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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Buznik V. M., Bespalov A. S., Grashchenkov D. V.
Заглавие : Magnetic Resonance Imaging of Water Absorption by Highly Porous Ceramic Materials
Место публикации : Dokl. Chem. - 2019. - Vol. 484, Is. 2. - P.44-47. - ISSN 00125008 (ISSN), DOI 10.1134/S0012500819020058
Примечания : Cited References: 9. - The studies were performed using equipment of KRTsKP FITs "KNTs SO RAN" in the framework of the program of basic research of the Russian Academy of Sciences (project no. V.44.1.7.) regarding the development of the MRI methodology for studying composite and porous materials, and also supported by the Russian Foundation for Basic Research (project no. 16-29-05334ofi_m "Scientific foundations for creating thin-film coatings with controlled wettability") regarding the development of water-repellent porous materials.
Ключевые слова (''Своб.индексиров.''): magnetic resonance imaging--porosity--ceramic materials--hydrophobic coatings--adsorption--capillary phenomena
Аннотация: A nontrivial character of water absorption in highly porous ceramic materials has been demonstrated for the first time by magnetic resonance imaging: a phenomenon of hygroscopic memory has been detected consisting in the concentration of adsorbed water in certain areas inside the sample, repeated during subsequent wetting with water. It has been shown that hydrophobization of the material by applying fluoro paraffin coatings to oxide fibers using the method of dissolution of fluoropolymers in supercritical CO2 has a significant impact on the transport of water into products and can be considered an efficient means of protecting porous materials from moisture. The results demonstrate the capabilities of the MRI method in studying the water absorption and identifying water migration pathways in highly porous materials.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov V. V., Gudim I. A., Rautskii M. V.
Заглавие : Magnetic circular dichroism and absorption spectra of 5I8 → 5F5 transition in HoAl3(BO3)4 and HoFe3(BO3)4 single crystals
Место публикации : Phys. Lett. A. - 2019. - Vol. 383, Is. 16. - P.1960-1966. - ISSN 03759601 (ISSN), DOI 10.1016/j.physleta.2019.03.016
Примечания : Cited References: 34. - The work was supported by the Russian Foundation for Basic Researches grant 19-02-00034.
Ключевые слова (''Своб.индексиров.''): ho3+ ion--f-f transitions--magnetic circular dichroism--electron structure
Аннотация: Comparative study of magnetic circular dichroism (MCD) and absorption spectra of HoAl3(BO3)4 and HoFe3(BO3)4 single crystals in the region of 5I8 → 5F5 transition of the Ho3+ ion was carried out. Absorption spectra were decomposed into the Lorentz shape components and intensities of transitions were obtained. Unusually strong vibronic transitions were observed in HoAl3(BO3)4, but were not observed in HoFe3(BO3)4 that testified to the strong non diagonal vibronic interaction in HoAl3(BO3)4. The MCD spectra were analyzed in approximation of the ∣J,± MJ≻ of the wave functions of the free atom and using concept of the crystal quantum number. Peculiarity of application of this concept to ions with integer moments was revealed and modification of the concept was suggested. With the help of the MCD spectra, the Zeeman splitting of some transitions was found. In particular, the Landé factor gC ≈2 of the ground state of the Ho3+ ion in HoAl3(BO3)4 in the trigonal axis direction was determined. It appeared to be five times less than that in HoFe3(BO3)4 also found with the help of the MCD.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Kazak N. V., Dudnikov V. A., Temerov V. L., Gudim I. A., Knyazev Yu. V., Gavrilkin S. Yu., Dyadkin, Vadim, Dovgaliuk, Iurii, Chernyshov, Dmitry, Hen, Amir, Wilhelm, Fabrice, Rogalev, Andrei, Ovchinnikov S. G.
Заглавие : Element selective magnetism in Ho0.5Nd0.5Fe3(BO3)4 single crystal probed with hard X-ray magnetic circular dichroism
Коллективы : Russian Foundation for Basic Research [16-32-60049, 17-02-00826, 18-42-243007]; Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program)
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 479. - P.312-316. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2019.02.040. - ISSN 1873-4766(eISSN)
Примечания : Cited References: 40. - The study was supported in part by the grants of the Russian Foundation for Basic Research (project Nos. 16-32-60049, 17-02-00826, 18-42-243007) and the Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program). The magnetic measurements were carried out in the Shared Facility Centre of P.N. Lebedev Physical Institute of RAS. We are grateful to Dr. Alexey Bosak for providing assistance of the structural experiments on the ID28 beamline. We are also grateful to Dr. Evgeniy Eremin from Kirensky Institute of Physics for providing the results of magnetic measurements and for useful discussions. The authors thank the ID12 beamline staffs for help during the XMCD experiment and also gratefully acknowledge the beamtime provision (proposal HC-1804) by the ESRF.
Предметные рубрики: MICROSTRUCTURE
TRANSITIONS
ND
Ключевые слова (''Своб.индексиров.''): x-ray magnetic circular dichroism--x-ray absorption--magnetic properties
Аннотация: We present a study of a Ho0.5Nd0.5Fe3(BO3)4 single crystal aiming at understanding the roles of each magnetic sublattices in magnetic transitions at low temperatures. The crystal structure is determined to have the R32 symmetry in whole studied temperature range but the crystal appears to be racemic. Element selective magnetic properties studied with X-ray magnetic circular dichroism at the L2,3-edges of Ho and Nd, and at the Fe K-edge at T = 3 K under magnetic fields of ±17 T are compared with the results of macroscopic magnetization measurements in pure and substituted crystals. All three magnetic sublattices are shown to be strongly coupled and to undergo a spin-reorientation transition when magnetic field is applied along the trigonal c-axis. On the contrary, when magnetic field is applied in the ab-plane only the holmium atoms exhibit a sizeable magnetization jump. This result allows us to conclude that the spin-flop transitions observed in macroscopic magnetization curves and associated anomalies of electric polarization are due to the Ho3+ magnetic moment reorientation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Bikbaev R. G., Svyakhovskiy, Sergey E., Timofeev I. V., Pankin P. S., Evlashin, Stanislav A., Vetrov S. Ya., Myslivets S. A., Arkhipkin V. G.
Заглавие : Broadband Tamm plasmon polariton
Коллективы : Russian Foundation for Basic Research (RFBR) [18-32-00053]; Russian Federation [MK-2761.2019.2]
Место публикации : J. Opt. Soc. Am. B. - 2019. - Vol. 36, Is. 8. - P.2299-2305. - ISSN 0740-3224, DOI 10.1364/JOSAB.36.002299. - ISSN 1520-8540(eISSN)
Примечания : Cited References: 50. - Russian Foundation for Basic Research (RFBR) (18-32-00053); Grant of the President of the Russian Federation (MK-2761.2019.2).
Предметные рубрики: PHOTONIC CRYSTAL
OPTICAL-CONSTANTS
PERFECT ABSORBER
ABSORPTION
Аннотация: A broadband Tamm plasmon polariton localized at the interface between the Bragg mirror and a thin metallic layer has been theoretically and experimentally investigated. The possibility of a localized state formation has been demonstrated and energy coefficients at the Tamm plasmon polariton wavelength have been predicted in the framework of the coupled mode theory. The metallic layer material and thickness corresponding to the maximum coupling between the incident radiation and the Tamm plasmon polariton has been determined. Experimental reflectance and transmittance spectra of the structure consisting of the Bragg mirror and chromium layers of different thicknesses have been measured. The analysis of the energy spectra shows the existence of the wavelength range with the near-unity absorption coefficient inside the Bragg mirror bandgap. The use of chromium as a metal results in the broadband Tamm plasmon polariton excitation. It is demonstrated that the experimental data is in a good agreement with the calculation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Kretinin V. V., Masyugin A. N., Romanova O. B., Sitnikov M. N., Begisheva O. B., Galyas, A., I, Demidenko O. F., Yanushkevich, K., I
Заглавие : IR-range photoinduced diode effect in the manganese-substituted bismuth ferrite films
Коллективы : RFBR [18-52-00009 Bel_ a, 18-32-00079 mol_ a]; Belarusian Foundation [F18R-084]; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [18-42-240001 r_ a]; [3.5743.2017/6.7]
Место публикации : Semicond. Sci. Technol. - 2019. - Vol. 34, Is. 9. - Ст.095007. - ISSN 0268-1242, DOI 10.1088/1361-6641/ab3160. - ISSN 1361-6641(eISSN)
Примечания : Cited References: 45. - The reported study was funded by RFBR according to the research project No 18-52-00009 Bel_ a; No 18-32-00079 mol_ a and Belarusian Foundation project No F18R-084. The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science No 18-42-240001 r_ a, to the research project: "Inversion of the sign of the components of the magnetoelectric tensor on the temperature in films of bismuth garnet ferrite replaced by neodymium". This work is part of the research program the state order No 3.5743.2017/6.7.
Предметные рубрики: POOLE-FRENKEL CONDUCTION
BIFEO3 FILMS
LIGHT
Аннотация: The photoinduced diode effect has been found in BiMnxFe1-xO3 (0 X 0.15) films in the near-infrared and violet spectral ranges in a wide temperature interval. The dependences of the diode effect on temperature, wavelength, and illumination power have been established. The mechanism of the ferroelectric diode has been determined using its I-V characteristics at different illumination powers, optical spectra, far-infrared absorption spectra, and electric polarization hysteresis. The interplay between the photodiode effect and conductivity mechanism has been elucidated. The model of strong Coulomb potential fluctuations and quantum well asymmetry caused by the electric polarization in the film and difference between the times of carrier thermalization and recombination of electrons and holes is proposed.В пленках феррита висмута BiMnxFe1-xO3 (0 x 0.15) обнаружен фотоиндуцированный диодный эффект в ближней инфракрасной и фиолетовой областях спектра в широкой области температур. Определена зависимость диодного эффекта от температуры, длины волны, мощности освещения. Механизм ферроэлектрического диода определяется из вольт-амперных характеристик при разных интенсивностях освещения, оптических спектров и спектров поглощения в дальней ИК области, гистерезиса электрической поляризации. Устанавливается связь фотодиодного эффекта с механизмом проводимости. Предложена модель сильных флуктуаций кулоновского потенциала, асимметрия квантовых ям в результате наличия электрической поляризации в пленке и отличие времен термолизации носителей тока и рекомбинации электронов и дырок.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : da Cruz V. V., Ignatova N., Couto R. C., Fedotov D. A., Rehn D. R., Savchenko V., Norman P., Agren H., Polyutov S. P., Niskanen J., Eckert S., Jay R. M., Fondell M., Schmitt T., Pietzsch A., Fohlisch A., Gel'mukhanov F., Odelius M., Kimberg V.
Заглавие : Nuclear dynamics in resonant inelastic X-ray scattering and X-ray absorption of methanol
Коллективы : Swedish Research Council [VR 2015-04510, 2015-03781, 2015-03956, 2016-03619]; Knut and Alice Wallenberg Foundation [KAW-2013.0020]; Carl Tryggers Foundation; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [CNPq 234625/2014-7]; European Research Council under the European Union [669531 EDAX]; Helmholtz Virtual Institute "Dynamic Pathways in Multidimensional Landscapes" [VI419]; Swedish National Infrastructure for Computing [SNIC 2018/3-104, 023/07-18]; Ministry of Education and Science of the Russian Federation [3.2662.2017]
Место публикации : J. Chem. Phys. - 2019. - Vol. 150, Is. 23. - Ст.234301. - ISSN 0021-9606, DOI 10.1063/1.5092174. - ISSN 1089-7690(eISSN)
Примечания : Cited References: 80. - We acknowledge Emelie Ertan for sharing insights into performing the RASPT2 calculations. This work was supported by the Swedish Research Council (Nos. VR 2015-04510, 2015-03781, 2015-03956, and 2016-03619), the Knut and Alice Wallenberg Foundation (Grant No. KAW-2013.0020), Carl Tryggers Foundation, and within the State Contract of the Ministry of Education and Science of the Russian Federation for Siberian Federal University for Scientific Research in 2017-2019 (Project No. 3.2662.2017). V.V.C. and R.C.C. acknowledge the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (No. CNPq 234625/2014-7). A.F. acknowledges support by the European Research Council Advanced Grants 2014 Advanced Investigator Grant No. 669531 EDAX under the Horizon 2020 European Union Framework Program for Research and Innovation. M.O. acknowledges support from the Helmholtz Virtual Institute VI419 "Dynamic Pathways in Multidimensional Landscapes." Numerical simulations were performed on the resources provided by the Swedish National Infrastructure for Computing (SNIC 2018/3-104, 023/07-18). The experimental RIXS data were obtained at the ADRESS beamline of the Swiss Light Source at the Paul Scherrer Institut.
Предметные рубрики: MANY-BODY THEORY
VIBRATIONAL STRUCTURE
LIQUID METHANOL
Аннотация: We report on a combined theoretical and experimental study of core-excitation spectra of gas and liquid phase methanol as obtained with the use of X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). The electronic transitions are studied with computational methods that include strict and extended second-order algebraic diagrammatic construction [ADC(2) and ADC(2)-x], restricted active space second-order perturbation theory, and time-dependent density functional theory—providing a complete assignment of the near oxygen K-edge XAS. We show that multimode nuclear dynamics is of crucial importance for explaining the available experimental XAS and RIXS spectra. The multimode nuclear motion was considered in a recently developed “mixed representation” where dissociative states and highly excited vibrational modes are accurately treated with a time-dependent wave packet technique, while the remaining active vibrational modes are described using Franck–Condon amplitudes. Particular attention is paid to the polarization dependence of RIXS and the effects of the isotopic substitution on the RIXS profile in the case of dissociative core-excited states. Our approach predicts the splitting of the 2a″ RIXS peak to be due to an interplay between molecular and pseudo-atomic features arising in the course of transitions between dissociative core- and valence-excited states. The dynamical nature of the splitting of the 2a″ peak in RIXS of liquid methanol near pre-edge core excitation is shown. The theoretical results are in good agreement with our liquid phase measurements and gas phase experimental data available from the literature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moshkina E. M., Gudim I. A., Temerov V. L., Krylov A. S.
Заглавие : Temperature-dependent absorption lines observation in Raman spectra of SmFe3 (BO3)4 ferroborate
Коллективы : RFBR [18-02-00696, 18-02-00754]
Место публикации : J. Raman Spectrosc. - 2018. - Vol. 49, Is. 10. - P.1732-1735. - ISSN 0377-0486, DOI 10.1002/jrs.5430. - ISSN 1097-4555(eISSN)
Примечания : Cited References: 12. - RFBR, Grant/Award Numbers: 18-02-00696 and 18-02-00754
Предметные рубрики: SmFe3 (BO3)4
Ho1-xNdxFe3(BO3)4
CRYSTALS
Ключевые слова (''Своб.индексиров.''): absorption--ferroborates--huntite--level splitting--magnetic phase--transitions
Аннотация: The paper demonstrates possibilities of observation and thermal dependency study of the absorption lines as a co‐product of Raman spectroscopy study in SmFe3 (BO3)4 ferroborate. Raman spectra of the ferroborate were studied in a wide temperature range (T = 10÷300 K). Temperature‐dependent absorption lines sensitive to the magnetic phase transition have been observed in Raman spectra at two spectral ranges.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Важенина, Ирина Георгиевна, Комогорцев, Сергей Викторович, Исхаков, Рауф Садыкович, Рауцкий, Михаил Владимирович, Незнахин Д. С., Гаврилюк, Алексей Александрович, Немцев, Иван Васильевич
Заглавие : Спектр СВЧ резонансного поглощения в аморфных микропроволоках на основе кобальта
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. VIII Байкал. междунар. конф. BICMM-2018/ чл. прогр. ком. R. S. Iskhakov [et al.]. - Иркутск, 2018. - С. 170-171. - ISBN 978-5-00133-051-6
Примечания : Библиогр.: 3
РИНЦ,
Материалы конференции,
Материалы конференции,
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : One- and two-dimensional Raman-induced diffraction gratings in atomic media
Место публикации : Phys. Rev. A. - 2018. - Vol. 98, Is. 1. - Ст.013838. - ISSN 2469-9926, DOI 10.1103/PhysRevA.98.013838. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 37
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
COLD ATOMS
ABSORPTION
Аннотация: We propose and analyze an efficient scheme for the one- and two-dimensional atomic gratings based on periodic spatial modulation of the Raman gain and dispersion, which we name the Raman-induced diffraction gratings (RIDGs). There are fundamentally different from those based on electromagnetically induced transparency. As the probe field propagates along the direction normal to the standing pump wave, it can be effectively diffracted into high-order directions. The grating is a hybrid grating, i.e. it represents a mixture of amplitude and phase gratings. We identify the conditions when all high-order diffractions are amplified. In addition, we also show that diffraction of a probe field could be dynamically controlled using an additional laser field. With its help, it is possible to suppress or amplify diffraction beams. The RIDGs can be considered as all-optical multibeam splitters with amplification.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Boev N. M., Izotov A. V., Solovev P. N.
Заглавие : Study of Peculiarities of the Microwave Absorption Spectrum of Nanocrystalline Thin Magnetic Films
Коллективы : Ministry of Education and Science of the Russian Federation [RFMEFI60417X0179]
Место публикации : Russ. Phys. J. - 2019. - Vol. 61, Is. 10. - P.1798-1805. - ISSN 1064-8887, DOI 10.1007/s11182-019-01603-4. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 22. - This work was supported by the Ministry of Education and Science of the Russian Federation, project No. RFMEFI60417X0179.
Предметные рубрики: MICROMAGNETIC CALCULATION
SIMULATIONS
PARTICLES
MODES
Ключевые слова (''Своб.индексиров.''): micromagnetic modeling--nanocrystallites--random magnetic anisotropy--ferromagnetic resonance--microwave
Аннотация: Based on the micromagnetic model which takes into account the random distribution of the uniaxial magnetic anisotropy directions in crystallites of a nanocrystalline film, an effective method has been implemented for calculation of the magnetization dynamics in microwave fields. For a certain range of crystallite sizes, when the energy of the random magnetic anisotropy is comparable to the exchange energy, a significant change of the ferromagnetic resonance field, broadening of the resonance line, and the appearance of an asymmetry in the shape of the resonance curve were found. With an increase of the crystallite sizes, the resonance field first grows, then, it quickly decreases to its minimum, and then, it grows again to reach saturation. In this case, the steepness of the left slope of the broadening resonance curve first decreases faster than that of the right slope, leading to the symmetry breaking of the resonance curve shape, then, the curve becomes symmetrical again, and then, the steepness of the left slope becomes greater than that of the right slope.
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