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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) : Князев, Юрий Владимирович, Иванова, Наталья Борисовна, Баюков, Олег Артемьевич, Казак, Наталья Валерьевна, Безматерных, Леонард Николаевич, Васильев, Александр Дмитриевич
Заглавие : Эволюция мессбауэровских спектров людвигита Co3-xFexО2BO3 при замещении кобальта железом
Место публикации : Физ. тверд. тела. - 2013. - Т. 55, Вып. 6. - С. 1088-1092
Примечания : Работа вып. при поддержке грантов РФФИ № 12-02-00175-а12-02-90410-Укр-а12-02-31543-мол-агранта Президента НШ-1044.2012.2программы СО РАН № 38Фед. целевой прогр. ”Науч. и науч.-пед. кадры инновационной России 2009−2013 гг."
Аннотация: Синтезирован концентрационный ряд монокристаллов железо-кобальтовых людвигитов Co3-xFexO2BO3 (x= 0.0125, 0.025, 0.050, 0.10, 1.0). Проведены структурные исследования с помощью рентгеновской дифракции и эффекта Мессбауэра. Обнаружен предпочтительный характер заселения железом неэквивалентных кристаллографических позиций в структуре людвигита. Определена валентность замещающих ионов железа, равная трем. Для Co2FeO2BO3 выявлено усложнение структуры gamma-резонансного спектра, обусловленное композиционным беспорядком в системе.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Safronov A. P., Beketov I. V., Komogortsev S. V., Kurlyandskaya G. V., Medvedev A. I., Leiman D. V., Larranaga A., Bhagat S. M.
Заглавие : Spherical magnetic nanoparticles fabricated by laser target evaporation
Место публикации : AIP Adv.: American Institute of Physics, 2013. - Vol. 3, Is. 5. - Ст.052135. - P. - ISSN 2158-3226, DOI 10.1063/1.4808368
Примечания : Cited References: 47. - This work was supported by the RFBR 10-02-96015 and 12-02-31385 projects, UrFU 215, Spanish MEC MAT2011-27573-C04 grants, Universidad del Pais Vasco UPV/EHU under UFI11/53 action and Physics Department of the University of Maryland visiting grant. Selected measurements were performed at SGIker service of UPV-EHU. We thank O.M. Samatov, Dr. A.M. Murzakayev, Dr. I. Orue, and A.A. Svalova for special support.
Предметные рубрики: IRON-OXIDE NANOPOWDERS
CO2-LASER EVAPORATION
FE3O4 NANOPARTICLES
FINITE-SIZE
TEMPERATURE
FERROMAGNETS
FERROFLUIDS
DEPENDENCE
EXPLOSION
PARTICLES
Аннотация: Magnetic nanoparticles of iron oxide (MNPs) were prepared by the laser target evaporation technique (LTE). The main focus was on the fabrication of de-aggregated spherical maghemite MNPs with a narrow size distribution and enhanced effective magnetization. X-ray diffraction, transmission electron microscopy, magnetization and microwave absorption measurements were comparatively analyzed. The shape of the MNPs (mean diameter of 9 nm) was very close to being spherical. The lattice constant of the crystalline phase was substantially smaller than that of stoichiometric magnetite but larger than the lattice constant of maghemite. High value of M-s up to 300 K was established. The 300 K ferromagnetic resonance signal is a single line located at a field expected from spherical magnetic particles with negligible magnetic anisotropy. The maximum obtained concentration of water based ferrofluid was as high as 10g/l of magnetic material. In order to understand the temperature and field dependence of MNPs magnetization, we invoke the core-shell model. The nanoparticles is said to have a ferrimagnetic core (roughly 70 percent of the caliper size) while the shell consists of surface layers in which the spins are frozen having no long range magnetic order. The core-shell interactions were estimated in frame of random anisotropy model. The obtained assembly of de-aggregated nanoparticles is an example of magnetic nanofluid stable under ambient conditions even without an electrostatic stabilizer. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Antonova A. B., Chudin O. S., Vasiliev A. D., Rubaylo A. I., Verpekin V. V., Sokolenko W. A., Pavlenko N. I., Semeikin O. V.
Заглавие : Chemistry of vinylidene complexes. XX. Intramolecular carbonylation of vinylidene on the MnFe center: Spectroscopic and structural study. X-ray structure of the new trimethylenemethane type MnFe complex
Место публикации : J. Organomet. Chem.: Elsevier, 2011. - Vol. 696, Is. 4. - P.963-970. - ISSN 0022-328X, DOI 10.1016/j.jorganchem.2010.10.035
Примечания : Cited References: 52. - This work was partially supported by the Presidium of the Russian Academy of Sciences (Program for Basic Research, Project No. 7.18) and Russian Foundation for Basic Research (Grant No. 09-03-90745-mob_st). Authors are grateful to Prof. N.A. Ustynyuk for useful discussions, Dr. E.A. Shor and Dr. A.M. Shor for giving the data of quantum chemical study.
Предметные рубрики: MOLECULAR-STRUCTURE
ORGANOMETALLIC CHEMISTRY
TRICARBONYL COMPLEXES
UNSATURATED CARBENES
METAL VINYLIDENES
TRANSITION-METALS
ORGANIC-SYNTHESIS
CRYSTAL-STRUCTURE
IRON TRICARBONYL
MANGANESE
Ключевые слова (''Своб.индексиров.''): manganese--iron--carbonyl complexes--heteronuclear vinylidene complexes--intramolecular vinylidene carbonylation--trimethylenemethane complexes
Аннотация: Reactions of Fe-2(CO)(9) with Cp(CO)(2)Mn=C=CHPh (1) and Cp(CO)(PPh3)Mn=C=CHPh (3) gave the heterometallic trimethylenemethane complexes eta(4)-{C[Mn(CO)(2)Cp](CO)CHPh}Fe(CO)(3) (2) and eta(4)-{C[Mn(CO)(PPh3)Cp](CO)CHPh}Fe(CO)(3) (4), respectively. The formation of the benzylideneketene [PhHC=C=C=O] fragment included in complexes 2 and 4 occurs via intramolecular coupling of the carbonyl and vinylidene ligands. The structures of 3 and 4 were determined by single crystal XRD methods. The influence of the nature of the L ligands at the Mn atom on the structural and spectroscopic characteristics of eta(4)-{C[Mn(CO)(L)Cp](CO)CHPh}Fe(CO)(3) (L = CO (2), PPh3 (4)) is considered. According to the VT H-1 and C-13 NMR spectra, complex 2 reversibly transforms in solution into mu-eta(1):eta(1)-vinylidene isomer Cp(CO)(2)MnFe(mu-C=CHPh)(CO)(4) (2a), whereas complex 4 containing the PPh3 ligand is not able to a similar transformation. (C) 2010 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boldyrev K. N., Stanislavchuk T. N., Klimin S. A., Popova M. N., Bezmaternykh L. N.
Заглавие : Terahertz spectroscopy of multiferroic EuFe3(BO3)4
Место публикации : Phys. Lett. A: Elsevier Science BV, 2012. - Vol. 376, Is. 37. - P.2562-2564. - ISSN 0375-9601, DOI 10.1016/j.physleta.2012.06.028
Примечания : Cited References: 19. - This work was partially supported by the Russian Foundation for Basic Research under Grants No. 10-02-01071-a and No. 09-02-00171-a, by the Ministry of Education and Science under Grant HIII-4828.2012.2, and by the Russian Academy of Sciences under the programs for basic research.
Предметные рубрики: SINGLE-CRYSTAL
GDFE3(BO3)4
Ключевые слова (''Своб.индексиров.''): terahertz spectroscopy--multiferroics--europium iron borate
Аннотация: The terahertz spectra of a rare-earth iron borate with the huntite structure are obtained for the first time. We study the low-temperature (4.0–90 K) α-polarized transmittance spectra of the EuFe3(BO3)4 single crystal in the region 0.9–6.0 THz. Pronounced shifts of phonon frequencies and appearance of new phonon modes at the temperature T S = 58 K of the R 32 → P 3 1 21 structural phase transition are observed. Additional shifts of phonon frequencies occur at the temperature T N = 34 K of the magnetic ordering of the Fe subsystem, thus evidencing the spin–phonon coupling in this multiferroic material.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Lvaschenko S. A., Tarasov I. A., Varnakov S. N., Shevtsov D. V., Shvets V. A., Zabluda V. N., Ovchinnikov S. G., Kosyrev N. N., Bondarenko G. V., Rykhkitskii S. V., Latyshev A. V., Saranin A. A.
Заглавие : The in situ magneto ellipsometry method in the study magnetooptical properties of the iron thin films
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 105. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Togushova Yu. N., Eremin I.
Заглавие : Three-orbital model for Fe-pnictides
Место публикации : J. Supercond. Nov. Magn. - 2013. - Vol. 26, Is. 8. - P.2665-2668. - ISSN 1557-1939, DOI 10.1007/s10948-013-2156-x
Ключевые слова (''Своб.индексиров.''): fe-based superconductors--low-energy model--spin susceptibility--fe-based superconductors--iron-based superconductors--pairing interactions--spin susceptibility--high temperature superconductors--magnetic susceptibility--superconductivity
Аннотация: We formulate and study the three-orbital model for iron-based superconductors. Results for the band structure, Fermi surface, and the spin susceptibility in both normal and superconducting s В± states are presented. We also discuss the pairing interaction and show that the dominant part of it should come from the intraorbital scattering. В© 2013 Springer Science+Business Media New York.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Беляев, Борис Афанасьевич, Изотов, Андрей Викторович
Заглавие : Микромагнитный расчет магнитостатических мод колебаний ортогонально намагниченного диска железо-иттриевого граната
Место публикации : Физ. тверд. тела: Физико-технический институт им. А.Ф.Иоффе РАН, 2013. - Т. 55, Вып. 12. - С. 2370-2378. - ISSN 0367-3294
Примечания : Работа выполнена при финансовой поддержке Министерства образования и науки РФ (государственный контракт N 14.513.11.0010), Федеральной целевой программы "Научные и научно-педагогические кадры инновационной России (2009-2013 гг.)" и интеграционного проекта СО РАН N 109.
Аннотация: В диапазоне частот 0.0001-100 MHz исследовано поведение спектров импеданса островковых пермаллоевых пленок, полученных вакуумным напылением на оптически полированные подложки из ситалла. Разработана резистивно-емкостная модель пленок и определены ее параметры, для которых наблюдается хорошее согласие с экспериментальными результатами частотных зависимостей действительной и мнимой компонент импеданса. Изучены закономерности в поведении электрофизических характеристик при изменении толщины образцов и величины зазора между измерительными электродами. Определены величины относительной диэлектрической проницаемости исследуемых пленок, достигающие значений varepsilon~ 10˄7-10˄8, и вычислены времена релаксации структуры.
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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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Varnakov S. N., Satsuk S. A., Yakovlev I. A., Ovchinnikov S. G.
Заглавие : Magnetic anisotropy in Fe films deposited on SiO2/Si(001) and Si(001) substrates
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2014. - Vol. 351. - P.104-108. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2013.09.058. - ISSN 873-4766
Примечания : Cited References: 40. - The work has been supported by RFBR Grant 11-03-00168-a, 12-02-00943-a, 13-02-01265-a, Interdisciplinary integration of fundamental research of SB RAS (2012-2014) project No. 64. Also the study was supported by The Ministry of Education and Science of Russian Federation, project 14.513.11.0016.
Предметные рубрики: UNIAXIAL ANISOTROPY
SURFACE
SILICON
ROUGHNESS
Ключевые слова (''Своб.индексиров.''): epitaxial growth--iron--magnetic anisotropy--thin film
Аннотация: The magnetic anisotropy of 10 nm iron films deposited in an ultra high vacuum on the Si(001) surface and on the Si(001) over caped by 1.5 nm layer of SiO2 was investigated. There is in-plane uniaxial magnetic anisotropy caused by oblique sputtering in the Fe films on a SiO2 buffer layer. The easy magnetization axis is always normal to the atomic flux direction but the value of the anisotropy field is different depending on the axial angle among sputtering direction and the substrate crystallographic axes. It is argued that the uniaxial magnetic anisotropy results from elongated surface roughness formation during film deposition. Several easy magnetization axes are found in Fe/Si(001) film without the SiO2 buffer layer. The mutual orientation of the main easy axes and Si crystallographic axes indicates that there is epitaxial growth of Fe/Si(001) film with the following orientation relative to the substrate: Fe[100] ?Si[110]. The anisotropy energy of Fe/Si(001) film is estimated by simulation of angle dependence of remnant magnetization m r as the sum of the mr angle plot from uniaxial anisotropy (induced by oblique deposition) and the polar plot from biaxial magnetocrystalline anisotropy. В© 2013 Elsevier B.V.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Ivanova N. B., Bayukov O. A., Kazak N. V., Bezmaternykh L. N., Vasiliev A. D.
Заглавие : Evolution of the mossbauer spectra of ludwigite Co3-xFexO2BO3 with substitution of iron for cobalt
Место публикации : Phys. Solid State. - 2013. - Vol. 55, Is. 6. - P.1175-1179. - ISSN 1063-7834, DOI 10.1134/S1063783413060176
Аннотация: A concentration series of single crystals of iron-cobalt ludwigites Co3-xFexO2BO3 (x = 0.0125, 0.025, 0.050, 0.10, 1.0) has been synthesized. The structure has been studied using X-ray diffraction and Mossbauer effect. A preferred occupation of nonequivalent crystallographic positions by iron in the ludwigite structure has been revealed. It has been found that the valence of substituting iron ions is three. It has been revealed that the structure of the ?-resonance spectrum of Co2FeO2BO3 is complicated due to a composition disorder in the system. В© 2013 Pleiades Publishing, Ltd.
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12.

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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13.

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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Якубайлик, Эдуард Константинович, Килин В. И., Чижик, Михаил Владимирович, Ганженко И. М., Килин С. В.
Заглавие : Магнитные характеристики первичных концентратов руд – сырья Абагурской фабрики
Место публикации : Физ.-техн. проблемы разраб. полез. ископаемых. - 2013. - № 1. - С. 170-176. - ISSN 0015-3273
Ключевые слова (''Своб.индексиров.''): первичный концентрат--магнетитовые--слабоокисленные руды--магнитные характеристики--prime concentrate--black iron ore--lightly-oxidized ore--magnetic properties
Аннотация: Работа содержит результаты измерений основных магнитных характеристик девяти первичных концентратов магнетитовых и слабоокисленных руд железорудных месторождений Сибири — сырья Абагурской фабрики. Наибольшими значениями магнитных параметров обладают магнетитовые промпродукты Абазы, Ирбы, Каза; наименьшими — слабоокисленные Изых-Гола, Краснокаменска; значения характеристик пропорциональны содержанию магнетита в исходной пробе. Учитывая это, слабоокисленные руды необходимо обогащать совместно с магнетитовыми для снижения потерь магнетита в хвосты.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Якубайлик, Эдуард Константинович, Килин В. И., Килин С. В., Ганженко И. М.
Заглавие : Магнитные свойства и процессы мокрой магнитной сепарации первичных концентратов железосодержащих руд Сибири
Место публикации : Горный информационно-аналитический бюллетень. - 2013. - № 2. - С. 114-124. - ISSN 0236-1493
Ключевые слова (''Своб.индексиров.''): magnetic characteristics--primary concentrate--magnetite--oxidic ores--wet separation--separation parameters obtained--магнитные параметры--первичный концентрат--магнетитокисленные руды--мокрая сепарация--показатели обогащения
Аннотация: Изложены результаты изучения основных магнитных характеристик и показателей лабораторной мокрой сепарации девяти первичных концентратов магнетитовых и слабоокисленных руд сибирских месторождений — сырья Абагурской обогатительной фабрики. Рекомендовано слабоокисленные руды обогащать в обшей шихте с магнетитовыми для уменьшения потерь железа с хвостами.The results of investigation of the main magnetic properties and the separation parameters obtained laboratory wet separation nine primary concentrate magnetite and sub-acidulute siberian ores deposits - raw materials of Abagursk preparation plant are present. Recommend sub-acidulate ores to concentrate at common charge with the magnetite ores for decreasing the losses of the iron with tailing.
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuzmenko A. M., Mukhin A. A., Ivanov V.Yu., Bezmaternykh L. N.
Заглавие : Coupled R and Fe magnetic excitations in RFe 3(BO 3) 4 multiferroics
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.269-272. - ISBN 9783037854365, DOI 10.4028/www.scientific.net/SSP.190.269
Ключевые слова (''Своб.индексиров.''): magnetic resonance--rare-earth iron borates--terahertz spectroscopy--antiferromagnetics--coupled mode--exchange coupled--frequency ranges--g factors--iron borate--magnetic excitations--multiferroics--resonance mode--strong interaction--transmission spectrums--antiferromagnetism--electron transitions--gadolinium--ions--magnetic materials--magnetic permeability--magnetic resonance--terahertz spectroscopy--neodymium
Аннотация: Various resonance modes were observed in the transmission spectra of rare-earth iron borates RFe 3(BO 3) 4 (R = Nd 3+, Sm 3+, Gd 3+) at the frequency range 100-600 GHz, which were attributed to collective magnetic excitations in the exchange coupled Fe- and R-subsystems, i.e. antiferromagnetic (Fe) resonance and electron transitions in the R-ions. Strong interaction of the Fe and R oscillations was revealed and theoretically analyzed taking into account feature of the R-ion ground state. Intensities of the coupled modes (contributions to magnetic permeability) strongly depend on a difference of Fe and R ions g-factors that allows defining the sign of the latter. In particular, an appreciable intensity of exchange (Nd) modes in NdFe 3(BO 3) 4 is caused by g Nd?,|| < 0 whereas in GdFe 3(BO 3) 4 with gGd ? gFe ? 2 the exchange (Gd) modes were hided due to compensation of Fe and Gd contributions. In SmFe 3(BO 3) 4, despite a negligible Sm g-factor, the Sm modes were clear observed due to their excitation via coupling with the Fe-subsystem. В© (2012) Trans Tech Publications.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ritter C., Pankrats A. I., Gudim I. A., Vorotynov A. M.
Заглавие : Magnetic structure of iron borate DyFe3(BO3)4: A neutron diffraction study
Коллективы : European Conference on Neutron Scattering
Место публикации : J. Phys.: Conf. Ser.: IOP Publishing Ltd, 2012. - Vol. 340. - Ст.012065. - ISSN 1742-6588, DOI 10.1088/1742-6596/340/1/012065
Примечания : Cited References: 22
Ключевые слова (''Своб.индексиров.''): antiferromagnetics--crystallographic structure--easy-axis anisotropy--iron borate--kramers doublet--low temperatures--magnetic propagation--neutron diffraction measurements--repopulation--room temperature--spin reorientation--sub-lattices--thermal dependences--unit cells
Аннотация: Neutron diffraction measurements were performed on the iron borate DyFe3(BO3)4 to investigate details of the crystallographic structure, the low temperature magnetic structure and its magnetic properties. DyFe3(BO3)4 adopts at room temperature the P3121 symmetry and becomes antiferromagnetic below TN = 39 K. Both, the rare earth and the iron sublattice, follow the same magnetic propagation vector τ = [0, 0, ½] which leads to a doubling of the crystallographic unit cell in the c-direction. The easy axis anisotropy of the rare earth determines the moment orientation to be mainly along c. No spin reorientation is found between TN and 1.5 K, however, a small anomaly in the thermal dependence of the unit cell a-parameter is found at about 27 K which could be connected to repopulation of low lying Kramers doublets of Dy3+. The magnetic moment value of the Fe-moment is at 1.5 K with μFe = 4.5 μB only slightly smaller than expected for an S = 5/2 ion while the Dy moment is strongly reduced and amounts only to μDy = 6.4 μB.
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18.

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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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kosyrev N. N., Varnakov S. N., Tarasov I. A., Lyashenko S. A., Ovchinnikov S. G.
Заглавие : Characterization of manganese and iron silicides by in situ spectral generalized magneto-optical ellipsometry
Коллективы : Workshop Ellipsometry (7; 2012 ; март ; 5-7; Leipzig, Germany)
Место публикации : 7th Workshop on Ellipsometry: abstract book. - 2012. - P. - 82
Аннотация: Dilute magnetic semiconductors (DMS) combine the electronic transport properties of semiconductors and memory characteristics of magnetic materials. The complementary properties of semiconductor and ferromagnetic material can manipulate both degrees of freedoms of electrons0 spins and charges for spintronic devices. In recent years, group IV(Ge,Si)-based DMSs attract considerable experimental effort due to the compatibility with mainstream silicon technology. In ourworkwe present the investigation of structural,magnetic and optical properties ofmanganese and iron silicides thin films on Si (100) substrate by in situ spectral generalizedmagneto-optical ellipsometry. Themeasurementswere performed by spectral and laser ellipsometers (“Spectroscan“ and “LEF-71“ respectively by Institute Semiconductors Physics SB RAS), optimized tomeasure not only traditional ellipsometric parameters, but also magneto-optical response of the sample. The magnetoellipsometers were integrated into the ultrahigh vacuum chambers of molecular beam epitaxy setup, which allowed to control the optical and magnetic properties of thin films directly in the growth process. As a result of the magneto-optical response analysis, it was found that iron and manganese silicides in magnetic phase were formed on the Si surface and by analysis of the ellipsometric parameters dependence on evaporation time the silicide nanoclusters were identified and their structural properties were found. The work was supported by project 4.1 of the OFN RAS, project 27.10 of the Presidium RAS, integration project22 of SB RAS and FEB RAS, and also the FCP NK-744P/6 .
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ritter C., Pankrats A. I., Gudim I. A., Vorotynov A. M.
Заглавие : Magnetic structure of iron borate SmFe3(BO3)4: A neutron diffraction study
Коллективы : Korean Physical Society, Korean Magnetics Society, International Union of Pure and Applied Physics, International conference on magnetism (19; 2012 ; Jul ; 8-13; Busan, Korea/ Bexco, Korea)
Место публикации : The 19th International Conference on Magnetism with Strongly Correlated Electron Systems: book of abstracts. - 2012. - Ст.IJ01. - P.97
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