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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyubutin I. S., Starchikov S. S., Lin Chun-Rong, Lu Shin-Zong, Shaikh M. O., Funtov K. O., Dmitrieva T. V., Ovchinnikov S. G., Edelman I. S., Ivantsov R. D.
Заглавие : Magnetic, structural, and electronic properties of iron sulfide Fe3S4 nanoparticles synthesized by the polyol mediated process
Место публикации : J. Nanopart. Res.: Springer, 2013. - Vol. 15. - P.1397. - DOI 10.1007/s11051-012-1397-0
Аннотация: Iron sulfide nanoparticles Fe3S4 with the spinel-type crystal structure were synthesized by the polyol mediated process. The particle size depends on preparation conditions and varies from 9 to 20 nm. Mössbauer data have revealed that the dominating fraction of iron ions in the 9-nm sample is in the high-spin ferric state. This implies an occurrence of the cation vacancies in nonstoichiometric greigite. The stoichiometric phase of greigite Fe3S4 dominates in the 18-nm-size nanoparticles. Magnetic measurements have shown a ferrimagnetic behavior of all samples at temperatures between 78 and 300 K. The estimated value of magnetic moment of the stoichiometric greigite nanoparticles is about 3.5 μB per Fe3S4 unit. The Mössbauer spectra indicate a superparamagnetic behavior of small particles, and some fraction of superparamagnetic phase is observed in all samples synthesized which may be caused by the particle size distribution. The blocking temperatures of T B ≈ 230 and 250 K are estimated for the 9 and 14 nm particles, respectively. The Mössbauer parameters indicate a great degree of covalency in the Fe–S bonds and support the fast electron Fe3+ ⇆ Fe2+ exchange in the B-sites of greigite. An absence of the Verwey transition at temperatures between 90 and 295 K is established supporting a semimetal type of conductivity. The temperature and magnetic field dependences of the magnetic circular dichroism (MCD) of optical spectra were measured in Fe3S4 for the first time. The spectra differ substantially from that of the isostructural oxide Fe3O4. It is supposed that the MCD spectra of greigite nanoparticles result from the collective electron excitations in a wide band with superimposed peaks of the d–d transitions in Fe ions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Petrov D. A., Ivantsov R. D., Zharkov S. M., Velikanov D. A., Gumarov G. G., Nuzhdin V. I., Valeev V. F., Stepanov A. L.
Заглавие : Study of morphology, magnetic properties, and visible magnetic circular dichroism of Ni nanoparticles synthesized in SiO2 by ion implantation
Место публикации : Physical Review B - Condensed Matter and Materials Physics. - 2013. - Vol. 87, Is. 11. - Ст.115435. - P. - ISSN 1098-0121, DOI 10.1103/PhysRevB.87.115435
Аннотация: A systematic study of ensembles of nickel nanoparticles fabricated by Ni+-ion implantation at a dose of (0.5-1.0)?1017 ions/cm2 in a thin near-surface layer of an amorphous SiO2 matrix by means of transmission electron microscopy (TEM), dc magnetic measurements, and magneto-optical technique is presented. TEM characterization of Ni nanoparticles proves the formation of isolated spherical nickel nanoparticles with diameters from 2 to 16 nm. The crystal structure and lattice constant of the nanoparticles correspond to face-centered-cubic Ni. The larger size nanoparticles are shown to have core-shell structure, which is unusual for the implantation conditions used. The shell of these nanoparticles consists of Ni, while the core has supposedly the composition coinciding with the matrix, i.e., SiO2. The core-shell nanoparticles in the investigated sample coexist with ordinary pure Ni nanoparticles, which strongly affects the magnetic and especially magneto-optic properties of the samples. For all three doses, the nanoparticles are in the superparamagnetic state at room temperature passing to the "frozen" state at lower temperatures. However, only the sample implanted with the lowest dose demonstrates the classic superparamagnetic behavior according to the shape of the experimental magnetization temperature dependencies for the zero-field-cooled (ZFC) and field-cooled regimes. This shape deviation from that characteristic of the pure superparamagnetic ensembles is ascribed mainly to the particle core-shell structure. The Ni nanoparticles' anisotropy constant estimated with the help of ZFC curves appears to exceed the bulk Ni anisotropy second constant approximately by two orders of magnitude. Magnetic circular dichroism (MCD) is characterized by spectral dependence modified strongly as compared to the MCD spectra of a continuous Ni film. In the spectral range 1.1-4.2 eV, the MCD spectrum consists of two broad maxima of opposite sign with the characteristics depending on the implantation dose and the measurement temperature. The MCD spectra analysis allows one to show that the higher-energy maximum (at 3.34-3.48 eV depending on the dose) is related to the surface plasmon resonance (SPR) excitation in pure Ni nanoparticles, while the lower-energy maximum (at 2.19-2.73 eV depending on the dose) should be associated with the SPR excitation in core-shell nanoparticles. В© 2013 American Physical Society.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Ivantsov R. D., Petrakovskaya E. A., Великанов, Дмитрий Анатольевич, Trofimova N. N., Zubavichus Y. V.
Заглавие : Ensembles OF[[d]]γ[[/d]]-Fe[[d]]2[[/d]]O[[d]]3[[/d]] nanoparticles formed during devitrification of borate glasses
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 138. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrov D. A., Edel'man I. S., Ivantsov R. D., Zharkov S. M., Stepanov A. L.
Заглавие : Magnito-optics of cobalt and nickel nanoparticles implanted in sIo[[D]]2[[/D]]: comparative study
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 225. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O., Ivantsov R. D., Petrakovskaja E. A., Velikanov D. A., Zabluda V. N., Hennet L., Thiaudiere D., Saboungi M. L., Zubavichus Y., Stepanov S., Zaikovskii V. I., Artemenko A., Kliava J.
Заглавие : Nanoparticle-containing glasses co-doped with transition and rare earth elements: comparative studies of transparent magnets
Коллективы : International Conference on the Chemistry of Glasses and Glass-Forming Melts (2011 ; Sept.; Oxford, England)
Место публикации : Phys. Chem. Glasses - Eur. J. Glass Sci. Technol. Part B: Society of Glass Technology, 2012. - Vol. 53, Is. 2. - P.37-44. - ISSN 1753-3562
Примечания : Cited References: 22
Предметные рубрики: ANISOTROPY
RESONANCE
FERRITE
Аннотация: A comparative multitechnique study (including transmission electron microscopy, synchrotron radiation, static magnetisation, magnetic circular dichroism and electron magnetic resonance) has been carried out of nanoparticle-containing borate glasses of two different types: (i) with iron and manganese oxide additives and (ii) with iron and rare earth oxide additives. Due to the presence of magnetic nanoparticles, these glasses have a nonlinear magnetic field dependence of magnetization with hysteresis and saturation while remaining transparent in the visible and near-infrared spectral ranges. The nature of the nanoparticles has been identified as manganese ferrite for type (i) glasses and maghemite for type (ii) glasses. The synchrotron radiation studies as well as the computer-assisted electron magnetic resonance provide an insight into the morphological characteristics of the magnetic nanoparticles in the glass.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Velikanov D. A., Zabluda V. N., Zubavichus Y., Veligzhanin A. A., Zaikovskiy V. I., Stepanov S., Artemenko A., Curely J., Kliava J.
Заглавие : Magnetic nanoparticles formed in glasses co-doped with iron and larger radius elements
Место публикации : J. Appl. Phys.: American Institute of Physics, 2012. - Vol. 112, Is. 8. - Ст.84331. - P. - ISSN 0021-8979, DOI 10.1063/1.4759244
Примечания : Cited References: 65. - This work was partly supported by the Russian Foundation for Basic Research, Grant Nos. 07-02-92174 RFBR-CNRS and 11-02-00972, and President of Russia Federation Grant No NSh 1044.2012.2. A. Artemenko acknowledges financial support from the Marie Curie International Incoming Fellowship within the 7th European Community Framework Programme (EPREXINA, GA 255662). The synchrotron measurements were supported via the Russian federal Contract No. 16.552.11.7003. The authors thank K. P. Polyakova for the preparation of thin films.
Предметные рубрики: SUPERPARAMAGNETIC RESONANCE
FERROMAGNETIC-RESONANCE
TEMPERATURE-DEPENDENCE
FERRITE NANOPARTICLES
OXIDE NANOPARTICLES
FARADAY-ROTATION
CERAMICS
ANISOTROPY
PARTICLES
SPECTRA
Аннотация: A new type of nanoparticle-containing glasses based on borate glasses co-doped with low contents of iron and larger radius elements, Dy, Tb, Gd, Ho, Er, Y, and Bi, is studied. Heat treatment of these glasses results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: x-ray diffraction, extended x-ray absorption fine structure, x-ray absorption near-edge structure, and small-angle x-ray scattering, show a broad distribution of nanoparticle sizes with characteristics depending on the treatment regime; a crystalline structure of these nanoparticles is detected in heat treated samples. Magnetic circular dichroism (MCD) studies of samples subjected to heat treatment as well as of maghemite, magnetite, and iron garnet allow to unambiguously assign the nanoparticle structure to maghemite, independently of co-dopant nature and of heat treatment regime used. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. The static magnetization in heat treated samples has non-linear dependence on the magnetizing field with hysteresis. Zero-field cooled magnetization curves show that at higher temperatures the nanoparticles occur in superparamagnetic state with blocking temperatures above 100 K. Below ca. 20 K, a considerable contribution to both zero field-cooled and field-cooled magnetizations occurs from diluted paramagnetic ions. Variable-temperature electron magnetic resonance (EMR) studies unambiguously show that in as-prepared glasses paramagnetic ions are in diluted state and confirm the formation of magnetic nanoparticles already at earlier stages of heat treatment. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by "direct" techniques as well as superparamagnetic nanoparticle behaviour demonstrated in the magnetization studies. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4759244]
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Пашков, Геннадий Леонидович, Сайкова С. В., Пантелеева М. В., Линок Е. В., Иванцов, Руслан Дмитриевич, Жижаев, Анатолий Михайлович
Заглавие : Синтез нанопорошка феррит-граната и изучение магнитооптических свойств композита на его основе
Место публикации : Изв. ВУЗов. Химия и хим. технол. - 2013. - Т. 56, № 8. - С. 77-81
Ключевые слова (''Своб.индексиров.''): железо-иттриевый гранат--анионит--синтез
Аннотация: Предложен способ получения нанопорошка железо-иттриевого граната методом поэтапного осаждения гидроксидов иттрия и железа (III) из хлоридных растворов сильноосновным анионитом AB-17-8 в OH-форме с последующим прокаливанием прекурсора при 700 С. Продукты исследовали методами рентгенофазового анализа, ИК-Фурье спектроскопии, электронной микроскопии, а также изучили магнитооприческое поведение нанокомпозита на основе этого порошка.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Петров, Дмитрий Анатольевич, Иванцов, Руслан Дмитриевич, Жарков, Сергей Михайлович, Гумаров Г. Г., Нуждин В. И., Валеев В. Ф., Степанов, Андрей Львович, Эдельман, Ирина Самсоновна
Заглавие : Экспериментальное исследование магнитного кругового дихроизма наночастиц Ni в SiO[[d]]2[[/d]], полученных методом ионной имплантации
Коллективы : Российская академия наук, Научный совет по физике конденсированных сред РАН, Институт физики твердого тела РАН, Московский государственный университет им. М.В. Ломоносова, Астраханский государственный университет , "Новое в магнетизме и магнитных материалах", международная конференция (22; 2012 ; сент. ; 17-23; Астрахань)
Место публикации : Новое в магнетизме и магнитных материалах : сборник трудов XXII международной конференции. - Астрахань, 2012. - С. 408-409
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Chun-Rong Lin, Shin-Zong Lu, Yu-Jhan Siao, Lyubutin I.S., Ivantsov R.D., Starchikov S.S., Funtov K.O., Ovchinnikov S. G., Edelman I.S.
Заглавие : Experimental study of iron sulfide Fe[[d]]3[[/d]]S[[d]]4[[/d]] nanoparticles synthesized by the polyolmediated process
Коллективы : Российская академия наук, Научный совет по физике конденсированных сред РАН, Институт физики твердого тела РАН, Московский государственный университет им. М.В. Ломоносова, Астраханский государственный университет , "Новое в магнетизме и магнитных материалах", международная конференция (22; 2012 ; сент. ; 17-23; Астрахань)
Место публикации : Новое в магнетизме и магнитных материалах : сборник трудов XXII международной конференции. - Астрахань, 2012. - С. 470-472
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Edelman I. S., Ivantsov R. D., Lin C. R., Ovchinnikov S. G.
Заглавие : Magneto-optics of transition metal halcogenido nanoparticles dispersed in transperant matrix : Abstract
Коллективы : "Functional Materials", International Conference , Taurida National V. I. Vernadsky University
Место публикации : Functional materials: Abstracts/ ed. V. N. Berzhansky. - Simferopol, 2013. - P.184. - ISBN 978-966-491-465-6
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11.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Velikanov D. A., Petrakovskaja E. A., Artemenko A., Curely J., Kliava J., Zaikovskiy V. I., Stepanov S.
Заглавие : Magnetic properties and morphology of manganese ferrite nanoparticles in glasses
Коллективы : Baltic Conference on Silicate Materials
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2011. - Vol. 25, Is. 1. - Ст.012017. - , DOI 10.1088/1757-899X/25/1/012017
Ключевые слова (''Своб.индексиров.''): average diameter--borate glass--co-doped--electron magnetic resonance--magnetic and magneto-optical properties--magnetic behaviour--magnetic circular dichroisms--magnetic nanoparticles--magnetically ordered material--manganese ferrite nanoparticles--manganese ferrites--morphological characteristic--paramagnetic ions--resonance field--size and shape--static magnetization--temperature dependence--temperature dependent--variable temperature--visible and near infrared--alumina--dichroism--ferrite--glass--iron oxides--magnetic properties--magnetic resonance--magnetocrystalline anisotropy--manganese--manganese oxide--nanoparticles--paramagnetism--silicates--spectroscopy--nanomagnetics
Аннотация: Static magnetization (SM), magnetic circular dichroism (MCD) and electron magnetic resonance (EMR) studies are reported of borate glasses 22.5 K 2O-22.5 Al 2O 3-55 B 2O 3 co-doped with iron and manganese oxides. In as-prepared glasses the paramagnetic ions usually are in diluted state; however, if the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles are found already in as-prepared glass. After additional thermal treatment all glasses show magnetic behaviour, MCD and EMR due to the presence of magnetic nanoparticles with characteristics close to those of manganese ferrite. By computer simulating the EMR spectra at variable temperatures, their morphological characteristics are deduced: relatively broad size and shape distribution with average diameter of ca. 3-4 nm. The characteristic temperature-dependent shift of the apparent resonance field is explained by a strong temperature dependence of the magnetocrystalline anisotropy in the nanoparticles. The potassium-alumina-borate glasses containing magnetic nanoparticles represent a novel class of materials: "transparent magnets". Indeed, they remain transparent in a part of visible and near infrared spectral range while showing magnetic and magneto-optical properties characteristic of magnetically ordered materials.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Petrakovskaja E. A., Velikanov D. A., Zabluda V. N., Hennet L., Thiaudiere D., Saboungi M.-L., Zubavichus Y. V., Veligzhanin A. A., Zaikovskiy V. I., Stepanov S., Curély J., Kliava J.
Заглавие : Transperant nanomagnetic materials based on borate glasses co-doped with iron, manganese and rare-earth elements
Коллективы : International Conference on Nanostructured Materials (11; 2012 ; August ; 26 – 31; Rhodes, Greece)
Место публикации : XI International Conference on Nanostructured Materials. - 2012. - P.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Trofimova N. N., Edelman I. S., Ivanova O. S., Ivantsov R. D., Petrakovskaja E. A., Velikanov D. A., Zabluda V. N., Zubavichus Y. V.
Заглавие : Structural investigation of glasses with magnetic nanoprecipitates
Коллективы : "Advanced Materials Design at X-ray and Neutron Facilities: Soft Matter and Nano Composites", RACIRI Summer School (2013 ; Aug. 17-25; Saint Petersburg, Russia)
Место публикации : RACIRI Summer School "Adv. Mater. Design at X-ray and Neutron Facilities: Soft Matter and Nano Composites": Book of abstracts. - St. Petersburg, 2013. - P.91-92. - ISBN 978-5-98340-315-4
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Диденко О. Н., Иванцов, Руслан Дмитриевич, Гребенькова, Юлия Эрнестовна
Заглавие : Интерфейсные слои в пленочных структурах Ni-Ge и их влияние на магнитные свойства образца
Коллективы : Ассоциация студентов-физиков и молодых ученых России, Северный (Арктический) федеральный университет имени М.В.Ломоносова, Российская академия наук, Уральское отделение РАН, Институт электрофизики УрО РАН, Архангельский научный центр УрО РАН, Всероссийская научная конференция студентов физиков и молодых ученых (19; 2013 ; 28 марта - 4 апр.; Архангельск)
Место публикации : Девятнадцатая Всерос. науч. конф. студ.-физиков и мол. учёных (ВНКСФ-19): матер. конф. - 2013. - С. 106–107
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Stepanov S., Zaikovskiy V. I.
Заглавие : Heat treatment stimulation of the magnetic nanoparticles formation in borate glasses doped with transition elements
Место публикации : Heat Treat.: Theory, Tech. and Appl.: Chapter. - New York: Nova Science Publishers, 2011. - P.225-239. - ISBN 978-161728348-2
Аннотация: Evolution of the magnetic nanoparticles characteristics in glasses of the system 22.5 Al2O3 - 22.5 K2O - 55 B2O3 co-doped with Fe2O3 and MnO simultaneous is studied at different stages of the post-synthesis heat treatment with transmission electron microscopy (TEM) images, selected area electron diffraction (SAED), energy dispersive X-ray analysis (EDAX), and magneto-optical Faraday rotation (FR). Heat treatment of the glasses results in substantial changes of their structure and properties: ferrite nanoparticles of different size, composition, and structure arise in glass matrices. For several series of glasses with the same composition and molar concentration of the paramagnetic additions, the heat treatment regimes (temperature and duration) have been shown to be the main factors controlling the particle size and the order in the crystallite arrangements. Ensembles of particles in theirs turn determine magnetic and magneto-optical properties of glass as a whole. A correlation between the characteristics of nanoparticles and the heat treatment regimes is discussed qualitatively.
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16.

Вид документа : Однотомное издание
Шифр издания : В37/И 23 рукописный текст
Автор(ы) : Иванцов, Руслан Дмитриевич
Заглавие : Магнитно-оптические и магнитные свойства нано-частиц феррита марганца в боратном стекле : дис. на соиск. уч. степени канд. физ.-мат. наук : 01.04.11 : защищена 26.12.2002
Выходные данные : Красноярск, 2002
Колич.характеристики :90 с
Коллективы : Российская академия наук, Сибирское отделение РАН, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Примечания : Библиогр.: 107 назв.
ГРНТИ : 29.19.41 + 29.19.37
ББК : В373.36я031
Экземпляры :ДС(1)
Свободны : ДС(1)
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lin C.-R., Tseng Y.-T., Ovchinnikov S. G., Ivantsov R. D., Edelman I. S., Fedorov A. S., Kuzubov A. A., Fedorov D. A., Starchikov S. S., Lyubutin I. S.
Заглавие : Fe3S4 and Fe3O4 magnetic nanocrystals: magnetooptical and Mössbauer spectroscopy study
Место публикации : Mater. Research Express. - 2014. - Vol. 1, Is. 2. - P.025033. - DOI 10.1088/2053-1591/1/2/025033
Примечания : We thank the National Science Council of Taiwan (NSC 100-2923-M-153-001-MY3 and NSC 102-2112-M-153-002-MY3) for financial support. Support by the Russian Foundation for Basic Research (Grants #14-12-00848 and 14-02-0121) is acknowledged. This work was also supported by the Russian Federation President Grant NSh-2886.2014.2.
Ключевые слова (''Своб.индексиров.''): iron sulfide fe3s4--iron oxide fe3o4--magnetic nanoparticles--mössbauer spectroscopy--magnetic circular dichroism--ab-initio band structure--calculations
Аннотация: Iron oxide magnetite (Fe3O4) should be a reasonable analog for conception and understanding of the magnetic properties of iron sulfide greigite (Fe3S4)—one of the most required magnetic materials having numerous applications but being far from the complete understanding now. We present here a comparative study of the Mössbauer effect (ME) and the magnetic circular dichroism (MCD) spectroscopy of Fe3O4 and Fe3S4 nanoparticles. The ME spectrum parameters of Fe3S4 are shown to distinguish strongly from that of Fe3O4, and the MCD spectrum shapes are shown to be absolutely different for two compounds. To clarify the origin of the Fe3S4 MCD spectrum we have performed ab initio band structure calculations and identified the MCD spectrum features with the transitions between calculated energy states.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Ivantsov R. D., Petrakovskaja E. A., Velikanov D. A., Trofimova N. N., Zubavichus Y. V.
Заглавие : Ensembles of γ-Fe2O3 nanoparticles formed during devitrification of borate glasses
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.173-178. - ISSN 978-303835054-5, DOI 10.4028/www.scientific.net/SSP.215.173. - ISSN 1662-9779
Примечания : Cited References: 16
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--magneto-optical properties
Аннотация: Structural, magnetic and magneto-optical properties of borate glasses co-doped with Fe and the lager radius ions are presented. Maghemite, ?-Fe2O3, nanoparticles arise in the glasses as a result of their thermal treatment in different regimes. Magnetization FC and ZFC temperature dependences demonstrate the superparamagnetic behavior of the particles with the blocking temperature below the room temperature. The EMR spectra measurements revealed a significant anisotropy with a large contribution of the nanoparticles' surface anisotropy. The FR maximum centered near 700 nm is a characteristic feature of the investigated glasses. © (2014) Trans Tech Publications, Switzerland.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov D. A., Edelman I. S., Ivantsov R. D., Zharkov S. M., Stepanov A. L.
Заглавие : Magneto-optics of cobalt and nickel nanoparticles implanted in SiO2: Comparative study
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: S. G. Ovchinnikov, A. Samardak: Trans Tech Publications, 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P.214-217. - ISSN 978-303835054-5, DOI 10.4028/www.scientific.net/SSP.215.214. - ISSN 1662-9779
Примечания : Cited References: 12
Ключевые слова (''Своб.индексиров.''): cobalt nanoparticles--high resolution electron microscopy--magnetic circular dichroism--nickel nanoparticles--surface plasmon resonance
Аннотация: Co and Ni nanoparticles were fabricated in fused silica plates by ion implantation technique. Electron microscopy showed the nanoparticles to be of spherical shape. Magnetic circular dichroism (MCD) was investigated in the spectral range 1.2-4.2 eV in a field of about 3 kOe. MCD spectra are considerably different from the spectra of thin nickel and cobalt films. MCD spectra for Ni nanoparticles are associated with surface plasmon resonance. © (2014) Trans Tech Publications, Switzerland.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivantsov R. D., Edelman I. S., Zharkov S. M., Velikanov D. A., Petrov D. A., Ovchinnikov S. G., Lin C.-R., Li O., Tseng Y.-T.
Заглавие : Effects of processing parameters on the morphology, structure, and magnetic properties of Cu1-xFexCr2Se4 nanoparticles synthesized with chemical methods
Место публикации : J. Alloys Compd.: Elsevier, 2015. - Vol. 650. - P.887-895. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2015.08.017
Примечания : Cited References: 36. - The paper was partially supported by the Russian Foundation for Basic Research (grant #14-02-01211), by the President of Russia (grant #NSh-2886.2014.2), and by the Ministry of Education and Science of the Russian Federation (grant #2014/71/1763 in the framework of the state assignment for the Siberian Federal University for 2014-2016). We also thank the Ministry of Science and Technology of Taiwan and the Siberian Branch of RAS (MOST 102-2112-M-153 -002 -MY3) for financial support.
Предметные рубрики: CuCr2Se4 SINGLE-CRYSTALS
TRANSPORT-PROPERTIES
CHROMIUM SPINELS
NANOSTRUCTURES
DIFFRACTION
Li
Ключевые слова (''Своб.индексиров.''): copper selenide--magnetic nanoparticles--visible magnetic circular dichroism
Аннотация: Cu1-xFexCr2Se4 nanoparticles with x = 0, 0.2, and 0.4 were synthesized via thermal decomposition of metal nitrate or chloride salts and selenium powder using different precursor compositions and processing details. Single crystalline nano-belts or nano-rods coexist in the synthesized powder samples with hexagon-shaped plates in dependence on the precursor composition. The belts gathered into conglomerates forming "hierarchical" particles. Visible magnetic circular dichroism (MCD) of Cu1-xFexCr2Se4 nanoparticles embedded into a transparent matrix was investigated for the first time. The similarity of the MCD spectra of all samples showed the similarity of the nanoparticles electronic structure independent of their morphology. Basing on the MCD spectral maxima characteristics, electron transitions from the ground to the excited states were identified with the help of the conventional band theory and the multi-electron approach. © 2015 Elsevier B.V.
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