Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N.
Заглавие : Light guiding above the light line in arrays of dielectric nanospheres
Место публикации : Opt. Lett.: Optical Society of America, 2016. - Vol. 41, Is. 16. - P.3888-3891. - ISSN 01469592 (ISSN), DOI 10.1364/OL.41.003888
Примечания : Cited References: 46. - Russian Foundation for Basic Research (RFBR) (16-02-00314).
Предметные рубрики: SUBWAVELENGTH WAVE-GUIDES
OPTICAL MODES
NANOPARTICLES
CHAINS
RESONANCES
PARTICLES
SPHERES
Аннотация: We consider light propagation above the light line in arrays of spherical dielectric nanoparticles. It is demonstrated numerically that quasi-bound leaky modes of the array can propagate both stationary waves and light pulses to a distance of 60 wavelengths at the frequencies close to the bound states in the radiation continuum. A semi-analytical estimate for decay rates of the guided waves is found to match the numerical data to a good accuracy. © 2016 Optical Society of America.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F., Sherman, E. Ya.
Заглавие : Temporal oscillations of light transmission through dielectric microparticles subjected to optically induced motion
Коллективы : Russian Science Foundation [14-12-00266]; University of the Basque Country UPV/EHU (MINECO/FEDER) [UFI 11/55, FIS2015-67161-P]; Grupos Consolidados UPV/EHU del Gobierno Vasco [IT-472-10]
Место публикации : Phys. Rev. A: American Physical Society, 2016. - Vol. 94, Is. 3. - Ст.033820. - ISSN 2469-9926, DOI 10.1103/PhysRevA.94.033820. - ISSN 2469-9934(eISSN)
Примечания : Cited References:37. - The work of A.F.S. was partially supported by Grant No. 14-12-00266 from the Russian Science Foundation. This work of E.Y.S. was supported by the University of the Basque Country UPV/EHU under Program No. UFI 11/55, FIS2015-67161-P (MINECO/FEDER), and Grupos Consolidados UPV/EHU del Gobierno Vasco (Grant No. IT-472-10).
Предметные рубрики: FOCUSED LASER-BEAM
CAVITY OPTOMECHANICS
BACK-ACTION
FORCES
NANOPARTICLES
MANIPULATION
PARTICLES
TRAP
Аннотация: We consider light-induced binding and motion of dielectric microparticles in an optical waveguide that gives rise to a backaction effect such as light transmission oscillating with time. Modeling the particles by dielectric slabs allows us to solve the problem analytically and obtain a rich variety of dynamical regimes both for Newtonian and damped motion. This variety is clearly reflected in temporal oscillations of the light transmission. The characteristic frequencies of the oscillations are within the ultrasound range of the order of 105 kHz for micron-size particles and injected power of the order of 100mW. In addition, we consider dynamics of a dielectric particle, driven by light propagating inside a Fabry-Perot resonator. These phenomena pave a way for optical driving and monitoring of the motion of particles in waveguides and resonators.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Kuzubov A. A., Kholtobina A. S., Kovaleva E. A., Knaup J., Irle S.
Заглавие : Theoretical investigation of molecular and electronic structures of buckminsterfullerene-silicon quantum dot systems
Место публикации : J. Phys. Chem. A: American Chemical Society, 2016. - Vol. 120, Is. 49. - P.9767-9775. - ISSN 1089-5639, DOI 10.1021/acs.jpca.6b06959
Примечания : Cited References:20. - The work was supported by Ministry of Education and Science of Russia (Russian-Japanese joined project, Agreement 14.613.21.0010, ID RFMEFI61314X0010). We are grateful to the Joint Supercomputer Center of Russian Academy of Sciences, Moscow and Siberian Supercomputer Center of SB RAS, Novosibirsk for the opportunity to use their computer clusters to perform the calculations. S.I. acknowledges partial support from a JST CREST grant.
Предметные рубрики: Si
NANOPARTICLES
DYNAMICS
Аннотация: Density functional theory (DFT) and density functional tight binding (DFTB) molecular dynamics Density functional theory (DFT) and density functional tight binding (DFTB) molecular dynamics (DFTB/MD) simulations of embedding and relaxation of buckminsterfullerene C60 molecules chemisorbed on (001) and (111) surfaces and inside bulk silicon lattice were performed. DFT calculations of chemisorbed fullerenes on both surfaces show that the C60 molecule deformation was very small and the C60 binding energies were roughly ∼4 eV. The charge analysis shows that the C60 molecule charges on (001) and (111) surfaces were between −2 and −3.5 electrons, respectively, that correlates well with the number of C–Si bonds linking the fullerene molecule and the silicon surface. DFT calculations of the C60 molecule inside bulk silicon confirm that the C60 molecule remains stable with the deformation energy values of between 11 and 15 eV for geometries with different C60 configurations. The formation of some C–Si bonds causes local silicon amorphization and corresponding electronic charge uptake on the embedded fullerene cages. Charge analysis confirms that a single C60 molecule can accept up to 20 excessive electrons that can be used in practice, wherein the main charge contribution is located on the fullerene’s carbon atoms bonded to silicon atoms. These DFT calculations correlate well with DFTB/MD simulations of the embedding process. In this process, the C60 molecule was placed on the top of the Si(111) surface, and it was further exposed by a stream of silicon dimers, resulting in subsequent overgrowth by silicon.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Zhigalov V. S., Bykova L. E., Solov'ev L. A., Bondarenko G. N.
Заглавие : Solid-phase synthesis of L1(0)-FePd(001) epitaxial thin films: Structural transformations and magnetic anisotropy
Коллективы :
Разночтения заглавия :авие SCOPUS: Solid-phase synthesis of L10-FePd(001) epitaxial thin films: Structural transformations and magnetic anisotropy
Место публикации : JETP Letters. - 2010. - Vol. 91, Is. 9. - P.481-485. - ISSN 0021-3640, DOI 10.1134/S0021364010090109
Примечания : Cited References: 24. - This work was supported by the Ministry of Education and Science of the Russian Federation (project no. 2.1.1/4399, program "Development of the Scientific Potential of Higher Education (2009-2010)").
Предметные рубрики: NANOPARTICLES
COERCIVITY
TRANSITION
Аннотация: The solid-phase synthesis of the L1(0)-FePd magnetically hard phase in Fe(001)/Pd(001) epitaxial films has been experimentally investigated. The formation of three types of L1(0)-FePd ordered crystallites whose c axes coincide with the aOE (c) 100 directions of the MgO(001) substrate begins at the Fe/Pd interface at a temperature of 450A degrees C. After an increase in the annealing temperature to 500A degrees C, structural rearrangement occurs and gives rise to the predominant growth of L1(0)-FePd crystallites with the c axis perpendicular to the film plane. After 10-h annealing, the fraction of such crystallites becomes dominant, leading to large perpendicular anisotropy. The first magnetocrystalline-anisotropy constant of the L1(0)-FePd phase has been determined and the second constant has been estimated. It has been shown that magnetic anisotropy in the L1(0)-FePd(001) basal plane cannot be described by the biaxial anisotropy of the tetragonal crystal. The annealing above 500A degrees C results in the evolution of L1(0)-FePd to a disordered cubic phase.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Raikher Y. L., Stepanov V. I., Stolyar S. V., Ladygina V. P., Balaev D. A., Ishchenko L. A., Balasoiu M.
Заглавие : Magnetic properties of biomineral particles produced by bacteria Klebsiella oxytoca
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 2. - P298-305. - ISSN 1063-7834, DOI 10.1134/S1063783410020125
Примечания : Cited References: 29. - This study was supported by the Russian Foundation for Basic Research (project nos. 07-02-96026, 07- 02-96017, and 08-02-00802) and performed within the framework of the Federal Target Program "Research and Research-Pedagogical Personnel of Innovation Russia for 2009-2013."
Предметные рубрики: FERRITIN
NANOPARTICLES
IRON
SUSCEPTIBILITY
FERRIHYDRITE
BEHAVIOR
FINS
Аннотация: Ferrihydrite nanoparticles (2-5 nm in size) produced by bacteria Klebsiella oxytoca in the course of biomineralization of iron salt solutions from a natural medium exhibit unique magnetic properties: they are characterized by both the antiferromagnetic order inherent in a bulk ferrihydrite and the spontaneous magnetic moment due to the decompensation of spins in sublattices of a nanoparticle. The magnetic susceptibility enhanced by the superantiferromagnetism effect and the magnetic moment independent of the magnetic field provide the possibility of magnetically controlling these natural objects. This has opened up the possibilities for their use in nanomedicine and bioengineering. The results obtained from measurements of the magnetic properties of the ferrihydrite produced by Klebsiella oxytoca in its two main crystalline modifications are reported, and the data obtained are analyzed theoretically. This has made it possible to determine numerical values of the magnetic parameters of real biomineral nanoparticles.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karpov S. V., Gerasimov V. S., Isaev I. L., Markel V. A.
Заглавие : Spectroscopic studies of fractal aggregates of silver nanospheres undergoing local restructuring
Место публикации : J. Chem. Phys.: AMER INST PHYSICS, 2006. - Vol. 125, Is. 11. - Ст.111101. - ISSN 0021-9606, DOI 10.1063/1.2229202
Примечания : Cited References: 30
Предметные рубрики: ENHANCED RAMAN-SCATTERING
SMALL-PARTICLE COMPOSITES
OPTICAL-PROPERTIES
DISORDERED CLUSTERS
NONLINEAR OPTICS
LOCALIZATION
NANOPARTICLES
EIGENMODES
BOUNDS
Ключевые слова (''Своб.индексиров.''): large-scale fractal geometry--nonlinear optical responses--restructuring--silver nanospheres--aggregates--colloids--electromagnetic fields--fractals--nonlinear optics--sampling--spectroscopic analysis--silver
Аннотация: We present an experimental spectroscopic study of large random colloidal aggregates of silver nanoparticles undergoing local restructuring. We argue that such well-known phenomena as strong fluctuation of local electromagnetic fields, appearance of "hot spots" and enhancement of nonlinear optical responses depend on the local structure on the scales of several nanosphere diameters, rather than the large-scale fractal geometry of the sample. (c) 2006 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Isakova V. G., Osipova I. V., Dudnik A. I., Cherepakhin A. V., Zharikova N. V., Nemtsev I. V., Volochaev M. N.
Заглавие : Decoration of carbon nanomaterial powders with dispersed platinum metal particles
Коллективы : Center for Shared Use of the Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences
Место публикации : Russ. J. Appl. Chem. - 2018. - Vol. 91, Is. 7. - P.1209-1216. - ISSN 1070-4272, DOI 10.1134/S1070427218070212. - ISSN 1608-3296(eISSN)
Примечания : Cited References: 22. - The study was performed with the support and equipment of the Center for Shared Use of the Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences.
Предметные рубрики: NANOPARTICLES
PALLADIUM
FULLERENE
ELECTRODE
NANOTUBES
OXIDATION
Ключевые слова (''Своб.индексиров.''): carbon nanomaterials--platinum metal nanoparticles--in situ one-step method
Аннотация: Carbon nanomaterials (fullerite, detonation nanodiamonds, Taunit, fullerenol, fullerene-containing black) were decorated with platinum group metal nanoparticles in situ in one step by low-temperature combustion (~250–270°С) of a powdered mixture of platinum metal acetylacetonate [Pt-M(асас)n, Pt-М = Pt(II), Pd(II), Rh(III), Ir(III), acac = CH3COCHCOCH3, n is the oxidation state of Pt-М] with carbon nanomaterials in air. As shown by thermal analysis, the process is based on thermal oxidative degradation of the organometallic complex, catalyzed by carbon nanomaterials, with oxidation (combustion) of the organic moiety and release of the metal into the condensed phase. The thermal process in an open system occurs in the glowing mode (210–250°С); the size of the nanoparticles formed is 7–30 nm. Under the conditions restricting the air access to the reaction mixture and free outflow of gaseous products formed by oxidation of acac ligands, the nanoparticle size decreases to 3–10 nm. The particle size depends on the metal amount in the initial powder mixture and on the support morphology.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dubrovskiy A. A., Semenov S. V., Knyazev Yu. V., Popkov S. I., Yakushkin S., Kirillov V., Martyanov O., Balaev D. A.
Заглавие : The Low-Temperature Magnetic State and Magnetic Ordering Temperature of ϵ-Fe2O3 Iron Oxide Nanoparticles
Место публикации : IEEE Magn. Lett. - 2019. - Vol. 10. - Ст.6110103. - ISSN 1949307X (ISSN), DOI 10.1109/LMAG.2019.2956674
Примечания : Cited References: 22
Предметные рубрики: Magnetic resonance
Magnetic hysteresis
Temperature distribution
Saturation magnetization
Nanoparticles
Perpendicular magnetic anisotropy
Аннотация: The ϵ-Fe2O3 iron oxide polymorph is a well-known magnetic material with a complex magnetic structure, which undergoes a series of magnetic transitions in different temperature ranges. However, the ϵ-Fe2O3 phase diagram is still unclear. We report on the magnetic properties of a sample consisting of ϵ-Fe2O3 nanoparticles with an average size of 8 nm embedded in a SiO2 xerogel matrix without an admixture of foreign phases. Along with the features typical of the well-known ϵ-Fe2O3 magnetic transition in the temperature range 80–150 K, the temperature dependence of magnetization M(T) of ϵ-Fe2O3 includes other low-temperature anomalies. In an external field of H = 70 kOe, there is a noticeable temperature hysteresis of magnetization at 50–90 K, and near T ≈ 50 K, the M(T) curves have a characteristic bending, which may be indicative of an additional magnetic transition. The ferromagnetic resonance spectra shows that, near 500 K, a magnetic phase transition occurs, which was previously thought to be a transition to the paramagnetic state. An analysis of the temperature dependence of the ferromagnetic resonance spectra shows that the magnetically ordered phase in ϵ-Fe2O3 exists up to about 800 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moseenkov S. I., Kuznetsov V. L., Zavorin A. V., Golubtsov G. V., Korovin, E. Yu., Suslyaev V. I., Ishchenko A. V., Serkova A. N., Sergeenko D. I., Velikanov D. A.
Заглавие : Electrophysical properties of composites based on polyethylene modified with multi-walled carbon nanotubes with high content of Fe-Co-catalyst
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [17-73-20293]
Место публикации : Russ. J. Appl. Chem. - 2020. - Vol. 93, Is. 4. - P.586-594. - ISSN 1070-4272, DOI 10.1134/S107042722004014X. - ISSN 1608-3296(eISSN)
Примечания : Cited References: 30. - This work was financially supported by the Russian Science Foundation, project no. 17-73-20293.
Предметные рубрики: POLYMER COMPOSITES
NANOPARTICLES
ACTIVATION
NANOCOMPOSITES
Аннотация: The effect of the residual catalyst for the synthesis of multi-walled carbon nanotubes (MWCNTs) on the electrophysical properties of MWCNT-polyethylene composites produced by melt mechanical mixing was studied. The residual catalyst content was varied by changing the MWCNTs synthesis time. The nanotubes used in the work were characterized using transmission and scanning electron microscopy, atomic emission analysis, X-ray phase analysis, and magnetic permeability measurements. The structure of the synthesized composites was studied using optical and scanning electron microscopy. The dependences of the specific magnetization on the applied magnetic field, bulk electrical conductivity on the volumetric content of the filler in the composite, and the frequency dependences of the reflection, transmission, and absorption of electromagnetic radiation in the range 0.01-18 GHz were obtained. It was established that the obtained composites are characterized by a uniform distribution of nanotubes in the polymer matrix, and the dependence of the bulk electrical conductivity on the content of MWCNTs in the composite has a percolation character. Variation in the synthesis time of nanotubes allows producing MWCNTs with a high content of ferromagnetic particles, which are an alloy close in stoichiometry to the composition of the active component of the catalyst. It was shown that the use of composites modified with MWCNTs with a high content of residual catalyst is more effective for absorbing electromagnetic radiation due to an increase in their magnetic losses.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhigalov V. S., Myagkov V. G., Bykova L. E., Bondarenko G. N., Velikanov D. A., Volochaev M. N.
Заглавие : Rotational magnetic anisotropy in polycrystalline FePt films fabricated by solid-state synthesis
Коллективы : Russian Foundation for Basic Research [16-03-00069, 15-02-00948]; Government of the Russian Federation; Krasnoyarsk Territorial Foundation for Support of Scientific and RD Activity [16-42-243006]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 1. - P.178-182. - ISSN 1063-7834, DOI 10.1134/S1063783418010298. - ISSN 1090-6460(eISSN)
Примечания : Cited References:24. - This study was supported by the Russian Foundation for Basic Research, projects nos. 16-03-00069 and 15-02-00948 and supported in part by the Government of the Russian Federation and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 16-42-243006.
Предметные рубрики: THIN-FILMS
ROTATABLE ANISOTROPY
NANOPARTICLES
COPT
TEMPERATURE
Аннотация: It is shown that annealing 550°C of the Fe/Pt bilayer films fabricated by layer-by-layer deposition onto polycrystalline Al2O3 substrates in an atomic ratio of Fe: Pt = 71: 29 leads to the formation of the inplane rotational magnetic anisotropy with the easy axis that can be aligned by magnetic field in any direction in the film plane. The increase in the Pt content in the investigated film system to 50 at % leads to an increase in the anisotropy constant to 6.5 × 106 erg/cm3, which exceeds the value in the Fe71Pt29 sample by a factor of 6. In addition to the rotational anisotropy, the Fe50Pt50 films are characterized by the perpendicular rotational magnetic anisotropy, which is higher than the film shape anisotropy. Therefore, the easy axis in these samples can be aligned by magnetic field in any spatial direction. According to the X-ray and magnetic measurement data, the synthesized samples have a polycrystalline structure consisting of two ordered phases: magnetically hard L10–FePt and magnetically soft L12–Fe3Pt. This gives us grounds to suggest that the rotational magnetic anisotropy originates from the epitaxial intergrowth and exchange coupling of these two phases.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smolyarova T. E., Lukyanenko A. V., Tarasov A. S., Sokolov A. Е.
Заглавие : Dip-Pen Nanolithography method for fabrication of biofunctionalized magnetic nanodiscs applied in medicine
Коллективы : International Symposium on Nanostructures - Physics and Technology , Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [17-42-240080, 16-42-243046, 16-42-242036]; Russian Federation [NSh-7559.2016.2]
Место публикации : Semiconductors. - 2018. - Vol. 52: 25th International Symposium on Nanostructures - Physics and Technology (Jun 26-30, 2017, Saint Petersburg, Russia), Is. 5. - P.675-677. - ISSN 1063-7826, DOI 10.1134/S1063782618050305. - ISSN 1090-6479(eISSN)
Примечания : Cited References:22. - The study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project nos. 17-42-240080, 16-42-243046, 16-42-242036 and the Grant of the President of the Russian Federation no. NSh-7559.2016.2.
Предметные рубрики: DRUG-DELIVERY
FORCE MICROSCOPY
NANOPARTICLES
HYPERTHERMIA
THERAPY
Аннотация: The magnetic properties of ferromagnetic nanodiscs coated with gold, manufactured using the Dip-Pen Nanolithography method, and were studied by atomic-force and magnetic force microscopy methods. The magnetic discs (dots) are represented as nanoagents (nanorobots) applied in medicine for the cancer cell destruction. The motivation of this work stem from the necessity of the understanding of the magnetization distribution in ferromagnetic discs that is crucial for their application in biomedicine. We have performed the theoretical calculations in order to compare the theoretical image contrast to experimental results. Herein, we report about the fabrication and analysis of biocompatible ferromagnetic nanodiscs with the homogenous magnetized state.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Roginskii E. M., Krylov A. S., Ershov A. A., Voronov V. N.
Заглавие : Structural, electronic and vibrational properties of LaF3 according to density functional theory and Raman spectroscopy
Коллективы : RFBR [17-52-53031, 16-02-00102]; Ministry of Education and Science of the Russian Federation; Krasnoyarsky regional fund of scientific support and scientific-technical activity
Место публикации : J. Phys.: Condens. Matter. - 2018. - Vol. 30, Is. 25. - Ст.255901. - ISSN 0953-8984, DOI 10.1088/1361-648X/aac452. - ISSN 1361-648X(eISSN)
Примечания : Cited References: 39. - The reported study was funded by RFBR according to the research project No. 17-52-53031 and 16-02-00102. It was partially supported by the Ministry of Education and Science of the Russian Federation and the 'Krasnoyarsky regional fund of scientific support and scientific-technical activity'. The computations were performed using facilities of the Computational Centre of the Research Park of St. Petersburg State University.
Предметные рубрики: CRYSTAL-STRUCTURE
NEUTRON-DIFFRACTION
NANOPARTICLES
CONDUCTIVITY
Ключевые слова (''Своб.индексиров.''): laf3--tysonite structure--dft--electronic structure--lattice vibrations--raman spectroscopy
Аннотация: Crystal structure of LaF3 single crystal is refined in tysonite-type trigonal unit cell P c1 using density functional theory calculations and Raman spectroscopy. It is shown that trigonal structure with P c1 space group is more energy-efficient than hexagonal structure with space group P63 cm. Simulated Raman spectra obtained using LDA approximation is in much better agreement with experimental data than that obtained with PBE and PBEsol functionals of GGA. The calculated frequency value of silent mode B 2 in case of hexagonal structure P63 cm was found to be imaginary (unstable mode), thus the energy surface obtains negative curvature with respect to the corresponding normal coordinates of the mode which leads to instability of the hexagonal structure in harmonic approximation. The A 1g line at 214 cm−1 in Raman spectra of LaF3 related to the translation of F2 ions along c axis can be connected with F2 ionic conductivity.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Izotov A. V., Leksikov An. A.
Заглавие : Micromagnetic calculation of the equilibrium distribution of magnetic moments in thin films
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 8. - P1664-1672. - ISSN 1063-7834, DOI 10.1134/S1063783410080160
Примечания : Cited References: 17. - This study was supported by the Council on Grants from the President of the Russian Federation (grant no. 3818.2008.3), the Siberian Branch of the Russian Academy of Sciences (integration project no. 5), the Presidium of the Russian Academy of Sciences (project no. 27.1), and the Ministry of Education and Science of the Russian federation (state contract nos. 02.740.11.0220 and 02.740.11.0568.
Предметные рубрики: SIMULATIONS
ANISOTROPY
NANOPARTICLES
MODES
Аннотация: A new approach has been proposed for determining an equilibrium configuration of magnetic moments in condensed matter in terms of its discrete model. The solution to this problem is reduced to a system of linear inhomogeneous equations with undetermined Lagrange multipliers. The possibility of numerically solving these systems has been shown using a modified power method. The efficiency of the method has been demonstrated for the model of a thin magnetic film with a nonuniform distribution of the uniaxial magnetic anisotropy over the area. The dependence of the coercive force on the uniaxial anisotropy of nanocrystallites, their exchange interaction, and other parameters of samples has been investigated.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Poperechny I. S., Krasikov A. A., Shaikhutdinov K. A., Dubrovskiy A. A., Popkov S. I., Balaev A. D., Yakushkin S. S., Bukhtiyarova G. A., Martyanov O. N., Raikher, Yu. L.
Заглавие : Dynamic magnetization of ε-Fe2O3 in pulse field: Evidence of surface effect
Место публикации : J. Appl. Phys.: American Institute of Physics, 2015. - Vol. 117, Is. 6. - Ст.063908. - ISSN 0021, DOI 10.1063/1.4907586. - ISSN 10897550(eISSN)
Примечания : Cited References:30. - The work was supported by RFBR Grant Nos. 14-02-96002 and 12-02-00897, and project MIG S26/617 from the Ministry of Education and Science of Perm Region.
Предметные рубрики: FERROMAGNETIC-RESONANCE
COERCIVE FIELD
NANOPARTICLES
ANISOTROPY
Аннотация: The magnetization dynamics of ε-Fe2O3 nanoparticles with an average size of about 9 nm is investigated. From comparison of the hysteresis loops obtained in quasi-static conditions and under pulse fields with amplitudes up to 200 kOe and pulse lengths 8–32 ms, it follows that the effective coercivity increases considerably with the variation rate of the imposed magnetic field. A theoretical explanation of this behavior is proposed. The model takes into account the superparamagnetic effects as well as the fact that magnetic anisotropy of the nanoparticles, along with the bulk term, includes a surface contribution. The latter, being of minor importance for the observed magnetic behavior of 25–100 nm particles, becomes essential when the particle size is below 10 nm. From the experimental data, a reference value of the surface anisotropy of nanodisperse ε-Fe2O3 is established, and evidence is presented to the effect that below 300 K this contribution does not significantly depend on temperature.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Chengyin, Xia, Zhiguo, Molokeev M. S., Liu, Quanlin
Заглавие : Synthesis, crystal structure, and enhanced luminescence of garnet-type Ca3Ga2Ge3O12:Cr3+ by codoping Bi3+
Место публикации : J. Am. Ceram. Soc.: Wiley-Blackwell, 2015. - Vol. 98, Is. 6. - P.1870-1876. - ISSN 0002, DOI 10.1111/jace.13553. - ISSN 15512916(eISSN)
Примечания : Cited References:24. - This work was supported by the National Natural Science Foundations of China (grant nos. 51002146, 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047), Beijing Youth Excellent Talent Program (YETP0635), the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306) and Fundamental Research Funds for the Central Universities (FRF-TP-14-005A1).
Предметные рубрики: LIGHT-EMITTING-DIODES
INFRARED PERSISTENT LUMINESCENCE
ENERGY-TRANSFER
PHOSPHOR
RED
NANOPARTICLES
EFFICIENCY
Аннотация: Garnet-type compound Ca3Ga2Ge3O12 and Cr3+-doped or Cr3+/Bi3+ codped Ca3Ga2Ge3O12 phosphors were prepared by a solid-state reaction. The crystal structure of Ca3Ga2Ge3O12 host was studied by X-ray diffraction (XRD) analysis and further determined by the Rietveld refinement. Near-infrared (NIR) photoluminescence (PL) and long-lasting phosphorescence (LLP) emission can be observed from the Cr3+-doped Ca3Ga2Ge3O12 sample, and the enhanced NIR PL emission intensity and LLP decay time can be realized in Cr3+/Bi3+ codped samples. The optimum concentration of Cr3+ in Ca3Ga2Ge3O12 phosphor was about 6 mol%, and optimum Bi3+ concentration induced the energy-transfer (ET) process between Bi3+ and Cr3+ ions was about 30 mol%. Under different excitation wavelength from 280 to 453 nm, all the samples exhibit a broadband emission peaking at 739 nm and the intensity of NIR emission increases owing to the ET behavior from Bi3+ to Cr3+ ions. The critical ET distance has been calculated by the concentration-quenching method. The thermally stable luminescence properties were also studied and the introduction of Bi3+ can also improve the thermal stability of the NIR emission.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Zimin A. A., Filatov E. Y., Korenev S. V., Shubin Yu. V., Chizhik N. A., Yurkin G. Yu., Eremin E. V.
Заглавие : The exchange interaction effects on magnetic properties of the nanostructured CoPt particles
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 401. - P.236-241. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2015.10.041
Примечания : Cited References: 55. - The work has been partially supported by RFBR Grants 15-08-06673, 14-03-00411, 14-03-00129, 15-42-0417115 and it is partly performed in Siberian Federal University within the state contract of the Russian Federation Ministry of Education and Science for 2014-2016 (project number 1792)
Предметные рубрики: CLUSTER BEAM DEPOSITION
BULK MAGNETS
NANOCRYSTALLINE FERROMAGNETS
REMANENCE ENHANCEMENT
THIN-FILMS
COERCIVITY
MICROSTRUCTURE
NANOPARTICLES
IRON
SYSTEM
Аннотация: Various manifestations of the exchange interaction effects in magnetization curves of the CoPt nanostructured particles are demonstrated and discussed. The inter-grain exchange constant A in the sponge-like agglomerates of crystallites is estimated as A=(7±1) pJ/m from the approach magnetization to saturation curves that is in good agreement with A=(6.6±0.5) pJ/m obtained from Bloch T 3/2 law. The fractal dimensionality of the exchange coupled crystallite system in the porous media of the disordered CoPt alloy d=(2.60±0.18) was estimated from the approach magnetization to saturation curve. Coercive force decreases with temperature as Hc~T 3/2 which is assumed to be a consequence of the magnetic anisotropy energy reduction due to the thermal spin wave excitations in the investigated CoPt particles. © 2015 Elsevier B.V. All rightsreserved.Демонстрируются и обсуждаются различные проявления эффектов обменного взаимодействия в кривых намагниченности наноструктуированных частиц CoPt. Межзеренная обменная константа А в агломератах губчатой структуры кристаллитов оценивается как /A/=(7±1) pJ/m из кривых приближения намагниченности к насыщению, это значение находится в хорошем согласии с /A/=(6.6±0.5) pJ/m, полученным из закона /T/. /2 Блоха. Размерность фрактала обменно-соединенных кристаллических систем в пористой среды неупорядоченного сплава CoPt /d/=(2.60±0.18) оценивалась из кривых приближения намагниченности к насыщению. Коэрцитивная сила уменьшается с температурой по закону /H_c /~/T/. /2 , который, как предполагается, есть следствие уменьшения энергии магнитной анизотропии из-за теплового возбуждения спиновых волн в изучаемых частицах CoPt.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Zimin A. A., Filatov E. Y., Korenev S. V., Shubin Y. V., Chizhik N. A., Yurkin G.Yu., Eremin E. V.
Заглавие : Magnetic anisotropy and order parameter in nanostructured CoPt particles
Коллективы : RFBR [11-03-00168-a, 12-02-00943-a]; Interdisciplinary integration of fundamental research of SB RAS [64]; Russian Federation [MK-1934.2013.3]
Место публикации : Appl. Phys. Lett.: American Institute of Physics, 2013. - Vol. 103, Is. 15. - Ст.152404. - P. - ISSN 0003-6951, DOI 10.1063/1.4824973
Примечания : Cited References: 36. - The authors are grateful to Dr. A. V. Zadesenets for synthesis of CoPt complex precursor and Dr. A. S. Bogomyakov for assistance in magnetic measurements. The work was supported by RFBR (Grant Nos. 11-03-00168-a and 12-02-00943-a), Interdisciplinary integration of fundamental research of SB RAS (2012-2014) project No. 64, and grant of the President of the Russian Federation (No. MK-1934.2013.3).
Предметные рубрики: FEPT THIN-FILMS
REMANENT MAGNETIZATION
UNIAXIAL ANISOTROPIES
FINE PARTICLES
NANOPARTICLES
FERROMAGNETS
PHASE
Аннотация: The correlation of magnetic anisotropy energy with order parameter in the crystallites of CoPt nanostructured particles prepared by thermal decomposition and further annealing has been studied by investigation of the approach magnetization to saturation curves and x-ray powder diffraction pattern profiles. It is shown that magnetic anisotropy energy value in partially ordered CoPt crystallite could be described as an intermediate case between two extremes, corresponding to either single or several c-domains of L1(0) phase in crystallite. (C) 2013 AIP Publishing LLC.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Tambasov I. A., Bayukov O. A., Zhigalov V. S., Bykova L. E., Mikhlin Yu. L., Volochaev M. N., Bondarenko G. N.
Заглавие : Solid state synthesis and characterization of ferromagnetic nanocomposite Fe-In2O3 thin films
Место публикации : J. Alloys Compd.: Elsevier Science, 2014. - Vol. 612. - P.189-194. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2014.05.176. - ISSN 1873-4669
Примечания : Cited References: 56
Предметные рубрики: HIGH-TEMPERATURE FERROMAGNETISM
PHASE-FORMATION
In2O
OXIDE
NANOPARTICLES
CO
SEMICONDUCTORS
NANOCRYSTALS
COMBUSTION
SYSTEMS
Ключевые слова (''Своб.индексиров.''): thermite reactions--reactive films--ferromagnetic nanocomposite films--transparent conducting oxides
Аннотация: We have successfully synthesized ferromagnetic Fe-In2O 3 nanocomposite thin films for the first time using the thermite reaction Fe2O3 + In = In2O3 + Fe. The initial In/Fe2O3 bilayers were obtained by the deposition of In layers on α-Fe2O3 films. The reaction occurs in a self-propagating mode in a homogeneous thermal film plane field at heating rates above 20 K/s and at temperatures above initiation temperature T[[d]]in[[/d]] ~ 180 °C. At heating rates lower than 20 K/s the mixing of the In and Fe2O3 layers occurs across the whole In/Fe2O3 interface and the synthesis of the ferromagnetic α-Fe phase starts above the initiation temperature T[[d]]in[[/d]] = 180 °C. X-ray diffraction, X-ray photoelectron spectroscopy, Mossbauer spectroscopy, transmission electron microscopy and magnetic measurements were used for phase identification and microstructure observation of the synthesized Fe-In2O3 samples. The reaction products contain (1 1 0) textured α-Fe nanocrystals with a diameter around 100 nm and surrounded by an In2O3 matrix. These results enable new efficient low-temperature methods for synthesizing ferromagnetic nanocomposite films containing ferromagnetic nanoclusters embedded in transparent conducting oxides. © 2014 Elsevier B.V. All rights reserved.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Vorotynov A. M., Tugarinov V. I., Zharkov S. M., Velikanov D. A., Abramova G. M., Zeer G. M., Ramasamy K., Gupta A.
Заглавие : Structural and magnetic resonance investigations of CuCr2S4 nanoclusters and nanocrystals
Коллективы : Grant CRDF-SB RAS "New Nano-size and Layered Cu-containing Sulphides for Electronics" [RUP1-7054-KR-11, 16854]; Ministry of education and science of the Russian Federation
Место публикации : J. Appl. Phys.: American Institute of Physics, 2014. - Vol. 116, Is. 5. - Ст.54302. - ISSN 0021-8979, DOI 10.1063/1.4891993. - ISSN 1089-7550
Примечания : Cited References: 26. - The work was supported by a Grant CRDF-SB RAS "New Nano-size and Layered Cu-containing Sulphides for Electronics" RUP1-7054-KR-11, N 16854. S.M.Z. acknowledges support from the Ministry of education and science of the Russian Federation (in the framework of the state assignment for SFU for 2014).
Предметные рубрики: SUPERPARAMAGNETIC RESONANCE
NANOPARTICLES
GLASS
BIOMEDICINE
PARTICLES
SPINELS
Аннотация: Nanoclusters and nanocrystals of the room temperature magnetic spinel CuCr2S4 synthesized using a facile solution-based method have been examined by transmission electron microscopy, magnetic measurements, and magnetic resonance over a wide frequency range 9.6–80 GHz and at temperatures down to 4.2 K. Decreasing of the resonance field and broadening of the resonance lines below 50 K for both samples are due to the freezing of magnetic moments of nanocubes and nanocrystalline particles constituting nanoclusters. The effective fields of averaged magnetic anisotropy (HA)≌2.4 kOe are similar for both nanopowder samples as estimated from resonance measurements at T = 4.2 K. An additional blocking temperature T b ≅ 300 K appears in nanoclusters due to freezing of the magnetic moment of the entire cluster as a whole. Below this blocking temperature, the magnetic dipolar field acting in boundary areas of interacting constituent nanocrystals is responsible for the additional low-field resonance line observed in the resonance spectra of nanoclusters at X-band.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Uschakov A. V., Karpov I. V., Lepeshev A. A., Zharkov S. M.
Заглавие : The influence of oxygen concentration on the formation of CuO and Cu2O crystalline phases during the synthesis in the plasma of low pressure arc discharge
Место публикации : Vacuum: Elsevier, 2016. - Vol. 128. - P.123-127. - ISSN 0042207X (ISSN), DOI 10.1016/j.vacuum.2016.03.025
Примечания : Cited References: 19. - This study was supported by the Russian Foundation for Basic Research. (Project No 15-08-02132).
Предметные рубрики: Nanoparticles
Oxide
Ключевые слова (''Своб.индексиров.''): oxides--vapor deposition--x-ray diffraction--transmission electron microscopy (tem)--catalytic properties
Аннотация: This paper describes the synthesis of copper oxide nanoparticles with different percentages of CuO and Cu2O phases. It was achieved by the control of the percentage of oxygen in the gas mixture (N2 + O2) in a plasma-chemical process of evaporation-condensation by means of low-pressure arc discharge. In all the experiments, the pressure in the plasma-chemical reactor remained constant at 60 Pa. By means of X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) it was found that the average particle size was 6 nm, and Cu2O phase content decreases with increasing oxygen content in the gas mixture. High photocatalytic properties of Cu2O powder were shown by the example of the reaction of the methyl orange dye decomposition in water solution. The problems, associated with the performance of this method and the formation of crystalline phases, are discussed.
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