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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Orientational order and polarizability of molecules in a nematic liquid crystal
Место публикации : Phys. Solid State. - 2014. - Vol. 56, Is. 5. - P.1058-1063. - ISSN 1063-7834, DOI 10.1134/S1063783414050035
Примечания : Cited References: 17
Предметные рубрики: NORMAL-BUTYLANILINE MBBA
INTERNAL-ROTATION
TRANSITION
PHASE
Аннотация: The influence of the orientational order of molecules in a nematic liquid crystal on the mean value ?? and anisotropy ?? of the molecular polarizability has been studied in the framework of the molecular statistical approach with allowance for the perturbation of the electronic structure of molecules due to the change in the conformation of their aromatic core and intermolecular interactions. Experimental dependences of ?? and ?? on the molecular orientational order parameter S have been derived, and their specific features for the known objects have been explained. The possibility of separating the contributions of opposite signs to the dependence ??(S) due to the change in the conformation of molecules and intermolecular interactions has been shown using nematic MBBA as an example. © 2014 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aver'yanov E. M.
Заглавие : Structural and thermodynamic consequencies of the interaction of conformational degrees of freedom of azomethines in the nematic phase
Место публикации : J. Struct. Chem.: Springer, 2014. - Vol. 55, Is. 4. - P.605-611. - ISSN 0022-4766, DOI 10.1134/S0022476614040039. - ISSN 1573-8779
Примечания : Cited References: 21
Предметные рубрики: CONJUGATED POLY(AZOMETHINE)S
TERMINAL SUBSTITUENTS
ELECTRONIC-STRUCTURES
FLUORINATED ANALOGS
INTERNAL-ROTATION
MOLECULES
COMPOUND
ANGLES
STATE
NMR
Ключевые слова (''Своб.индексиров.''): azomethines--benzylideneaniline--conformation--steric effects of substituents--nematic-isotropic liquid transition--conformational polymorphism
Аннотация: The interaction of the conformational degrees of freedom of azomethines in the nematic phase, which is induced by electronic donor-acceptor properties of the terminal substituents of the benzylideneaniline core is studied. These degrees of freedom related to the rotation angles phi (k) around the bonds between the substituent and the aniline ring (phi(1)) and also between the CH=N bridge and the aniline ring (omega(2)) are characterized by the parameters Q (k) = aOE (c) cos(2)phi (k) . It is found that the interaction of these degrees of freedom is manifested in the linear dependence Q (2)(Q (1)). Within the phenomenological theory the effect of this interaction on changes delta (k) in the Q (k) values during the nematic liquid crystal-isotropic liquid phase transition is revealed along with the temperature T (NI) and character of this transition. The derivation of previously established empirical dependences T (NI)(Q (k) ) is presented in the presence of direct and indirect steric effects of side substituents affecting the Q (k) values. A diverse combination of delta (k) signs in the nematic phase, which is a prerequisite for the conformational polymorphism of the nematic phases of azomethines, is shown.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Spin rotation for ballistic electron transmission induced by spin-orbit interaction
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2002. - Vol. 66, Is. 7. - Ст.75331. - ISSN 1098-0121, DOI 10.1103/PhysRevB.66.075331
Примечания : Cited References: 18
Предметные рубрики: 2-DIMENSIONAL ELECTRONS
WAVE-GUIDES
TRANSPORT
Аннотация: We study spin-dependent electron transmission through one- and two-dimensional curved waveguides and quantum dots with account of spin-orbit interaction. We prove that for a transmission through an arbitrary structure there is no spin polarization provided the electron transmits in an isolated energy subband and only two leads are attached to the structure. In particular there is no spin polarization in the one-dimensional wire, for which a spin-dependent solution is found analytically. The solution demonstrates the spin evolution as dependent on a length of wire. The numerical solution for transmission of electrons through the two-dimensional curved waveguides coincides with the solution for the one-dimensional wire if the energy of electron is within the first energy subband. In the vicinity of edges of the energy subbands there are sharp anomalies of spin flipping.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Timofeev I. V., Bikbaev R. G., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Cholesteric layers with tangential-conical surface anchoring for an electrically controlled polarization rotator
Место публикации : Opt. Mater. Express. - 2021. - Vol. 11, Is. 5. - P.1527-1536. - ISSN 21593930 (ISSN), DOI 10.1364/OME.425130
Примечания : Cited References: 25. - Russian Science Foundation (Grant No. 18-72-10036)
Аннотация: The voltage dependences of polarization characteristics of light passed through the cholesteric layers with tangential-conical boundary conditions have been investigated. It has been shown that such layers allow turning the polarization azimuth more than 70˚ because of the unique untwisting effect of the cholesteric helix, due to free azimuthal rotation of the director on the substrate with conical anchoring. Optical cells under study have some advantages (low control voltage, smooth variation of polarization azimuth, simplicity of design) and can be used as an electrically controlled polarization rotator of white light.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Morozova T. P., Zabluda V. M., Kim T. A., Turpanov I. A., Betenkova A. Ya., Dynnik Y. A.
Заглавие : Dispersion of Faraday rotation in Co/SiO2 multilayer films
Место публикации : JETP Letters. - 1996. - Vol. 63, Is. 4. - P.273-277. - ISSN 0021-3640, DOI 10.1134/1.567015
Примечания : Cited References: 9
Предметные рубрики: PARTICLES
Аннотация: The Faraday rotation spectra of Co/SiO2 multilayer films were found to be substantially different from the well-known spectra of homogeneous Co films. The character of these changes was studied as a function of the thicknesses of the ferromagnetic metal and the nonmagnetic dielectric layers. (C) 1996 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I., Kliava J.
Заглавие : Oxide glasses with magnetic nanoparticles: transparent magnets (Faraday rotation and electron magnetic resonance studies)
Коллективы : RFBR-CNRS [07-02-92174]
Разночтения заглавия :авие SCOPUS: Oxide glasses with magnetic nanoparticles: Transparent magnets (Faraday rotation and electron magnetic resonance studies)
Место публикации : Phys. Status Solidi B. - 2009. - Vol. 246, Is. 10. - P.2216-2231. - ISSN 0370-1972, DOI 10.1002/pssb.200945169
Примечания : Cited References: 87. - This work is supported in part by RFBR-CNRS joint project, grant No 07-02-92174. We are grateful to E. Petrakovskaja and O. Ivanova for measuring and discussing, respectively, the EMR spectra in thermally treated samples and the FR spectral and magnetic field dependences.
Предметные рубрики: SPIN-HAMILTONIAN PARAMETERS
SINGLE-DOMAIN PARTICLES
SUPERPARAMAGNETIC RESONANCE
CRYSTALLIZATION BEHAVIOR
FERRIMAGNETIC RESONANCE
PARAMAGNETIC-RESONANCE
TEMPERATURE-DEPENDENCE
COMPUTER-SIMULATIONS
FINE PARTICLES
BORATE GLASSES
Аннотация: In the first part of this paper we outline the state of the art in the field of magnetic nanoparticles in oxide glasses. We describe the theoretical background of two complementary techniques used for the studies of the state of paramagnetic ions, clusters and magnetic particles in a diamagnetic matrix, viz., magnetooptical Faraday rotation (FR) and electron magnetic resonance (EMIR) and we overview previous results obtained with these techniques for several glass systems. In the second part, we highlight the case of potassium-alumina-borate glasses - a glassy system where doping with paramagnetic oxides results in formation of magnetic particles at very low contents of paramagnetic additions: Fe(2)O(3) and MnO. In the special case when the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles with characteristics close to those of manganese ferrite are formed already at the first stage of the glass preparation. After thermal treatment all glasses show FR and EMR spectra attesting to the presence of superparamagnetic nanoparticles, characterized by relatively broad size and shape distributions. The formation of magnetic nanoparticles confers to these glasses magnetic and magnetooptical properties typical of magnetically ordered substances. At the same time, the glasses remain transparent in a part of the visible and near infrared spectral range and display a high FR value. Such properties make them particularly interesting for use as new media for various magneto-optical devices. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Yan Rong, Wu, Yong, Wang, Jian Guo, Vendrell, Oriol, Kimberg V., Zhang, Song Bin
Заглавие : Electron-rotation coupling in diatomics under strong-field excitation
Место публикации : Phys. Rev. A. - 2020. - Vol. 102, Is. 3. - Ст.033114. - ISSN 2469-9926, DOI 10.1103/PhysRevA.102.033114. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 78. - S.B.Z. thanks H. D. Meyer for his helpful instructions of Wigner-DVR in MCTDH. Grants from the National Basic Research Program of China (2017YFA0403200), NSFC (No. 11604197, No. 11974230, and No. 11934004), the Science Challenge Program of China (TZ2018005 and TZ2016005) are acknowledged. V.K. acknowledges financial support from Swedish Research Council (VR) and the Ministry of Science and High Education of Russian Federation, Project No. FSRZ2020-0008.
Предметные рубрики: REAL-TIME OBSERVATION
DYNAMICS
LASER
ULTRAFAST
MOLECULES
Аннотация: he photoexcitation and photodissociation of diatomic molecules by intense pulse lasers has been the subject of extensive investigations over the past decades. However, the usually employed theoretical framework neglects the coupling between the molecular rotational angular momentum (R) and the angular momentum of the electrons projected onto the molecular axis Ω=Λ+Σ, which results in the known Λ-doubling phenomenon in high-resolution electronic spectra of diatomic molecules. While neglecting this coupling is an excellent approximation in the weak-field or perturbative regime owing to the large mass difference between the rotating atoms and the electrons, the approximation breaks down for intense laser pulses because of the repeated Rabi cycling of the electronic transitions, which can have a significant effect on the rotational degrees of freedom of the molecule. By correcting the transition dipole matrix elements and introducing angular basis sets based on Wigner D functions, the conventional theoretical treatment is generalized to a universal description valid for both the weak- and strong-field regimes. The theoretical treatment developed here is applied to the ∣1Σ› to ∣1Π› transitions in diatomic systems. Our results reveal that, for field intensities resulting in about one Rabi cycling for extreme ultraviolet or x-ray transitions, the theoretical predictions by the conventional theoretical frame need to be corrected when considering observables such as the molecular alignment and the angular distribution of the photofragments.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Avramov P. V., Ovchinnikov S. G., Varganov S. A., Tomilin F. N.
Заглавие : Electronic and atomic structures of the isomers of endohedral and exohedral fullerene complexes with two lithium atoms
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2001. - Vol. 43, Is. 9. - P1794-1799. - ISSN 1063-7834, DOI 10.1134/1.1402242
Примечания : Cited References: 21
Предметные рубрики: VIBRATION-ROTATION BANDS
INFRARED ROTATION
C-60
BUCKMINSTERFULLERENE
ION
Аннотация: The electronic structures of all the possible isomers of endohedral and exohedral C(60) fullerene complexes with two lithium atoms are theoretically investigated. It is found that the electronic structures of these compounds are characterized by an impurity filled-level state determining the band gap. The location of the impurity state and, correspondingly, the band gap of the exohedral fullerene complexes depend on the coordination mode and the distance between the alkali metal ions. A similar dependence is observed for the total energy of the exohedral fullerene complex under investigation. (C) 2001 MAIK "Nauka/ Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhigalov V. S., Ivantsov R. D., Edelman I. S., Seredkin V. A., Frolov G. I., Bondarenko G. V.
Заглавие : Faraday effect in nanogranular Co-Sm-O films
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2005. - Vol. 47, Is. 6. - P1129-1133. - ISSN 1063-7834, DOI 10.1134/1.1946868
Примечания : Cited References: 13
Предметные рубрики: ROTATION
CO/SIO2
Аннотация: The Faraday effect (FE) was studied in Co-Sm-O composite films consisting of nanoparticles of metallic cobalt embedded in a samarium oxide dielectric matrix. The volume of the magnetic phase was similar to 60%. The FE spectral dependence for the condensates studied revealed a substantial change as compared to that for bulk cobalt samples, as well as for the films of nanocrystalline Co and CoSm films prepared in this study. An enhancement of the FE was also observed in the short-wavelength part of the optical spectrum. (c) 2005 Pleiades Publishing, Inc.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Kononov V. P., Popel V. M., Khudyakov A. E., Vasilyeva E. P., Zabluda V. N., Edelman I. S., Staroverova I. V., Blekher B. E., Parshin A. S.
Заглавие : Faraday-effect in MBE-grown magnetic multilayered Fe/Cu films
Место публикации : Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 3. - P.602-605. - ISSN 0367-3294
Примечания : Cited References: 9
Предметные рубрики: KERR ROTATION
ENHANCEMENT
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KAZANTSEV A. P., KRASNOV I. V.
Заглавие : DEEP POTENTIAL WELLS AND ROTATION OF ATOMS IN A LIGHT-FIELD
Место публикации : Phys. Lett. A: ELSEVIER SCIENCE BV, 1988. - Vol. 127, Is. 1. - P33-36. - ISSN 0375-9601, DOI 10.1016/0375-9601(88)90960-7
Примечания : Cited References: 15
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : The origin of an inflection point on the temperature dependence of the London penetration depth in hole-doped cuprate high-temperature superconductors
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00837, 20-3270059]
Место публикации : J. Exp. Theor. Phys. - 2021. - Vol. 133, Is. 3. - P.351-359. - ISSN 1063-7761, DOI 10.1134/S1063776121080021. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 77. - This work was supported by the Russian Foundation for Basic Research, project nos. 18-02-00837 and 20-3270059
Предметные рубрики: MUON-SPIN-ROTATION
QUASI-PARTICLES
FERMI-SURFACE
Аннотация: A scenario of the formation of an experimentally observed inflection point on the temperature dependence of the London penetration depth λ in cuprate high-temperature superconductors (HTSCs) with optimal hole doping is discussed within the spin-polaron concept. It is shown that the reason for the appearance of an inflection point on the 1/λ2(T) dependence is due to the features of the energy spectrum of spin-polaron quasiparticles in the superconducting phase, as well as to the specific temperature dependence of their spectral density.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gunyakov V. A., Timofeev I. V., Krakhalev M. N., Sutormin V. S., Lee W., Zyryanov V. Ya.
Заглавие : Linear polarization rotation by a twisted-nematic Fabry–Pйrot cavity
Коллективы : International Liquid Crystal Conference
Место публикации : Abstracts of 27th International Liquid Crystal Conference (ILCC 2018). - 2018. - Ст.P4-C1-21
Примечания : Cited References: 3
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyapina A. A., Pilipchuk A. S., Sadreev A. F.
Заглавие : Trapped modes in a non-axisymmetric cylindrical waveguide
Место публикации : J. Sound Vib. - 2018. - Vol. 421. - P.48-60. - ISSN 0022460X (ISSN), DOI 10.1016/j.jsv.2018.01.056
Примечания : Cited References: 52. - This work has been supported by RFBR through Grant 17-02-00440. A.S. acknowledges discussions with E.N. Bulgakov, D.N. Maksimov, H. Schanz, P. Seba, L. Sirko, H.-J. Stöckmann and Shubo Wang.
Ключевые слова (''Своб.индексиров.''): trapped modes--cylindrical non-axisymmetric waveguide--waveguide rotation--wave faucet
Аннотация: We consider acoustic wave transmission in a non-axisymmetric waveguide which consists of a cylindrical resonator and two cylindrical waveguides whose axes are shifted relatively to each other by an azimuthal angle Δφ . Under variation of the resonator's length and fixed Δφ we find bound states in the continuum (trapped modes) due to full destructive interference of resonant modes leaking into the waveguides. Rotation of the waveguide adds complex phases to the coupling strengths of the resonator eigenmodes with the propagating modes of the waveguides tuning Fano resonances to give rise to a wave faucet. Under variation of Δφ with fixed resonator's length we find symmetry protected trapped modes. For Δφ ≠ 0 these trapped modes contribute to the scattering function supporting high vortical acoustic intensity spinning inside the resonator. The waveguide rotation brings an important feature to the scattering and provides an instrument for control of acoustic transmittance and wave trapping.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kliava J., Edelman I. S., Potseluyko A. M., Petrakovskaja E. A., Berger R., Bruckental I., Yeshurun Y., Malakhovskii A. V., Zarubina Y. V.
Заглавие : Magnetic and optical properties and electron paramagnetic resonance of gadolinium-containing oxide glasses
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2003. - Vol. 15, Is. 40. - P6671-6681. - ISSN 0953-8984, DOI 10.1088/0953-8984/15/40/005
Примечания : Cited References: 30
Предметные рубрики: ABSORPTION-SPECTRA
FARADAY-ROTATION
SPIN-RESONANCE
IONS
GD3+
SPECTROSCOPY
BEHAVIOR
GD-3
Ключевые слова (''Своб.индексиров.''): doping (additives)--electronic structure--glass--lanthanum compounds--light absorption--magnetic susceptibility--oxides--paramagnetic resonance--positive ions--rate constants--substitution reactions--absorption band--gadolinium containing oxide glasses--positive weiss constants--gadolinium compounds
Аннотация: Magnetic susceptibility, electron paramagnetic resonance (EPR) and optical absorption have been studied in a glass system 20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2 + GeO2) with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in more heavily doped glasses and ascribed to clustering of Gd3+ ions. Computer simulations of the EPR spectra show that the short-range ordering in the environment of the Gd3+ ions is well preserved. The relative distribution widths of the ligand coordinates are less than 2%. In the more heavily doped glasses the EPR spectra are superpositions of signals arising from isolated ions and ferromagnetic clusters. The increase of Gd3+ concentration is shown to change substantially the strong optical absorption edge while only small changes of f-f absorption band characteristics are observed. This difference is associated with the different effect of the Gd ion clustering on the mechanisms of the strong absorption in the ultraviolet region and the f-f absorption.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bedarev V. A., Pashchenko M. I., Bludov A. N., Gnatchenko S. L., Bezmaternykh L. N., Temerov V. L.
Заглавие : Magnetic field-induced rotation of the plane of polarization of light in the antiferromagnetic ferroborate TbFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Magnetic field-induced rotation of the plane of polarization of light in the antiferromagnetic ferroborate TbFe 3(BO 3) 4
Место публикации : Low Temp. Phys. - 2011. - Vol. 37, Is. 6. - P.476-479. - ISSN 1063-777X, DOI 10.1063/1.3614411; \b Физика низких температур
Примечания : Cited References: 11
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--iron compounds--light polarisation--magnetisation--tellurium compounds
Аннотация: The magnetic field dependences of the rotation of the plane of polarization of light and the magnetization in single crystals of the ferroborate TbFe3(BO3)(4) are studied. The main contribution to the magnetic field-induced rotation of the plane of polarization is found to be from the magnetic subsystem of the terbium ions. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3614411]
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17.

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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18.

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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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Roessli B., Staub U., Amato A., Herlach D., Pattison P., Sablina K. A., Petrakovskii G. A.
Заглавие : Magnetic phase transitions in the double spin-chains compound LiCu2O2
Место публикации : Physica B. - 2001. - Vol. 296, Is. 4. - P.306-311. - ISSN 0921-4526, DOI 10.1016/S0921-4526(00)00574-3
Примечания : Cited References: 17
Предметные рубрики: ORDERED MOMENT
COPPER
CRYSTAL
LI2CUO2
Ключевые слова (''Своб.индексиров.''): muon-spin rotation--spin ladder--magnetic ordering--licu2o2--crystal structure--lithium compounds--magnetic anisotropy--magnetic field effects--magnetic relaxation--magnetization--order disorder transitions--specific heat of solids--x ray diffraction analysis--anisotropic line broadening--muon spin rotation--spin ladder--antiferromagnetic materials
Аннотация: We report high-resolution X-ray diffraction, muon-spin-rotation spectroscopic and specific heat measurements in the double spin-chains compound LiCu2O2. The X-ray diffraction results show that the crystal structure of LiCu2O2 is orthorhombic down to T = 10 K. Anisotropic line-broadening of the diffraction peaks is observed, indicating disorder along the spin chains. Muon-spin relaxation and specific heat measurements show that LiCu2O2 undergoes a phase transition to a magnetic ordered state at T-1 similar to 24 K. The specific heat data exhibits a second lambda -like peak at T-2 similar to 32.5 K, which increases with increasing magnetic field in a similar way to that found in spin-ladder compounds. (C) 2001 Elsevier Science B.V. All rights reserved.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Polyakov V. V., Polyakova K. P., Seredkin V. A., Patrin G. S.
Заглавие : Magneto-optical Kerr effect enhancement in Co-Ti-O nanocomposite films
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.506-509. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.506. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): kerr effect--magneto-optical properties--nanocomposite films--nanogranular films--co films--kerr rotation angle--layer structures--layered structures--magnetic phase--magneto-optical kerr effects--magneto-optical spectra--magnetooptical properties--metal film--nanogranular films--volume concentration--wavelength ranges--kerr magnetooptical effect--magnetic materials--metallic films--nanocomposite films--optical kerr effect--optical properties--wavelength--cobalt
Аннотация: Co-Ti-O nanogranular films with different volume concentrations of a magnetic phase and Co/Ti-O layered structures with different numbers of layer pairs are studied by the magnetooptical Kerr effect. It is shown that, unlike the case of homogeneous metal films, the magnetooptical spectra of the nanogranular films exhibit resonance with a significant increase in the Kerr rotation angle in the wavelength range 500-700 nm. It is found that the Kerr rotation angle of the Co/Ti-O layer structures in the wavelength range 500-600 nm grows by an order of magnitude as compared to its value for ordinary Co films. В© (2012) Trans Tech Publications.
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