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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belobrov P. I., Tretyakov A. G., Zaslavsky G. M.
Заглавие : Methods of nonlinear dynamics and equilibrium structures of magnetoelastic chains
Разночтения заглавия :авие SCOPUS: Methods of nonlinear dynamics and equilibrium structures of magnetoelastic chains
Место публикации : J. Stat. Phys. - 1985. - Vol. 38, Is. 1-2. - P.393-404. - ISSN 0022-4715, DOI 10.1007/BF01017869
Примечания : Cited References: 22
Ключевые слова (''Своб.индексиров.''): chaos--incommensurate structure--magnetoelastic interaction--nonlinear resonance
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berman G. P., Iomin A. M.
Заглавие : Nonlinear dynamics technique and spatial structures of quantum one-dimensional chains
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1985. - Vol. 89, Is. 3. - P.946-958. - ISSN 0044-4510
Примечания : Cited References: 27
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Averyanov E. M., Adomenas P. V., Zhuikov V. A., Zyryanov V. Ya.
Заглавие : Orientational melting of low chains of molecules and nature of the nematic-smectic A-phase transition
Место публикации : JETP Letters. - 1986. - Vol. 43, Is. 2. - P.117-120. - ISSN 0021-3640
Примечания : Cited References: 13
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Roessli B., Fischer P., Schefer J., Buhrer W., Furrer A., Vogt T., Petrakovskii G. A., Sablina K. A.
Заглавие : Elastic and inelastic neutron study of CuGeO3
Место публикации : J. Phys.: Condens. Matter. - 1994. - Vol. 6, Is. 41. - P.8469-8477. - ISSN 0953-8984, DOI 10.1088/0953-8984/6/41/009
Примечания : Cited References: 18
Предметные рубрики: SPIN-PEIERLS TRANSITION
CHAINS
Аннотация: Elastic and inelastic neutron scattering was used to probe the structural and magnetic properties of polycrystalline CuGeO3. The diffraction data show that the chemical lattice remains stable in the measured temperature range 1.5 K less-than-or-equal-to T less-than-or-equal-to 296 K. At low temperature the inelastic experiments revealed a well defined magnetic excitation at 15 meV, which persists up to T = 50 K. The analysis of the spin-wave spectrum is based on a one-dimensional Heisenberg model within the spin-wave theory. On the other hand, no evidence of energy-gap opening, which would result from a dimerization of the Cu chains, could be found at low temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Petrakovskii G. A.
Заглавие : Investigation of the magnetic properties of chains with alternating ferro- and antiferromagnetic exchange interactions in the Heisenberg model with spin S=1/2
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 1999. - Vol. 41, Is. 9. - P1511-1512. - ISSN 1063-7834, DOI 10.1134/1.1131042
Примечания : Cited References: 11
Предметные рубрики: HALDANE-GAP
SYSTEMS
Аннотация: The quantum Monte Carlo method is used to calculate the susceptibility and pairwise spin-spin correlation functions of chains with alternating ferro (K)- and antiferromagnetic (J)-exchange interactions within the Heisenberg model with spin S=1/2. From the susceptibility, the energy gap between the ground state and excited triplet states is determined for arbitrary ratios K/J. The value of the gap coincides with the Haldane gap for spin S=1 when K/J 1.25. (C) 1999 American Institute of Physics. [S1063-7834(99)02409-0].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Static and dynamic magnetic properties of coupled spin-1/2 antiferromagnetic chains
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2000. - Vol. 12, Is. 37. - P.8191-8207. - ISSN 0953-8984, DOI 10.1088/0953-8984/12/37/316
Примечания : Cited References: 21
Предметные рубрики: ONE-DIMENSIONAL ANTIFERROMAGNETS
SYSTEMS
SUSCEPTIBILITY
EXCITATIONS
SR2CUO3
CA2CUO3
KCUF3
Ключевые слова (''Своб.индексиров.''): computational methods--copper compounds--correlation methods--functions--magnetic field effects--magnetic properties--magnetization--monte carlo methods--quantum theory--specific heat--thermal effects--excitation spectroscopy--interchain coupling--intrachain couplings--mean-field approximation--spin-spin correlation function--spinons--antiferromagnetic materials
Аннотация: Calculations of the thermodynamic quantities, and the spectra of spinons, triplet excitations, and two-particle spin-singlet (Delta S-z = 0, +/- 1) excitations for a weakly coupled antiferromagnetic S = 1/2 spin chain are made using a mean-field approximation for the interchain couplings (J(2)) by the quantum Monte Carlo method. The mass gaps in these excitation spectra are estimated as functions of the interchain coupling. The critical held H-c, and the temperatures at which the spinon and singlet gaps close (T-1 and T-2, respectively) are obtained. Some peculiarities of the staggered magnetization, the specific heat, and the spin-spin correlation function are found at T-1 = 0.9J(2), T-2 = 1.5J(2), H-c = 3.8J(2), as determined by linear function fitting for J(2)/J(1) 0.15 The intrachain and interchain couplings, and the staggered magnetization for KCuF3, Sr2CuO3, and Ca2CuO3 are estimated, and mass gaps are predicted to exist in the spectra of the spinons and the singlet two-particle excitations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Quantum Monte Carlo investigation of the magnetic properties of weakly interacting antiferromagnetic chains with an alternating exchange interaction with spin S=1/2
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2000. - Vol. 90, Is. 1. - P194-201. - ISSN 1063-7761, DOI 10.1134/1.559075
Примечания : Cited References: 35
Предметные рубрики: PEIERLS COMPOUND CUGEO3
MAGNON DISPERSION
BI2CUO4
EXCITATIONS
RESONANCE
SYSTEMS
SCATTERING
DYNAMICS
NEUTRON
PHASE
Аннотация: An approximation dependence of the spontaneous magnetic moment at a site, sigma/sigma(0) - 1 = 0.71(6)delta(2.5(2)), and the antiferromagnet-singlet state phase boundary, J(2)/J(1) = 0.52(3)delta, are determined by the quantum Monte Carlo method in the self-consistent sublattice molecular field approximation for weakly interacting (J(2)) antiferromagnetic chains with spin S = 1/2 and alternating exchange interaction (J(1) +/- delta). The Neel temperature and a number of critical temperatures which could be related with the filling energy of two singlets (Delta S-z = 0) and one triplet (Delta S-z= 1) spin bands, each of which is split by the sublattice field (h(x,y)not equal h(z)) into two subbands, are determined on the basis of the computed correlation radii of the two- and four-spin correlation function, the squared total spin (S-z)(2) with respect to the longitudinal components, the dimerization parameter, and the correlation functions between the nearest neighbors with respect to longitudinal and transverse spin components. On the basis of the Monte Carlo calculations, the critical temperatures and possible energy gaps at the band center are determined for the antiferromagnets CuWO4 and Bi2CuO4 and for the singlet compounds (VO)(2)P2O7 and CuGeO3 , agreeing satisfactorily with existing results, and new effects are also predicted. (C) 2000 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : The study of magnetic properties of the quasi-one-dimensianal spin-1/2 antiferromagnet by Monte-Carlo method
Место публикации : Phys. Low-Dimens. Struct.: V S V CO. LTD, 2000. - Vol. 07.08.2013. - P37-46. - ISSN 0204-3467
Примечания : Cited References: 15
Предметные рубрики: ONE-DIMENSIONAL ANTIFERROMAGNETS
SYSTEMS
CHAINS
CA2CUO3
Аннотация: The thermodynamic quantities, two- and four-spin correlation functions as well as the correlation radius for weakly coupled antiferromagnetic spin chains with S = 1/2 are calculated using the mean-field approximation for the interchain coupling (J(2)) for longitudinal and transverse spin components by quantum Monte Carlo method. Results for the staggered magnetization and Neel temperature are in agreement with general scaling arguments. The value of triplet DeltaS(z) =1 gp in the spectrum of excitations is estimated. The transverse staggered field was found to induce an additional maximum in the correlation radius of the four spin correlation function around T/J(1) approximate to [0.05 divided by 0.075), J(2)/J(1) 0.03.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Two-particle spin-singlet excitations in coupled spin-1/2 antiferromagnetic alternating chains
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2001. - Vol. 13, Is. 14. - P.3403-3410. - ISSN 0953-8984, DOI 10.1088/0953-8984/13/14/313
Примечания : Cited References: 14
Предметные рубрики: MAGNETIC-PROPERTIES
LIGHT-SCATTERING
CUGEO3
S=1/2
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--approximation theory--chemical bonds--electron transport properties--monte carlo methods--particles (particulate matter)--quantum theory--thermal effects--antiferromagnetic alternating chains--excitation spectrum--interchain exchange--mean-field approximation--quantum monte carlo method--singlet gaps--spin-singlet excitations--energy gap
Аннотация: The spectrum of the two-particle spin-singlet (DeltaS(z) = 0, +/-1) excitations of a weakly coupled antiferromagnetic spin-1/2 alternating (J(1) +/- delta) chain is calculated using a mean-field approximation for the interchain exchange (J(2)) by the quantum Monte Carlo method. The bandwidth change of these excitations, the mass gaps in the singlet-singlet excitation spectrum, the top boundaries of the bands and the velocities of these excitations are estimated as functions of the alternating bond delta. The temperatures at which the singlet gaps close are determined.
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10.

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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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Bayukov O. A., Vasil'ev A. D., Velikanov D. A., Ivanova N. B., Kazak N. V., Ovchinnikov S. G., Abd-Elmeguid M. M., Rudenko V. V.
Заглавие : Magnetic and electrical properties of Fe1.91V0.09BO4 warwickite
Разночтения заглавия :авие SCOPUS: Magnetic and electrical properties of Fe1.91V 0.09BO4 warwickite
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 97, Is. 5. - P989-995. - ISSN 1063-7761, DOI 10.1134/1.1633954
Примечания : Cited References: 22. - This study was supported in part by the Russian Foundation for Basic Research (project no. 03-02-16286) and by the Federal Program “Integration” (project no. B0017)
Предметные рубрики: ELECTRONIC-STRUCTURE
CRYSTAL-STRUCTURE
FE2OBO3
CHAINS
FE2BO4
FEBO3
Ключевые слова (''Своб.индексиров.''): electric conductivity--magnetic variables measurement--magnetization--single crystals--hopping conductivity--warwickite--iron compounds
Аннотация: We have performed a complex investigation of the structure and the magnetic and electrical properties of a warwickite single crystal with the composition Fe1.91V0.09BO4 . The results of Mossbauer measurements at T = 300 K indicate that there exist "localized" (Fe2+, Fe3+) and "delocalized" (Fe2.5+) states distributed over two crystallographically nonequivalent positions. The results of magnetic measurements show that warwickite is a P-type ferrimagnet below T = 130 K. The material exhibits hopping conductivity involving strongly interacting electrons. The experimental data are analyzed in comparison to the properties of the initial (unsubstituted) Fe2BO4 warwickite. The entire body of data on the electric conductivity and magnetization are interpreted on a qualitative basis. (C) 2003 MAIK "Nauka / Interperiodica".
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Bezmaternykh L. N., Bayukov O. A., Popov M. A., Schefer J., Neidermayer C., Aleshkevich P., Szymczak R.
Заглавие : Magnetic structure and magnetic excitations in the two-dimensional spin system of the Cu3B2O6 compound
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 7. - P1315-1320. - ISSN 1063-7834, DOI 10.1134/S1063783407070207
Примечания : Cited References: 21
Предметные рубрики: LONG-RANGE ORDER
HEISENBERG-MODEL
GROUND-STATE
GAP
ANTIFERROMAGNET
SRCU2(BO3)(2)
CUGEO3
CHAINS
CAV4O9
Аннотация: This paper reports on the results of measurements of the magnetic susceptibility, heat capacity, neutron scattering, muon spin relaxation, and electron paramagnetic resonance in Cu3B2O6 for the study of the ground state of the spin system of this compound. The results obtained suggest that, at a temperature of 10 K, the spin subsystem of the crystal, which consists of single spins and clusters of pairs and fours of spins interacting with one another, undergoes a transition to a state representing a superposition of the singlet (for clusters) and magnetically ordered (for single spins) states.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : The incommensurate magnetic structure of a tetragonal antiferromagnet with antisymmetric exchange
Место публикации : J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 6. - P.979-988. - ISSN 1063-7761, DOI 10.1134/S1063776109120097
Примечания : Cited References: 34
Предметные рубрики: FLUCTUATION-INDUCED PHASE
FIELD-INDUCED GAP
COPPER METABORATE
WEAK FERROMAGNETISM
SOLITON LATTICE
SPIN-WAVES
CUB2O4
BA2CUGE2O7
CSCUCL3
CHAINS
Ключевые слова (''Своб.индексиров.''): anti-symmetric--antiferromagnetic sublattices--antiferromagnets--antisymmetric exchange--exchange bonds--ferromagnetic component--ferromagnetic moments--ginzburg-landau functional--incommensurate magnetic structures--mean field approximation--modulation vectors--polarization planes--polarization vectors--symmetry groups--antiferromagnetic materials--antiferromagnetism--crystal orientation--crystal symmetry--ferromagnetic materials--ferromagnetism--magnetic devices--magnetic structure--modulation--polarization--vector spaces--vectors--crystallography
Аннотация: Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg-Landau functional is obtained, which is responsible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasi-antiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modulation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Antisymmetric Exchange in the CuB2O4 A Subsystem
Место публикации : JETP Letters. - 2009. - Vol. 90, Is. 1. - P.55-58. - ISSN 0021-3640, DOI 10.1134/S0021364009130116
Примечания : Cited References: 31
Предметные рубрики: TRANSVERSE MAGNETIC-FIELD
FLUCTUATION-INDUCED PHASE
COPPER METABORATE
ANTIFERROMAGNETIC CHAINS
SOLITON LATTICE
INDUCED GAP
SPIN-WAVES
BA2CUGE2O7
CSCUCL3
MNSI
Аннотация: The space distribution of the components of the microscopic Hamiltonian of the antisymmetric Dzyaloshinskii-Moriya exchange with respect to the exchange bond pairs of the A subsystem of Cu2+ ions in the crystallographic 4b positions of CuB2O4 has been obtained using symmetry analysis. The possibility of the coexistence of two different types of the exchange spatial distribution is demonstrated. The component of the anti-symmetric exchange vector D parallel to the tetragonal axis has a weakly ferromagnetic distribution for all of the directions of the bonds between the nearest magnetic neighbors. Each exchange bond has an additional component of the antisymmetric exchange parallel to the bond projection on the tetragonal plane. The spatial distribution of these components is helicoidal with the modulation vector in the tetragonal crystal plane.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Рассказов, Илья Леонидович, Karpov S. V., Markel V. A.
Заглавие : Nondecaying surface plasmon polaritons in linear chains of silver nanospheroids
Место публикации : Opt. Lett. - 2013. - Vol. 38, Is. 22. - P.4743-4746. - ISSN 0146-9592, DOI 10.1364/OL.38.004743
Аннотация: We consider propagation of surface plasmon polaritons in linear chains of equidistant metallic nanospheroids. We show that, for suitably chosen parameters, the propagation is free of spatial decay in spite of the full account of absorptive losses in the metal. В© 2013 Optical Society of America.
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Рассказов, Илья Леонидович, Markel V. A., Karpov S. V.
Заглавие : Propagation of surface plasmon polaritons in curved 2D chains of nanospheroids
Коллективы : International Conference on Coherent and Nonlinear Optics, International Conference on Lasers, Applications, and Technologies , Российская академия наук, Московский государственный университет им. М.В. Ломоносова
Место публикации : ICONO/LAT 2013 : Advance conference program. - 2013. - P.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karpov S. V., Рассказов, Илья Леонидович
Заглавие : Simulation of conditions for fabrication of optical nanowaveguides in the form of chains of spherical metal nanoparticles by electrostatic functionalization of the process substrate
Место публикации : Colloid J. - 2013. - Vol. 75, Is. 3. - P.279-288. - ISSN 1061-933X, DOI 10.1134/S1061933X13030083
Ключевые слова (''Своб.индексиров.''): deposition of metals--electrical parameter--experimental conditions--nonuniform electric field--ordered structures--selective deposition--single-domain structure--transmission property--deposition--electric fields--mathematical models--metal nanoparticles--photoexcitation--plasmons--sols--substrates
Аннотация: A method is proposed for electrostatic functionalization of substrates used to prepare ordered structures composed of closely spaced plasmon-resonant nanoparticles. The method ensures selective deposition of nanoparticles from the bulk of a colloidal system onto the substrates. This method is based on placing a metal nanotemplate of a required configuration at the opposite side of a substrate, with an electric potential being applied to the template. A mathematical model is developed to ensure that the system parameters responsible for the deposition of metal nanoparticles into ordered single-domain structures on the substrate from a bulk sol in a nonuniform electric field generated by the nanotemplate correspond to the real experimental conditions. Since the degree of imperfection of the synthesized chains governs the applicability of these structures to transmission of the optical excitation at the frequency of the surface plasmon of the particles, the dependence of the degree of imperfection on the physicochemical and electrical parameters of the system is studied using the Brownian-dynamics model. The calculations of the spectral and transmission properties of nanowaveguides of this type are exemplified. В© 2013 Pleiades Publishing, Ltd.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Sadreev A. F.
Заглавие : Symmetry breaking in binary chains with nonlinear sites
Место публикации : Phys. Rev. E. - 2013. - Vol. 88, Is. 3. - Ст.032901. - P. - ISSN 1539-3755, DOI 10.1103/PhysRevE.88.032901
Аннотация: We consider a system of two or four nonlinear sites coupled with binary chain waveguides. When a monochromatic wave is injected into the first (symmetric) propagation channel, the presence of cubic nonlinearity can lead to symmetry breaking, giving rise to emission of antisymmetric wave into the second (antisymmetric) propagation channel of the waveguides. We found that in the case of nonlinear plaquette, there is a domain in the parameter space where neither symmetry-preserving nor symmetry-breaking stable stationary solutions exit. As a result, injection of a monochromatic symmetric wave gives rise to emission of nonsymmetric satellite waves with energies differing from the energy of the incident wave. Thus, the response exhibits nonmonochromatic behavior. В© 2013 American Physical Society.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Карпов, Сергей Васильевич, Рассказов, Илья Леонидович
Заглавие : Моделирование условий синтеза оптических нановолноводов из цепочек сферических металлических наночастиц методом электростатической функционализации технологической подложки
Место публикации : Коллоид. журн. - 2013. - Т. 75, № 3. - С. 308-318. - DOI 10.7868/S0023291213030099
Аннотация: Для получения упорядоченных структур из близкорасположенных плазмонно-резонансных наночастиц предложен электростатический метод функционализации подложек, обеспечивающий избирательное осаждение на них наночастиц из объема коллоидной системы. Метод основан на размещении с обратной стороны подложки металлического наношаблона требуемой конфигурации, на который подается электрический потенциал. Разработана математическая модель, позволяющая определить соответствие условиям реального эксперимента тех параметров системы, которые обеспечивают осаждение металлических наночастиц в одномерные упорядоченные структуры на подложку из объема золя в неоднородном электрическом поле, создаваемом наношаблоном. С помощью модели броуновской динамики исследована зависимость степени дефектности синтезируемых цепочек от физико-химических и электрических параметров системы, определяющая пригодность такого типа структур для передачи оптического возбуждения на частоте поверхностного плазмона частиц. Приведены примеры расчетов спектральных и трансмиссионных свойств нановолноводов данного типа.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gurevich Y. L., Mankov Yu.I., Khlebopros R. G.
Заглавие : Self-assembly of superparamagnetic ferrihydrite nanoparticles
Коллективы : Russian Foundation for Basic Research [08-08-00427_a, 10-08-00278_a]; Siberian Branch, Russian Academy of Sciences, Integration project [21]
Место публикации : Dokl. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2013. - Vol. 58, Is. 11. - P.478-481. - ISSN 1028-3358, DOI 10.1134/S1028335813110104
Примечания : Cited References: 15. - This work was supported by the Russian Foundation for Basic Research, project nos. 08-08-00427_a and 10-08-00278_a, and by the Siberian Branch, Russian Academy of Sciences, Integration project no. 21.
Предметные рубрики: CHAINS
CLUSTERS
Аннотация: A study was conducted to estimate the possibility of formation of chains of superparamagnetic nanoparticles of iron oxyhydroxides synthesized in a bacteria culture. The self-assembly of biogenic nanoparticles distinguished by low values of magnetization and small sizes is assumed to proceed due to the forces of magnetic dipole dipole interaction as an initial mechanism of aggregation and exchange-interaction forces, which provide the stability of chains. The microphotographs demonstrate the self-assembly of anisotropic cobalt-doped ferrihydrite nanoparticles in aggregates of ellipsoidal shape with sizes of about 550 × 300 nm and a platelike shape of 50-100 nm thick. The aggregates, in turn, are combined from blocks, which include a restricted number of nanoparticles of about 5 nm in diameter and have the shape of rods of 50-100 × 12 nm in size. The energy of degaussing fields of chains is reasonably high, which forces them to form two and three dimensional structures in which the compensation of such fields is provided.
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