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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., POPOV M. A.
Заглавие : Dynamics in the systems with the 3-spin coupling induced by the strong radiofrequency field
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1993. - Vol. 103, Is. 6. - P.2129-2141. - ISSN 0044-4510
Примечания : Cited References: 24
Предметные рубрики: RESONANCE
LINE
Аннотация: The dynamics of the crystal nucleus spin system in constant and continuous strong radiofrequency magnetic fields is studied. The variation of the relaxation properties of the magnetization perpendicular to the effective field is studied with changing the field orientation in the rotating frame of coordinates and with changing the relation in the mean hamiltonian of two- and three-spin dipole-dipole couplings. The third and fourth moments of the NMR spectrum in the rotating frame of coordinates and the free precession fall are calculated by means of the memory function. The connection between the three-spin coupling and the features of such falls observed in the experiments under magic angle and bias from it is explained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Rudenko V. V., Kazak N. V., Edelman I. S., Gavrichkov V. A.
Заглавие : Weak antiferromagnet iron borate FeBO3. classical object for magnetism and the state of the art
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-12-00022]
Место публикации : J. Exp. Theor. Phys. - 2020. - Vol. 131, Is. 1. - P.177-188. - ISSN 1063-7761, DOI 10.1134/S106377612007016X. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 74. - This work was supported by the Russian Science Foundation, project no. 18-12-00022
Предметные рубрики: ELECTRONIC-STRUCTURE
TRANSITION
RESONANCE
FERROMAGNETISM
DEPENDENCE
Аннотация: The simple lattice and magnetic structure, the high Neel temperature, the narrow antiferromagnetic resonance line of FeBO3, and the narrow electron paramagnetic resonance line of its isostructural diamagnetic analogs MBO3:Fe3+(M = Ga, In, Sc, Lu) make iron borate unique for investigations and applications. Iron borate is a model crystal for numerous experimental and theoretical studies, including spin crossovers and metallization at megabar pressures and many-electron effects in optics and X-ray spectroscopy. The recent works dealing with the investigation of the properties of FeBO(3)are reviewed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : VOROTINOV A. M., SABLINA K. A.
Заглавие : SPIN-GLASS STATE IN AMORPHOUS BI2CUO4
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1993. - Vol. 87, Is. 3. - P209-211. - ISSN 0038-1098, DOI 10.1016/0038-1098(93)90477-5
Примечания : Cited References: 6
Предметные рубрики: RESONANCE
Аннотация: The magnetic susceptibility and magnetic resonance measurements of an amorphous compound Bi2CuO4 have been carried out. It was pointed out, that a part of Cu2+ ions stays in the paramagnetic state down to T=4,2 K. The magnitude of the effective exchange integral in amorphous Bi2CuO4 has been estimated. The magnetic resonance measurements revealed the existance of the magnetic phase transition to spin-glass state at T=100 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kliava J., Malakhovskii A. V., Edelman I. S., Potseluyko A. M., Petrakovskaja E. A., Bruckental I., Yeshurun Y., Zarubina T.
Заглавие : Unusual magnetic phase transitions in Gd3+ clusters in multicomponent oxide glasses
Разночтения заглавия :авие SCOPUS: Unusual magnetic phase transitions in Gd 3+ clusters in multicomponent oxide glasses
Место публикации : J. Supercond. Nov. Magn.: SPRINGER, 2007. - Vol. 20, Is. 2. - P149-153. - ISSN 1557-1939, DOI 10.1007/s10948-006-0116-4
Примечания : Cited References: 7
Предметные рубрики: GADOLINIUM
RESONANCE
Ключевые слова (''Своб.индексиров.''): oxide glasses--gadolinium--magnetic clusters--superparamagnetism--gadolinium--magnetic clusters--oxide glasses--superparamagnetism--magnetic clusters--magnetic phase transitions--oxide glasses--weiss constant--antiferromagnetic materials--ferromagnetic materials--gadolinium--magnetic anisotropy--magnetic susceptibility--paramagnetic resonance--phase transitions--positive ions--superparamagnetism--glass
Аннотация: Magnetic susceptibility, EPR and optical properties 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; two magnetic transitions at 55 and 12 K have been detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters of Gd3+ ions. The EPR spectra confirm the clustering at higher Gd contents. At low temperatures the cluster-related resonance indicates an onset of magnetic anisotropy. The clustering, depending on the Gd concentration, correlates with a shift to lower energies of the strong optical absorption band edge.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskaya E. A., Isakova V. G., Bayukov O. A., Velikanov D. A.
Заглавие : Superparamagnetism of magnetite particles in C-60 fullerite powder
Разночтения заглавия :авие SCOPUS: Superparamagnetism of magnetite particles in C60 fullerite powder
Место публикации : Tech. Phys.: AMER INST PHYSICS, 2005. - Vol. 50, Is. 6. - P790-793. - ISSN 1063-7842, DOI 10.1134/1.1947359
Примечания : Cited References: 9
Предметные рубрики: RESONANCE
Аннотация: A new magnetic material, C-60 fullerite powder doped by magnetite (Fe3O4) nanoparticles, is obtained by heating a mixture of fullerite and iron(III) acetylacetonate. It is shown that the material offers superparamagnetic properties. Surface bonding between the nanoparticles and the fullerite is established. (c) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Varnakov S. N., Bartolome J., Sese J., Ovchinnikov S. G., Komogortsev S. V., Parshin A. S., Bondarenko G. V.
Заглавие : Size effects and magnetization of (Fe/Si)(n) multilayer film nanostructures
Разночтения заглавия :авие SCOPUS: Size effects and magnetization of (Fe/Si) n multilayer film nanostructures
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 8. - P1470-1475. - ISSN 1063-7834, DOI 10.1134/S1063783407080124
Примечания : Cited References: 36
Предметные рубрики: GIANT MAGNETORESISTANCE
FE/SI MULTILAYERS
ULTRAHIGH-VACUUM
SUPERLATTICES
EXCHANGE
RESONANCE
LAYER
Аннотация: The temperature dependence of the magnetization of (Fe/Si) (n) multilayer films with nanometer layers is investigated. The films are prepared through thermal evaporation under ultrahigh vacuum onto Si(100) and Si(111) single-crystal substrates. It is revealed that the thickness of individual iron layers in (Fe/Si) (n) multilayer films affects the magnetization and its temperature dependence. The inference is made that this dependence is associated with the formation of a chemical interface at the Fe-Si boundaries. The characteristics of the chemical interface in the (Fe/Si) (n) films are estimated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Davydov V. Yu., Klochikhin A. A., Smirnov A. N., Strashkova I. Y., Krylov A. S., Lu H., Schaff W. J., Lee H. M., Hong Y. L., Gwo S.
Заглавие : Selective excitation of E-1(LO) and A(1)(LO) phonons with large wave vectors in the Raman spectra of hexagonal InN
Коллективы : RFBR [09-02-01280]; NSC-RFBR [08-02-92003-HHC]
Разночтения заглавия :авие SCOPUS: Selective excitation of E1 (LO) and A1 (LO) phonons with large wave vectors in the Raman spectra of hexagonal InN
Место публикации : Phys. Rev. B. - 2009. - Vol. 80, Is. 8. - Ст.81204. - ISSN 1098-0121, DOI 10.1103/PhysRevB.80.081204
Примечания : Cited References: 15. - We are thankful to B. N. Mavrin and A. N. Vtyurin for the arrangement NIR measurements and S. A. Permogorov for the critical reading of the manuscript. This work was supported by RFBR (Grant No. 09-02-01280), NSC-RFBR (Grant No. 08-02-92003-HHC), and the Program of RAS "New materials and structures."
Предметные рубрики: SCATTERING
RESONANCE
Ключевые слова (''Своб.индексиров.''): iii-v semiconductors--indium compounds--phonon dispersion relations--raman spectra--wide band gap semiconductors
Аннотация: It is shown that dispersions of E-1(LO) and A(1)(LO) modes of InN can be restored in a wide interval of wave vectors by studying impurity-induced first-order Raman scattering as a function of exciting light energy. It is also shown that due to the resonance character of scattering the observed phonon energies correspond to the wave vectors strictly defined by exciting photon energies. The frequencies of E-1(LO) and A(1)(LO) phonons at the Gamma point obtained by extrapolation to zero wave vectors were found to be 604 and 592 cm(-1), respectively.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rotter I., Sadreev A. F.
Заглавие : Zeros in single-channel transmission through double quantum dots
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2005. - Vol. 71, Is. 4. - Ст.46204. - ISSN 1063-651X, DOI 10.1103/PhysRevE.71.046204
Примечания : Cited References: 28
Предметные рубрики: PHASE EVOLUTION
RESONANCE
TRANSPORT
SYSTEMS
Ключевые слова (''Своб.индексиров.''): fano interference--fano resonances--overlapping resonances--transmission amplitude--channel capacity--eigenvalues and eigenfunctions--function evaluation--hamiltonians--mathematical models--mathematical operators--matrix algebra--resonance--signal interference--semiconductor quantum dots
Аннотация: By using a simple model we consider single-channel transmission through a double quantum dot that consists of two single dots coupled by a wire of finite length L. Each of the two single dots is characterized by a few energy levels only, and the wire is assumed to have only one level whose energy depends on the length L. The transmission is described by using S matrix theory and the effective non-Hermitian Hamilton operator H-eff of the system. The decay widths of the eigenstates of H-eff depend strongly on energy. The model explains the origin of the transmission zeros of the double dot that is considered by us. Mostly, they are caused by (destructive) interferences between neighboring levels and are of first order. When, however, both single dots are identical and their transmission zeros are of first order, those of the double dot are of second order. First-order transmission zeros cause phase jumps of the transmission amplitude by pi, while there are no phase jumps related to second-order transmission zeros. In this latter case, a phase jump occurs due to the fact that the width of one of the states vanishes when crossing the energy of the transmission zero. The parameter dependence of the widths of the resonance states is determined by the spectral properties of the two single dots.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : PATRIN G. S., VELIKANOV D. A., PETRAKOVSKII G. A.
Заглавие : STUDY OF PHOTOINDUCED MAGNETISM IN FEBO3 CRYSTALS WITH A SQUID-MAGNETOMETER
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 103, Is. 1. - P234-251. - ISSN 0044-4510
Примечания : Cited References: 28
Предметные рубрики: RESONANCE
BORATE
Аннотация: The results are given of experimental and theoretical study for the photoinduced variation of the magnetic moment in FeBO3. In the experiment a SQUID-magnetometer provided with the optical pump system is used. The study of field, temperature and time dependences of the photoinduced magnetic moment variation for various levels of the optical emission power allows to find the mechanism responsible for changing magnetic state under irradiation. All the experimental results are explained within the model in which the crystal-matrix is described in the continual approximation and a photocenter, probably, Fe2+ ion is done as a quasi Ising S=1 ion coupled by exchange with one of the crystal magnetic sublattice. Under illuminating the redistribution of the principal multiplet level populations occurs so that the level of the stronger anisotropic character is populated predominantly due to the selection rules. The model used allows to calculate and explain the anisotropic properties of FeBO3 crystals and spin-flip transition in the basal plane at low temperature.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Rudenko V. V., Tugarinov V. I.
Заглавие : Temperature dependence of the uniaxial magnetic anisotropy of rhombohedral antiferromagnetic crystals with ions in the S state
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 1. - P112-116. - ISSN 1063-7834, DOI 10.1134/S1063783410010191
Примечания : Cited References: 19
Предметные рубрики: ALPHA-FE2O3
RESONANCE
FIELD
MNF2
Аннотация: The contributions of the anisotropic exchange to the firstand second-order uniaxial anisotropy constants have been calculated for hematite at T = 0 K and arbitrary temperatures. The results of the calculations and the most significant mechanisms are taken into account in interpreting the temperature dependence of the anisotropy in rhombohedral antiferromagnetic crystals. The first-order anisotropy constant for hematite is described by the dipole interaction, contributions of the "single-ion" nature, and relatively small contributions of the anisotropic exchange. The second-order constant for hematite includes the "single-ion" contribution and the contribution of the anisotropic exchange. For FeBO(3) and MnCO(3) crystals, the main contributions to the first-order anisotropy constant come from the dipole and single-ion mechanisms.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O., Ivantsov R. D., Petrakovskaja E. A., Velikanov D. A., Zabluda V. N., Hennet L., Thiaudiere D., Saboungi M. L., Zubavichus Y., Stepanov S., Zaikovskii V. I., Artemenko A., Kliava J.
Заглавие : Nanoparticle-containing glasses co-doped with transition and rare earth elements: comparative studies of transparent magnets
Коллективы : International Conference on the Chemistry of Glasses and Glass-Forming Melts (2011 ; Sept.; Oxford, England)
Место публикации : Phys. Chem. Glasses - Eur. J. Glass Sci. Technol. Part B: Society of Glass Technology, 2012. - Vol. 53, Is. 2. - P.37-44. - ISSN 1753-3562
Примечания : Cited References: 22
Предметные рубрики: ANISOTROPY
RESONANCE
FERRITE
Аннотация: A comparative multitechnique study (including transmission electron microscopy, synchrotron radiation, static magnetisation, magnetic circular dichroism and electron magnetic resonance) has been carried out of nanoparticle-containing borate glasses of two different types: (i) with iron and manganese oxide additives and (ii) with iron and rare earth oxide additives. Due to the presence of magnetic nanoparticles, these glasses have a nonlinear magnetic field dependence of magnetization with hysteresis and saturation while remaining transparent in the visible and near-infrared spectral ranges. The nature of the nanoparticles has been identified as manganese ferrite for type (i) glasses and maghemite for type (ii) glasses. The synchrotron radiation studies as well as the computer-assisted electron magnetic resonance provide an insight into the morphological characteristics of the magnetic nanoparticles in the glass.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Martyanov O. N.
Заглавие : Probing flocculant-induced asphaltene precipitation via NMR imaging: from model toluene-asphaltene systems to natural crude oils
Коллективы : Russian Science Foundation [15-19-00119]
Место публикации : Appl. Magn. Reson.: Springer, 2016. - Vol. 47, Is. 2. - P.223-235. - ISSN 0937-9347, DOI 10.1007/s00723-015-0741-9. - ISSN 1613-7507(eISSN)
Примечания : Cited References:46. - This research was performed with the financial support of Russian Science Foundation (project no. 15-19-00119).
Предметные рубрики: PETROLEUM ASPHALTENES
MOLECULAR-DYNAMICS
AGGREGATION
MICROSCOPY
SCATTERING
RESONANCE
SEDIMENTATION
ASSOCIATION
CALORIMETRY
RELAXATION
Аннотация: An nuclear magnetic resonance (NMR) imaging approach for studying flocculant-induced asphaltene precipitation processes is introduced in this report. Unlike commonly accepted techniques, which primarily measure aggregation processes on the submicron scale (the level of asphaltene molecules and their aggregates), NMR imaging demonstrates the capability to obtain new useful information about bulk system behavior on the macro scale. To reveal the capabilities of the method, the model toluene-asphaltene system and two samples of natural crude oils with different chemical composition and physical properties (such as asphaltene content and density) were employed for experiments. The process of colloidal suspension formation and two different patterns of its evolution were observed depending on both the asphaltene content and the flocculant concentration. In the first pattern, the flocculant-induced precipitation leads to the slow uniform compacting of the suspension and descent of the sedimentation front, whereas the second pattern is characterized by sediment accumulation and the upwards drift of the front. It was found that the behavior of the precipitated asphaltenes in the model system correlates well with those observed in natural crude oils. The results achieved in this work are in agreement with the data obtained previously via other techniques. Thus, NMR imaging proved to be an efficient method for probing flocculant-induced precipitation in crude oils.
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13.

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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rudakova N. V., Bikbaev R. G., Pankin P. S., Vetrov S. Ya., Timofeev I. V., Chen, Kuo-Ping, Lee, Wei
Заглавие : Metal-dielectric polarization-preserving anisotropic mirror for chiral optical Tamm state
Коллективы : RFBRRussian Foundation for Basic Research (RFBR); MOST [19-52-52006]; Higher Education Sprout Project of the National Yang Ming Chiao Tung University; Ministry of Science and Technology (MOST)Ministry of Science and Technology, China [108-2923-E-009-003-MY3]
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 2. - Ст.234. - ISSN 2079-4991(eISSN), DOI 10.3390/nano12020234
Примечания : Cited References: 46. - The reported study was funded by RFBR and MOST according to the research project No. 19-52-52006. This work was also supported by the Higher Education Sprout Project of the National Yang Ming Chiao Tung University and Ministry of Education and the Ministry of Science and Technology (MOST) No. 108-2923-E-009-003-MY3
Предметные рубрики: PLASMON
MODES
PHASE
ABSORPTION
RESONANCE
Аннотация: This numerical study demonstrates the possibility of exciting a chiral optical Tamm state localized at the interface between a cholesteric liquid crystal and a polarization-preserving anisotropic mirror conjugated to a metasurface. The difference of the proposed structure from a fully dielectric one is that the metasurface makes it possible to decrease the number of layers of a polarization-preserving anisotropic mirror by a factor of more than two at the retained Q-factor of the localized state. It is shown that the proposed structure can be used in a vertically emitting laser.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Bogdanov A. A., Bulgakov E. N.
Заглавие : Optical bistability with bound states in the continuum in dielectric gratings
Коллективы : Government of the Russian Federation through the ITMO Fellowship; Ministry of Science and Higher Education of Russian Federation, goszadanie [2019-1246]; RFBRRussian Foundation for Basic Research (RFBR) [18-32-20205]
Место публикации : Phys. Rev. A. - 2020. - Vol. 102, Is. 3. - Ст.033511. - ISSN 2469-9926, DOI 10.1103/PhysRevA.102.033511. - ISSN 2469-9934(eISSN)
Примечания : Cited References: 53. - This work was financially supported by the Government of the Russian Federation through the ITMO Fellowship and Professorship Program. A.A.B. also acknowledges support by the Ministry of Science and Higher Education of Russian Federation, goszadanie No. 2019-1246 and RFBR (18-32-20205)
Предметные рубрики: COUPLED-MODE THEORY
WAVE-GUIDE
TRANSITION
RESONANCE
ARRAYS
Аннотация: We consider light scattering by dielectric gratings supporting optical bound states in the continuum. Due to the presence of instantaneous Kerr nonlinearity critical field enhancement in the spectral vicinity of the bound state triggers the effect of optical bistability. The onset of bistability is explained theoretically in the framework of the temporal coupled-mode theory. As the central result we cast the problem in the form of a single field-driven nonlinear oscillator. The theoretical results are verified in comparison with numerical simulations.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mo H. D., Nelson C. S., Bezmaternykh L. N., Temerov V. T.
Заглавие : Magnetic structure of the field-induced multiferroic GdFe3(BO3)(4)
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic structure of the field-induced multiferroic GdFe 3(BO3)4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2008. - Vol. 78, Is. 21. - Ст.214407. - ISSN 1098-0121, DOI 10.1103/PhysRevB.78.214407
Примечания : Cited References: 35. - We thank W. Schoenig, D. Coburn, S. Wilkins, and J. Hill for their support at X22C, S. LaMarra for his support at X21, and D. Connor for a critical reading of the manuscript. Use of the National Synchrotron Light Source, Brookhaven National Laboratory was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
X-RAY-SCATTERING
POLARIZATION DEPENDENCE
EXCHANGE SCATTERING
RESONANCE
FERROELECTRICITY
Ключевые слова (''Своб.индексиров.''): ferromagnetic materials--gadolinium compounds--iron compounds--magnetic structure--multiferroics--neel temperature--spin dynamics--x-ray scattering
Аннотация: We report a magnetic x-ray scattering study of the field-induced multiferroic GdFe3(BO3)(4). Resonant x-ray magnetic scattering at the Gd L-II,L-III edges indicates that the Gd moments order at T-N approximate to 37 K. The magnetic structure is incommensurate below T-N, with the incommensurability decreasing monotonically with decreasing temperature until a transition to a commensurate magnetic phase is observed at T approximate to 10 K. Both the Gd and Fe moments undergo a spin reorientation transition at T-SR approximate to 9 K such that the moments are oriented along the crystallographic c axis at low temperatures. With magnetic field applied along the a axis, our measurements suggest that the field-induced polarization phase has a commensurate magnetic structure with Gd moments rotated similar to 45 degrees toward the basal plane, which is similar to the magnetic structure of the Gd subsystem observed in zero field between 9 and 10 K, and the Fe subsystem has a ferromagnetic component in the basal plane.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Pankrats A. I., Popov M. A., Balaev A. D., Velikanov D. A., Vorotynov A. M., Sablina K. A., Roessli B., Schefer J., Amato A., Staub U., Boehm M., Ouladdiaf B.
Заглавие : Magnetic properties of copper metaborate CuB2O4
Место публикации : Low Temp. Phys. - 2002. - Vol. 28, Is. 8-9. - P.606-612. - ISSN 1063-777X, DOI 10.1063/1.1511704; \b Физика низких температур
Примечания : Cited References: 17
Предметные рубрики: SINGLE-CRYSTALS
RESONANCE
STATE
Аннотация: The results of experimental research on the magnetic and resonance properties, heat capacity, muon spin relaxation, and neutron scattering of single-crystal copper metaborate CuB2O4 are reviewed. The results of a symmetry analysis and of modeling by the method of the phenomenological thermodynamic potential are presented. The magnetic structure of the crystal in various temperature intervals of the magnetic ordering region is discussed. (C) 2002 American Institute of Physics.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golosovsky, I., V, Mukhin A. A., Skumryev V., Boehm M., Schmidt W., Regnault, L-P, Gudim I. A.
Заглавие : Magnetic excitations and exchange interactions in the substituted multiferroics (Nd,Tb)Fe3(BO3)4 revealed by inelastic neutron scattering
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [20-02-00109]; Russian Science FoundationRussian Science Foundation (RSF) [16-12-10531]
Место публикации : Phys. Rev. B. - 2021. - Vol. 103, Is. 21. - Ст.214412. - ISSN 2469-9950, DOI 10.1103/PhysRevB.103.214412. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 40. - We are very grateful to Dr. A. Ivanov, Dr. D. Aristov, Dr. A. Mirmelstein, and Dr. E. Clementiev for fruitful discussions, which significantly expanded our understanding of the problem. The work was supported by the Russian Foundation for Basic Research (Grant No. 20-02-00109). A.A.M. acknowledges the financial support from the Russian Science Foundation (Grant No. 16-12-10531)
Предметные рубрики: RESONANCE
Аннотация: Inelastic neutron scattering spectra in the antiferromagnetic ferroborates Nd1−xTbxFe3(BO3)4 (x = 0, 0.1, 0.2, and 1) reveal various magnetic excitations of the interacting iron and rare-earth subsystems. We observe an evolution of the magnetic system from “easy-plane”, in the Tb-free (x = 0) case, to “easy-axis” anisotropy for samples substituted with Tb. The spectra show hybridized Fe and Nd branches, which are determined by the Fe-Nd exchange splitting of the ground-state Nd3+ doublet. In the easy-plane configuration, near the Brillouin zone center, there are two different pairs of anticrossing quasiacoustic Fe and Nd modes in contrast to the easy-axis state, where the two corresponding pairs of the branches are degenerated. The high-energy (exchange) branches are similar in both spin configurations. The Ising-type anisotropy of the Tb ion prevents the magnetic moment from precession. The increasing of the Tb content changes the effective magnetic anisotropy and stabilizes the easy-axis state. The spin-wave dispersion in the substituted and pure TbFe3(BO3)4 compounds, which have the same, easy-axis magnetic structure, but different crystal symmetry, strongly differ. The observed spectra were analysed in the frame of linear spin-wave theory and the exchange parameters were determined.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lundin A. A., Zobov V. E.
Заглавие : Asymptotic similarity of time correlation functions and shape of the 13C and 29Si NMR spectra in diamond and silicon
Коллективы : Institute of Chemical Physics of the Russian Academy of Science [0082-2018-0005, TSITIS AAAA-A18-118020690203]
Место публикации : J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 2. - P.305-315. - ISSN 1063-7761, DOI 10.1134/S1063776118080216. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 47. - We thank V.A. Atsarkin, V.V. Demidov, F.S. Dzheparov, and E. B. Feldman for the discussion of our results. This work was supported by a subsidy allocated by the Institute of Chemical Physics of the Russian Academy of Science for the State assignment, theme 0082-2018-0005, code TSITIS AAAA-A18-118020690203.
Предметные рубрики: SPIN SYSTEMS
LINE-SHAPES
RELAXATION
SOLIDS
PARAMAGNETS
RESONANCE
Аннотация: Based on the proposed theory, we have investigated the shape of the NMR absorption spectra for 13C and 29Si nuclei in diamond and silicon crystals attributable to the internuclear dipole–dipole interaction. In accordance with the available experimental data, we have considered both crystals with a 100% content of magnetoactive isotopes and crystals with a comparatively low dilution by nonmagnetic nuclei. The time correlation functions (the first of which is the Fourier transform of the NMR spectrum) arising in an infinite chain of coupled differential equations are shown to be mutually similar with a slight time delay. The proposed theory allows the spectrum to be calculated analytically. The results obtained agree satisfactorily with the experimental ones. It is noted that the mutual similarity of the time correlation functions is probably a corollary of the development of dynamical chaos in the system.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzmenko A. M., Dziom V., Shuvaev A., Pimenov A., Schiebl M., Mukhin A. A., Ivanov V. Y., Gudim, I. A., Bezmaternykh L. N., Pimenov A.
Заглавие : Large directional optical anisotropy in multiferroic ferroborate
Место публикации : Phys. Rev. B: American Physical Society, 2015. - Vol. 92, Is. 18. - Ст.184409. - ISSN 10980121 (ISSN), DOI 10.1103/PhysRevB.92.184409
Примечания : Cited References: 44. - This work was supported by the Russian Foundation for Basic Research (14-02-91000, 15-02-07647, 14-02-00307, 13-02-12442, 15-42-04186), Sci. school-924.2014.2, and by the Austrian Science Fund (I815-N16, I1648-N27, W1243)
Предметные рубрики: DICHROISM
BIREFRINGENCE
RFe3(BO3)4
POLARIZATION
EXCITATIONS
RESONANCE
Cr2O3
Аннотация: One of the most fascinating and counterintuitive recent effects in multiferroics is directional anisotropy, the asymmetry of light propagation with respect to the direction of propagation. In such case the absorption in a material can be different for opposite directions. Besides absorption, different velocities of light for different directions of propagation may be also expected, which is termed directional birefringence. In this work, we demonstrate large directional anisotropy in multiferroic samarium ferroborate. The effect is observed for linear polarization of light in the range of millimeter wavelengths, and it survives down to low frequencies. The dispersion and absorption close to the electromagnon resonance can be controlled by external magnetic field and are fully suppressed in one direction. By changing the geometry of the external field, samarium ferroborate shows giant optical activity, which makes this material a universal tool for optical control: with a magnetic field as an external parameter it allows switching between two functionalities: polarization rotation and directional anisotropy.
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