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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhigalov V. S., Frolov G. I., Kveglis L. I.
Заглавие : Nanocrystalline cobalt films prepared under ultrafast condensation conditions
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 1998. - Vol. 40, Is. 11. - P1878-1883. - ISSN 1063-7834, DOI 10.1134/1.1130677
Примечания : Cited References: 12
Предметные рубрики: IRON FILMS
SUPERLATTICES
GROWTH
FE
CO
Аннотация: The magnetic and electrical properties and the temperature dependence of these properties of cobalt films prepared at high condensation rates (10(5)-10(6) Angstrom/s) are investigated. Incremented annealing reveals several nonequilibrium states of cobalt in transition from the as-prepared metastable structure to the ordinary hcp structure. The anomalies of the properties are analyzed from the standpoint of the nanocrystalline state of the samples. Model concepts of microcluster formations in the investigated films are also discussed. (C) 1998 American Institute of Physics. [S1063-7834(98)02411-3].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou G., Ren Q., Molokeev M. S., Zhou Y., Zhang J., Zhang X. -M.
Заглавие : Unraveling the ultrafast self-assembly and photoluminescence in zero-dimensional Mn2+-based halides with narrow-band green emissions
Место публикации : ACS Appl. Electron. Mater. - 2021. - Vol. 3, Is. 9. - P.4144-4150. - ISSN 26376113 (ISSN), DOI 10.1021/acsaelm.1c00606
Примечания : Cited References: 37. - This work is supported by the Natural Science Foundation of China (no. 21871167) and the 1331 project of Shanxi Province and funded by RFBR according to the research project no. 19-52-80003
Аннотация: The discovery of narrow-band luminescent materials remains an immense challenge to optimize the performance of white light-emitting diodes (LEDs). So far, the zero-dimensional (0D) Mn2+-based halides with near-unity narrow-band emissions have emerged as a class of promising phosphors in solid-state displays, but the related large-scale synthesis strategies have not been proposed and evaluated. Herein, we report an in situ synthetic process of 0D Mn2+-based halides and utilize (C20H20P)2MnBr4 as a case to investigate the photoluminescence characteristics and the structural essence of ultrafast self-assembly. The bright green emission peak at 523 nm with a full width at half maximum of 48 nm for (C20H20P)2MnBr4 is attributed to the d–d transition (4T1–6A1) of tetrahedrally coordinated [MnBr4]2– centers, and the fabricated white LED device shows a wide color gamut of 103.7% National Television System Committee (NTSC) standard. Remarkably, the experimental and theoretical results indicate that there are hydrogen bonding of C–H···Br and weak van der Waals interactions between [C20H20P]+ and [MnBr4]2–, resulting in the root for the realization of ultrafast self-assembly in 0D Mn2+-based halides. This work reveals a feasible and general synthesis method for preparing 0D Mn2+-based halides, thereby providing a possibility for their industrial application in solid-state displays.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Vyunishev A. M., Zaitsev A. I., Ikonnikov A. A., Pospelov G. I.
Заглавие : Ultrashort pulses characterization by nonlinear diffraction from virtual beam
Место публикации : Appl. Phys. Lett.: AMER INST PHYSICS, 2011. - Vol. 98, Is. 6. - Ст.61104. - ISSN 0003-6951, DOI 10.1063/1.3554370
Примечания : Cited References: 14. - The work was supported by Ministry of Education and Science of Russian Federation (Contract No. 16.740.11.0150); Grant of President of Russian Federation for support of leading scientific schools Grant No. SS-4645.2010.2; Grant No. RNP.2.1.1.3455 and Projects 2.5.2 and 3.9.1 of PSB RAS; and Projects Nos. 27.1 and 5 of SB RAS. A. M. Vyunishev is grateful for support from Carl Zeiss Grant and from Krasnoyarsk Regional Fund of Science and Technical Activity Support.
Предметные рубрики: CRYSTAL
SRB4O7
Ключевые слова (''Своб.индексиров.''): broad spectral--frequency-doubling--noncollinear--nonlinear diffraction--nonlinear photonic crystals--short-wavelength--tetraborate--ultrafast diagnostics--diffraction--light propagation--strontium--ultrashort pulses--photonic crystals
Аннотация: Noncollinear frequency doubling in a random nonlinear photonic crystal of strontium tetraborate via nonlinear diffraction from virtual beam is investigated. This effect is shown to be useful for ultrashort pulses characterization in broad spectral range. Nonlinear photonic crystals of strontium tetraborate are a promising medium for ultrafast diagnostics in short-wavelength applications. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554370]
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Ovchinnikov S. G., Nesterov A. I.
Заглавие : Ultrafast Quantum Relaxation Dynamics of Magnetically Ordered Systems with Spin Crossover in an Excited State under a Sudden Perturbation
Место публикации : JETP Letters. - 2020. - Vol. 112, Is. 4. - P.250-256. - ISSN 0021-3640, DOI 10.1134/S0021364020160109. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 27. - This work was supported by the Russian Science Foundation (project no. 18-12-00022)
Аннотация: A theoretical model based on the relaxation equation for the density matrix has been proposed to describe the ultrafast time dynamics of magnetically ordered systems with spin crossover in an excited state under a sudden perturbation. Oscillations of the magnetization, the population of the high-spin state, and the generation of local vibrons at a transition of the system from the light-excited Franck-Condon low-spin state to the highspin ground state.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Elesina V. I., Dudnik A. I., Vnukova N. G.
Заглавие : Ultrafast method of fullerenes extraction from carbon condensate
Место публикации : Fuller. Nanotub. Carbon Nanostruct. - 2019. - Vol. 27, Is. 3. - P.225-232. - ISSN 1536383X, DOI 10.1080/1536383X.2018.1543277
Примечания : Cited References: 46. - The authors are grateful to Alexey Popov (Leibniz Institute for Solid State and Materials Research, Dresden, German) for his contribution in conducting mass spectrometer studies.
Ключевые слова (''Своб.индексиров.''): solution extraction--mechanical extraction--fullerenes--soxhlet
Аннотация: The Soxhlet extraction method (SE) only used in the extraction of fullerenes from carbon condensate (CC) obtained in the fullerene production facility, which in the literature is often referred to as carbon black, does not provide complete extraction. Fullerenes can also be extracted from the CC suspension and the solvent by the mechanical extraction method (ME) and show higher degree of extraction efficiency. This method combined with filtration process takes only a few minutes and allows a significant reduction in solvent consumption. Extraction via the ME method application makes it possible to carry out extraction of fullerenes twenty times faster than by the SE method. It can be used as an independent method, bypassing the extraction by the SE method, and also as an additional one. Application of the ME method allows additional extraction of fullerenes weight percentage from the CC, after extracting fullerenes from it applying the SE method. In this instance the higher fullerenes prevail in the essences extracted by the ME method with their content reaching as high as 39.50 wt%. The obtained samples of fullerene mixtures (FM) are characterized by the methods of high-performance liquid chromatography and mass spectrometry. Analysis of the results shows that the composition of the FM, isolated by the ME method, differs from the compositions extracted via the ME method.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Sheremet’eva Y. A., Nasedkin B. A., Baturin I. S., Akhmatkhanov A. R., Shur V. Y.
Заглавие : Second harmonic generation of femtosecond laser pulses under Raman-Nath nonlinear diffraction
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2015. - Vol. 79, Is. 2. - P.190-193. - ISSN 1062-8738, DOI 10.3103/S106287381502032X
Примечания : Cited References: 8. - This work was supported by the Grant of the President of the Russian Federation MK-250.2013.2; by RFBR Grant No 15-02-03838; Krasnoyarsk Regional Fund for Science and Technical Activity Support; and by the Russian Academy of Sciences, Project no. 24.31. A.R. Akhmatkhanov is grateful for the support given to young scientists under the Developmental Program of the Ural Federal University.
Ключевые слова (''Своб.индексиров.''): diffraction--harmonic analysis--laser pulses--nonlinear optics--pulse generators--ultrafast lasers--ultrashort pulses--angular characteristics--cherenkov--lithium niobate--nonlinear diffraction--periodic domain structures--theoretical modeling--harmonic generation
Аннотация: The second harmonic generation of femtosecond laser pulses under Raman-Nath nonlinear diffraction in periodic domain structures of lithium niobate is considered. A theoretical model of Cherenkov nonlinear diffraction is used to calculate the spectral-angular characteristics of the second harmonic generation of femtosecond laser pulses under Raman-Nath nonlinear diffraction. Reliability of the results is confirmed by the experimental data. © 2015, Allerton Press, Inc.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sandalov I. S.
Заглавие : Theories of ultrafast demagnetization: where we are?
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.I7.5. - P.335. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Ключевые слова (''Своб.индексиров.''): ultrafast--demagnetization--non-equilibrium--exchange interaction
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaylovskiy, R., V, Huisman T. J., Gavrichkov V. A., Polukeev S. I., Ovchinnikov S. G., Afanasiev D., Pisarev, R., V, Rasing, T.h., Kimel, A., V
Заглавие : Resonant Pumping of d-d Crystal Field Electronic Transitions as a Mechanism of Ultrafast Optical Control of the Exchange Interactions in Iron Oxides
Место публикации : Phys. Rev. Lett. - 2020. - Vol. 125, Is. 15. - Ст.157201. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.125.157201. - ISSN 1079-7114(eISSN)
Примечания : Cited References: 46. - We thank A. Toonen and S. Semin for technical assistance. The work at Radboud University was supported by de Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) and the European Research Council ERC Grant Agreement No. 339813 (Exchange). R. V. M. thanks ERC, Grant Agreement No. 852050 (MAGSHAKE). V. A. G., S. I. P., and S. G. O. are thankful to the Russian Science Foundation for the financial support under the Grant No. 18-12-00022. The theoretical part of this research was performed by V. A. G., S. I. P., and S. G. O. under the RSF Grant No. 18-12-00022. The contribution of R. V. P. into the experimental part was supported by the RSF Grant No. 16-12-10456
Предметные рубрики: BORATE
Аннотация: The microscopic origin of ultrafast modification of the ratio between the symmetric (J) and antisymmetric (D) exchange interaction in antiferromagnetic iron oxides is revealed, using femtosecond laser excitation as a pump and terahertz emission spectroscopy as a probe. By tuning the photon energy of the laser pump pulse we show that the effect of light on the D/J ratio in two archetypical iron oxides FeBO3 and ErFeO3 is maximized when the photon energy is in resonance with a spin and parity forbidden d-d transition between the crystal-field split states of Fe3+ ions. The experimental findings are supported by a multielectron model, which accounts for the resonant absorption of photons by Fe3+ ions. Our results reveal the importance of the parity and spin-change forbidden, and therefore often underestimated, d-d transitions in ultrafast optical control of magnetism.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A.S., Vyunishev A.M., Zaitsev A.I., Slabko V.V.
Заглавие : Random quasi-phase-matched conversion of broadband radiation in a nonlinear photonic crystal
Место публикации : Phys. Rev. A. - 2010. - Vol. 82, Is. 5. - ISSN 1050-2947, DOI 10.1103/PhysRevA.82.055806
Примечания : Cited Reference Count: 22. - Гранты: The work was supported by the Ministry of Education and Science of the Russian Federation (Contract 16.740.11.0150), Grant of the President of the Russian Federation for the support of leading scientific schools No. SS-4645.2010.2, Grant No. RNP.2.1.1.3455, Projects 2.5.2 and 3.9.1 of PSB RAS, and Projects No. 27.1 and No. 5 of SB RAS. A. M. Vyunishev is grateful for the support from Krasnoyarsk Regional Fund of Science and Technical Activity Support.Финансирующая организация: Ministry of Education and Science of the Russian Federation [16.740.11.0150]; Russian Federation for the support of leading scientific schools [SS-4645.2010.2, RNP.2.1.1.3455]; PSB RAS [2.5.2, 3.9.1]; SB RAS [27.1, 5]; Krasnoyarsk Regional Fund of Science and Technical Activity
Ключевые слова (''Своб.индексиров.''): broad spectrum--broadband radiation--femtosecond laser pulse--fundamental wave--nonlinear generation--nonlinear photonic crystals--quasi-phase-matched--quasi-phase-matched frequency doubling--red shift--shorter wavelength--tetraborate--tuning ranges--vacuum ultraviolets--band structure--crystal structure--strontium--ultrafast lasers--ultrashort pulses--photonic crystals
Аннотация: Radiation in the range 187.5-215 nm was generated via random quasi-phase-matched frequency doubling of femtosecond laser pulses in nonlinear photonic crystals of strontium tetraborate. Abroad spectrum of fundamental radiation favors the probing of the nonlinear photonic crystal band structure. The red shift of the band structure upon the fundamental wave-vector rotation was observed. No principal limitations of the tuning range at its shorter wavelength boundary from the nonlinear photonic crystal (NPC) material are found. Calculation shows that the NPC structure enables enhancement of nonlinear generation in the vacuum ultraviolet.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Kimel A.
Заглавие : Different physical mechanism of the UFM in ferromagnets with itinerant and localized electrons
Коллективы : Ultrafast Magnetism Conference
Место публикации : Ultrafast Magnetism Conference (UMC2015). - 2015
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