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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Karavayskiy A. Yu., Lukin Y. I.
Заглавие : The effect of clay content on the spectra of permetivity of mineral soils at positive temperatures
Колич.характеристики :4 с
Коллективы : Radiation and Scattering of Electromagnetic Waves 2023
Место публикации : Conf. Proc. - Radiat. Scatt. Electromagn. Waves, RSEMW. - 2023. - P.456-459. - , DOI 10.1109/RSEMW58451.2023.10201998
Примечания : Cited References: 17. - The work was financially supported by the Russian Science Foundation and the Krasnoyarsk Regional Fund for Support of Scientific and Scientific and Technical Activities within the framework of the scientific project No. 22-27-20112
Аннотация: In this research, it was studied the crossover frequencies of the spectra of the real part of the permittivity of moist mineral soils with different clay content from 10 to 64% in the frequency range from 15 MHz to 15 GHz and in the temperature range from 25 to 0 °C. Based on the experimental dependences obtained, empirical models were proposed for the average crossover frequency of the soil of the real part of the permittivity spectra in the range of changes of these frequencies values with temperature changes, as well as for the half-widths of the ranges of changes.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuznetsov S. A., Lapanik V. I., Lugouskiy A. A., Timofeev S. N., Sutormin V. S., Zyryanov V. Ya.
Заглавие : Electrically-tunable reflectarrays for millimeter waves based on liquid-crystal-loaded high-impedance surfaces
Коллективы : "Terahertz and microwave radiation: generation, detection and applications", International conference, «Терагерцевое и микроволновое излучение: генерация, детектирование и приложения», конференции с международным участием, Национальный исследовательский ядерный университет МИФИ, Московский государственный университет им. М.В. Ломоносова, Национальный исследовательский центр "Курчатовский институт"
Место публикации : The 5-th International conference "Terahertz and microwave radiation: generation, detection and applications" (TERA-2023): abstract book. - Москва, 2023. - P.11
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Sitnikov, Maxim, Romanova O. B., Kharkov, Anton, Begisheva, Olga, Zelenov, Fyodor
Заглавие : Electrosound and asymmetry of the I-V characteristic induced by ultrasound in the RexMn1-xS (Re = Tm, Yb)
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Belarussian Republic Foundation for Basic Research [20-52-00005]
Место публикации : Eur. Phys. J. Plus. - 2022. - Vol. 137, Is. 2. - Ст.226. - ISSN 2190-5444, DOI 10.1140/epjp/s13360-022-02432-0
Примечания : Cited References: 46. - This study was supported by the Russian Foundation for Basic Research and the Belarussian Republic Foundation for Basic Research (Project No. 20-52-00005). The investigation ofmicrostructural properties of the sampleswas carried out using equipment's (SEM and TEM) the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center " Krasnoyarsk Science Center SB RAS". The authors are grateful to A.V. Shabanov, senior researcher of the Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, for the scanning electron microscopy investigations
Предметные рубрики: ACOUSTIC CHARGE-TRANSPORT
WAVES
SEMICONDUCTOR
ATTENUATION
Аннотация: A correlation between the temperatures corresponding to the maxima of the sound attenuation and temperature resistance coefficient in the RexMn1-xS solid solutions related to the condensation of electrons and holes has been established. X-ray diffraction, energy-dispersive X-ray spectrum, and scanning electron microscope techniques have been used to investigate the microstructure of the samples. In the Yb0.2Mn0.8S compound, a decrease in the ultrasound attenuation with increasing temperature has been observed. The functional dependences of the electrosound on the ultrasound intensity and carrier type and the change in the electrosound sign with temperature have been established. The asymmetry of the I-V characteristic depending on the ultrasound intensity and the attenuation coefficient depending on the electric field has been found. The nonlinear attenuation of the ultrasound as a function of the intensity has been observed. Model of elastic and inelastic scattering of current carriers by acoustic phonons, deformation interaction is used to explain the asymmetry.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Лемберг, Константин Вячеславович, Шабанов, Дмитрий Александрович, Грушевский, Евгений Олегович, Подшивалов, Иван Валерьевич
Заглавие : Методика синтеза одномерно сканирующих антенн на основе модулированных метаповерхностей
Место публикации : Журн. СФУ. Техн. и технол. - 2022. - Т. 15, № 6. - С. 750-758. - ISSN 1999494X (ISSN), DOI 10.17516/1999-494X-0433; J. Sib. Fed. Univ. Eng. Technol. - ISSN 23136057 (eISSN)
Примечания : Библиогр.: 12. - Исследование выполнено при финансовой поддержке РФФИ, Правительства Красноярского края и Красноярского краевого фонда науки в рамках научного проекта 20–47–243002
Аннотация: В работе описана методика синтеза сканирующих в одной плоскости апертурных антенн вытекающей волны, построенных на основе метаповерхностей с модулированным поверхностным импедансом. Такие антенны состоят из цепочки субволновых резонансных элементарных ячеек, имеющих две степени свободы, одна из которых используется для модуляции импеданса метаповерхности, а вторая для динамического изменения направления излучения вытекающей волны. В качестве примера применения методики была синтезирована антенна на основе металлической гофрированной структуры, позволяющая проводить сканирование в диапазоне углов от 4° до 42° на частоте 27 ГГц и имеющая КНД от 26.4 до 30.1 дБи. Антенны представленного типа позволяют реализовывать одномерное электронное сканирование существенно более простым способом, чем фазированные антенные решетки,This paper describes a method for the synthesis of one-dimensional scanning leaky-wave antennas based on metasurfaces with modulated surface impedance. Such antennas consist of a chain of subwavelength resonant elementary cells with two degrees of freedom, one of which is used to modulate the impedance of the metasurface and the other to dynamically change the radiation direction of the leaky wave. As an example of the proposed method application antenna based on a metallic corrugated structure was synthesized, which allows scanning in the range from 4° to 42° at 27 GHz and has a directivity from 26.4 to 30.1 dBi. Antennas of the described type allow to realize one-dimensional electronic scanning in a much simpler way than phased array antennas.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Solovev P. N., Afonin A. O., Belyaev B. A., Boev N. M., Govorun I. V., Izotov A. V., Ugrymov A. V., Leksikov An. A.
Заглавие : Second harmonic generation as a probe of parametric spin wave instability processes in thin magnetic films
Место публикации : Phys. Rev. B. - 2022. - Vol. 106, Is. 6. - Ст.064406. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.106.064406
Примечания : Cited References: 33. - This work was supported by the Russian Science Foundation under Grant No. 19-72-10047. The equipment of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” was used during the measurements
Аннотация: We have explored the dynamic response of in-plane magnetized thin permalloy films excited by microwave fields of high amplitudes (up to 3 Oe) at 1 GHz. The response was detected using a microstrip line by measuring the second harmonic signal generated by the dynamic components of the uniform magnetization. The data measured at ferromagnetic resonance showed the threshold effect of the Suhl parametric instability process. With the increase of the microwave power above the threshold value, the dynamic response revealed an intricate nonlinear behavior, including the emergence of an additional threshold. This second threshold can be explained in terms of the "stage by stage"process of parametric spin wave excitation following the S theory of Zakharov, L'vov, and Starobinets.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. S., Isaev I. L., Ershov A. E., Gerasimov V. S., Polyutov S. P., Karpov S. V.
Заглавие : Part II. Nanobubbles around plasmonic nanoparticles in terms of modern simulation modeling: what makes them kill the malignant cells?
Коллективы : Ministry of Science and High Education of Russian Federation [FSRZ-2020-0008]; RFBRRussian Foundation for Basic Research (RFBR); Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-240003]
Место публикации : J. Phys. D. - 2022. - Vol. 55, Is. 17. - Ст.175402. - ISSN 0022-3727, DOI 10.1088/1361-6463/ac4c1f. - ISSN 1361-6463(eISSN)
Примечания : Cited References: 49. - The research was supported by the Ministry of Science and High Education of Russian Federation (Project No. FSRZ-2020-0008), and was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, Project No. 20-42-240003
Предметные рубрики: STRESS WAVES
LASER
MEMBRANE
DAMAGE
DEATH
LYSIS
Аннотация: We have established numerically the physical pattern and conditions for formation of nanosized bubbles in aqueous medium around biocompatible plasmonic nanoparticles (NPs) selectively bound to the membrane of the malignant cells by means of DNA-aptamers under the action of picosecond laser radiation. The results obtained are based on the finite volume method and hydrodynamic models underlying the ANSYS Fluent package with extended capabilities. We have found the main features and previously unknown dominant factors of the damage effect on the cell membrane at the moment of the bubble nucleation around the plasmonic NPs of different types taking into account the influence of the closely located membrane. Information on the kinetics of spatial distribution of pressure, temperature and the relative proportion of vapor in the 'nanoparticle-membrane-medium' system have been obtained. The attention is drawn to the advantages of using biocompatible, perfectly absorbing core–shell plasmonic NPs for anti-tumor therapy characterized by an increased mechanical effect on malignant cell membranes at lower laser radiation intensity and the spectral position of their plasmon resonance (λ = 700 nm) in the hemoglobin transparency range. This ensures penetration of laser radiation deep into tissues. The paper is provided with an extensive review of key publications and the state-of-art in this area.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Turchin, Pavel P., Burkov, S. I., Turchin, Vladimir, I, Pletnev, Oleg N., Chulkova, Marina Yu, Nechepuryshina, Anastasia G.
Заглавие : Anisotropy of the electromechanical characteristics of SH-waves and Lamb waves in yttrium aluminum borate single crystals
Коллективы : Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0011]
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2022. - Vol. 15, Is. 1. - P.80-87. - ISSN 1997-1397, DOI 10.17516/1997-1397-2022-15-1-80-87; Журн. СФУ. Матем. и физика. - ISSN 2313-6022(eISSN)
Примечания : Cited References: 24. - The study was carried out within the framework of the state assignment of the Ministry of Science and Higher Education of the Russian Federation (research project code FSRZ-2020-0011)
Аннотация: The anisotropy of the electromechanical properties of SH-waves and Lamb waves in yttrium aluminum borates, which are nonmagnetic representatives of the RMe3(BO3)4 single crystals family (where R=Y, La-Lu; M=Fe, Al, Cr, Ga, Sc) with unique properties of magnetoelectrics and multiferroics, has been studied. In the process of the numerical simulation of the acoustic waves characteristics, the values of linear electromechanical constants of YAl3(BO3)4 single crystals, previously measured by ultrasonic pulse echo and quasi-static methods, have been used.Исследована анизотропия электромеханичеких характеристик SH-волн и волн Лэмба в иттриевых алюмоборатах, которые являются немагнитным представителем семейства монокри- сталлов RMe3(BO3)4 (где R=Y, La-Lu; M=Fe, Al, Cr, Ga, Sc) с уникальными свойствами магнитоэлектриков и мультиферроиков. При численном моделировании характеристик акустических волн использованы значения линейных электромеханических постоянных монокристаллов YAl3(BO3)4, измеренных ранее ультразвуковым эхо-импульсным и квазистатическим методами.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Skorobogatov S. A., Shaykhutdinov K. A., Balaev D. A., Pavlovskii M. S., Krasikov A. A., Terentjev K. Yu.
Заглавие : Spin dynamics and exchange interaction in orthoferrite TbFeO3 with non-Kramers rare-earth ion
Место публикации : Phys. Rev. B. - 2022. - Vol. 106, Is. 18. - Ст.184404. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.106.184404
Примечания : Cited References: 41. - We acknowledge A. Podlesnyak for help with INS experiments and S. E. Nikitin for stimulating discussion. The reported study was funded by RFBR, Project No. 20-32-90142. This research used resources at Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory
Аннотация: The low-temperature spin dynamics of the orthorhombic TbFeO3 perovskite has been studied. It has been found that the inelastic neutron scattering (INS) spectrum of the investigated compound contains two modes corresponding to different sublattices. It is shown that the iron subsystem orders antiferromagnetically at TN=632 K and exhibits the high-energy magnon dispersion. The magnetic dynamics of this subsystem has been described within the linear spin wave theory and the in-plane and out-of-plane exchange anisotropy has been demonstrated. The approach proposed previously to describe the magnon dispersion in the TmFeO3 compound has been used. Three levels of the nondispersive crystal electric field corresponding to Tb3+ ions have been found in the energy region below 40 meV at about 17, 26, and 35 meV. The behavior of the magnetic correlation length of the terbium subsystem has been determined by studying the diffuse scattering at different temperatures. The evolution of this subsystem has been numerically described within the point charge model. It is shown that the numerical data agree satisfactorily with the experiment and with the general concept of the single-ion approximation applied to the rare-earth subsystem of orthorhombic perovskites.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Lemberg K. V., Kosmynin A. N., Aleksandrin A. M., Grushevsky E. O., Podshivalov I. V.
Заглавие : Method of anisotropic metasurface unit cell surface impedance calculation
Коллективы : Radiation and Scattering of Electromagnetic Waves
Место публикации : 2021 Radiation and Scattering of Electromagnetic Waves (28 June - 2 July 2021 ; Divnomorskoe, Russia). Conference Proceedings - 2021 Radiation and Scattering of Electromagnetic Waves, RSEMW 2021: Institute of Electrical and Electronics Engineers, 2021. - P.273-275. - , DOI 10.1109/RSEMW52378.2021.9494126
Примечания : Cited References: 8. - The research was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20-47-243002
Аннотация: High gain antennas based on metasurfaces with modulated surface impedance are a new class of antennas that have appeared in the last decade. They characterized by a simple design, but a relatively complex synthesis procedure. The paper briefly describes the modulated metasurface antennas principle of operation, and gives a specific method for calculating the anisotropic cell impedance tensor based on the calculation of cell eigenmodes in the infinite surface approximation. The method is intended for use at the first stage of the metasurface antenna synthesis, which consists in creating a database of cell tensorial impedances.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Il'in N. V., Komogortsev S. V., Krainova G. S., Ivanov V. A., Tkachenko I. A., Tkachev V. V., Plotnikov V. S., Iskhakov R. S.
Заглавие : Studying the temperature dependence of the intensity of magnetization of rapidly quenched Fe–Cu–Nb–Si–B alloys
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2021. - Vol. 85, Is. 9. - P.945-949. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873821090148
Примечания : Cited References: 11. - This work was supported by support of the Russian Foundation for Basic Research, project no. 19-32-90182; and as part of a State Task from the Ministry of Science and Higher Education, project No. 0657-2020-0005
Аннотация: A study is performed of rapidly quenched alloys of the Finemet type with different compositions. The Curie temperature, Bloch constant, critical exponent, and spontaneous magnetization at 0 K are calculated by analyzing the low- and high-temperature dependences of magnetization. A linear correlation is found between the constant of spin-wave stiffness and the Curie temperature.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Лемберг, Константин Вячеславович, Грушевский, Евгений Олегович, Подшивалов, Иван Валерьевич, Космынин А. Н., Космынина К. Н.
Заглавие : Методика синтеза и экспериментальное исследование антенн Ku-диапазона на основе тензорных метаповерхностей
Место публикации : Журн. СФУ. Техн. и технол. - 2021. - Т. 14, № 7. - С. 840-853. - ISSN 1999-494X (ISSN), DOI 10.17516/1999-494X-0358; J. Sib. Fed. Univ. Eng. Technol. - ISSN 2313-6057 (eISSN)
Примечания : Библиогр.: 18. - Исследование выполнено при финансовой поддержке РФФИ, Правительства Красноярского края и Красноярского краевого фонда науки в рамках научного проекта 20-47-243002
Аннотация: Антенны на основе тензорных метаповерхностей – это сравнительно новый тип антенн, появившийся в последнее десятилетие. Они отличаются простой конструкцией, но сложной процедурой синтеза, которая может быть основана на анализе свойств волн в периодических структурах или на основе интерпретации антенны как фазовой голограммы. В связи с новизной этого типа антенн представляет интерес исследование различных методик их синтеза, получение новых экспериментальных результатов и оценка на их основе реально достижимых характеристик таких антенн. Целью работы являлось экспериментальное исследование антенн на основе тензорных метаповерхностей c модулированным поверхностным импедансом, синтезированных по предложенной авторами методике. Для проведения исследований было использовано математическое моделирование, электродинамическое моделирование и измерения макетов антенн в ближней зоне излучения. В результате работы экспериментально подтверждено, что предложенная методика синтеза антенн на основе тензорных метаповерхностей позволяет получать антенны с заданными направлением излучения и поляризацией, которые обладают апертурной эффективностью до 50 %, шириной полосы рабочих частот до 8 % и уровнем кросс-поляризации ниже минус 20 дБ. Результаты измерений антенн хорошо согласуются с электродинамическим расчетом и заданными при синтезе параметрами. Описанный в работе тип антенн и приведенная методика их синтеза перспективны для ряда применений, например в спутниковой и мобильной связи.Antennas based on metasurfaces with tensorial impedance is a relatively new type of antennas appeared in the last decade. They have a simple design, but a complex synthesis procedure. The synthesis procedure can be based on analysis of the properties of waves in periodic structures or on representing the antenna as a phase hologram. Due to the novelty of this type of antennas, researching of various synthesis methods, obtaining new experimental results and on their basis assessment of realistically achievable characteristics is of interest. The purpose of the work was an experimental research of antennas based on metasurfaces with tensorial surface impedance, synthesized according to the method proposed by the authors. To carry out the research, mathematical modeling, electrodynamic modeling, and nearfield measurements of antenna prototypes were used. As a result, it was experimentally confirmed that the proposed tensorial metasurface antennas synthesis method makes it possible to obtain antennas with a given radiation direction and polarization, which have an aperture efficiency of up to 50 %, a bandwidth of up to 8 %, and a cross-polarization level below minus 20 dB. The results of measurements are in a good agreement with the electrodynamic calculation and the parameters specified during the synthesis. The type of antennas described in the work and the given synthesis method, according to the authors, are promising for various applications, for example, in satellite and mobile communications.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Cherkasskii, Mikhail, Farle M., Semisalova, Anna
Заглавие : Dispersion relation of nutation surface spin waves in ferromagnets
Коллективы : Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [392402498 (SE 2853/1-1), 405553726 CRC/TRR 270]; government of the Russian Federation [075-15-2019-1886]
Место публикации : Phys. Rev. B. - 2021. - Vol. 103, Is. 17. - Ст.174435. - ISSN 2469-9950, DOI 10.1103/PhysRevB.103.174435. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 45. - We acknowledge partial funding by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) Project No. 392402498 (SE 2853/1-1) and Project No. 405553726 CRC/TRR 270, and by the government of the Russian Federation (Agreement No. 075-15-2019-1886). We thank J.-E. Wegrowe, U. Nowak, and R. Mondal for valuable comments and helpful discussions
Предметные рубрики: FILMS
PROPAGATION
SOLITONS
Аннотация: Inertia effects inmagnetization dynamics are theoretically shown to result in a different type of spin waves, i.e., nutation surface spin waves, which propagate at terahertz frequencies in in-plane magnetized ferromagnetic thin films. Considering the magnetostatic limit, i.e., neglecting exchange coupling, we calculate dispersion relation and group velocity, which we find to be slower than the velocity of conventional (precession) spin waves. In addition, we find that the nutation surface spin waves are backward spin waves. Furthermore, we show that inertia causes a decrease of the frequency of the precession spin waves, namely magnetostatic surface spin waves and backward volume magnetostatic spin waves. The magnitude of the decrease depends on the magnetic properties of the film and its geometry.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Boev N. M., Gorchakovsky A. A., Galeev R. G.
Заглавие : Inspection probes of a ferromagnetic resonance scanning spectrometer
Место публикации : Instrum. Exp. Tech. - 2021. - Vol. 64, Is. 2. - P.277-284. - ISSN 00204412 (ISSN), DOI 10.1134/S0020441221010218
Примечания : Cited References: 24. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation as part of a complex project on the development of high-technology production facilities (agreement no. 075-11-2019-054, November 22, 2019)
Аннотация: The design of inspection probes for a scanning ferromagnetic resonance spectrometer, which are designed for recording the absorption spectra of electromagnetic energy by local areas of thin magnetic films, is described. The degree of locality is determined by the diameter of the measuring hole of the probe in the range of 0.1–1.0 mm. The sensitivity of the device is significantly increased due to the miniaturization of the heterogeneous measuring resonator and its comparatively high Q factor. A set of replaceable probes makes it possible to cover the frequency range of 0.1–6.0 GHz, the signal-to-noise ratio for a probe with a hole diameter of 0.8 mm, which was measured on a permalloy film with a thickness of 5 nm, is at least 20 dB.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F.
Заглавие : Interference traps waves in an open system: bound states in the continuum
Коллективы : Russian Foundation for Basic Research Projects [19-02-00055]
Место публикации : Rep. Prog. Phys. - 2021. - Vol. 84, Is. 5. - Ст.055901. - ISSN 0034-4885, DOI 10.1088/1361-6633/abefb9. - ISSN 1361-6633(eISSN)
Примечания : Cited References: 154. - The work was partially supported by Russian Foundation for Basic Research Projects No. 19-02-00055
Предметные рубрики: FANO RESONANCES
2ND-HARMONIC GENERATION
QUANTUM-SYSTEMS
UNIFIED THEORY
Аннотация: I review the four mechanisms of bound states in the continuum (BICs) in the application of microwave and acoustic cavities open to directional waveguides. The most simple are symmetry-protected BICs, which are localized inside the cavity because of the orthogonality of the eigenmodes to the propagating modes of waveguides. However, the most general and interesting is the Friedrich-Wintgen mechanism, when the BICs are the result of the fully destructive interference of outgoing resonant modes. The third type of BICs, Fabry-Perot BICs, occurs in a double resonator system when each resonator can serve as an ideal mirror. Finally, the accidental BICs can be realized in the open cavities with no symmetry like the open Sinai billiard in which the eigenmode of the resonator can become orthogonal to the continuum of the waveguide accidentally due to a smooth deformation of the eigenmode. We also review the one-dimensional systems in which the BICs occur owing to the fully destructive interference of two waves separated by spin or polarization or by paths in the Aharonov-Bohm rings. We make broad use of the method of effective non-Hermitian Hamiltonian equivalent to the coupled mode theory, which detects BICs by finding zero-width resonances.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pile S., Feggeler T., Schaffers T., Meckenstock R., Buchner M., Spoddig D., Zingsem B., Ney V., Farle M., Wende H., Ohldag H., Ney A., Ollefs K.
Заглавие : Non-standing spin-waves in confined micrometer-sized ferromagnetic structures under uniform excitation
Место публикации : Appl. Phys. Lett. - 2020. - Vol. 116, Is. 7. - Ст.072401. - ISSN 00036951 (ISSN), DOI 10.1063/1.5139881
Примечания : Cited References: 37. - The use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. The authors would like to thank the Austrian Science Foundation (FWF), Project No. I-3050 as well as the German Research Foundation (DFG), Project No. OL513/1-1 for financial support. K.O., H.W., B.Z and M.F. acknowledge additional funding from Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 405553726 – TRR 270 and B.Z and M.F. acknowledge additional funding from Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation
Аннотация: A non-standing characteristic of directly imaged spin-waves in confined micrometer-sized ultrathin Permalloy (Ni80Fe20) structures is reported along with evidence of the possibility to alter the observed state by modifications to the sample geometry. Using micromagnetic simulations, the presence of the spin-wave modes excited in the Permalloy stripes along with the quasi-uniform modes was observed. The predicted spin-waves were imaged in direct space using time resolved scanning transmission X-ray microscopy, combined with a ferromagnetic resonance excitation scheme (STXM-FMR). STXM-FMR measurements revealed a non-standing characteristic of the spin-waves. Also, it was shown by micromagnetic simulations and confirmed using STXM-FMR results that the observed characteristic of the spin-waves can be influenced by the local magnetic fields in different sample geometries.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spin-wave oscillations in gradient ferromagnets: Exactly solvable models
Место публикации : J. Magn. Magn. Mater. - 2020. - Vol. 510. - Ст.166643. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2020.166643
Примечания : Cited References: 36. - This work was partially supported by Russian Foundation for Basic Research , Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project No 18-42-243005 “Synthesis and investigation of magnetic properties of gradient materials that are characterized by predetermine type of the magnetic parameter change” and Krasnoyarsk Regional Fund of Science in the framework of participation in the conference “VII Euro-Asian Symposium ”Trends in MAGnetism” (EASTMAG 2019)”
Аннотация: The method of searching for the profiles of the gradient dependence of the material parameters of matter on the coordinates that allow the exact solution of wave equations, developed previously for electromagnetic and elastic waves, was generalized to spin waves in gradient ferromagnets. Such profiles were found and exact solutions of the wave equations for a ferromagnet with uniaxial magnetic anisotropy β(z) or exchange α(z) varying in space were obtained. The obtained solutions were used to develop the theory of spin-wave resonance in gradient thin magnetic films. The dependences of the eigenfunctions mn(z), the frequencies of the discrete spectrum ωn, and the high-frequency susceptibility χn on the number of spectral levels n were found. The cardinal differences between the spin-wave spectra of films with gradients β(z) and α(z) are shown. The variable anisotropy β(z) changes the shape of the energy potential of the magnetic film and leads to a change in the discrete spectrum for frequencies ωn(n) lower than the frequency of the gradient potential well or potential barrier ωc. The variable exchange α(z) does not change the shape of the energy potential. Spin-wave oscillations occur in a rectangular potential well created by the surfaces of the film, regardless of profile α(z). The discrete frequency spectrum ωn(n) is quadratic on n, or has negligible deviations from the quadratic, for all n. An analytical expression for the effective exchange parameter is obtained. Exact solutions of the Schrodinger equation with spatially dependent effective mass m(z) were found for the profile of m(z) inverse to the function of α(z).
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Resonant bending of silicon nanowires by incident light
Место публикации : Opt. Lett. - 2020. - Vol. 45, Is. 19. - P.5315-5318. - ISSN 01469592 (ISSN), DOI 10.1364/OL.406109
Примечания : Cited References: 29
Аннотация: Coupling of two dielectric wires with a rectangular cross section gives rise to bonding and anti-bonding resonances. The latter is featured by extremal narrowing of the resonant width for variation of the aspect ratio of the cross section and distance between wires. A plane wave resonant to this anti-bonding resonance gives rise to unprecedent enhancement of the optical forces up to several nano Newtons per micrometer length of the wires. The forces oscillate with the angle of incidence of the plane wave but always try to repel the wires. If the wires are fixed at the ends, the light power 1.5mW/µm2 bends wires with length 50 µm by order 100 nm.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vazhenina I. G., Chekanova L. A., Iskhakov R. S.
Заглавие : Spin-Wave Resonance Detection of Nanostructured Magnetic Alloy Inhomogeneities, Using the Example of Co–P and Co–Ni Planar Systems
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 6. - P.713-715. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819060364
Примечания : Cited References: 12. - The reported study was funded by the Russian Foundation for Basic Research, the Government of Krasnoyarsk Krai, and the Krasnoyarsk Regional Fund of Science as part of research project no. 18-42-243005 “Synthesis and Investigation of Magnetic Properties of Gradient Materials Characterized by a Predetermined Type of the Magnetic Parameter Change.”
Аннотация: Inhomogeneous layered magnetic thin films of amorphous and nanocrystalline Со–Р and Co–Ni alloys are studied via spin-wave resonance. It is found that the formation of a magnetic potential profile specified over the coating thickness leads to characteristic modifications of the spin-wave resonance spectrum. Another important factor that determines the type of modification is the dominant magnetic parameter (the constant of magnetization or exchange coupling).
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19.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Shepeta N. A., Denisova E. A., Bucaemskii A. A., Tynchenko V. S., Gorodov A. A.
Заглавие : Stress-wave change in the copper structure: Covering magnetic response
Коллективы : International Conference on Mechanical Engineering, Automation and Control Systems
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2019. - Vol. 560: 13th International Conference on Mechanical Engineering, Automation and Control Systems, MEACS 2018 (12 December 2018 through 14 December 2018, ) Conference code: 149903, Is. 1. - Ст.012158. - , DOI 10.1088/1757-899X/560/1/012158
Примечания : Cited References: 15
Аннотация: The work presents the results of the investigationof deformation processes occurring in copper after stress-wave influence. Structural changes analysis is carried out by direct research methods (X-ray phase analysis and optical microscopy) along and perpendicular to the spreading direction of the stress wave front in the copper foil plane. For more information, investigations have been conducted by an indirect method using ferromagnetic resonance of magnetic characteristics. As a magnetic covering, Co/Ni-type multilayer films are deposited on the copper foil, which makes it possible to apply magnetic research methods. The magnetic response of the multilayer covering correlates with the modification of the copper structure observed by direct methods. The information obtained in the course of research allows us to conclude that the wave character of the deformation processes occurring in copper is natural. The value and direction of structural modifications vary along the sample length as a function with a long-wave period is about 30 mm, which is consistent with the inhomogeneous distribution model of internal stresses. Throughout the sample length, alternating areas of stretching and compression of copper grains are fixed along the spreading direction of the stress wave front. The greatest stretching of the structural elements is observed at a distance equal to almost half the wavelength of the mechanical deformation field. Thus, the translational (shear) mode of the mechanical field of material plastic flow appears as the results of the investigation. © 2019 Published under licence by IOP Publishing Ltd.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V., Volkov N. V.
Заглавие : Scattering of Electromagnetic Waves on a Subwave Lattice of Square Strip Conductors
Коллективы : Ministry of Education and Science of the Russian Federation [14.575.21.0279, RFMEFI57517X0142]
Место публикации : J. Commun. Technol. Electron. - 2019. - Vol. 64, Is. 7. - P.664-674. - ISSN 1064-2269, DOI 10.1134/S1064226919070039. - ISSN 1555-6557(eISSN)
Примечания : Cited References: 24. - The study was supported by the Ministry of Education and Science of the Russian Federation (agreement no. 14.575.21.0279, unique project identifier RFMEFI57517X0142).
Предметные рубрики: MULTILAYER BANDPASS FILTER
DIELECTRIC LAYERS
DESIGN
MESH
Аннотация: Simple formulas are obtained for calculating the scattering matrix of a plane electromagnetic wave incident normally on an infinite 2D lattice formed by square strip conductors and located at the interface of two dielectric media. For the first time, the vortex behavior of the electric field of the lattice was taken into account, which made it possible to repeatedly reduce the computation error at high frequencies. This is confirmed by the close agreement of the amplitude-frequency responses of the structure calculated by the formulas with the characteristics obtained by the numerical electrodynamic analysis of the 3D model when the lattice period is less than half the wavelength.
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