐标图像的纹理-分形分析
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100145
A. A. Potapov, V. A. Kuznetsov
{"title":"Textural-Fractal Analysis of Polarimetric Images Generated by Synthetic Aperture Radar","authors":"A. A. Potapov, V. A. Kuznetsov","doi":"10.1134/s1064226923100145","DOIUrl":"https://doi.org/10.1134/s1064226923100145","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract—</h3><p>All currently known methods and ways for the formation of the fractal features of polarimetric radar images have been given. A new textural-fractal feature has been briefly considered: a directional multifractal signature measured morphologically by an iterative coverage method. In relation to the analysis of polarimetric images generated by a synthetic aperture radar, a new concept of their processing based on the possibility of considering the polarization differences of terrestrial spatially distributed objects by identifying the multifractal and anisotropic properties of their texture has been proposed. The variant of interpretation of the results for automation of further successful solution of specific problems of segmentation (classification) of the underlying surface and detection and recognition of ground objects has been shown.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"32 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unambiguous Compression Acquisition for BOC-Signal at Low Sampling Rate 低采样率下对 BOC 信号的清晰压缩采集
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100212
H. Li, T. F. Liu, H. Y. Sun, S. L. Lian, K. A. Budunova, V. F. Kravchenko, Z. S. Sun, Y. Zheng
{"title":"Unambiguous Compression Acquisition for BOC-Signal at Low Sampling Rate","authors":"H. Li, T. F. Liu, H. Y. Sun, S. L. Lian, K. A. Budunova, V. F. Kravchenko, Z. S. Sun, Y. Zheng","doi":"10.1134/s1064226923100212","DOIUrl":"https://doi.org/10.1134/s1064226923100212","url":null,"abstract":"<p><b>Abstract</b>—In the modernization of Global Navigation Satellite System (GNSS), Binary offset carrier (BOC) modulation signal has been applied as a new modulation method, but it also brings the complexity of signal acquisition process. To reduce the data required for BOC signal acquisition and eliminate acquisition ambiguity, an unambiguous compression acquisition method is proposed. The core ideas are as follows: (1) Based on the principle of disambiguation by side-peak superposition, a matrix operation model is constructed for signal sparse transformation; (2) Extract the basic elements of compressed sensing (CS) theory, select a measurement matrix based on singular value decomposition (SVD) for compression measurement, and use the Orthogonal Matching Pursuit (OMP) algorithm for signal reconstruction. The simulation results show that the method can completely remove the side-peaks of the acquisition curve. The acquisition performance is more than 3 dB better than the compressed sensing acquisition method based on singular value decomposition (SVD-CS). The sampling rate is more than 57% lower than that of the BOC signal acquisition based on side-peak superposition (BASS), overcoming the limitation of Nyquist sampling theorem. Finally, it can be explained that the proposed method can realize the unambiguous acquisition of BOC signal under low sampling rate.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"266 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structure of Aluminum Films for the Creation of Tunnel Junctions 用于创建隧道结的铝膜结构
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100157
M. V. Strelkov, A. M. Chekushkin, A. A. Lomov, S. V. Kraevskii, M. Yu. Fominskii, M. A. Tarasov
{"title":"Structure of Aluminum Films for the Creation of Tunnel Junctions","authors":"M. V. Strelkov, A. M. Chekushkin, A. A. Lomov, S. V. Kraevskii, M. Yu. Fominskii, M. A. Tarasov","doi":"10.1134/s1064226923100157","DOIUrl":"https://doi.org/10.1134/s1064226923100157","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A series of studies of the structure of aluminum films deposited on single-crystal silicon substrates in different temperature regimes has been carried out. The roughness and grain size of 20-nm thick films of nuclei deposited at elevated temperatures and also dusted over the nucleus layer at room temperature to a thickness of 150 nm was studied using an atomic force microscope. The film profile was measured in an electron microscope. It is found that films on a hot sublayer turn out to be smoother, more rigid (less friable), and make it possible to expect the creation of superconductor–insulator–superconductor and superconductor–insulator–normal metal transitions with a higher current density and lower capacitance, respectively.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"21 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Construction of Wavelets Based on Exponential Atomic Functions hupa(x) and Harmonic Functions scupb(x) and gk(x) 构建基于指数原子函数 hupa(x) 和谐函数 scupb(x) 及 gk(x) 的小波
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s106422692310008x
V. F. Kravchenko, Ya. Yu. Konovalov
{"title":"Construction of Wavelets Based on Exponential Atomic Functions hupa(x) and Harmonic Functions scupb(x) and gk(x)","authors":"V. F. Kravchenko, Ya. Yu. Konovalov","doi":"10.1134/s106422692310008x","DOIUrl":"https://doi.org/10.1134/s106422692310008x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibility of constructing wavelets based on convolutions with a rectangular impulse of exponential and harmonic atomic functions has been studied. Some properties of exponential and harmonic atomic functions are considered. The values of the uncertainty constants of the constructed wavelets are calculated.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development and Investigation of a Slow-Wave Structure for a Miniature Multiple-Beam W-Band Traveling Wave Tube 微型多波束 W 波段行波管慢波结构的开发与研究
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100182
R. A. Torgashov, D. A. Nozhkin, A. V. Starodubov, N. M. Ryskin
{"title":"Development and Investigation of a Slow-Wave Structure for a Miniature Multiple-Beam W-Band Traveling Wave Tube","authors":"R. A. Torgashov, D. A. Nozhkin, A. V. Starodubov, N. M. Ryskin","doi":"10.1134/s1064226923100182","DOIUrl":"https://doi.org/10.1134/s1064226923100182","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The results of the development of a meander-line slow-wave system (SWS) with metal supports for a miniature high-power W-band traveling-wave tube (TWT) with two sheet electron beams are presented. Using a three-dimensional finite element software package, the electromagnetic parameters of the SWS were studied. A two-section model of a TWT amplifier with a sever to prevent self-excitation has been developed. Three-dimensional modeling of the beam–wave interaction has been carried out. It was found that with a total beam current of 200 mA in the linear mode, the gain exceeds 30 dB in the frequency band 95.4–97.75 GHz, and the output power in the saturation mode reaches 120 W. A technology for manufacturing SWSs based on laser micromachining of thin copper plates is proposed. Test samples of the SWS were fabricated and verified using optical and scanning electron microscopy.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Magnetic Properties of Metal Dichalcogenide in the Frame of Heisenberg-Like Model: DFT and Monte-Carlo Methods 类海森堡模型框架下的金属二钙化物磁性：DFT 和蒙特卡洛方法
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100054
A. I. Kartsev, K. V. Obraztsov, P. V. Lega
{"title":"Magnetic Properties of Metal Dichalcogenide in the Frame of Heisenberg-Like Model: DFT and Monte-Carlo Methods","authors":"A. I. Kartsev, K. V. Obraztsov, P. V. Lega","doi":"10.1134/s1064226923100054","DOIUrl":"https://doi.org/10.1134/s1064226923100054","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>We study magnetism in the 2D magnets with a <span>(d)</span>-metal sub-lattice based on the density functional theory and Monte-Carlo simulations. The phenomena of ligand field and the macroscopic nature of <span>(p{text{-}}d)</span> orbitals hybridization has been discussed widely. For a magnetism in the 2D materials with a honeycomb and hexagonal <span>(d)</span>-metal sub-latices we derive an effective Hamiltonian for a spin subsystem with and without inclusion next nearest-neighbors interaction and higher-order terms. Based on the proposed models critical temperature <span>({{T}_{{text{C}}}})</span> for a wide range of compounds estimated.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"19 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of the Crystallographic Orientation on the Phase Transition in a Finite TiNi Shape Memory Alloy Plate 晶体取向对有限钛镍形状记忆合金板相变的影响
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100133
A. I. Pavlov, A. I. Kartsev, V. V. Koledov, P. V. Lega
{"title":"Effect of the Crystallographic Orientation on the Phase Transition in a Finite TiNi Shape Memory Alloy Plate","authors":"A. I. Pavlov, A. I. Kartsev, V. V. Koledov, P. V. Lega","doi":"10.1134/s1064226923100133","DOIUrl":"https://doi.org/10.1134/s1064226923100133","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A TiNi shape memory alloy plate has been simulated at different crystallographic orientations in the free LAMMPS classical molecular dynamics simulator. It has been found that the crystallographic orientation of the plate significantly affects the phase transition temperature. The temperature dependence of the surface energy at the (100), (110), (112), and (122) crystallographic orientations has been built. The stability of the model used has been examined and thereby its applicability to the calculation made has been confirmed.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"84 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design of Superconducting Integrated Matching Circuits 设计超导集成匹配电路
IF 0.5 4区 计算机科学
Journal of Communications Technology and Electronics Pub Date : 2023-12-13 DOI: 10.1134/s1064226923100066
F. V. Khan, A. A. Atepalikhin, L. V. Filippenko, V. P. Koshelets
{"title":"Design of Superconducting Integrated Matching Circuits","authors":"F. V. Khan, A. A. Atepalikhin, L. V. Filippenko, V. P. Koshelets","doi":"10.1134/s1064226923100066","DOIUrl":"https://doi.org/10.1134/s1064226923100066","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this paper, we developed and investigated superconducting integrated circuits designed to match the impedances of a generator represented by a flux-flow oscillator based on a long Josephson junction and a detector based on a superconductor–insulator–superconductor tunnel junction in the subterahertz frequency range. The structures were modeled using the transfer matrix method. Designs were also calculated in the program of numerical three-dimensional modeling. A qualitative agreement was found between the results obtained by two methods. Three samples with different topologies were designed, covering the frequency range of 250–680 GHz at a level of –2 dB.</p>","PeriodicalId":50229,"journal":{"name":"Journal of Communications Technology and Electronics","volume":"32 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138628501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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