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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuzovnikova L. A., Denisova E. A., Komogortsev S. V., Iskhakov R. S., Nemtsev I. V., Shepeta N. A.
Заглавие : Effect of intensive plastic deformation on structure and magnetic properties of Al2O3/Co(P) nanocomposite particles
Коллективы : Fundamental Bases of Mechanochemical Technologies, International Conference, "Фундаментальные основы механохимических технологий", международная конференция, Институт химии твердого тела и механохимии Сибирского отделения РАН, Новосибирский государственный университет
Место публикации : V International conference "Fundamental bases of mechanochemical technologies". FBMT- 2018: book of abstracts : [25-28 June 2018, Novosibirsk, Russia]. - 2018. - P.141. - ISBN 978-5-4437-0794-5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Денисова, Елена Александровна, Кузовникова, Людмила Александровна, Комогорцев, Сергей Викторович, Исхаков, Рауф Садыкович, Немцев, Иван Васильевич, Шепета, Наталья Александровна
Заглавие : Модификация структуры и магнитных свойств композиционных частиц AL2O3/CO(P) в процессе механоактивации
Коллективы : Международная конференция "Фундаментальные основы механохимических технологий"
Место публикации : Химия в интересах устойчив. разв. - 2018. - Т. 26, № 5. - С. 495-499. - ISSN 0869-8538, DOI 10.15372/KhUR20180507
Примечания : Библиогр.: 12
Аннотация: Исследовано изменение структуры и магнитных свойств композиционных частиц Al2O3/Co(P) в процессе механоактивации в шаровой мельнице. Исходные частицы получены методом химического осаждения на гранулы Al2O3 кристаллической оболочки Co95P5, характеризующейся гексагональной плотно упакованной структурой. Установлено, что порядок фазовых превращений в процессе механоактивации различен для частиц Co95P5 и композиционных частиц Al2O3/Co95P5. Использование композиционных частиц позволяет значительно уменьшить время механоактивации, необходимое для создания оптимального фазового соотношения α/β-кобальта в порошках. Уменьшение размеров зерен в процессе перемола приводит к увеличению доли суперпарамагнитных частиц, достигающей 12 % при механоактивации в течение 75 мин. Как следствие, снижается намагниченность насыщения. Изменение магнитных свойств композиционных частиц в процессе перемола коррелирует с модификацией структуры образцов. Величина поля локальной анизотропии определяется количеством гексагональной плотно упакованной фазы кобальта в образце и уменьшается с 8.4 до 3.8 кЭ при увеличении продолжительности механоактивации до 75 мин.Changes of the structure and magnetic properties of Al2O3/Co(P) composite particles during mechanical activation in a ball mill were studied. The particles were obtained by means of chemical deposition of the crystalline shell composed of Co95P5, characterized by the hexagonal packed structure, onto Al2O3 granules. It was established that the order ot phase transformations during mechanical activation is different for Co95P5 particles and for composite Al2O3/Co95P5 particles. The use of composite particles allows a substantial decrease in activation time necessary for the creation of the optimal phase ratio of α/β-cobalt in the powders. A decrease in grain size during grinding causes an increase in the fraction of super-paramagnetic particles, which reaches 12 % after mechanical activation for 75 min. As a consequence, saturation magnetization decreases. The change of the magnetic properties of the composite particles during grinding correlates with the modification of sample structure. The value of the field of local anisotropy is determined by the amount of the hexagonal tightly packed cobalt phase in the sample and decreases from 8.4 to 3.8 kE with an increase in the time of mechanical activation to 75 min.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Balaev D. A., Kirillov V. L., Bayukov O. A., Mart'yanov O. N.
Заглавие : Mossbauer spectroscopy study of the superparamagnetism of ultrasmall ε-Fe2O3 nanoparticles
Коллективы : Russian Science Foundation [17-12-01111]
Место публикации : JETP Letters. - 2018. - Vol. 108, Is. 8. - P.527-531. - ISSN 0021-3640, DOI 10.1134/S0021364018200092. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 22. - This work was supported by the Russian Science Foundation (project no. 17-12-01111).
Предметные рубрики: High-temperature
Particles
ε-Fe2O3
Phase
Model
Аннотация: The superparamagnetism of an ensemble of ϵ-Fe2O3 nanoparticles with a mean size of 3.9 nm dispersed in a xerogel SiO2 matrix is studied by the Mössbauer spectroscopy method. It is shown that most nanoparticles at room temperature are in the superparamagnetic (unblocked) state. As the temperature decreases, the progressive blocking of the magnetic moments of the particles occurs, which is manifested in the Mössbauer spectra as the transformation of the quadrupole doublet into a Zeeman sextet. The analysis of the relative intensity of the superparamagnetic (quadrupole doublet) and magnetically split (sextets) spectral components in the range of 4–300 K provides the particle size distribution, which is in agreement with the transmission electron microscopy data. The values of the effective magnetic anisotropy constants (Keff) are determined, and the contribution of surface anisotropy (KS) is estimated for particles of various sizes. It is shown that the quantity Keff is inversely proportional to the particle size, which indicates the significant contribution of the surface to the magnetic state of the ϵ-Fe2O3 nanoparticles with the size of several nanometers.
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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 сборника (однотомник)
Шифр издания :
Автор(ы) : Kuzovnikova L.A., Denisova E. A., Chekanova L. A., Nemtsev I. V., Komogortsev S. V., Iskhakov R. S.
Заглавие : Tuning local magnetic anisotropy in core-shell Co@Cu particles by dynamic compacting and the shell build-up
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-I1-8. - P.788 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskiy A. A., Krasikov A. A., Popkov S. I., Balaev A. D., Shaikhutdinov K. A., Kirillov V. L., Mart'yanov O. N.
Заглавие : Magnetic properties of NiO nano particles: Contributions of the antiferromagnetic and ferromagnetic subsystems in different magnetic field ranges up to 250 kOe
Коллективы : Russian Foundation for Basic Research; Government of the Krasnoyarsk Territory; Krasnoyarsk Territorial Foundation [17-42-240138]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 8. - P.1547-1552. - ISSN 1063-7834, DOI 10.1134/S1063783417080029. - ISSN 1090-6460(eISSN)
Примечания : Cited References:40. - This study was supported by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Territory, and Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 17-42-240138.
Предметные рубрики: EXCHANGE-BIAS
FERRIHYDRITE NANOPARTICLES
HYSTERESIS ANOMALIES
OXIDE
Аннотация: The magnetic properties of antiferromagnetic NiO nanoparticles prepared by thermal decomposition of nickel hydroxocarbonate are investigated. According to the data of magnetization measurements in fields of up to 250 kOe, the magnetic moment linearly grows in strong fields, which is caused by the contribution of the antiferromagnetically ordered nanoparticle core, and the antiferromagnetic susceptibility corresponds to that of bulk polycrystalline NiO. This allowed the antiferromagnetic and ferromagnetic contributions to the total magnetic response of a sample to be quantitatively determined. The latter occurs due to the incomplete spin compensation in an antiferromagnetic nanoparticle caused by defects on its surface. It is demonstrated that to correctly determine the superparamagnetic blocking temperature, it is necessary to take into account the antiferromagnetic susceptibility of the particle core.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk A. P., Gerasimov V. S., Ershov A. E., Karpov S. V.
Заглавие : Temperature dependent elastic repulsion of colloidal nanoparticles with a polymer adsorption layer
Коллективы : Russian Foundation for Basic Research; government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science [18-42-243023]; RF Ministry of Science and Education,; State contract with Siberian Federal University for scientific research in 2017-2019; SB RAS Program [II.2P (0358-2015-0010)]
Место публикации : Colloid Polym. Sci. - 2018. - Vol. 296, Is. 10. - P.1689-1697. - ISSN 0303-402X, DOI 10.1007/s00396-018-4383-y. - ISSN 1435-1536(eISSN)
Примечания : Cited References: 49. - The reported research was funded by the Russian Foundation for Basic Research, the government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science, grant 18-42-243023, the RF Ministry of Science and Education, the State contract with Siberian Federal University for scientific research in 2017-2019, and SB RAS Program No II.2P (0358-2015-0010).
Предметные рубрики: STERICALLY-STABILIZED PARTICLES
DEPLETION FLOCCULATION
AGGREGATION
Ключевые слова (''Своб.индексиров.''): nanoparticle--adsorption layer--elastic deformation--coagulation--kinetics--elasticity modulus
Аннотация: The model of pairwise elastic repulsion of contacting colloidal nanoparticles with a rigid core and deformable shell is discussed. A simple analytical equation is applied for the energy of elastic repulsion of nanoparticles with arbitrary sizes and the elasticity moduli of self-healing polymer adsorption layers. The model is based on the representation of the absorption layer as a continuous medium that is elastically deformed upon the contact of nanoparticles. The major characteristic of this medium is the elasticity modulus. The magnitude of the elasticity modulus is determined from the condition of balance of the van der Waals attractive forces of nanoparticles and the elastic repulsion of their adsorption layers in the contact area, taking into account the temperature variations. We employed the kinetic approach to describe the dependence of the elasticity modulus on both the temperature and the rate of its change.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Vnukova N. G., Nikolaev N. S., Glushenko G. A., Osipova I. V., Lopatin V. A., Komogortsev S. V., Velikanov D. A., Volochaev M. N., Nemtsev I. V.
Заглавие : Nanodispersed powders of Fe-Ni particles with carbon shell
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2017. - Vol. 10, Is. 4. - P.509-513. - ISSN 19971397 (ISSN), DOI 10.17516/1997-1397-2017-10-4-509-513; Журн. СФУ. Сер. "Математика и физика"
Примечания : Cited References: 8
Ключевые слова (''Своб.индексиров.''): carbon--iron--nanoparticles--nickel
Аннотация: The initial carbon condensate containing nickel-iron nanoparticles with a graphite conversion was syn- thesized in the high-frequency carbon-helium arc plasma at ambient pressure. The nickel-iron particles were extracted by the treatment of the carbon condensate with nitric and hydrochloric acids. Undissolved residue and dissolved sample were received. Undissolved residue has both the structure and magnetic properties of (MR/Ms = 0.30, Hc = 270 Oe). Lack of hysteresis loops for the dissolved sample shown that metals are in the paramagnetic state.Исходный углеродный конденсат, содержащий железоникелевые наночастицы с углеродной оболочкой, был синтезирован в углеродно-гелиевом дуговом ВЧ–разряде при атмосферном давлении. Железоникелевые частицы были выделены обработкой углеродного конденсата азотной и гидрохлоридной кислотами. В результате были получен нерастворимый остаток и растворимый образец. Нерастворимый остаток имеет как структурные, так магнитные характеристики (MR / Ms = 0.30, Hc = 270 Oe). Растворимый образец продемонстрировал отсутствие петли гистерезиса, что характерно для металлов в парамагнитном состоянии.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankin P. S., Vetrov S. Ya., Timofeev I. V.
Заглавие : Tamm plasmon in a structure with the nanocomposite containing spheroidal core-shell particles
Коллективы : Russian Foundation for Basic Research; Government of the Krasnoyarsk Territory; Krasnoyarsk Territorial Foundation [17-42-240464]; Scholarship of the President of the Russian Federation [SP-227.2016.5]
Место публикации : J. Opt.: IOP, 2019. - Vol. 21, Is. 3. - Ст.035103. - ISSN 2040-8978, DOI 10.1088/2040-8986/ab04d8. - ISSN 2040-8986(eISSN)
Примечания : Cited References: 49. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project No. 17-42-240464. P S P acknowledges the support of the Scholarship of the President of the Russian Federation No. SP-227.2016.5.
Предметные рубрики: DIMENSIONAL PHOTONIC CRYSTAL
ENHANCEMENT
EMISSION
STATES
Ключевые слова (''Своб.индексиров.''): tamm plasmon--nanocomposite--photonic crystal--core-shell particles
Аннотация: Spectral peculiarities of the structure consisting of a photonic crystal coated with a nanocomposite (NC) have been investigated. The NC used contains spheroidal nanoparticles with a dielectric core and a metallic shell, which are uniformly dispersed in a transparent matrix. The spectral manifestation of the observed Tamm plasmon polariton (TPP) and Fabry-Perot mode has been examined. A significant polarization sensitivity of the spectra upon variation in the nanoparticle shape has been demonstrated. The dispersion curves presented for the TPP and Fabry-Perot mode are shown to be in good agreement with the spectra obtained by the transfer matrix method.
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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F.
Заглавие : Interaction between dielectric particles enhances the Q-factor
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [19-02-00055]; Ministry of Education and Science of Russian FederationMinistry of Education and Science, Russian Federation [3.1845.2017/4.6]
Место публикации : Adv. Electromagn. - 2019. - Vol. 8, Is. 4. - P.108-117. - ISSN 2119-0275, DOI 10.7716/aem.v8i4.1292
Примечания : Cited References: 36. - We acknowledge discussions with A.A. Bogdanov and D.N. Maksimov. This work was partially supported by RFBR grant 19-02-00055 and Ministry of Education and Science of Russian Federation (state contract N 3.1845.2017/4.6).
Предметные рубрики: WHISPERING-GALLERY MODES
MULTIPLE-SCATTERING
STATES
Аннотация: We study behavior of resonant modes with a distance between two dielectric resonators shaped as cylinders and disks. We reveal two basic scenarios of evolution of resonances with the distance between the cylinders. For larger distances and respectively weaker interaction of particles the resonances are bound around the resonances of isolated resonators and evolve by spiral way. For shorter distances and respectively stronger interaction the resonances bypass the isolated resonances. Both scenarios demonstrate considerable enhancement of the Q factor compared to the case of isolated particle.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : Effect of Coulomb repulsion on the London penetration depth in cuprate superconductors
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00837, 20-32-70059]; Government of Krasnoyarsk Region; Krasnoyarsk Regional Science and Technology Support Fund [18-42-240014, 18-42-243002]; Council for Grants of the President of the Russian Federation [MK-1641.2020.2]
Место публикации : Phys. Scr. - 2020. - Vol. 95, Is. 6. - Ст.065806. - ISSN 0031-8949, DOI 10.1088/1402-4896/ab8163. - ISSN 1402-4896(eISSN)
Примечания : Cited References: 57. - The work was financially supported by the Russian Foundation for Basic Research (project #18-02-00837, #20-32-70059), the Government of Krasnoyarsk Region, the Krasnoyarsk Regional Science and Technology Support Fund (projects: #18-42-240014 'One-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors' and #18-42-243002 'Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors'). The work of KKK was supported by the Council for Grants of the President of the Russian Federation (project MK-1641.2020.2).
Предметные рубрики: ELECTRONIC-STRUCTURE
SUPERFLUID DENSITY
QUASI-PARTICLES
2-BAND MODEL
Аннотация: We study the effect of Coulomb repulsion between oxygen holes on the London penetration depth λ based on the concept of spin-polaron nature of Fermi quasiparticles in cuprates superconductors. It is shown that for the generally accepted values of the parameters of the spin-fermion model, taking into account the Coulomb interaction, both the one-site Hubbard U p and interaction between holes on the next-nearest-neighbor oxygen ions V 2, allows one to achieve a much better agreement of the calculated temperature dependencies of the value λ −2 with the experimental data in La2−x Sr x CuO4 in a wide range around optimal doping.
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14.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F.
Заглавие : Interaction between dielectric particles enhances the Q factor.
Коллективы : International Conference on Metamaterials and Nanophotonics
Место публикации : International Conference on Metamaterials and Nanophotonics (4 ; 2019 ; 15 - 19 July ; St. Petersburg, Russian Federation). Journal of Physics: Conference Series. - 2020. - Vol. 1461, Is. 1. - Ст.012144. - , DOI 10.1088/1742-6596/1461/1/012144
Примечания : Cited References: 22. - This work was supported by Russian Science Foundation through Grant 19-02-00055. A. S. thanks A. Bogdanov for numerous and fruitful discussions
Аннотация: We consider resonant modes of two dielectric identical particles which can be classified as symmetric and anti symmetric combinations of the resonant modes of individual particles. We show that an approaching of two particles gives rise to an avoided crossing of resonant poles because of interaction between the disks. That in turn results in strong enhancement of the quality factor factor of two disks compared to isolated disks.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komogortsev S. V., Chekanova L. A., Denisova E. A., Shabanova O. G., Shabanov A. V., Nemtsev I. V., Neznakhin D. S., Fel’k V. A., Matsynin A. A., Iskhakov R. S.
Заглавие : Magnetic coatings on the spherical sub-micron particles
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.J.P26. - P.234. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : High-Q resonant modes in a finite array of dielectric particles
Коллективы : Ministry of Education and Science of the Russian Federation [3.1845.2017]; RFBR [19-02-00055]
Место публикации : Phys. Rev. A. - 2019. - Vol. 99, Is. 3. - Ст.033851. - ISSN 2469-9926, DOI 10.1103/PhysRevA.99.033851. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 58. - We acknowledge discussions with D. N. Maksimov. This work was partially supported by the Ministry of Education and Science of the Russian Federation (State Contract No. 3.1845.2017) and RFBR Grant No. 19-02-00055.
Предметные рубрики: OPTICAL BOUND-STATES
PERIODIC ARRAY
CONTINUUM
LIGHT
ENHANCEMENT
Аннотация: We trace the Q factor of the resonant modes which are limited to bound states in the continuum (BICs) for N=∞ in the finite array of N dielectric spheres and disks. For the symmetry-protected BICs we observe the quadratic dependence of the Q factor on N for high-refractive-index particles, while for low-refractive-index particles there is an interplay between the quadratic and cubic dependencies. The Q factor of accidental BICs grows cubically with N. We show that a plane wave can excite these quasi-BICs for tuning of the angle of incidence.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Nikolaev N. S., Osipova I. V., Cherepakhin A. V., Nemtsev I. V., Velikanov D. A., Andyuseva V. G.
Заглавие : Core-shell Nanosize Particles Mg@Ni: Synthesis and Properties
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2019. - Vol. 12, Is. 1. - P.28-35. - ISSN 1997-1397, DOI 10.17516/1997-1397-2019-12-1-28-35; \b Журнал СФУ. Математика и физика. - ISSN 2313-6022(eISSN)
Примечания : Cited References: 12
Ключевые слова (''Своб.индексиров.''): core-shell--nanopartials--nickel-magnesium--synthesis in plasma--surface coating--частицы ядро–оболочка--наночастицы--никель-магниевые частицы--плазмохимический синтез--покрытие поверхности частицы
Аннотация: In this paper, we study particles with metallic core (magnesium) - metal shell (nickel) structure, synthesized in metal-containing plasma of high frequency arc discharge. X-ray diffraction analysis, X-ray fluorescence analysis and scanning electron microscopy show that the particles have a uniform nickel shell, which is also indirectly confirmed by comparing the results of hydrogenation of Mg and Mg@Ni particles. Measurement of volume magnetization indicates that shell thickness of most particles is not more than 22 nm.В данной работе исследованы частицы со структурой металлическое ядро (магний) - металлическая оболочка (никель), полученные в металлсодержащей высокочастотной плазме дугового разряда. Методами рентгенофазового анализа, рентгенофлуоресцентного анализа, сканирующей электронной микроскопии показано, что частицы имеют сплошную никелевую оболочку, что также косвенно подтверждается сравнением результатов гидрирования частиц Mg и Mg@Ni. С помощью измерений объемной намагниченности установлено, что наибольшая часть частиц имеет толщину оболочек не более 22 нм.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Stolyar S. V., Ladygina V. P., Balaev D. A., Pankrats A. I., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Magnetic resonances in nanoscale particles of biogenic ferrihydrite
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.M.P9. - P.502-503. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 5. - The reported study was carried out with the financial support of the Russian Foundation for Fundamental Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Territory Fund for Support of Scientific and Technical Activity in the framework of scientific Project No. 18 43-243003. The work is supported by the Special Program of the Ministry of Education and Science of the Russian Federation for the Siberian Federal University
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19.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Kuzovnikova, Ludmila, Komogortsev S. V., Denisova E. A., Iskhakov R. S., Nemtsev I. V., Volochaev M. N., Shepeta, Natalia
Заглавие : Structure and magnetism in ball-milled core-shell Al2O3@Co particles
Коллективы : International Conference on Fundamental Bases of Mechanochemical , Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [18-42-240006]
Место публикации : Mater. Today: Proc. - 2019. - Vol. 12: 5th International Conference on Fundamental Bases of Mechanochemical (JUN 25-28, 2018, Russian Acad Sci, Siberian Branch, Inst Solid State Chem & Mechanochemistry, Novosibirsk, Russia), Pt. 1. - P.159-162. - , DOI 10.1016/j.matpr.2019.03.087
Примечания : Cited References: 19. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project No 18-42-240006.
Аннотация: The core-shell Al2O3@Co particles were prepared by the ball-milling of the composite Al2O3-Co particles synthesized by electroless reduction. During the ball-milling process, both, the core-shell particle size and the ratio of hcp/fcc phases changed. To perform a phase analysis of the cobalt shell we used an approach based on the magnetic measurements. The use of Al2O3-Co composite particles as the precursors for the ball milling significantly shortens the time needed for a change in the phase composition of cobalt.
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20.

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., Eremin E. V., Yurkin G. Yu.
Заглавие : Ordering and magnetic properties of nanostructured CoPt particles
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press Incorporation, 2017. - Vol. 81, Is. 3. - P.298-300. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873817030182
Примечания : Cited References: 9
Ключевые слова (''Своб.индексиров.''): crystallite size--bulk diffusions--copt alloys--degree of order--low-activation energy--nano-structured--ordering process--single domains--activation energy
Аннотация: The kinetics of ordering in nanostructured CoPt particles is investigated. The low activation energy (58 ± 2 kJ/mol) of the ordering process indicates that the kinetics of ordering is not limited by bulk diffusion. Coercivity grows along with the degree of ordering and reaches its maximum value of 14.2 kOe upon the complete ordering of CoPt alloy with a crystallite size of no more than that of a single domain. © 2017, Allerton Press, Inc.
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