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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kosyrev N. N., Patrin G. S., Shiyan Ya. G., Volchenko E. N., Yakovchuk V. Yu., Komarov V. A., Semenov S. V.
Заглавие : Influence of the DyxCo1-x–Bi interface on the magnetic properties of DyxCo1-x/Bi/Py three-layer structures
Колич.характеристики :6 с
Место публикации : J. Supercond. Nov. Magn. - 2024. - Vol. 37, Is. 2. - P.419-424. - ISSN 15571939 (ISSN), DOI 10.1007/s10948-024-06690-0. - ISSN 15571947 (eISSN)
Примечания : Cited References: 15. - The authors are grateful to R.Yu. Rudenko for carrying out measurements using an atomic force microscopeThe research was conducted according to the state assignment of the Ministry of Science and Higher Education of the Russian Federation and the Federal State Autonomous Educational Institution of Higher Education Siberian Federal University (No. FSRZ-2023–0008)
Аннотация: The interlayer interactions in multilayer systems with a non-magnetic semimetallic interlayer are great of interest. The magnetic and structural properties of the DyxCo1-x/Bi/Py systems (17 ˂ x ˂ 26 at.%) have been studied. The temperature dependences of magnetization in the range 4.2–300 K were measured for the first time. The influence of the bismuth interlayer thickness on the exchange interaction between the DyCo and Py layers was found as well as the critical value of its thickness. The obtained atypical value of the period of exchange bias oscillations was explained by the formation of bismuth compounds with dysprosium–pnictogenides at bismuth thicknesses below the critical value. The interface was investigated by spectral ellipsometry in the range 2–5 eV. The information on the structure of the surface obtained by atomic force microscopy was used to create a multilayer model for fitting experimental ellipsometric data. Analysis of the optical properties showed that pnictogenide Dy3Bi2 is formed at the interface, which affects the general magnetic state of the samples studied.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnov, Mikhail, Roginskii, Evgenii, Savin, Aleksandr, Oreshonkov A. S., Pankin, Dmitrii
Заглавие : Density-functional study of the Si/SiO2 interfaces in short-period superlattices: Vibrational states and Raman spectra
Колич.характеристики :18 с
Место публикации : Photonics. - 2023. - Vol. 10, Is. 8. - Ст.902. - ISSN 23046732 (eISSN), DOI 10.3390/photonics10080902
Примечания : Cited References: 61. - The study was supported by grants from the Russian Science Foundation (project No. 22-22-20021) and the Saint-Petersburg Science Center (project No. 32/2022), using the resources of the Computing Center and the Center for Optical and Laser Materials Research at the Research Park of St. Petersburg State UniversityThe study was performed using the resources of the Computing Center and the Center for Optical and Laser Materials Research at the Research Park of St. Petersburg State University. The authors thank Konstantin Smirnov for his valuable advice. The calculations were also performed in part using the facilities of the JSCC supercomputer center at RAS and the Konstantinov computational center at the Ioffe Institute
Аннотация: Raman spectroscopy has proven its effectiveness as a highly informative and sensitive method for the nondestructive analysis of layered nanostructures and their interfaces. However, there is a lack of information concerning the characteristic phonon modes and their activity in Si/SiO2 nanostructures. In order to overcome this problem, the phonon states and Raman spectra of several Si/SiO2 superlattices (SL) with layer thicknesses varied within 0.5–2 nm are studied using DFT-based computer modeling. Two types of structures with different interfaces between crystalline silicon and SiO2 cristobalite were studied. A relationship between the phonon states of heterosystems and the phonon modes of the initial crystals was established. Estimates of the parameters of deformation potentials are obtained, with the help of which the shifts of phonon frequencies caused by elastic strains in the materials of the SL layers are interpreted. The dependence of intense Raman lines on the SL structure has been studied. Several ways have been proposed to use this information, both for identifying the type of interface and for estimating the structural parameters. The obtained information will be useful for the spectroscopic characterization of the silicon/oxide interfaces.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Kobyakov A. V., Yushkov V. I., Anisimov I. O., Zharkov S. M., Semenov S. V., Moiseenko, Evgeniy T.
Заглавие : Influence of a thin V2O3 spacer on interlayer interactions in Fe-Ni/V2O3/FeNi film structures
Колич.характеристики :10 с
Место публикации : Processes. - 2023. - Vol. 11, Is. 7. - Ст.2084. - ISSN 22279717 (eISSN), DOI 10.3390/pr11072084
Примечания : Cited References: 25. - The research was conducted according to the state assignment of the Ministry of Science and Higher Education of the Russian Federation and the Federal State Autonomous Educational Institution of Higher Education Siberian Federal University (No. FSRZ-2023-0008)
Аннотация: In this paper, we explore the suggestions of the results of experimental studies on low-dimensional layered systems in FeNi/V2O3/FeNi film structures. The multifunctional material V2O3 is used as an interlayer between the magnetically active FeNi layers. The films were obtained by ultrahigh vacuum magnetron sputtering on a glass substrate with a base size of 10−10 Torr. It has been found that for V2O3 films, the decrease in the metal–semiconductor transition temperature increases significantly. Magnetic characteristics were studied on the MPMS-XL SQUID magnetometer. The exchange effect occurs both in the region where the oxide has a magnetic order and in the paramagnetic region. The latter is due to the effect of the magnetic panel in the oxide package. The phenomenon of oscillation of the exchange field occurs depending on the phenomenon of intermediate observation observed experimentally.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Visotin M. A., Sosedkin, Oleg A., Eremkin, Egor V.
Заглавие : MD investigations of of heat flow throw interfaces in 1D systems
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2023. - Vol. 16, Is. 3. - P.385-396. - ISSN 19971397 (ISSN); Журн. СФУ. Матем. и физ. - ISSN 23136022 (eISSN)
Примечания : Cited References: 26
Аннотация: Molecular dynamic calculations (MD) of heterogeneous 1D periodical systems are presented. It is proposed the new technique of direct calculations of thermal conductivity, where there is only one thermostat in one piece of unit cell as well as another piece where artificial friction forces act on atoms. With the help of this scheme, calculations of 1D heterogeneous systems having regions with atoms of different atomic masses are presented. It is shown that the difference in atomic masses in adjacent regions of the systems leads to a significant temperature jump at interfaces between these regions. This temperature jump exists independently of the mass ratio on both sides of the interface.The reasons for these jumps are discussed. It is also shown that, by changing the alternation of regions with different masses of atoms, it is possible to reduce the total thermal conductivity of the system by several times. On the base of these results, we can hope that for three-dimensional structures also, the thermal conductivity can be significantly reduced.Представлены молекулярно-динамические расчеты (МД) гетерогенных одномерных периодических систем. Предлагается новая методика прямых расчетов теплопроводности, при которой в одном элементе элементарной ячейки находится только один термостат, а в другом элементе действуют силы искусственного трения на атомы. С помощью этой схемы представлены расчеты одномерных гетерогенных систем, имеющих области с атомами разной атомной массы. Показано, что различие атомных масс в соседних областях систем приводит к значительному скачку температуры на границах раздела между этими областями. Этот скачок температуры существует независимо от отношения масс по обе стороны от границы раздела. Обсуждаются причины этих скачков. Также показано, что, изменяя чередование областей с разной массой атомов, можно в несколько раз уменьшить общую теплопроводность системы. На основании этих результатов можно надеяться, что и для трехмерных структур теплопроводность может быть значительно снижена.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bondarev I. A., Rautskii M. V., Volkov N. V., Lukyanenko A. V., Yakovlev I. A., Varnakov S. N., Tarasov A. S.
Заглавие : The role of SiO2/Si interface in magnetic field driven lateral photovoltaic effect in Mn/SiO2/n-Si and Fe/SiO2/p-Si MIS structures
Коллективы : Samarkand International Symposium on Magnetism, Samarkand State University
Место публикации : Book of abstacts of Samarkand International Symposium on Magnetism (SISM-2023)/ int. adv. com. S. G. Ovchinnikov [et al.]. - 2023. - Ст.3OT-A-8. - P.145. - ISBN 978-5-00202-320-2
Примечания : Cited References: 1
Материалы конференции,
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev I. A., Rautskii M. V., Volkov N. V., Lukyanenko A. V., Yakovlev I. A., Varnakov S. N., Tarasov A. S.
Заглавие : Lateral photovoltaic effect in silicon-based hybrid structures under external magnetic field
Колич.характеристики :6 с
Место публикации : Mater. Sci. Semicond. Process. - 2023. - Vol. 167. - Ст.107786. - ISSN 13698001 (ISSN), DOI 10.1016/j.mssp.2023.107786. - ISSN 18734081 (eISSN)
Примечания : Cited References: 32
Аннотация: Charge transport in semiconductor devices is highly sensitive to light, which opens up wide application prospects. The lateral photovoltaic effect (LPE) is widely used in position sensitive detectors due to its high sensitivity to the light spot position. We report on the features of the LPE in silicon-based metal/insulator/semiconductor structures at helium temperatures. To investigate the LPE, Fe/SiO2/p-Si and Mn/SiO2/n-Si structures have been fabricated by molecular beam epitaxy. It has been found by studying the lateral photovoltage that the SiO2/Si interface plays a significant role in transport of photogenerated carriers, mainly via the interface states, which induce electron capture/emission processes at certain temperatures. The value of the photovoltage is likely affected not only by the metallic film thickness, but also by the substrate conductivity type and Schottky barrier. The effect of the magnetic field on the LPE is driven by two mechanisms. The first one is the well-known action of the Lorentz force on photogenerated carriers and the second one is shifting of the interface state energy levels. Basically, the magnetic field suppresses the contribution of the interface states to the LPE, which suggests that the interface-induced transport can be controlled magnetically.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samardak, Alexander S., Ognev, Alexey, V, Kolesnikov, Alexander G., Stebliy, Maksim E., Samardak, Vadim Yu, Iliushin, Ilia G., Pervishko, Anastasiia A., Yudin, Dmitry, Platunov M. S., Ono, Teruo, Wilhelm, Fabrice, Rogalev, Andrey
Заглавие : XMCD and ab initio study of interface-engineered ultrathin Ru/Co/W/Ru films with perpendicular magnetic anisotropy and strong Dzyaloshinskii-Moriya interaction
Коллективы : Russian Ministry of Science and Higher Education [075-15-2021-607, 0657-2020-0013]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-32-60020]; Russian Federation President Scholarship for Young Scientists [SP-1640.2021.5]; Russian Science FoundationRussian Science Foundation (RSF) [21-42-00041]; Russian Ministry of Science and Higher Education
Место публикации : Phys. Chem. Chem. Phys. - 2022. - Vol. 24, Is. 14. - P.8225-8232. - ISSN 1463-9076, DOI 10.1039/d1cp05456b. - ISSN 1463-9084(eISSN)
Примечания : Cited References: 47. - A. V. O., I. G. I. and T. O. thank the Russian Ministry of Science and Higher Education for state support of scientific research conducted under the supervision of leading scientists in Russian institutions of higher education, scientific foundations and state research centers (Project No. 075-15-2021-607) in parts of sample preparation and its magnetic characterization. The micromagnetic simulations performed by M. E. S. were supported by the Russian Ministry of Science and Higher Education under the state task (0657-2020-0013). A. A. P. (ab initio calculations) acknowledges the support from the Russian Foundation for Basic Research (Project No. 19-32-60020) and the Russian Federation President Scholarship for Young Scientists (SP-1640.2021.5). The work of A. S. S. related to the experimental and analytical study of DMI and skyrmion bubbles was supported by the Russian Science Foundation (Project No. 21-42-00041). The authors acknowledge the use of computational resources of the Skoltech supercomputer Zhores47 to obtain the theoretical results presented in this paper. The authors thank ID12 beamline staff for their help during the XMCD experiment and gratefully acknowledge the provision of beamtime (Proposal MA-3661) by the ESRF. The research contribution of M. P. (XMCD anaysis) was partially funded by the Russian Ministry of Science and Higher Education via the budget project of SRF SKIF, Boreskov Institute of Catalysis
Предметные рубрики: TOTAL-ENERGY CALCULATIONS
CIRCULAR-DICHROISM
MOLECULAR-DYNAMICS
Аннотация: Understanding the nature of recently discovered spin–orbital induced phenomena and a definition of a general approach for “ferromagnet/heavy-metal” layered systems to enhance and manipulate spin–orbit coupling, spin–orbit torque, and the Dzyaloshinskii–Moriya interaction (DMI) assisted by atomic-scale interface engineering are essential for developing spintronics and spin-orbitronics. Here, we exploit X-ray magnetic circular dichroism (XMCD) spectroscopy at the L2,3-edges of 5d and 4d non-magnetic heavy metals (W and Ru, respectively) in ultrathin Ru/Co/W/Ru films to determine their induced magnetic moments due to the proximity to the ferromagnetic layer of Co. The deduced orbital and spin magnetic moments agree well with the theoretically predicted values, highlighting the drastic effect of constituting layers on the system's magnetic properties and the strong interfacial DMI in Ru/Co/W/Ru films. As a result, we demonstrate the ability to simultaneously control the strength of magnetic anisotropy and intermixing-enhanced DMI through the interface engineered inversion asymmetry in thin-film chiral ferromagnets, which are a potential host for stable magnetic skyrmions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Koblischka, Michael R., Koblischka-Veneva, Anjela, Gokhfeld D. M., Naik, S. Pavan Kumar, Nouailhetas, Quentin, Berger, Kevin, Douine, Bruno
Заглавие : Flux pinning docking interfaces in satellites using superconducting foams as trapped field magnets
Коллективы : ANRFrench National Research Agency (ANR); DFGGerman Research Foundation (DFG)European Commission [ANR-17-CE05-0030, DFG-ANR Ko2323-10]
Место публикации : IEEE Trans. Appl. Supercond. - 2022. - Vol. 32, Is. 4. - Ст.4900105. - ISSN 1051-8223, DOI 10.1109/TASC.2022.3147734. - ISSN 1558-2515(eISSN)
Примечания : Cited References: 44. - This work was supported in part by SUPERFOAM international project funded by ANR and DFG under Grants ANR-17-CE05-0030 and DFG-ANR Ko2323-10.
Предметные рубрики: BULK
RECONFIGURATION
MAGNETIZATION
Аннотация: Flux-Pinning Docking Interfaces (FPDI) in satellite systems were developed using bulk superconductors and permanent magnets in previous works. However, such FPDIs have limited magnetic field strength, consist of heavy-weight material, and can only be used with a single purpose, i.e., as chasing or docking satellite. Replacing the magnetic material in the FPDI by a trapped field (TF)-magnet would enable the interface to operate for both purposes, i.e., generating a (stronger) magnetic field and trapping it. We show the requirements for such a system and discuss the possible gains when using a TF-FPDI in satellites. To reduce the system weight, the use of superconducting foams as superconducting material is discussed in detail. Furthermore, the use of superconducting foams, the size of which can be easily upscaled, may also comprise the function of the damping material, so even more weight could be saved for the payload.
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Вид документа : Однотомное издание
Шифр издания :
Заглавие : Soft photonic crystals and metamaterials
Выходные данные : Bazel; Beijing; Wuhan: MDPI, 2022
Колич.характеристики :VII с ; 127 с
ISBN, Цена 978-3-0365-6074-8
ISBN, Цена 978-3-0365-6073-1
Идентификационный №: DOI 10.3390/ma15228096
Содержание : Special issue: Soft photonic crystals and metamaterials/ I. V. Timofeev, W. Lee. Double-resolved beam steering by metagrating-based Tamm plasmon polariton/ R. G. Bikbaev, D. N. Maksimov, K. - P. Chen, I. V. Timofeev. Chiral optical Tamm states at the interface between a Dye-doped cholesteric liquid crystal and an anisotropic mirror/ A. Yu. Avdeeva, S. Ya. Vetrov, R. G. Bikbaev [et al.]. Chiral-selective Tamm plasmon polaritons/ M. -Y. Lin, W. -H. Xu, R. G. Bikbaev [et al.].
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Eremin E. V., Moshkina E. M., Selyanina A. V., Bondarenko G. N., Shabanov A. V.
Заглавие : Synthesis, structural and magnetic properties of ludwigite Mn1.32Ni0.85Cu0.83BO5
Место публикации : Phys. Solid State. - 2022. - Vol. 64, Is. 11. - P.1743-1749. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2022.11.54200.425. - ISSN 10906460 (eISSN)
Примечания : Cited References: 19. - The study was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science within scientific project No. 20-42-240011. The research was carried out using the equipment provided by the Krasnoyarsk Regional Center for Collective Use
Аннотация: Single crystals of Mn1.32Ni0.85Cu0.83BO5 with the ludwigite structure were obtained by the solution-melt method during spontaneous crystallization. The concentration of copper, manganese and nickel ions was determined by transmission microscopy. Manganese ions are included in compounds in the divalent and trivalent states. The study of temperature and field dependences showed that we have several magnetic transitions. The first transition, associated with the ferrimagnetic ordering of the magnetic moments of parts of the ions, observed in the region of 50 K. In the region of 25 K, a second magnetic transition is observed. Substitution of nickel ions for copper and divalent manganese of better disorder and competition of exchange interactions, which leads to the division of the magnetic system into several magnetic subsystems that are ordered at different temperatures.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avdeeva A. Yu., Vetrov S. Ya., Timofeev I. V.
Заглавие : Splitting of a Tamm plasmon polariton at the interface between a metal and a resonant nanocomposite layer conjugated with a photonic crystal
Место публикации : J. Opt. Soc. Am. B. - 2021. - Vol. 38, Is. 6. - P.1792-1797. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.420490
Примечания : Cited References: 36. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 19-42-240004 and by Russian Foundation for Basic Research, project No. 19-52-52006. The authors are thankful to Pavel S. Pankin for valuable discussions and comments
Аннотация: Splitting of a Tamm plasmon polariton at the interface between a metal and a nanocomposite layer conjugated with a photonic crystal (Bragg mirror) has been theoretically investigated. The splitting can be implemented when the Tamm plasmon polariton frequency approaches the resonance frequency of the nanocomposite, which consists of metallic nanoballs dispersed in a transparent matrix. The reflectance spectrum of the p-polarized waves at the normal incidence of light has been calculated. It has been established that the Tamm plasmon polariton splitting significantly depends on the concentration of nanoballs in the nanocomposite layer and its thickness. The solution of the dispersion equation derived for a sample with semi-infinite mirrors has been compared with the spectra obtained for a finite structure by the transfer matrix method.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Shiyan Ya. G., Chzhan A. V., Podorozhnyak S. A.
Заглавие : Influence of interface anisotropy on ferromagnetic resonance in CoP/(NiP)am/CoP films
Коллективы : State order of the Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0011]
Место публикации : Mater. Res. Express. - 2021. - Vol. 8, Is. 5. - Ст.056102. - ISSN 2053-1591(eISSN), DOI 10.1088/2053-1591/abfcf5
Примечания : Cited References: 22. - This work was supported by the State order of the Ministry of Science and Higher Education of the Russian Federation (topic No. FSRZ-2020-0011)
Предметные рубрики: MAGNETIC-ANISOTROPY
MULTILAYERS
Аннотация: The paper presents the results of ferromagnetic resonance studies of three-layer magnetic films, where the magnetic layers are amorphous magnetically soft CoP layers, and the intermediate non-magnetic spacer is amorphous NiP layer. We found that, regardless of the nonmagnetic layer thickness, the interlayer interaction is ferromagnetic. Perpendicular anisotropy forms at the interface between the CoP and NiP layers. It is reasonable to suppose that the interlayer interaction is long-range, what is not typical for systems with metallic non-magnetic spacers.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Yakovchuk V. Yu., Vazhenina I. G., Iskhakov R. S.
Заглавие : Study of surface anisotropy of the interface of two-layer DyCo/FeNi Films by the spin-wave resonance method
Коллективы : RFBRRussian Foundation for Basic Research (RFBR); Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science [20-42-240010]
Место публикации : J. Supercond. Nov. Magn. - 2021. - Vol. 34, Is. 11. - P.2969-2975. - ISSN 1557-1939, DOI 10.1007/s10948-021-06001-x. - ISSN 1557-1947(eISSN)
Примечания : Cited References: 29. - The research was funded by RFBR, Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science, project number 20-42-240010
Предметные рубрики: UNIDIRECTIONAL ANISOTROPY
FERROMAGNETIC-RESONANCE
MAGNETIC-FILMS
Аннотация: Two-layer DyCo/FeNi films were studied by the spin-wave resonance method. The experimental microwave frequency absorption spectra of the two-layer DyCo/FeNi films demonstrate the bulk and surface peaks of the exchange spin modes. The dependence of the surface condition type formed at the interface on the composition of the hard-magnetic layer (before and after the compensation point) was found. The values of the surface anisotropy constant and the type of magnetization pinning at each surface of the FeNi layer were estimated.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sokolov A. Е., Ivanova O. S., Fedorov A. S., Kovaleva E. A., Vysotin M. A., Lin, C-R, Ovchinnikov S. G.
Заглавие : Why the magnetite-gold core-shell nanoparticles are not quite good and how to improve them
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52002]; Ministry of Science and Technology of TaiwanMinistry of Science and Technology, Taiwan [109-2112-M-153-003, 108-2923-M-153-001-MY3]
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 10. - P.1536-1540. - ISSN 1063-7834, DOI 10.1134/S1063783421090365. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 35. - This study was supported by the Russian Foundation for Basic Research, project no. 19-52-52002, and the Ministry of Science and Technology of Taiwan, projects MOST nos. 109-2112-M-153-003 and 108-2923-M-153-001-MY3
Предметные рубрики: IRON-OXIDE NANOPARTICLES
TOTAL-ENERGY CALCULATIONS
STABILITY
DESIGN
Аннотация: The nature of the formation of a chemical bond at the magnetite-gold interface has been studied. The geometric structure and the electronic and magnetic properties of plane layers consisting of magnetite Fe3O4 and gold have been investigated using the DFT-GGA calculation. It has been found that the specific energy and the wetting parameter of the magnetite-gold interface are negative, which leads to the island growth of small Au particles on the Fe3O4 surface. The role of an intermediate thin titanium layer between magnetite and gold has been discussed. The specific energy and wetting parameter of the magnetite-titanium (for thin Ti layers) and magnetite-titanium-gold interfaces are positive. It has been suggested that an intermediate thin titanium layer at the interface between the magnetite nanoparticle surface and the gold layer will make it possible to obtain magnetite nanoparticles with a continuous gold coating.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostikov D. A., Krakhalev M. N., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Nematic structures under conical anchoring at various director tilt angles specified by polymethacrylate compositions
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [20-42-240007]
Место публикации : Polymers. - 2021. - Vol. 13, Is. 17. - Ст.2993. - ISSN 2073-4360(eISSN), DOI 10.3390/polym13172993
Примечания : Cited References: 49. - Mikhail N. Krakhalev and Oxana O. Prishchepa acknowledge financial support from Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (No 20-42-240007)
Предметные рубрики: LIQUID-CRYSTAL
PRETILT ANGLE
ALIGNMENT LAYERS
SURFACE
INTERFACE
Аннотация: Dependence of the director tilt angle of nematic liquid crystal (LC) under conical anchoring from the two-component polymer mixture composition has been studied. We varied the ratio of poly(isobutyl methacrylate) (PiBMA), which specifies a conical anchoring for the nematic liquid crystal LN-396, and poly(methylmethacrylate) (PMMA) assigning a tangential alignment for the same nematic. An oblique incidence light technique to determine a tilt angle has been used. It has been shown that the tilt angle increases from 0∘ to 47.7∘ when PiBMA:PMMA ratio changes in the range 30:70 to 100:0. The specific optical textures viewed under the polarizing microscope and proper orientational structures have been considered for various compositions of the polymer films. An electric field action on the formed orientational structures has been investigated. The obtained results are promising for the application in various electro-optical LC devices with a conical anchoring in which the director tilt angle is a crucial parameter: a controlled diffraction gratings, an electrically operated achromatic rotators of linear light polarization, etc.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avdeeva A. Yu., Vetrov S. Ya., Bikbaev R. G., Pyatnov M. V., Rudakova N. V., Timofeev I. V.
Заглавие : Chiral optical Tamm states at the interface between a Dye-doped cholesteric liquid crystal and an anisotropic mirror
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [19-42-240004]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52006]
Место публикации : Materials. - 2020. - Vol. 13, Is. 15. - Ст.3255. - ISSN 1996-1944(eISSN), DOI 10.3390/ma13153255
Примечания : Cited References: 44. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No. 19-42-240004 and by Russian Foundation for Basic Research, project No. 19-52-52006
Предметные рубрики: PHASE
POLARIZATION
MODES
Аннотация: The resonant splitting of optical Tamm state numerically is demonstrated. The Tamm state is localized at the interface between a resonant chiral medium and a polarization-preserving anisotropic mirror. The chiral medium is considered as a cholesteric liquid crystal doped with resonant dye molecules. The article shows that the splitting occurs when dye resonance frequency coincides with the frequency of the Tamm state. In this case the reflectance, transmittance, and absorptance spectra show two distinct Tamm modes. For both modes, the field localization is at the interface between the media. The external field control of configurable optical and structural parameters paves the way for use in tunable chiral microlaser.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov I. A., Bondarev I. A., Romanenko A. I.
Заглавие : α-FeSi2 as a buffer layer for β-FeSi2 growth: analysis of orientation relationships in silicide/Silicon, silicide/silicide heterointerfaces
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-243013]; Ministry of Education and Science of the Russian FederationMinistry of Education and Science, Russian Federation; Siberian Branch of the Russian Academy of SciencesRussian Academy of Sciences [II.8.70]
Место публикации : J. Surf. Ingestig. - 2020. - Vol. 14, Is. 4. - P.851-861. - ISSN 1027-4510, DOI 10.1134/S1027451020040357. - ISSN 1819-7094(eISSN)
Примечания : Cited References: 74. - The work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project no. 18-42-243013. The work was partially supported by the Ministry of Education and Science of the Russian Federation and by Siberian Branch of the Russian Academy of Sciences (Project II.8.70)
Предметные рубрики: β-FeSi2 thin-films
Thermal-expansion
Phase-transformation
Аннотация: In this manuscript, we attempt to clarify the capability of utilisation of α-FeSi2 nanocrystals as a buffer layer for growth of monocrystalline/high-quality β-FeSi2 direct-gap semiconductor from the point of view of the crystal lattice misfits and near coincidence site (NCS) lattices. Iron silicides-based nanostructures have a wide spectrum of possible industrial applications in different fields. Mainly, interest in these functional materials is caused by their ecological safety and Earth’s core abundance that give us the opportunity for greener future with highly effective electronic devices. β-FeSi2 phase due to its allowed direct transition with energy close to 0.87 eV can be used as active material in light emission diodes (LED). Utilisation of buffer layers between silicon substrate and give one more tool to engineer the band structure of semiconducting β‑FeSi2 phase. We attempt to clarify the capability of the utilisation of the α-FeSi2 phase as a buffer layer for the growth of β-FeSi2 direct-gap semiconductor from the point of view of the crystal lattice misfits and near coincidence site (NCS) lattices. Possible β-FeSi2/α-,γ-,s-FeSi2/Si orientation relationships (ORs) and habit planes were examined with crystallogeometrical approaches and compared with β-FeSi2/Si ones. The lowest interplanar and interatomic spacing misfits between silicon lattice and a silicide one are observed for the pair of s-FeSi2{011}[200]/Si{022}[100] at room temperature and equal to –0.57%. The least interplanar and interatomic spacing misfit of 1.7 and 1.88%, respectively, for β-FeSi2/Si, can be decreased as low as –0.67 (interplanar) and 0.87 (interatomic) % by placing an α-FeSi2 layer between silicon and β-FeSi2 phase. It is stated that the growth of metastable γ-FeSi2 is also favourable on silicon due to low interplanar and interatomic spacing misfit (–0.77%) and a higher density of NCS in comparison with s-FeSi2. Design and technological procedure for the synthesis of possible β-FeSi2/α-FeSi2/Si heterostructure have been proposed based on the results obtained.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Visotin M. A., Tarasov I. A., Fedorov A. S., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Prediction of orientation relationships and interface structures between α-, β-, γ-FeSi2 and Si phases
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [16-13-00060-Pi]
Место публикации : Acta Crystallogr. B. - 2020. - Vol. 76. - P.469-482. - ISSN 2052-5206(eISSN), DOI 10.1107/S2052520620005727
Примечания : Cited References: 85. - The following funding is acknowledged: Russian Science Foundation (grant No. 16-13-00060-Pi).
Предметные рубрики: THERMAL-EXPANSION
BETA-FESI2 FILMS
GROWTH
SILICON
DIFFRACTION
Аннотация: A pure crystallogeometrical approach is proposed for predicting orientation relationships, habit planes and atomic structures of the interfaces between phases, which is applicable to systems of low-symmetry phases and epitaxial thin film growth. The suggested models are verified with the example of epitaxial growth of α-, γ- and β-FeSi2 silicide thin films on silicon substrates. The density of near-coincidence sites is shown to have a decisive role in the determination of epitaxial thin film orientation and explains the superior quality of β-FeSi2 thin grown on Si(111) over Si(001) substrates despite larger lattice misfits. Ideal conjunctions for interfaces between the silicide phases are predicted and this allows for utilization of a thin buffer α-FeSi2 layer for oriented growth of β-FeSi2 nanostructures on Si(001). The thermal expansion coefficients are obtained within quasi-harmonic approximation from the DFT calculations to study the influence of temperature on the lattice strains in the derived interfaces. Faster decrease of misfits at the α-FeSi2(001)||Si(001) interface compared to γ-FeSi2(001)||Si(001) elucidates the origins of temperature-driven change of the phase growing on silicon substrates. The proposed approach guides from bulk phase unit cells to the construction of the interface atomic structures and appears to be a powerful tool for the prediction of interfaces between arbitrary phases for subsequent theoretical investigation and epitaxial film synthesis.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Sutormin V. S., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Polar anchoring energy and tilt angle measured by magneto-optical technique in nematic doped with ionic surfactant
Место публикации : Liq. Cryst. - 2020. - Vol. 47, Is. 12. - P.1825-1831. - ISSN 0267-8292, DOI 10.1080/02678292.2020.1733683. - ISSN 1366-5855(eISSN)
Примечания : Cited References: 32
Предметные рубрики: LIQUID-CRYSTAL
TEMPERATURE-DEPENDENCE
INTERFACE
ADSORPTION
Аннотация: The surface anchoring of a nematic doped with the ionic surfactant has been investigated and compared with the one in the undoped sample. The director tilt angle at the substrates coated with the orienting polymer film has been determined by the null method in a rotating magnetic field. The Frederiks transition in a magnetic field has been chosen as a convenient technique to measure the polar anchoring energy Wθ. The temperature dependences of anchoring energy have been obtained for the various nematic cells. The Wθ values for nematic doped with the ionic surfactant are less than for the undoped one. The factors affecting the measurement accuracy have been discussed. The accuracy is higher for the thinner nematic layers and weaker anchoring energy.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altunin R. R., Moiseenko E. T., Zharkov S. M.
Заглавие : Effect of the structural properties on the electrical resistivity of the Al/Ag thin films during the solid-state reaction
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-13-00080]
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 4. - P.708-713. - ISSN 1063-7834, DOI 10.1134/S1063783420040034. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 43. - This study was supported by the Russian Science Foundation, project no. 18-13-00080.
Предметные рубрики: LIGHT-EMITTING-DIODES
PHASE-FORMATION
AG
AL
DIFFUSION
SUPPRESSION
INTERFACE
SURFACE
GROWTH
HEAT
Аннотация: Based on the results of in situ electron diffraction study of the solid-state reaction and electrical resistivity measurements on the Al/Ag thin films with an atomic ratio of Al : Ag = 1 : 3, the temperature of the reaction onset has been established and a model of the structural phase transitions has been proposed. The solid-state reaction begins at 70°C with the formation of the Al–Ag solid solution at the interface between the aluminum and silver nanolayers. It has been found that, in the course of the reaction, the intermetallic compounds γ-Ag2Al → μ-Ag3Al are successively formed. It is shown that the possibility of the formation of the μ‑Ag3Al phase during the solid-state reaction in the Al/Ag thin films depends on the aluminum-to-silver ratio, while the formation of the μ-Ag3Al phase begins only after all fcc aluminum has reacted.
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