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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kovaleva E. A., Kuzubov A. A., Avramov P. V., Kholtobina A. S., Kuklin A. V., Tomilin F. N., Sorokin P. B.
Заглавие : A key role of tensile strain and surface termination in formation and properties of La0.7Sr0.3MnO3 composites with carbon nanotubes
Место публикации : Comput. Mater. Sci.: Elsevier, 2017. - Vol. 139. - P.125-131. - ISSN 09270256 (ISSN), DOI 10.1016/j.commatsci.2017.07.021
Примечания : Cited References: 39. - This work was supported by National Research Foundation of Republic of Korea under Grant No. NRF-2017R1A2B4004440 and the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1455.2017/PCh). The authors would like to thank Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk; and Information Technology Centre, Novosibirsk State University for providing the access to their supercomputers. P.B.S gratefully acknowledges the financial supports of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (No. К2-2017-001) and RFBR, according to the research project No. 16-32-60138 mol_a_dk. E.A. Kovaleva would also like to acknowledge the program of the President of Russian Federation for Leading Scientific Schools Support (Grant No. 2016 NSh-7559.2016.2).
Ключевые слова (''Своб.индексиров.''): carbon nanotubes--lsmo--interface--spin polarization
Аннотация: Atomic and electronic structure of LSMO-based composites with carbon nanotubes were studied by means of density functional theory with respect to the termination of LSMO surface. The deformation of the tubes caused by the lattice mismatch with the substrate leads to a major change in their electronic structure. The surface terminated with Mn-O layer provides much stronger interaction with carbon nanotubes than Sr-O terminated one does. The interaction with transition metal atoms is essential for spin polarization of the nanotube while no spin injection was observed for Sr-O-supported tubes. © 2017 Elsevier B.V.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Alignment of liquid crystals by polymers with residual amounts of solvents
Коллективы : Russian Foundation for Basic Research [15-02-06924, 16-53-00073]
Место публикации : Sci. Rep. - 2017. - Vol. 7. - Ст.3042. - ISSN 2045-2322, DOI 10.1038/s41598-017-03243-5
Примечания : Cited References:21. - This work was supported by the Russian Foundation for Basic Research (project No. 15-02-06924 and No. 16-53-00073).
Предметные рубрики: DISCLINATIONS
INTERFACE
DEFECTS
Аннотация: The homogeneous nematic layers in liquid crystal cells with treated surfaces are affected by orientational transitions in the electric, magnetic, or temperature fields. The liquid crystal structures formed on solid or liquid surfaces find limited application in identifying the liquid-crystal states by the textures observed in polarized light. The use of surfaces prepared from polymer solutions makes it possible to significantly broaden the range of application of the liquid crystal structures. We investigate the structures with the continuous transformation of the nematic director orientation from radial to planar, which were formed by the polycarbonate surface in the presence of different residual solvents. The structures contained the disclination lines that aligned either by a plate rubbed to provide the homogeneous planar orientation in the LC layer or by a magnetic field applied along the polycarbonate film during the structure formation. The orientational transitions caused by surface treatment, temperature, and electric or magnetic fields in these structures are observed. The comparison of temperature critical distance as well as electric and magnetic coherence lengths with equilibrium length calculated from the expression for the free energy of the nematic is performed. The electro-optical characteristics of the nematic structures are obtained.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Varnakov S. N., Zharkov S. M., Bondarenko G. V., Weschke E., Schierle E., Ovchinnikov S. G.
Заглавие : Analysis of the structure and magnetic properties of an interface in multilayered (Fe/Si) N nanostructures with the surface-sensitive XMCD method
Коллективы : Russian Foundation for Basic Research [13-02-01265a, 14-02-31051mol-a]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh- 2886.2014.2]; Presidium of the Russian Academy of Sciences [24.34]; Ministry of Education and Science of the Russian Federation [02.G25.31.0043]
Место публикации : JETP Letters. - 2014. - Vol. 99, Is. 12. - P.706-711. - ISSN 0021-3640, DOI 10.1134/S002136401412011X. - ISSN 1090-6487
Примечания : Cited References: 26. - We are grateful to S.V. Komogortsev for stimulating discussions and to the management of BESSY II, Helmholtz-Zentrum Berlin, for the opportunity of performing experiments at the UE46-PGM1 beamline. This work was supported by the Russian Foundation for Basic Research (project nos. 13-02-01265a and 14-02-31051mol-a), by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. NSh- 2886.2014.2), by the Presidium of the Russian Academy of Sciences (program no. 24.34), and by the Ministry of Education and Science of the Russian Federation (state contract no. 02.G25.31.0043 and state task for research at Siberian Federal University in 2014).
Предметные рубрики: RAY CIRCULAR-DICHROISM
YIELD
SPECTRA
Fe
Аннотация: The structural and magnetic properties of (Fe/Si) N nanostructures obtained by successive deposition on the SiO2/Si(100) surface at a temperature of the substrate of 300 K have been studied. The thicknesses of all Fe and Si layers have been determined by transmission electron microscopy measurements. The magnetic properties have been studied by the X-ray magnetic circular dichroism (XMCD) method near the Fe L 3, 2 absorption edges. The orbital (m l ) and spin (m S ) contributions to the total magnetic moment of iron have been separated. The thicknesses of magnetic and nonmagnetic iron silicide on the Si/Fe and Fe/Si interfaces have been determined with the surface sensitivity of the XMCD method and the model of the interface between the nonmagnetic and weakened magnetic phases.
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4.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Visotin M. A., Tarasov I. A.
Заглавие : Approach for prediction of orientation relationships and interface structures and its application to α-, β-, γ-FeSi2 and Si
Коллективы : Nanostructures: Physics and Technology, International Symposium, Институт физики им. Б. И. Степанова НАН Беларуси, Санкт-Петербургский национальный исследовательский Академический университет Российской академии наук, Физико-технический институт им. А.Ф. Иоффе РАН, Научно-технологический центр микроэлектроники и субмикронных гетероструктур Российской академии наук
Место публикации : Nanostructures: Physics and Technology, International Symposium (28 ; 2020 ; 28 Sept.-2 Oct. ; Minsk, Belarus). Nanostructures: physics and technology: proc. 28th Int. symp. - 2020. - Ст.NC.13. - P.152-153. - ISBN 978-5-93634-066-6
Примечания : Cited References: 13
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5.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudakova N. V., Timofeev I. V., Bikbaev R. G., Pyatnov M. V., Vetrov S. Ya., Chen K.-P., Lee W.
Заглавие : Chiral optical Tamm state at the interface between multilayer polarization-preserving anisotropic mirror and cholesteric
Коллективы : Asian Conference on Liquid Crystals
Место публикации : The 4th Asian Conference on Liquid Crystals (ACLC 2019): abstracts. - 2019. - P.
Примечания : Библиогр.: 4
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6.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rudakova N. V., Timofeev I. V., Bikbaev R. G., Vetrov S. Ya., Lee W.
Заглавие : Chiral optical Tamm states at the interface between a cholesteric and an all-dielectric polarization-preserving anisotropic mirror
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.4-D-12
Примечания : Cited References: 3
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7.

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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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudakova N. V., Timofeev I. V., Bikbaev R. G., Pyatnov M. V., Vetrov S. Ya., Lee W.
Заглавие : Chiral optical Tamm states at the interface between an all-dielectric polarization-preserving anisotropic mirror and a cholesteric liquid crystal
Место публикации : Crystals. - 2019. - Vol. 9, Is. 10. - Ст.502. - ISSN 20734352 (ISSN), DOI 10.3390/cryst9100502
Примечания : Cited References: 48. - Russian Foundation for Basic Research (RFBR), Russia, grant No. 19-52-52006; Ministry of Science and Technology, Taiwan (MOST), grant No. 106-2923-M-009-002-MY3; M.V.P. thanks RFBR and KRSTSF for the research Project No. 18-42-243025.
Аннотация: As a new localized state of light, the chiral optical Tamm state exists at the interface between a polarization-retaining anisotropic mirror and a substance with optical activity. Considering a hybrid structure comprising a metal-free polarization-preserving mirror and a cholesteric liquid crystal, we highlight the high Q factor arising from the all-dielectric framework. The intensity of localized light decreases exponentially with increasing distance from the interface. The penetration of the field into the cholesteric liquid crystal is essentially prohibited for wavelengths lying in the photonic bandgap and close to the cholesteric pitch length. The dielectric mirror has its own photonic bandgap. The energy transfer along the interface can be effectively switched off by setting the tangential wave vector to zero. The spectral behavior of the chiral optical Tamm state is observed both as reflection and transmission resonance. This Fano resonance is analogous to the Kopp-Genack effect. Our analytics are well in line with precise calculations, which may pave a new route for the future development of intelligent design for laser and sensing applications.
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9.

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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V.
Заглавие : Diffraction of electromagnetic waves on a one-dimensional strip conductor grating located at the interface between dielectric media
Коллективы : Ministry of Education and Science of the Russian Federation [14.607.21.0039]
Место публикации : Russ. Phys. J.: Springer, 2015. - Vol. 58, Is. 5. - P.646-657. - ISSN 1064-8887, DOI 10.1007/s11182-015-0546-1. - ISSN 15739228(eISSN)
Примечания : Cited References:17. - This work was supported in part by the Ministry of Education and Science of the Russian Federation (Agreement No. 14.607.21.0039).
Предметные рубрики: TRANSMISSION COEFFICIENTS
MULTILAYER STRUCTURE
BANDPASS-FILTERS
REFLECTION
Ключевые слова (''Своб.индексиров.''): electromagnetic waves--dielectric layers--strip conductors--diffraction
Аннотация: Analytical formulas are derived for the transmission and reflection coefficients of electromagnetic E- and H-waves incident at an arbitrary angle on a one-dimensional strip conductor grating located at the interface between two dielectric media. The feasibility of adjusting the grating reflectivity within wide limits by varying its design parameters is demonstrated, which allows these structures to be used in multilayered dielectric bandpass filters.
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