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1.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Samatov O. M., Leiman D. V., Safronov A. P., Beketov I. V.
Заглавие
: Magnetic properties of
ferrite
nanoparticles fabricated by laser target evaporation
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации
: V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 62. - ISBN 978-5-7444-3124-2
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2.
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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3.
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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4.
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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5.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Trofimova N. N., Zubavichus Y. V., Edelman I. S., Ivanova O. S., Velikanov D. A., Petrakovskaya E. A., Zaikovskii V. I.
Заглавие
:
Ferrite
nanoparticles in borate glass matrix: structure and magnetic properties
Коллективы
: Московский государственный университет им. М.В. Ломоносова, Moscow International Symposium on Magnetism
Место публикации
: Moscow Int. Symp. on Magnet. (MISM-2014): Book of abstracts. - 2014. - Ст.2PO-I1-2. - P.745. - ISBN 978-5-91978-025-0
Book of abstracts
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6.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Edelman I. S., Ivanova O. S., Zubavichus Y., Trofimova N. N., Zaikovskiy V. I., Artemenko A., Curely J., Kliava J.
Заглавие
: Magnetic nanoparticles in borate glasses: Identification and sizing
Коллективы
: Russian Foundation for Basic Research, Russian Foundation for Basic Research, International Conference on Optimization of Electrical and Electronic Equipmen (22 May - 24 May 2014; Bran, Romania)
Место публикации
: International Conference on Optimization of Electrical and Electronic Equipment (OPTIM 2014): IEEE Computer Society, 2014. - P.95-104. - ISBN 978-1-4799-5183-3,
DOI
10.1109/OPTIM.2014.6850939
Примечания
: Cited References: 60
Предметные рубрики:
Engineering, Electrical and Electronic
Ключевые слова
(''Своб.индексиров.''): superparamagnetic resonance--ferromagnetic-resonance--
ferrite
nanoparticles--oxide nanoparticles--faraday-rotation--ceramics--iron--crystallization--anisotropy--particles
Аннотация:
Heat treatment of borate glasses co-doped with low contents of iron and larger radius elements: Dy, Tb, Gd, Ho, Er, Y and Bi results in formation of magnetic nanoparticles, radically changing their physical properties. Transmission electron microscopy and synchrotron radiation-based techniques: XRD, EXAFS, XANES and SAXS, show a broad distribution of nanoparticle sizes with characteristic 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 assigning the nanoparticle structure to maghemite. Different features observed in the MCD spectra are related to different electron transitions in Fe3+ ions gathered in the nanoparticles. Variable-temperature electron magnetic resonance (EMR) studies confirm the formation of magnetic nanoparticles and the identification of their nature. Computer simulations of the EMR spectra corroborate the broad distribution of nanoparticle sizes found by 'direct' techniques. © 2014 IEEE.
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7.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Popov M. A., Zavislyak I. V., Movchan N. N., Gudim, I. A., Srinivasan G.
Заглавие
: Mode splitting in 37-42 GHz barium hexaferrite resonator: Theory and device applications
Место публикации
: IEEE Trans. Magn.: IEEE-Institute Electrical and Electronics Engineers, 2014. - Vol. 50, Is. 6. - Ст.4004507. - ISSN 0018-9464,
DOI
10.1109/TMAG.2014.2298498. - ISSN 1941-0069
Примечания
: Cited References: 34
Предметные рубрики:
MILLIMETER-WAVE APPLICATIONS
GUIDE JUNCTION CIRCULATORS
FERRITE
MICROWAVE
PROPAGATION
CYLINDERS
Ключевые слова
(''Своб.индексиров.''): dielectric resonance--ferromagnetic resonance (fmr)--hexagonal
ferrite
--isolator--phase shifter
Аннотация:
Dielectric resonances in the 37-42 GHz frequency band in the single crystal barium hexaferrite that occur well below the ferromagnetic resonance (FMR) have been investigated. Sample dimensions have been chosen so that the mode frequency is lower than the spin-wave excitation (in this case, the natural domain resonance) frequency. Such dielectric mode frequencies, being a function of both permittivity and permeability, are magnetic field H tunable. Here, we report on below-FMR magnetodielectric resonance (MDR) axially magnetized barium hexaferrites and their H-tuning characteristics. Our studies reveal H-tuning by up to 2.5 GHz and the tuning is the largest when the
ferrite
is in a magnetically unsaturated state. A theory for the MDR is presented and a fairly good agreement between experimental data and theory has been obtained. Tunable millimeter wave phase shifters and isolators utilizing the below-FMR dielectric resonances have been demonstrated.
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Patrusheva T. N., Podorojnyak S. A., Polyakova K. P., Kirik S. D., Menshikov V. V., Levchenko S. I., Patrushev V. V., Adrianova M. A., Gerasimova G. E.
Заглавие
: Manufacturing solution for producing cobalt-
ferrite
films
Место публикации
: Chem. Mater. Eng. - 2014. - Vol. 2(2). - P.33 - 36. -
DOI
10.13189/cme.2014.020202
Аннотация:
An extraction-pyrolytic technique and its usage for obtaining pure products from secondary manufacturing solutions are considered in this paper. Nanostructure
ferrite
thin films were prepared using the extraction-pyrolytic technique. It was shown that the extraction from modeling liquid of waste solution allows obtaining the pure single phase product. Fe2CoO4 magnetic films with grain sizes 18–20 nm were obtained by cycling pyrolysis of wet films deposited by the spin coating technique.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Киренский, Леонид Васильевич, Галепов, Павел Степанович, Турпанов, Игорь Александрович
Заглавие
: Получение тонких ферритовых пленок в плазме инертного газа
Место публикации
: Кристаллография. - 1966. - т. 11, Вып. 2. - С. 346-348
Примечания
: Библиогр.: 17 назв. - Phys. Abstr. - 1966. - Vol. 69, 37053
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10.
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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11.
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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12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Belyaev B. A., Lemberg K. V., Serzhantov, Alexey M., Leksikov Al. A., Bal'va Y. F., Leksikov An. A.
Заглавие
: Magnetically tunable resonant phase shifters for UHF band
Коллективы
: Ministry of Education and Science of the Russian Federation [3.528.2014K]
Место публикации
: IEEE Trans. Magn.: IEEE-Institute Electrical and Electronics Engineers, 2015. - Vol. 51, Is. 6. - Ст.4003205. - ISSN 0018,
DOI
10.1109/TMAG.2014.2368513. - ISSN 19410069(eISSN)
Примечания
: Cited References:22. - This work was supported by the Ministry of Education and Science of the Russian Federation, task no. 3.528.2014K.
Предметные рубрики:
FERROMAGNETIC-RESONANCE
COMPACT
SPECTROMETER
FERRITE
FILMS
LINE
Ключевые слова
(''Своб.индексиров.''):
ferrite
--microstrip structure--microwave--tunable phase shifter
Аннотация:
This paper presents a new type of magnetically tunable phase shifter. The shifter has the structure of microstrip bandpass filter on a substrate containing magnetic material whose magnetic permeability is controlled by magnetic field due to ferromagnetic resonance. The phase shifter's operation is based on the fact that phase shift in a bandpass filter changes with tuning of its central frequency. Two types of devices were designed and fabricated for the UHF band. One of them has a five-layer NiFe film as an active medium and demonstrates a figure of merit of 40°/dB achieved already at 20 Oe of the controlling magnetic field in 10% of the relative operational bandwidth. The second device with YIG
ferrite
as an active medium gave 360° tunable phase shift in 5% operational bandwidth that corresponds to the figure of merit of 150°/dB (3.1°/dB·Oe).
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pachauri, Neha, Khodadadi B., Althammer M., Singh A.V., Loukya B., Datta R., Iliev M., Bezmaternykh L. N., Gudim I. A., Mewes T., Gupta A.
Заглавие
: Study of structural and ferromagnetic resonance properties of spinel lithium
ferrite
(LiFe5O8) single crystals
Коллективы
: NSF [ECCS-1102263], NSF-CAREER [0952929], ICMS
Место публикации
: J. Appl. Phys.: American Institute of Physics, 2015. - Vol. 117, Is. 23. - Ст.233907. - ISSN 0021,
DOI
10.1063/1.4922778. - ISSN 10897550(eISSN)
Примечания
: Cited References:32. - This work has been supported by NSF Grant No. ECCS-1102263. Tim Mewes and Behrouz Khodadadi would like to acknowledge support by the NSF-CAREER Award No. 0952929. R. Datta and B. Loukya sincerely acknowledge ICMS for providing advanced microscopy facility and funding. We thank Sahar Keshavarz, Archana Panikar, Stefan Kingler, and Jamileh Beik Mohammadi for help with the experimental work.
Предметные рубрики:
EFFECTIVE LINEWIDTH
MAGNETIC-PROPERTIES
FIELD
TEMPERATURE
DEPENDENCE
Аннотация:
The effect of B-site cation ordering on the room temperature structural and ferromagnetic resonance (FMR) properties of single crystal spinel lithium
ferrite
(LiFe5O8, LFO) have been investigated. A detailed microstructural analysis is done through X-ray diffraction, polarized Raman spectroscopy, and transmission electron microscopy (TEM) to examine the effect of post-annealing on the B-site cation ordering. The X-ray diffraction pattern of the as-grown crystal indicates a disordered state of the crystal. However, the annealed sample shows additional superlattice reflections corresponding to the ordered phase. This ordering is further confirmed by Raman spectra and TEM images, which reveal ordering of Li and Fe ions at the octahedral sites contrasting with the relatively high degree of octahedral site disorder in the as-grown crystal. To study the effect of B-site ordering on the magnetic properties and FMR linewidth, vibrating sample magnetometry and broadband FMR measurements have been performed for both the ordered and disordered phases of lithium
ferrite
. The value of saturation magnetization for both phases is ∼290 emu/cm3. A single mode FMR profile is observed for both phases with little distortion. The linewidth characteristics of the ordered and disordered phases of lithium
ferrite
phases are compared, and it is observed that the linewidth is independent of the cation ordering. Both the phases exhibit a low linewidth (∼26 Oe at 30 GHz) and the effective damping parameter for the as-grown and annealed samples is determined to be 0.0021 ± 0.0001.Влияние катионного упорядочения в Б-позициях при комнатной температуре на структурные свойства и ферромагнитный резонанс (ФМР) монокристалла литий железной шпинели (LiFe5O8, LFO) были исследованы. Подробный анализ микроструктуры делается с использованием рентгеновской дифракции, спектроскопии комбинационного рассеяния поляризованного света и просвечивающей электронной микроскопии (ПЭМ), чтобы изучить влияние после отжига на катионное упорядочение в B-позиции. Рентгеновская дифракционная картина, так выращенных кристаллов указывает на беспорядочное состояние кристалла. Тем не менее, пример показывает дополнительные индексы, соответствующие сверхрешетчатой упорядоченной фазы, при отжиге. Этот порядок подтверждается также спектрами комбинационного рассеяния и ТЕМ изображений, которые показывают порядок ионов Li и Fe в октаэдрических контрастными с относительно высокой степенью восьмигранной расстройства позиций в выращенных кристаллах. Для изучения влияния упорядочения В-позиций на магнитные свойства и ширины линии ФМР, вибрационные образцы магнитометрии и широкополосных ФМР измерений были выполнены как для упорядоченных и неупорядоченных фаз литиевого феррита. Значение намагниченности насыщения для обоих фаз ~290 emu / см3. Одиночный профиль в режиме ФМР наблюдается для обеих фаз с небольшим искажением. Ширина линии характеристики упорядоченной и неупорядоченной фаз литиевых ферритов сравниваются, и следует отметить, что ширина линии не зависит от катионного упорядочения. Оба фазы проявляют малую ширину линии (Э около 26 на 30 ГГц) и эффективный параметр демпфирования, как, для только выращенных, так и для отожженных образцов, определяется как 0,0021 ± 0,0001.
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Li O. A., Lin C. -R., Chen H. -Y., Hsu, Hua-Shu, Shih K. -Y., Edelman I. S., Wu K. -W., Tseng Y. -T., Ovchinnikov S. G., Lee J. -S.
Заглавие
: Size dependent magnetic and magneto-optical properties of Ni0.2Zn0.8Fe2O4 nanoparticles
Место публикации
: J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 408. - P.206-212. - ISSN 03048853 (ISSN),
DOI
10.1016/j.jmmm.2016.02.062
Примечания
: Cited References: 51. - This work is supported by the Ministry of Science and Technology of Taiwan (MOST 103-2811-M-153 -001 and MOST 102-2112-M-153 -002 -MY3), and by the Russian Foundation for Basic Researches, grant No 14-02-01211.
Предметные рубрики:
Zinc
ferrite
Cation distribution
Sol-gel
Ni
ZnFe2O4
Spinel
Fe3O4
Particles
Spectra
State
Ключевые слова
(''Своб.индексиров.''): nickel zinc
ferrite
--nanoparticles--magnetic properties--mcd
Аннотация:
Ni0.2Zn0.8Fe2O4 spinel nanoparticles have been synthesized by combustion method. Average particles size varies from 15.5 to 50.0 nm depending on annealing temperature. Correlations between particles size and magnetic and magneto-optical properties are investigated. Magnetization dependences on temperature and external magnetic field correspond to the sum of paramagnetic and superparamagnetic response. Critical size of single-domain transition is found to be 15.9 nm. Magnetic circular dichroism (MCD) studies of nickel zinc spinel are presented here for the first time. The features in magnetic circular dichroism spectrum are assigned to the one-ion d-d transitions in Fe3+ and Ni2+ ions, as well to the intersublattice and intervalence charge transfer transitions. The MCD spectrum rearrangement was revealed with the change of the nanoparticles size. © 2016 Elsevier B.V. All rights reserved.
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Polyakova K. P., Polyakov V. V., Seredkin V. A., Patrin G. S.
Заглавие
: Magneto-optical properties of polycrystalline CoCrFeO4 films
Разночтения заглавия
:авие SCOPUS: Magneto-optical properties of polycrystalline CoCrFeO 4 films
Место публикации
: Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 37, Is. 2. - P109-111. - ISSN 1063-7850,
DOI
10.1134/S1063785011020118
Примечания
: Cited References: 9
Предметные рубрики:
THIN-FILMS
FERRITE
Аннотация:
A methods of obtaining polycrystalline CoCrFeO4 films based on solid-phase reactions in Cr2O3/Co/Fe layer structures in the regimes of isothermal annealing and self-propagating high-temperature synthesis (SHS) is described. The magneto-optical properties of the obtained films have been studied. It is established that the spectra of magneto-optical characteristics depend on the solid-phase reaction regime and synthesis temperature. The Faraday rotation angle exhibits a local maximum (2 theta(F) = 5 deg/mu m) at a wave-length of 630 nm.
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kliava J., Edelman I. S., Ivanova O. S., Ivantsov R. D., Bayukov O. A., Petrakovskaja E. A., Zaikovskiy V., Bruckental I., Yeshurun Y., Stepanov S.
Заглавие
: Formation and evolution of magnetic nanoparticles in borate glass simultaneously doped with Fe and Mn oxides
Коллективы
:
Место публикации
: J. Appl. Phys.: AMER INST PHYSICS, 2008. - Vol. 104, Is. 10. - Ст.103917. - ISSN 0021-8979,
DOI
10.1063/1.3021289
Примечания
: Cited References: 37. - A financial support from the Russian Foundation for Basic Research (RFBR)-CNRS (Grant No. 07-02-92174) is highly appreciated. R. Ivantsov is grateful to the Russian Science Support Foundation. Y. Yeshurun acknowledges the support of the Israel Scienc Foundation (ISF).
Предметные рубрики:
COBALT
FERRITE
PARTICLES
SUPERPARAMAGNETIC RESONANCE
GAMMA-FE2O3 NANOPARTICLES
MATRIX
SIZE
SYSTEMS
Ключевые слова
(''Своб.индексиров.''): aluminium compounds--borate glasses--coercive force--faraday effect--heat treatment--iron compounds--magnetic hysteresis--magnetic particles--magnetic susceptibility--manganese compounds--mossbauer effect--nanoparticles--paramagnetic materials--potassium compounds--remanence--superparamagnetism--transmission electron microscopy--x-ray chemical analysis--atomic spectroscopy--auger electron spectroscopy--crystal structure--electric relays--electronic medical equipment--
ferrite
--ferrites--glass--heat treatment--hysteresis--hysteresis loops--magnetic properties--magnetic resonance measurement--magnetic susceptibility--magnetism--manganese--manganese compounds--molybdenum--nanoparticles--optical properties--ozone water treatment--polydispersity--superparamagnetism--borate glasses--concentration ratios--electron magnetic resonances--emr spectrums--experimental techniques--faraday rotations--glass compositions--glass matrixes--glass preparations--magnetic measurements--magnetic nano particles--magnetic orders--magnetically ordered systems--magneto-optical properties--manganese ferrites--mean diameters--mn oxides--phase states--polydisperse nanoparticles--remnant magnetizations--ssbauer spectroscopies--superparamagnetic--superparamagnetic states--thermal treatments--variable temperatures--magnetic materials
Аннотация:
Evolution of the phase state of paramagnetic additions at various stages of synthesis and subsequent thermal treatment of glasses of the system Al(2)O(3)-K(2)O-B(2)O(3) simultaneously doped with Fe(2)O(3) and MnO is studied by means of a combination of experimental techniques: Faraday rotation (FR), electron magnetic resonance (EMR), transmission electron microscopy (TEM), Mossbauer spectroscopy, and magnetic measurements. Both FR and EMR show that magnetically ordered clusters occur already at the first stage of the glass preparation. In particular, for the ratio of the Fe and Mn oxides in the charge close to 3:2, fine magnetic nanoparticles are formed with characteristics similar to those of manganese
ferrite
. By computer simulating the EMR spectra at variable temperatures, a superparamagnetic nature of these nanoparticles is confirmed and their mean diameter is estimated as approximately 3.2 nm. In the thermally treated glasses larger magnetic nanoparticles are formed, giving rise to FR spectra, characteristic of magnetically ordered systems, and the EMR spectra different from those in as-prepared glasses but also showing superparamagnetic narrowing. The Mossbauer spectroscopy corroborates the manganese
ferrite
structure of the nanoparticles and indicates their coexistence in the ferrimagnetic and superparamagnetic states. The TEM shows the presence of polydisperse nanoparticles on the background of the glass matrix, and electron diffraction of a selected region containing larger particles indicates a crystal structure close to that of MnFe(2)O(4). Energy-dispersive atomic x-ray spectra confirm that the major part of Fe and Mn introduced to the glass composition is gathered in the particles, with the concentration ratio close to 2:1, characteristic of bulk MnFe(2)O(4). Magnetic hysteresis loops of samples subjected to an additional thermal treatment demonstrate a strong increase in the coercive force, remnant magnetization, and high-field magnetic susceptibility with temperature decrease. The consistent results obtained using various techniques demonstrate that the formation of nanoparticles with characteristics close to those of MnFe(2)O(4) confers to these glasses magnetic and magneto-optical properties typical of substances possessing magnetic order.
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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Lepeshev A. A., Saunin V. N., Telegin S. V., Polyakova K. P., Seredkin V. A., Polsky A. I.
Заглавие
:
Ferrite
and high-temperature superconductor targets for sputtering
Место публикации
: Tech. Phys.: AMER INST PHYSICS, 2000. - Vol. 45, Is. 5. - P653-655. - ISSN 1063-7842,
DOI
10.1134/1.1259696
Примечания
: Cited References: 6
Аннотация:
A method is described of preparing targets for sputtering, which involves the use of plasma deposition of respective powders onto a cooled metal plate. It is demonstrated that the use of plasma technology enables one to produce, in a controlled atmosphere, intricately shaped ceramic targets characterized by a highly uniform composition and by reliable mechanical and thermal contact of the resultant coating with the holder plate. Experiments are performed on the sputtering of targets to prepare polycrystalline
ferrite
films for magnetooptical applications and epitaxial films of high-temperature superconductors. (C) 2000 MAIK "Nauka/Interperiodica".
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18.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pparshin A. S., Chistyakov N. S.
Заглавие
: Spin-wave resonance in thin monocrystalline iron-manganese
ferrite
films
Место публикации
: Phys. Status Solidi B. - 1982. - Vol. 112, Is. 2. - P.K89-K92. - ISSN 0370-1972,
DOI
10.1002/pssb.2221120249
Примечания
: Cited References: 7
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19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Patrusheva T. N., Balaev D. A., Denisova E. A., Ponomarenko I. V.
Заглавие
: Cobalt
ferrite
nanoparticles in a mesoporous silicon dioxide matrix
Коллективы
: Development of the Scientific Potential of Higher Education [RNP. 2.1.1/2584]; Krasnoyarsk Regional Science Foundation; Russian Foundation for Basic Research [r-Enisei-a 03-07-96803, 09-02-98002-r_sibir'_a]
Место публикации
: Tech. Phys. Lett. - 2009. - Vol. 35, Is. 10. - P.882-884. - ISSN 1063-7850,
DOI
10.1134/S1063785009100022
Примечания
: Cited References: 10. - This study was supported in part by the Federal Program "Development of the Scientific Potential of Higher Education" (project no. RNP. 2.1.1/2584) and jointly by the Krasnoyarsk Regional Science Foundation and the Russian Foundation for Basic Research (project nos. r-Enisei-a 03-07-96803 and 09-02-98002-r_sibir'_a).
Предметные рубрики:
MAGNETIC-PROPERTIES
NANOSIZED COFE2O4
ANISOTROPY
POWDERS
CURVES
Аннотация:
We have studied magnetic nanoparticles of cobalt
ferrite
obtained by the extraction-pyrolysis method in a mesoporous silicon dioxide (MSM-41) molecular sieve matrix. The X-ray diffraction data show evidence for the formation of CoFe(2)O(4) particles with a coherent scattering domain size of similar to 40 nm. Measurements of the magnetization curves showed that powders consisting of these nanoparticles are magnetically hard materials with a coercive field of H (c)(4.2 K) = 9.0 kOe and H (c)(300 K) = 1.8 kOe and a reduced remanent magnetization of M (r)/M (s)(4.2 K) = 0.83 and M (r)/M (s)(300 K) = 0.49. The shape of the low-temperature (4.2 K) magnetization curves is adequately described in terms of the Stoner-Wohlfarth model for randomly oriented single-domain particles with a cubic magnetic anisotropy.
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Bayukov O. A., Petrakovskii G. A., Sablina K. A., Savitskii A. F.
Заглавие
: Mossbauer study of copper
ferrite
Место публикации
: Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 37, Is. 8. - P.2409-2412. - ISSN 0367-3294
Примечания
: Cited References: 9
Предметные рубрики:
CU-ZN
FERRITE
WOS
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