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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: APLESNIN S. S.
Заглавие
: CRITICAL-BEHAVIOR OF DILUTED ISING
MAGNETS
WITH ANISOTROPIC EXCHANGE INTERACTION DISTRIBUTION
Место публикации
: Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1984. - Vol. 26, Is. 11. - P3355-3361. - ISSN 0367-3294
Примечания
: Cited References: 19
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Cherkasskii M., Farle M., Semisalova A.
Заглавие
: Nutation resonance in ferromagnets
Место публикации
: Phys. Rev. B. - 2020. - Vol. 102, Is. 18. - Ст.184432. - ISSN 24699950 (ISSN),
DOI
10.1103/PhysRevB.102.184432
Примечания
: Cited References: 42. - We thank Benjamin Zingsem for helpful discussions. In part funded by Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Projects No. 405553726 (CRC/TRR 270) and No. 392402498 (SE 2853/1-1)
Аннотация:
The inertial dynamics of magnetization in a ferromagnet is investigated theoretically. The analytically derived dynamic response upon microwave excitation shows two peaks: ferromagnetic and nutation resonances. The exact analytical expressions of frequency and linewidth of the magnetic nutation resonance are deduced from the frequency-dependent susceptibility determined by the inertial Landau-Lifshitz-Gilbert equation. The study shows that the dependence of nutation linewidth on the Gilbert precession damping has a minimum, which becomes more expressive with increase of the applied magnetic field.
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Klauss H. H., Luetkens H., Klingeler R., Hess C., Litterst F. J., Kraken M., Korshunov M. M., Eremin I., Drechsler S. L., Khasanov R., Amato A., Hamann-Borrero J. E., Leps N., Kondrat A., Behr G., Werner J., Buchner B.
Заглавие
: Commensurate spin density wave in LaFeAsO: A local probe study
Место публикации
: Phys. Rev. Lett.: AMER PHYSICAL SOC, 2008. - Vol. 101, Is. 7. - Ст.77005. - ISSN 0031-9007,
DOI
10.1103/PhysRevLett.101.077005
Примечания
: Cited References: 28
Предметные рубрики:
LAYERED QUATERNARY COMPOUND
SUPERCONDUCTIVITY
Ключевые слова
(''Своб.индексиров.''): arsenic compounds--chlorine compounds--ferromagnetism--magnetic materials--magnetic properties--magnetization--
magnets
--molybdenum--phase transitions--spin density waves--commensurate spin density wave--external fields--magnetic orders--muon spin relaxations--order parameter--ordered moments--probe measurements--ssbauer spectroscopy--structural phase transition--sublattice magnetizations--temperature dependences--spin dynamics
Аннотация:
We present a detailed study on the magnetic order in the undoped mother compound LaFeAsO of the recently discovered Fe-based superconductor LaFeAsO(1-x)F(x). In particular, we present local probe measurements of the magnetic properties of LaFeAsO by means of (57)Fe Mossbauer spectroscopy and muon-spin relaxation in zero external field along with magnetization and resistivity studies. These experiments prove a commensurate static magnetic order with a strongly reduced ordered moment of 0.25(5)mu(B) at the iron site below T(N)=138 K, well separated from a structural phase transition at T(S)=156 K. The temperature dependence of the sublattice magnetization is determined and compared to theory. Using a four-band spin density wave model both, the size of the order parameter and the quick saturation below T(N) are reproduced.
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4.
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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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kablov E. N., Piskorskii V. P., Valeev R. A., Volkov N. V., Davydova E. A., Shaikhutdinov K. A., Balaev D. A., Semenov S. V.
Заглавие
: Effect of copper on the properties of Pr-Dy-Fe-Co-B sintered
magnets
Место публикации
: Russ. Metall. (Metally): Pleiades Publishing, 2014. - Vol. 2014, Is. 1. - P.55-59. - ISSN 0036-0295,
DOI
10.1134/S0036029514010078. - ISSN 1555-6255
Примечания
: Cited References: 15
Аннотация:
The effect of copper on the properties of
magnets
(Pr0.52Dy0.48)13(Fe65Co0.35)80.3 - xCuxB6.7 (x = 0-10) has been studied. Alloying with copper is shown to decrease the sintering temperature and to increase the content of the principal (Pr,Dy)2(Fe,Co)14B magnetic phase. For compositions with x = 1.3-3.3, copper is found to affect the value and sign of the temperature induction coefficient (TIC). It is shown that the effect of copper on the TIC is determined by the substitution of copper ions for iron ions in lattice sites, which are coupled via an antiferromagnetic exchange interaction. © 2014 Pleiades Publishing, Ltd.
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Shustin M. S., Potkina M. N.
Заглавие
: Effective easy-axis anisotropy of the two-sublattice single-chain magnet with twisted easy planes
Коллективы
: Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" [20-1-4-25-1, 19-1-1-12-2]
Место публикации
: Nanosyst. - Phys. Chem. Math. - 2020. - Vol. 11, Is. 6. - P.659-665. - ISSN 2220-8054,
DOI
10.17586/2220-8054-2020-11-6-659-665; Наносистемы: физ., хим., матем. - ISSN 2305-7971(eISSN)
Примечания
: Cited References: 15. - S. M. S. expresses deep gratitude to V. V. Val'kov. The main results of this work were with substantial use of the theory developed by him (see for example articles [10], [12] and references given in them), as well as on his previous advice. S. M. S. and M. N. P. acknowledges the support from the Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" (Grants No. 20-1-4-25-1 and 19-1-1-12-2, respectively)
Аннотация:
An analytical solution for the spin-wave spectrum of the two-sublattice 1D magnet with SA = SB = 1 and twisting easy planes has been obtained. Such planes are mutually twisted by an angle φ relative to each other. For the case of mutually orthogonal easy planes φ = π/2, the spectrum vs. quasi-momentum dependence has been compared with that of an easy-axis magnet with the easy axis aligned along the line of intersection of the planes. An analogy of the spectra of the models has been shown, indicating the possibility of the effective easy axis anisotropy in easy-plane two-sublattice single-chain
magnets
.
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7.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Ignatchenko V.A.
Заглавие
: Effects of correlated inhomogeneities of the spectral properties of disordered ferro
magnets
and superlattices
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.300 (Invited)
РИНЦ
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Koblischka, Michael R., Koblischka-Veneva, Anjela, Gokhfeld D. M., Naik, S. Pavan Kumar, Nouailhetas, Quentin, Berger, Kevin, Douine, Bruno
Заглавие
: Flux pinning docking interfaces in satellites using superconducting foams as trapped field
magnets
Коллективы
: ANRFrench National Research Agency (ANR); DFGGerman Research Foundation (DFG)European Commission [ANR-17-CE05-0030, DFG-ANR Ko2323-10]
Место публикации
: IEEE Trans. Appl. Supercond. - 2022. - Vol. 32, Is. 4. - Ст.4900105. - ISSN 1051-8223,
DOI
10.1109/TASC.2022.3147734. - ISSN 1558-2515(eISSN)
Примечания
: Cited References: 44. - This work was supported in part by SUPERFOAM international project funded by ANR and DFG under Grants ANR-17-CE05-0030 and DFG-ANR Ko2323-10.
Предметные рубрики:
BULK
RECONFIGURATION
MAGNETIZATION
Аннотация:
Flux-Pinning Docking Interfaces (FPDI) in satellite systems were developed using bulk superconductors and permanent
magnets
in previous works. However, such FPDIs have limited magnetic field strength, consist of heavy-weight material, and can only be used with a single purpose, i.e., as chasing or docking satellite. Replacing the magnetic material in the FPDI by a trapped field (TF)-magnet would enable the interface to operate for both purposes, i.e., generating a (stronger) magnetic field and trapping it. We show the requirements for such a system and discuss the possible gains when using a TF-FPDI in satellites. To reduce the system weight, the use of superconducting foams as superconducting material is discussed in detail. Furthermore, the use of superconducting foams, the size of which can be easily upscaled, may also comprise the function of the damping material, so even more weight could be saved for the payload.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Komogortsev S. V., Iskhakov R. S.
Заглавие
: Law of approach to magnetic saturation in nanocrystalline and amorphous ferromagnets with improved transition behavior between power-law regimes
Коллективы
: Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации
: J. Magn. Magn. Mater.: Elsevier, 2017. - Vol. 440. - P.213-216. - ISSN 03048853 (ISSN),
DOI
10.1016/j.jmmm.2016.12.145
Примечания
: Cited References: 41. - The work has been supported by Russian Foundation for Basic Research, Grant nos. 16-03-00256, 15-08-06673 and RFBR-KRFS 15–42-04171.
Ключевые слова
(''Своб.индексиров.''): ferromagnetic materials--ferromagnetism--magnetic anisotropy--magnetism--
magnets
--nanocrystals--perturbation techniques--asymptotic regimes--law of approaches--nanocrystalline and amorphous--perturbation theory--power law regime--random magnetic anisotropies--transition behavior--transition modes--saturation magnetization
Аннотация:
New law of the approach to magnetic saturation is proposed based on scaling in ferromagnets with random magnetic anisotropy. This law is consistent with the known laws derived within perturbation theory in extreme cases, but it describes the transition mode between the power-low asymptotic regimes better. The improved law is proper for reliable fitting the approach magnetization to saturation in nanocrystalline and amorphous ferromagnets. © 2017 Elsevier B.V.
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10.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kuzmin E. V.
Заглавие
: Ground-state and excitation spectrum of disordered heisenberg
magnets
Место публикации
: Zhurnal Eksperimentalnoi Teor. Fiz. - 1984. - Vol. 86, Is. 3. - P.981-994. - ISSN 0044-4510
Примечания
: Cited References: 21
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11.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kveglis L. I., Abylkalykova R. B., Noskov F. M., Arkhipkin V. G., Musikhin V. A., Cherepanov V. N., Niavro A. V.
Заглавие
: Local electron structure and magnetization in beta-Fe86Mn13C
Коллективы
: International Conference on Nano-structures Self-Assembling
Разночтения заглавия
:авие SCOPUS: Local electron structure and magnetization in β- Fe86Mn13C
Место публикации
: Superlattices Microstruct. - 2009. - Vol. 46, Is. 1-2. - P.114-120. - ISSN 0749-6036,
DOI
10.1016/j.spmi.2008.11.023
Примечания
: Cited References: 12
Предметные рубрики:
PHASE
Ключевые слова
(''Своб.индексиров.''): frank-kasper structure--local electron structure--spin-polarized electronic conditions--frank-kasper structure--local electron structure--spin-polarized electronic conditions--austenite grain--austenitic--c-steel--close packed structures--dynamic loadings--electron structures--frank-kasper structure--induction method--intergranular--local electron structure--local electronic structures--local magnetization--self-consistent field--spin-polarized electronic conditions--transition regions--austenite--diffraction--electronic structure--electrons--
magnets
--manganese--manganese compounds--optical microscopy--phase transitions--spin dynamics--steel--textures--magnetization--frank-kasper structure--local electron structure--spin-polarized electronic conditions--austenite grain--austenitic--c-steel--close packed structures--dynamic loadings--electron structures--frank-kasper structure--induction method--intergranular--local electron structure--local electronic structures--local magnetization--self-consistent field--spin-polarized electronic conditions--transition regions--austenite--diffraction--electronic structure--electrons--
magnets
--manganese--manganese compounds--optical microscopy--phase transitions--spin dynamics--steel--textures--magnetization
Аннотация:
The aim of the work is to elucidate the origin of magnetization presence in austenitic Fe86Mn13C steel after dynamic loading. The observation of microstructures in the region of transition from FCC austenitic Fe86Mn13C steel to FK12 + FK14 type of Frank-Kasper tetrahedral close packed structure is described. We used the methods of optical microscopy, electron microscopy, electron diffraction and X-ray-diffraction to investigate the phase transition region. Changes of local magnetization were estimated by induction method. To explain the magnetization origin of the sample consisting of austenite grains and intergranular layers, which have Frank-Kasper's structure (FK12 + FK14) typical of beta-Fe-Mn, the local electronic structure has been investigated for intergranular layers. The local electron structure of FK12 and FK14 clusters have been simulated by method of self-consistent field to understand the nature of non-zero magnetization of the Fe87Mn13 alloy exposed by shock deformation. It was shown, that numbers of states with upward and downward spins are not equal. Therefore the occurrence of magnetization is possible. (c) 2009 Published by Elsevier Ltd
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12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Yakubailik E. K., Ganzhenko I. M., Butov P. Y., Kilin V. I.
Заглавие
: Losses of magnetite iron in wet separation
Место публикации
: Steel Transl.: Allerton Press Incorporation, 2016. - Vol. 46, Is. 6. - P.390-394. - ISSN 09670912 (ISSN),
DOI
10.3103/S0967091216060115
Примечания
: Cited References: 15
Ключевые слова
(''Своб.индексиров.''): high-power
magnets
--iron losses--magnetic parameters--magnetite iron--tailings--wet separation
Аннотация:
Samples of all the tailings from enrichment processes at the Abagur plant operated by OAO Evrazruda are studied. The tailings are subjected to magnetic and chemical analysis, and the magnetic characteristics of the products are measured. The mean magnetite iron content in the tailings was about 0.9% in 2013. Experiments confirm that the main magnetite losses are associated with small classes and their poor magnetic properties. The losses of magnetite are reduced as the separation field is increased. At the plant, 45% of the barium–ferrite magnetic systems in the PBM 90/250 separators have been replaced by a system based on neodymium–iron–boron composites, with increase in the field from 111 to 175 kA/m. Modernization of the magnetic systems in all the separators at the Abagur plant is recommended. In thickening, the installation of separators for regeneration of the suspensions, with a field of 190 kA/m, is recommended. After reconstruction, the losses of magnetite iron at the plant may be reduced to 0.45–0.55%. © 2016, Allerton Press, Inc.
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Shaykhutdinov K. A., Popkov S. I., Semenov S. V., Balaev D. A., Dubrovskiy A. A., Sablina K. A., Sapronova N. V., Volkov N. V.
Заглавие
: Low-temperature resistance and magnetoresistance hysteresis in polycrystalline (La0.5Eu0.5)(0.7)Pb0.3MnO3
Разночтения заглавия
:авие SCOPUS: Low-temperature resistance and magnetoresistance hysteresis in polycrystalline (La0.5Eu0.5)0.7Pb 0.3MnO3
Место публикации
: J. Appl. Phys.: AMER INST PHYSICS, 2011. - Vol. 109, Is. 5. - Ст.53711. - ISSN 0021-8979,
DOI
10.1063/1.3559303
Примечания
: Cited References: 20. - This study was partially supported by the Russian Foundation for Basic Research, Project No. 08-02-00259a and the Lavrentyev Competition of the Young Scientists' Projects of the Siberian Branch of the Russian Academy of Sciences, Project No. 12.
Предметные рубрики:
RESISTIVITY MINIMUM
MANGANITES
FILMS
Ключевые слова
(''Своб.индексиров.''): antiferromagnets--electrical resistances--ferromagnets--field dependence--inter-grain--lanthanum manganites--low temperatures--low-temperature resistance--polycrystalline--temperature dependence--tunnel contacts--antiferromagnetic materials--europium--ferromagnetic materials--ferromagnetism--hysteresis--lead--magnetic field effects--magnetoelectronics--magnetoresistance--
magnets
--manganese oxide--paramagnetism--superconducting materials--electric resistance
Аннотация:
The behavior of temperature dependences of electrical resistance and magnetoresistance of polycrystalline substituted lanthanum manganite (La0.5Eu0.5)(0.7)Pb0.3MnO3 at low temperatures was thoroughly studied. A broad hysteresis was found in the field dependences of electrical resistance in the low-temperature region. Above 40 K, no hysteresis feature was observed. The temperature T = 40 K corresponds to the temperature of minimum electrical resistance and the temperature T-N to the antiferromagnet-paramagnet phase transition of the material of the intergrain boundaries. In this work we propose a model which explains the observed features of the rho(T) and rho(H) curves at temperatures below T-N by the formation of a network of ferromagnet-antiferromagnet-ferromagnet tunnel contacts. (C) 2011 American Institute of Physics. [doi:10.1063/1.3559303]
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Varnakov S. N., Komogortsev S. V., Ovchinnikov S. G., Bartolome J., Sese J.
Заглавие
: Magnetic properties and nonmagnetic phases formation in (Fe/Si)(n) films
Коллективы
:
Разночтения заглавия
:авие SCOPUS: Magnetic properties and nonmagnetic phases formation in (Fe/Si) n films
Место публикации
: J. Appl. Phys.: AMER INST PHYSICS, 2008. - Vol. 104, Is. 9. - Ст.94703. - ISSN 0021-8979,
DOI
10.1063/1.3005973
Примечания
: Cited References: 23. - This work was supported by the Russian Academy of Science program "Spintronics," the complex integration project of the Siberian Branch of the Russian Academy of Science. 3.5, the Russian Foundation for Basic Research (Grant No. 07-03-00320), the "Ramon y Cajal" program, and Project No. MAT 2005/01272 of the Spanish Ministry of Education and Science.
Предметные рубрики:
FE/SI/FE TRILAYER FILMS
GIANT MAGNETORESISTANCE
ULTRAHIGH-VACUUM
SUPERLATTICES
MULTILAYERS
EXCHANGE
Ключевые слова
(''Своб.индексиров.''): activation energy--integral equations--magnetic properties--magnetization--
magnets
--multilayers--rate constants--silicon--thermal evaporation--vacuum--vacuum evaporation--fe layers--high temperatures--interface layers--irreversible behaviors--kinetic equations--n films--nonmagnetic--nonmagnetic phases--prefactor--quantitative analysis--rate equations--synthetic procedures--temperature dependences--ultrahigh-vacuum systems--phase interfaces
Аннотация:
The magnetization of Fe/Si multilayers, grown by thermal evaporation in an ultrahigh vacuum system, was investigated at high temperatures. Magnetization and its temperature dependence up to a high temperature of 800 K depend on individual Fe layer thickness d(Fe). This dependence is the result of the formation of an Fe-Si interface layer (nonmagnetic phase) during the synthetic procedure. The fraction of this Fe-Si nonmagnetic phase is estimated versus dFe. At temperatures higher than 400 K an irreversible decrease in the magnetization occurs. A quantitative analysis of this irreversible behavior is proposed in terms of an exponential diffusion-like kinetic equation for the reaction that produces the Fe-Si nonmagnetic phase. The coefficients of the rate equation are the activation energy E(a) and the prefactor D(0), which have been determined for different d(Fe). (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3005973]
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: MARTYNOV S. N.
Заглавие
: CORRELATION-FUNCTIONS AND ELECTRON-SPIN-RESONANCE LINEWIDTH OF TWO-DIMENSIONAL HEISENBERG
MAGNETS
Место публикации
: Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1986. - Vol. 28, Is. 10. - P3006-3011. - ISSN 0367-3294
Примечания
: Cited References: 15
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Martynov S. N.
Заглавие
: Single-ion-anisotropy and electron-spin-resonance linewidth in quasi-low-dimensional heisenberg
magnets
Место публикации
: Phys. Status Solidi B. - 1988. - Vol. 146, Is. 2. - P.691-696. - ISSN 0370-1972,
DOI
10.1002/pssb.2221460229
Примечания
: Cited References: 18
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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Perlepe, Panagiota, Oyarzabal, Itziar, Mailman, Aaron, Yquel, Morgane, Platunov M. S., Dovgaliuk, Iurii, Rouzieres, Mathieu, Negrier, Philippe, Mondieig, Denise, Suturina, Elizaveta A., Dourges, Marie-Anne, Bonhommeau, Sebastien, Musgrave, Rebecca A., Pedersen, Kasper S., Chernyshov, Dmitry, Wilhelm, Fabrice, Rogalev, Andrei, Mathoniere, Corine, Clerac, Rodolphe
Заглавие
: Metal-organic
magnets
with large coercivity and ordering temperatures up to 242°C
Коллективы
: University of Bordeaux; Region Nouvelle AquitaineRegion Nouvelle-Aquitaine; Quantum Matter Bordeaux; Centre National de la Recherche Scientifique (CNRS)Centre National de la Recherche Scientifique (CNRS); Basque GovernmentBasque Government; VILLUM FONDEN [15374]; Academy of FinlandAcademy of Finland [289172]
Место публикации
: Science. - 2020. - Vol. 370, Is. 6516. - P.587-591. - ISSN 0036-8075,
DOI
10.1126/science.abb3861. - ISSN 1095-9203(eISSN)
Примечания
: Cited References: 42. - This work was supported by the University of Bordeaux, the Region Nouvelle Aquitaine, Quantum Matter Bordeaux, and the Centre National de la Recherche Scientifique (CNRS). I.O. and R.C. are grateful to the Basque Government for I.O.'s postdoctoral grant. K.S.P. thanks the VILLUM FONDEN for a Villum Young Investigator grant (15374). A.M. thanks JYU and the Academy of Finland (project 289172) for support
Предметные рубрики:
ROOM-TEMPERATURE
CHROMIUM
FERROMAGNETISM
DIFFRACTION
COMPLEXES
Аннотация:
Magnets
derived from inorganic materials (e.g., oxides, rare-earth–based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic
magnets
suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation
magnets
relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of lightweight, molecule-based
magnets
by postsynthetic reduction of preassembled coordination networks that incorporate chromium metal ions and pyrazine building blocks. The resulting metal-organic ferrimagnets feature critical temperatures up to 242°C and a 7500-oersted room-temperature coercivity.
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18.
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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19.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Edelman I. S., Ivanova O. S., Ivantsov R. D., Petrakovskaja E. A., Zabluda V. N., Hennet L., Thiaudiere D., Saboungi M. -L., Stepanov S., Artemenko A., Kliava J.
Заглавие
: Nanoparticle-containing oxide glasses: transparent
magnets
Коллективы
: International Conference on the Chemistry of Glasses and Glass-Forming Melts, Society of Glass Techology
Место публикации
: Int. Conf. on the Chem. of Glas. and Glass-Form. Melts: In celebration of the 300th Annuversary of the birth of Mikhail Vasilievich Lomonosov, 4-8 Sept., 2011 : abstracts. - 2011. - P.13
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Balaev D. A., Dubrovskiy A. A., Popkov S. I., Shaikhutdinov K. A., Mart'yanov O. N., Petrov M. I.
Заглавие
: Nonmonotonic Behavior of Magnetoresistance, R(H) Hysteresis, and Low-Temperature Heat Capacity of the BaPb0.75Bi0.25O3 Superconductor in a Magnetic Field: Possible Manifestations of Phase Separation
Коллективы
:
Разночтения заглавия
:авие SCOPUS: Nonmonotonic behavior of magnetoresistance, R(H) hysteresis, and low-temperature heat capacity of the BaPb0.75Bi0.25O 3 superconductor in a magnetic field: Possible manifestations of phase separation
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 110, Is. 4. - P584-593. - ISSN 1063-7761,
DOI
10.1134/S1063776110040059
Примечания
: Cited References: 27. - This study was performed under the program no. 5 of the Russian Academy of Sciences (project no. 7).
Предметные рубрики:
ELECTRONIC SPECIFIC-HEAT
BAPB1-XBIXO3 SYSTEM
YBA2CU3O7-DELTA
COMPOSITES
TRANSITION
HTSCS
300-K
Ключевые слова
(''Своб.индексиров.''): diamagnetic response--effective field--heat capacities--high-t--hysteretic dependence--josephson--low temperature heat capacities--non-monotonic dependence--nonmonotonic behaviors--polycrystalline--spatially inhomogeneous--transport currents--electric resistance--hysteresis--magnetic field effects--magnetic flux--magnetoelectronics--magnetoresistance--phase separation--semiconductor metal boundaries--specific heat--superconducting
magnets
--superconducting materials--superconductivity--transport properties--magnetic materials
Аннотация:
The transport properties (R(T) and R(H) dependences at various values of the transport current in magnetic fields up to 65 kOe) and low-temperature heat capacity in magnetic fields up to 90 kOe of the BaPb0.75Bi0.25O3 superconductor (T-C approximate to 11.3 K) are investigated with the goal of clarifying the mechanisms determining the nonmonotonic behavior and hysteresis of its magnetoresistance R(H). The type of R(H) hysteretic dependences for BaPb0.75Bi0.25O3 is analogous to that observed in granular high-T-c superconductors (HTSCs); however, unlike classical HTSC systems, the field width of the magnetoresistance hysteresis loop for polycrystalline BaPb0.75Bi0.25O3 depends on the transport current. This means that although the mechanisms responsible for the magnetoresistance hysteresis (the influence of the magnetic flux trapped in super-conducting regions on the effective field in Josephson interlayers) are identical in these objects, the transport current in BaPb0.75Bi0.25O3 may considerably affect the diamagnetic response of the superconductor. A considerable effect of transport current on the field in which the R(H) dependences have a peak and exhibit hysterestic properties is observed. Such a behavior can be adequately interpreted using the model of the spatially inhomogeneous superconductor-insulator state proposed by Gorbatsevich et al. [JETP Lett. 52, 95 (1990)]. The nonmonotonic dependence of quantity C/T (C is the heat capacity) on the magnetic field discovered in the present study also agrees with the conclusions based on this model.
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