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Общее количество найденных документов : 458
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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivantsov R., Vasiliev A., Stepanov S., Kornilova E., Zarubina T.
Заглавие : Superparamagnetic and ferrimagnetic nanoparticles in glass matrix
Место публикации : Physica B. - 2001. - Vol. 301, Is. 3-4. - P.203-211. - ISSN 0921-4526, DOI 10.1016/S0921-4526(01)00274-5
Примечания : Cited References: 9
Предметные рубрики: MAGNETIC-PROPERTIES
PARTICLES
FILMS
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--faraday rotation--faraday rotation--magnetic nanoparticles--crystal structure--faraday effect--ferrimagnetic materials--glass--particle size analysis--superparamagnetism--x ray diffraction analysis--amorphous glass matrices--faraday rotations--nanostructured materials
Аннотация: Faraday rotation (FR) spectral, field, and temperature dependencies in oxide glasses with small additions of paramagnetic elements are investigated. Formation of ferrite nanoparticles in amorphous glass matrices is revealed by X-ray diffraction. Particles have crystal structure similar to spinel structure, their dimensions are about 10-24 nm. The FR field dependencies are typical for ferrimagnetic or superparamagnetic substances depending on particle size. Strong FR increase at the samples cooling (more than twice for some samples) in the temperature interval 105-273 K is observed. (C) 2001 Elsevier Science B.V. All rights reserved.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Komogortsev S. V., Balaev A. D., Okotrub A. V., Kudashov A. G., Kuznetsov V. L., Butenko Y. V.
Заглавие : Fe nanowires in carbon nanotubes as an example of a one-dimensional system of exchange-coupled ferromagnetic nanoparticles
Место публикации : JETP Letters. - 2003. - Vol. 78, Is. 4. - P.236-240. - ISSN 0021-3640, DOI 10.1134/1.1622038
Примечания : Cited References: 38
Предметные рубрики: MAGNETIC-PROPERTIES
RANDOM ANISOTROPY
ELECTRODEPOSITED NANOWIRES
NI NANOWIRES
ARRAYS
NANOCRYSTALLINE
ALUMINA
NICKEL
PORES
STATE
Аннотация: The cooperative phenomena revealed in the field and temperature dependences of the magnetization in a system of iron nanoparticles in carbon nanotubes were studied experimentally. The character of the temperature dependences of the magnetization indicates that the ferromagnetic Fe particles in carbon nanotubes are exchange-coupled. In the region where the magnetization approaches saturation, the magnetization curves reveal the power dependence DeltaM similar to H-3/2 typical for a one-dimensional system of exchange-coupled ferromagnetic nanoparticles. (C) 2003 MAIK "Nauka / Interperiodica".
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karpov S. V., Gerasimov V. S., Isaev I. L., Markel V. A.
Заглавие : Local anisotropy and giant enhancement of local electromagnetic fields in fractal aggregates of metal nanoparticles
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2005. - Vol. 72, Is. 20. - Ст.205425. - ISSN 1098-0121, DOI 10.1103/PhysRevB.72.205425
Примечания : Cited References: 56
Предметные рубрики: SMALL-PARTICLE COMPOSITES
DIFFUSION-LIMITED AGGREGATION
OPTICAL-PROPERTIES
SELECTIVE PHOTOMODIFICATION
NUMERICAL-SIMULATION
DISORDERED CLUSTERS
ABSORPTION-SPECTRUM
PARTICULATE MATTER
NONLINEAR OPTICS
LIGHT-SCATTERING
Аннотация: We have shown within quasistatic approximation that the giant fluctuations of a local electromagnetic field in random fractal aggregates of silver nanospheres are strongly correlated with a local anisotropy factor S which is defined in this paper. The latter is a purely geometrical parameter which characterizes the deviation of local environment of a given nanosphere in an aggregate from spherical symmetry. Therefore, it is possible to predict the sites with anomalously large local fields in an aggregate without explicitly solving the electromagnetic problem. We have also demonstrated that the average (over nanospheres) value of S does not depend noticeably on the fractal dimension D, except when D approaches the trivial limit D=3. In this case, as one can expect, the average local environment becomes spherically symmetrical and S approaches zero. This corresponds to the well-known fact that in trivial aggregates, fluctuations of local electromagnetic fields are much weaker than in fractal aggregates. Thus, we find that, within the quasistatics, the large-scale geometry does not have a significant impact on local electromagnetic responses in nanoaggregates in a wide range of fractal dimensions. However, this prediction is expected not to be correct in aggregates which are sufficiently large for the intermediate- and radiation-zone interaction of individual nanospheres to become important.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Denisova E. A., Balaev A. D., Myagkov V. G., Bulina N. V., Kudashov A. G., Okotrub A. V.
Заглавие : Magnetic anisotropy in the films of oriented carbon nanotubes filled with iron nanoparticles
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2005. - Vol. 31, Is. 6. - P454-456. - ISSN 1063-7850, DOI 10.1134/1.1969761
Примечания : Cited References: 5
Предметные рубрики: FE
Аннотация: Films of carbon nanotubes oriented perpendicularly to the substrate surface and filled with iron nanoparticles have been synthesized and studied. Morphological features of these nanocomposite films lead to the appearance of an easy magnetization axis, which is perpendicular to the film plane. A method for enhancement of this effect is suggested and successfully tested. (C) 2005 Pleiades Publishing, Inc.
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasil'eva I. G., Dovlitova L. S., Zajkovskij V. I., Malakhov V. V., Edel'man I. S., Stepanov A. S., Aleksandrov K. S.
Заглавие : Real composition and structure of manganese ferrite nanoparticles dispersed in the K-Al-B-O glasses
Место публикации : Dokl. Akad. Nauk. - 2005. - Vol. 401, Is. 3. - P.349-352. - ISSN 0869-5652
Ключевые слова (''Своб.индексиров.''): aluminum--boron compounds--ferrite--manganese--nanostructured materials--particles (particulate matter)--structure (composition)--borate glasses--exchange interaction--glass
Аннотация: For the first time the problem of determining real composition and structure of manganese ferrite nanoparticles dispersed borate glasses is solved using differentiating dissolution and high-resolution X-ray electron microscopy techniques. For the first time the nanosize effect of aluminum incorporation in manganese ferrite composition is experimentally shown, thus directly confirming the hypothesis of Al participation in exchange interaction between paramagnetic Fe and Mn ions as diamagnetic diluter.
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasilyeva I. G., Dovlitova L. S., Zaikovskii V. I., Malakhov V. V., Edel'man I. S., Stepanov A. S., Aleksandrov K. S.
Заглавие : Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix
Место публикации : Doklady Chemistry. - 2005. - Vol. 401, Is. 1-3. - P.47-50. - ISSN 0012-5008, DOI 10.1007/s10631-005-0029-y
Ключевые слова (''Своб.индексиров.''): boric acid--ferrite--glass--manganese derivative--analytic method--article--chemical composition--chemical structure--nanoparticle--stoichiometry--structure analysis--transmission electron microscopy--x ray analysis
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Shaikhutdinov K. A., Mal'tsev V. K., Okotrub A. V., Kudashov A. G., Shubin U. V.
Заглавие : Magnetic properties of NixCo1-x nanoparticles in carbon nanotubes
Место публикации : The Physics of Metals and Metallography. - Екатеринбург: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд), 2006. - Т. 102, №SUPPL. 1. - P. - ISSN 0031-918X, DOI 10.1134/S0031918X06140171. - ISSN 1531-8672(eissn)
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8.

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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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Petrov M. I., Rabchevskii E. V., Anshits A. G.
Заглавие : Magnetic properties of nanoparticles of cenospheres from energetic ashes
Место публикации : The Physics of Metals and Metallography. - Екатеринбург: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд), 2006. - Vol. 102, Suppl. 1. - ISSN 0031-918X, DOI 10.1134/S0031918X06140122. - ISSN 1531-8672(eissn)
Аннотация: The application of magnetic cenospheres including ferrospinel nanoparticles as a “transport container” in medicine and biology is quite attractive. Their nanoscale size, high porosity, and well pronounced magnetic properties provide good consumer choice. In this contribution, we report on the magnetic properties of microspheres from energetic ashes of Ekibastuz coals.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivantsov R. D., Vasil'eva I.G., Vasil'ev A. D., Bayukov O. A., Ivanova O. S., Prokof'ev D. E., Stepanov S.A., Kornilova E.E., Zerubina T.V., Malakhov V.V., Zaikovskii V.A.
Заглавие : Magnetic Nanoparticles in Oxide Glasses
Место публикации : Physics of Metals and Metallography. - 2006. - Vol. 102, Suppl. 1, Chapter 11. - P.S2-S7. - DOI 10.1134/S0031918X0614002X
Примечания : Библиогр.: 13. - Integrated Project of the Siberian Division of the Russian Academy of Sciences no. 88-2003, and by the Federal Program RNP, project no. 2.1.1.7376.
Аннотация: Unique properties of the potassium–aluminum–boron glasses doped with low concentrations of MnO and Fe2O3 to make them magnetically ordered and optically transparent in the IR and visible ranges are due to the formation of nanoparticles of a cubic ferrite. Assembling and properties of nanosized ferrite particles in the glasses have been investigated by X-ray diffraction, differential dissolution analysis, high-resolution transmission electron microscopy, Mössbauer spectroscopy, magnetic measurements, and magnetooptical Faraday effect. It was shown that the ferrite particles vary highly in size, shape, stoichiometry, structural perfection, and space distribution depending on the preparation conditions. A correlation between the characteristics of nanostructured ferrite particles and magnetic properties of glasses has been established.
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