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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov Y. M., Leksikov A. A., Aksyonov A. E., Edelman I. S.
Заглавие : Magnetic linear dichroism and birefringence of FeBO3 in the 6A1G-]4T1G transition region
Место публикации : Phys. Status Solidi B. - 1981. - Vol. 106, Is. 2. - PK127-K130. - ISSN 0370-1972, DOI 10.1002/pssb.2221060249
Примечания : Cited References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : AVERYANOV E. M.
Заглавие : MIXING THE MOLECULAR EXCITATIONS IN MONOAXIAL LIQUID-CRYSTALS
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 108, Is. 1. - P258-280. - ISSN 0044-4510
Примечания : Cited References: 60
Предметные рубрики: LOCAL FIELD
INFRARED DICHROISM
DISPERSIONS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G.
Заглавие : Application of synchrotron radiation to the study of magnetic materials
Место публикации : Uspekhi Fiz. Nauk: MEZHDUNARODNAYA KNIGA, 1999. - Vol. 169, Is. 8. - P.869-887. - ISSN 0042-1294
Примечания : Cited References: 93
Предметные рубрики: X-RAY-SCATTERING
RESONANCE EXCHANGE SCATTERING
RARE-EARTH-METALS
CIRCULAR-DICHROISM
VALENCE STATES
CO/PD(111) MULTILAYERS
ABSORPTION-SPECTRA
PHASE-TRANSITIONS
SPIN POLARIZATION
EDGE STRUCTURE
Аннотация: The recent results of the studies of magnetic materials using synchrotron irradiation are reviewed. The influence of magnetic effects on X-ray scattering is studied for linearly and circularly polarized photons, and effects of magnetic circular dichroism on the spectra of X-ray absorption and photoelectron emission are discussed. It is shown that X-ray magnetooptics techniques provide fine details of crystal and magnetic structures and also make it possible to separate the spin and orbital contributions to the total moment; to obtain element- and position-sensitive information on the magnetic properties of the material; to visualize domains and domain walls; and to probe magnetization reversal dynamics. A comparison of magnetic neutron and X-ray methods is given.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Morozova T. P.
Заглавие : Temperature dependence of the fine structure of the C and E absorption bands in RbMnF3 below the Neel temperature
Разночтения заглавия :авие SCOPUS: Temperature dependence of the fine structure of the C and E absorption bands in RbMnF3 below the neel temperature
Место публикации : Phys. Solid State: SPRINGER, 2006. - Vol. 48, Is. 2. - P283-290. - ISSN 1063-7834, DOI 10.1134/S1063783406020156
Примечания : Cited References: 24
Предметные рубрики: PEROVSKITE FLUORIDES
VIBRONIC SPECTRA
CRYSTALS
MNF2
INTENSITY
DICHROISM
STATES
Аннотация: The variation in the parameters (width, position, intensity) of the fine structure lines in the C[(6)A(1g) - (4)A(1g), E-4(g)((4)G)] and E[(6)A(1g) - E-4(g)(D-4)] bands in RbMnF3 with temperature is studied in the temperature range 10-70 K. In the C band, two narrow ( 6 cm(-1)) lines are are distinguished at distances of 77 and 80 cm(-1) from the exciton line at T
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Isachenko V. A., Sukhachev A. L., Potseluyko A. M., Zabluda V. N., Zarubina T. V., Edelman I. S.
Заглавие : Magneto-optical properties of Dy3+ in oxide glasses: The origin of the magneto-optical activity of f-f transitions and its anomalous temperature dependence
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 4. - P701-707. - ISSN 1063-7834, DOI 10.1134/S1063783407040178
Примечания : Cited References: 28
Предметные рубрики: MAGNETIC CIRCULAR-DICHROISM
FLUOROZIRCONATE ZBLAN GLASS
OPTICAL-ABSORPTION SPECTRA
DOPED SODA GLASS
SPECTROSCOPIC PROPERTIES
FLUOROBORATE GLASSES
LITHIUM BORATE
IONS
PR3+
GADOLINIUM
Аннотация: The temperature dependence of the absorption spectra and magnetic circular dichroism due to f-f transitions from the H-6(15/2) to F-6 (5/2) and (6)(F (7/2) + H (5/2)) states in the Dy3+ ion in (Dy2O3-P2O5-SiO2-GeO2) and (Dy2O3-La2O3-Al2O3-B2O3-SiO2-GeO2) glasses and the temperature dependence of the Faraday effect were studied. The temperature dependence of the Faraday effect caused by f-d transitions was found to differ from that of the magnetic circular dichroism due to f-f transitions. It was shown that f-f transitions occur preferentially in Dy3+ ions associated into clusters. The origin of the paramagnetic magneto-optical activity of f-f transitions was analyzed. It was shown that the contributions to this activity can differ in value and sign and that the ratio between these contributions depends on the transition type. In some cases, this difference results in an anomalous temperature dependence of the magneto-optical activity.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Sokolov A. E., Sukhachev A. L., Temerov V. L., Stolbovaya N. A., Edelman I. S.
Заглавие : Magnetic circular dichroism and optical absorption in TmAl3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Magnetic circular dichroism and optical absorption in TmAl 3(BO3)4
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 1. - P34-38. - ISSN 1063-7834, DOI 10.1134/S1063783407010076
Примечания : Cited References: 19
Предметные рубрики: SINGLE-CRYSTALS
SPECTROSCOPY
TRANSITIONS
HUNTITE
GROWTH
Аннотация: The polarized spectra of absorption and magnetic circular dichroism in a TmAl3(BO3)(4) single crystal are studied in the re-ion of H-3(6) - F-3(4), H-3(6) - F-3(3),and H-3(3) - F-3(2) electronic transitions in e Tm3+ ion. The structure of the spectra is interpreted qualitatively. It is shown that the magnetic circular dichroism of the H-3(6) - F-3(4) transition is determined by the contribution from the splitting of the ground state, whereas the magnetic circular dichroism of the H-3(6) - F-3(3) transition is governed by the contribution from the splitting of an excited state in a trigonal crystal field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ding Y., Haskel D., Ovchinnikov S. G., Tseng Y. C., Orlov Y. S., Lang J. C., Mao H. K.
Заглавие : Novel pressure-induced magnetic transition in magnetite (Fe(3)O(4))
Разночтения заглавия :авие SCOPUS: Novel pressure-induced magnetic transition in magnetite (Fe3O4)
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2008. - Vol. 100, Is. 4. - Ст.45508. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.100.045508
Примечания : Cited References: 39
Предметные рубрики: MULTIPLE-SCATTERING THEORY
X-RAY DICHROISM
LOWER MANTLE
VERWEY TRANSITION
K-EDGE
CIRCULAR-DICHROISM
SPIN TRANSITION
BAND-STRUCTURE
IRON
FE
Ключевые слова (''Своб.индексиров.''): emission spectroscopy--magnetoelectronics--pressure effects--synchrotron radiation--diamond anvil cell--magnetic transition--x-ray magnetic circular dichroism--magnetite
Аннотация: Fe K-edge x-ray magnetic circular dichroism of magnetite (Fe(3)O(4)) powders was measured with synchrotron radiation under variable pressure and temperature conditions in diamond anvil cell. The magnetic dichroism was observed to decrease discontinuously by similar to 50% between 12 and 16 GPa, independent of temperature. The magnetic transition is attributed to a high-spin to intermediate-spin transition of Fe(2+) ions in the octahedral sites and could account for previously observed structural and electrical anomalies in magnetite at this pressure range. The interpretation of x-ray magnetic circular dichroism data is supported by x-ray emission spectroscopy and theoretical cluster calculations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ovchinnikov S. G., Markov V. V., Kosyrev N. N., Seredkin V. A., Khudyakov A. E., Bondarenko G., Kesler V.
Заглавие : Room-temperature ferromagnetism in Dy films doped with Ni
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2008. - Vol. 403, Is. 18. - P3295-3301. - ISSN 0921-4526, DOI 10.1016/j.physb.2008.04.018
Примечания : Cited References: 25. - The work was supported partly by the Integration Project of SB RAS (# 3.5), Program "Spintronics" of the Department of Physical Sciences of RAS, and RFBR Grant no. 07-03-00320.
Предметные рубрики: METAL NANOSCALE MULTILAYERS
EARTH
MAGNETISM
SURFACE
Ключевые слова (''Своб.индексиров.''): dy--dy-ni bi-layer films--magnetic ordering--magnetic circular dichroism--magneto-optic kerr effect--auger spectroscopy--auger spectroscopy--dy--dy-ni bi-layer films--magnetic circular dichroism--magnetic ordering--magneto-optic kerr effect--magnetic fields--nickel--bi layer films--magnetic (ce)--magneto optical--room temperature (rt) ferromagnetism--spectral dependences--magnetic field effects
Аннотация: Temperature, magnetic field and spectral dependences of magneto-optical effects (MOEs) in bi-layer films Dy(1-x)Nix-Ni and Dy(1-x)(NiFe)(x)-NiFe were investigated, x changes from 0 to 0.06. Peculiar behavior of the MOEs was revealed at temperatures essentially exceeding the Curie temperature of bulk Dy which is explained by the magnetic ordering of the Dy layer containing Ni under the action of two factors: Ni impurities distributed homogeneously over the whole Dy layer and atomic contact of this layer with continues Ni layer. The mechanism of the magnetic ordering is suggested to be associated with the change of the density of states of the alloy Dy(1-x)Nix owing to hybridization with narrow peaks near the Fermi level character for Ni. (C) 2008 Elsevier B.V. All rights reserved.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zabluda V., Saboungi M-L., Edelman I., Fleurier R., Sukhachev A.
Заглавие : Magnetic Circular Dichroism of FePt and FePd nanoparticles in cyclohexane
Коллективы : "Functional Materials", International Conference
Место публикации : International Conference "Functional Materials" (ICFM-09): book of abstracts : October 5-10, Ukraine, Crimea, Partenit. - 2009. - С. 207
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zabluda V.N., Sokolov A.E., Edelman I.S.
Заглавие : Magnetic circular dichroism of mineral oil solutions
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Уральское отделение РАН
Место публикации : IV Euro-Asian Symposium "Trends in MAGnetism" Nanospintronics (EASTMAG-2010). School for young scientist "Spintronics": June 28 - Lule 2, 2010"Book of abstracts. - Ekaterinburg, 2010. - P.254
РИНЦ
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zabluda V.N, Sokolov A.E, Ovchinnikov S.G., Zubavichus Ya.V, Kalsin A.M.
Заглавие : Visible magnetic circular dichroism in gold nanoparticles
Коллективы : International Conference Functional Materials
Место публикации : International Conference Functional Materials (ICFM-2011): Book of abstracts : [3-8 Oct. 2011, Crimea, Ukraine]. - 2011. - С. 187
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12.

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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pomogaev V., Avramov P. V., Kachin S., Pomogaeva A., Jalkanen K. J.
Заглавие : Thermo-dynamical contours of electronic-vibrational spectra simulated using the statistical quantum-mechanical methods
Место публикации : Theor. Chem. Acc. - NEW YORK: SPRINGER, 2011. - Vol. 130, is. 4-6. - С. 609-632. - DEC. - ISSN 1432-881X, DOI 10.1007/s00214-011-0936-6
Примечания : Cited Reference Count: 112. - Гранты: We would like to acknowledge scientific discussions with the following collaborators and friends: Daniel Chipman, Victor Ya. Artyukhov for common discussions concerning theoretical questions and methodology; John S. Tse and Dennis D. Klug for initial discussions concerning the properties of cyanoanthracene; and Yuriko Aoki for discussions of benzene and estradiol. We would also like to thank the following funding agencies and institutions for supporting this work during its various stages of development: Kyushu University, Japan; Steacie Institute for Molecular Sciences, Canada; University of Notre Dame, USA; Siberian Physical-Technical Institute, Russia; Siberian Federal University, Russia; Kirensky Institute of Physics, Russia. We would like to thank FAPESP for project 16782-2/2009 which allowed Prof. Jalkanen to visit LEVB at UniVaP for the period from June 2010 to May 2011 from the Quantum Protein (QuP) Center at the Technical University in Denmark during which time this work was completed.Финансирующая организация: Kyushu University, Japan; Steacie Institute for Molecular Sciences, Canada; University of Notre Dame, USA; Siberian Physical-Technical Institute, Russia; Siberian Federal University, Russia; Kirensky Institute of Physics, Russia
Предметные рубрики: DENSITY-FUNCTIONAL THEORY
INITIO MOLECULAR-DYNAMICS
CIRCULAR-DICHROISM SPECTRA
LASER-INDUCED FLUORESCENCE
NUCLEAR SHIELDING TENSORS
ALANINE N'-METHYLAMIDE
ALKALINE-EARTH DIMERS
ABSORPTION-SPECTRA
HYDRATED ELECTRON
AQUEOUS-SOLUTION
Ключевые слова (''Своб.индексиров.''): organic compounds--molecular dynamics--photophysical properties--electronic spectra--electronic spectra--molecular dynamics--organic compounds--photophysical properties
Аннотация: Three polycyclic organic molecules in various solvents focused on thermo-dynamical aspects were theoretically investigated using the recently developed statistical quantum mechanical/classical molecular dynamics method for simulating electronic-vibrational spectra. The absorption bands of estradiol, benzene, and cyanoanthracene have been simulated, and most notably, the increase in the spectral intensity for the lowest excited state transition as the temperature is increased observed experimentally is well reproduced. In addition, this method has been extended to treat luminescent processes also, and it is seen that the experimental emission spectrum of cyanoanthracene is also well described. The method still needs further refinement, but results to date, including those presented in this work, document clearly that our model is one which is able to treat the many complex effects that the environment have on electronic absorption and emission spectra.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D.
Заглавие : Magnetooptical Studies of Nanoparticle-Containing Borate Glasses
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Solid State Phenomena. - 2011. - Vol. 168-169. - P.525-528. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.168-169.525
Примечания : Cited Reference Count: 9
Предметные рубрики: Materials Science, Multidisciplinary
Physics, Condensed Matter
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--oxide glasses--faraday rotation--magnetic circular dichroism
Аннотация: Faraday rotation (FR) and magnetic circular dichroism (MCD) of nanocomposite structures based on potassium-aluminum-germanium-boron glasses co-doped with Fe and rare earth (RE) or Y+Bi oxides have been studied. Formation of magnetic nanoparticles as a result of the glass heat treatment ensures them magnetic and magneto-optical properties typical of magnetically ordered substances. At the same time, glasses keep transparence in visual spectral range owing to low paramagnetic oxides concentration. FR and MCD spectra of the heat treated glasses are shown to be very close to those of gamma-Fe(2)O(3) and practically independent of the RE element nature for the light wave energies lower than 22000 cm(-1). For higher energies, the MCD spectrum shape depends strongly an RE what evidences the different origin of magneto-optical effects in two spectral ranges.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sukhachev A.L., Malakhovskii A.V., Leont’ev A.A., Gudim I.A.
Заглавие : Magnetic and natural circular dichroism of Nd0.5Gd0.5Fe3(B03)4
Коллективы : International Conference Functional Materials
Место публикации : International Conference Functional Materials (ICFM-2011): Book of abstracts : [3-8 Oct. 2011, Crimea, Ukraine]. - 2011. - С. 185
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edel'man I. S., Petrov D. A., Ivantsov R. D., Zharkov S. M., Khaibullin R. I., Valeev V. F., Nuzhdin V. I., Stepanov A. L.
Заглавие : Microstructure and Magnetooptics of Silicon Oxide with Implanted Nickel Nanoparticles
Разночтения заглавия :авие SCOPUS: Microstructure and magnetooptics of silicon oxide with implanted nickel nanoparticles
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 6. - P1040-1049. - ISSN 1063-7761, DOI 10.1134/S1063776111160035
Примечания : Cited References: 44. - This work was supported by the Russian Foundation for Basic Research (project nos. 11-02-00972, 11-02-90420, 11-02-91341) and the program Research and Scientific-Pedagogical Brainpower of Innovated Russia (State contract 02.740.11.0797).
Предметные рубрики: SIMPLE METAL-CLUSTERS
OPTICAL-PROPERTIES
ION-IMPLANTATION
FARADAY-ROTATION
KERR SPECTRA
GLASS
RESONANCE
PHYSICS
ENERGY
FE
Ключевые слова (''Своб.индексиров.''): disperse structure--effective medium model--implanted samples--irradiation dose--magnetic circular dichroisms--magnetic nickel--magneto-optical faraday effect--magneto-optical measurements--matrix--metal nanoparticles--metallic nickel--nickel nanoparticles--nickel particles--optical range--spectral dependences--surface plasma resonances--tensor components--thin near-surface layers--amorphous silicon--crystal microstructure--dichroism--faraday effect--ion implantation--magnetoplasma--metallic compounds--nanomagnetics--nanoparticles--nickel--silicon compounds--silicon oxides--spectroscopy--tensors--transmission electron microscopy--nickel oxide
Аннотация: Metallic nickel nanoparticles of various sizes are formed in a thin near-surface layer in an amorphous SiO2 matrix during 40-keV Ni+ ion implantation at a dose of (0.25-1.0) x 10(17) ions/cm(2). The micro-structure of the irradiated layer and the crystal structure, morphology, and sizes of nickel particles formed at various irradiation doses are studied by transmission electron microscopy and electron diffraction. The magnetooptical Faraday effect and the magnetic circular dichroism in an ensemble of nickel nanoparticles are studied in the optical range. The permittivity (epsilon) over cap tensor components are calculated for the implanted samples using an effective medium model with allowance for the results of magnetooptical measurements. The spectral dependences of the tensor (epsilon) over cap components are found to be strongly different from those of a continuous metallic nickel film. These differences are related to a disperse structure of the magnetic nickel phase and to a surface plasma resonance in the metal nanoparticles.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sukhachev A. L., Strokova A. Yu., Malakhovskii A. V.
Заглавие : Influence of Glass Matrix on Magneto-Optical Activity of f-f Transitions in Dy(3+) Ion
Коллективы : Russian Acad Sci, Inst Metal Phys, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Solid State Phenomena. - 2011. - Vol. 168-169. - P.557-560. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.168-169.557
Примечания : Cited Reference Count: 4
Предметные рубрики: Materials Science, Multidisciplinary
Physics, Condensed Matter
Ключевые слова (''Своб.индексиров.''): magnetic circular dichroism--magneto-optical activity--rare earth glasses
Аннотация: The absorption and magnetic circular dichroism spectra of f-f transitions (6)H(15/2) - (6)F(3/2), (6)F(5/2), (6)(F(7/2) + H(5/2)) and (6)(F(9/2) + H(7/2)) in Dy(3+) ion were studied in the glasses: Dy(2)O(3)-P(2)O(5)-SiO(2)-GeO(2) and Dy(2)O(3)-La(2)O(3)-Al(2)O(3)-B(2)O(3)-SiO(2)-GeO(2) with different concentrations of Dy(3+) ions in temperature range 100-300 K. :Basing on this data, absolute values and temperature dependences of the paramagnetic magneto-optical activity (MOA) of the transitions were determined. The origin of the MOA of f-f transitions was analyzed with the help of two models. In the first model, MOA is considered as a consequence of admixture of states with opposite parity by odd components of crystal field. The second approach is based on the Judd-Ofelt theory. The same f-f transitions reveal different values and temperature dependences in different glasses, what testifies to a different symmetry of the nearest environment of Dy(3+) ions in these glasses.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sokolov A. E., Edelman I. S., Zabluda V. N., Petrakovskaya E. A., Aleksandrovsky A. S., Shubin A. A., Trukhan S. N., Mart'yanov O. N.
Заглавие : Magneto-optical activity of crude oil and its heavy fractions
Место публикации : Opt. Spectrosc.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 112, Is. 5. - P.755-762. - ISSN 0030-400X, DOI 10.1134/S0030400X12050165
Примечания : Cited References: 18. - This work was performed under Interdisciplinary Integration Project no. 118 of the Siberian Branch of the Russian Academy of Sciences (2009-2011).
Предметные рубрики: MAGNETIC CIRCULAR-DICHROISM
SINGLE-CRYSTALS
SPECTROSCOPY
EPR
ABSORBENCY
PORPHYRIN
SYSTEMS
Аннотация: We have experimentally studied optical and magneto-optical spectra of solutions of crude oils of different origin and their heavy fractions in the visible spectral range. Magnetic circular dichroism of oil in the wavelength range similar to 550 nm has been revealed. We show that the shape of the spectra of this dichroism depends on the origin of crude oil, with the magnetic dichroism magnitude being proportional to the concentration of the oil in the solution. A comparison of the data of magneto-optical spectroscopy with electron paramagnetic resonance spectra and chemical composition of samples has allowed us to conclude that the observed magneto-optical activity is determined by the occurrence of VO2+ complexes in the oil samples. The revealed magneto-optical activity of crude oil can form the basis of a unique method of analysis of the composition and properties of oils of different origin and heavy fractions thereof.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Gudim, I. A.
Заглавие : Optical and magneto-optical properties of Nd0.5Gd0.5Fe3(BO3)4 single crystal in the near IR spectral region
Место публикации : J. Alloys Compd.: Elsevier, 2012. - Vol. 542. - P.157-163. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2012.07.061
Примечания : Cited References: 23. - The work was supported by the Russian Foundation for Basic Researches Grant 12-02-00026 and by the Russian President Grant SS-1044.2012.2.
Предметные рубрики: MAGNETIC CIRCULAR-DICHROISM
GDFE3(BO3)(4)
YB3+
ER3+
ND3+
Ключевые слова (''Своб.индексиров.''): rare earth compounds--nd3+--antiferromagnets--multiferroics--magnetic circular dichroism--absorption spectra
Аннотация: Polarized optical absorption and magnetic circular dichroism (MCD) spectra of the trigonal multiferroic Nd0.5Gd0.5Fe3(BO3)4 were studied in the region of transitions 4I9/2 → 4F3/2 and 4I9/2 → (4F5/2 + 2H9/2) in Nd3+ ion. Components of the crystal field splitting of the states were identified with the help of MCD and polarized absorption spectra. Splitting of the Nd3+ absorption lines caused by the magnetic ordering were observed. Splitting of Nd3+ ground state in Fe-sublattice exchange field was found to be ∼9 cm−1 at 5.7 K. The Zeeman splitting of some absorption lines in the external magnetic field and changes of the effective Landé factors in the C3-direction as a result of the corresponding optical transitions were found. Peculiarities in the temperature behavior of the absorption lines connected both with the ground and excited states were revealed. Peculiarities connected with the excited states testify to the local crystal distortions in the excited states.
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20.

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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