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Komogortsev, S. V.
Magnetization curve and magnetic correlations in a nanochain of ferromagnetic grains with random anisotropy / S. V. Komogortsev, R. S. Iskhakov // Phys. Solid State. - 2005. - Vol. 47, Is. 3. - P. 495-501, DOI 10.1134/1.1884711. - Cited References: 31 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
NANOCRYSTALLINE FERROMAGNETS
   AMORPHOUS FERROMAGNETS
   FIELD
   MODEL
   MICROSTRUCTURE
   SIMULATIONS
   DEPENDENCE
   SYMMETRY
   SYSTEM
   MEDIA
Аннотация: The magnetization curve and magnetization correlation function are calculated for a ferromagnetic chain of single-domain nanoparticles with a randomly oriented anisotropy axis for different ratios between the exchange correlation and anisotropy energies. It is shown that the coercive force decreases as the exchange correlations increase. For strong exchange correlations, the magnetization curve is described by the following three successive magnetization processes as the applied field is increased: (i) nonuniform rotation of the magnetization of stochastic domains, (ii) collapse of the magnetic solitons, and (iii) nonuniform rotation of exchange-correlated magnetization vectors of the nanoparticles. For high fields, the calculated correlation function of the transverse magnetization components coincides with that predicted from linear theory. At low and zero fields, the main parameters of the correlation function (the variance and correlation radius) tend to certain finite values rather than diverge (as is the case in linear theory). The irreversible variation in the magnetization at low fields (the hysteresis loop) and the hysteresis of the main parameters of the correlation function are calculated. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Комогорцев, Сергей Викторович
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Patrin, G. S.
Influence of semimetal spacer on magnetic properties in NiFe/Bi/NiFe trilayer films / G. S. Patrin, V. Y. Yakovchuk, D. A. Velikanov // Phys. Lett. A. - 2007. - Vol. 363, Is. 1-2. - P. 164-167, DOI 10.1016/j.physleta.2006.10.088. - Cited References: 19 . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
BISMUTH
SYSTEM
Кл.слова (ненормированные):
semimetal spacer -- magnetization -- spin accumulation -- trilayer film -- Magnetization -- Semimetal spacer -- Spin accumulation -- Trilayer film
Аннотация: The results of experimental study of magnetic properties in permalloy/bismuth/permalloy trilayer films synthesized for the first time are presented. Measurements of magnetic field and temperature dependences of magnetization have shown that the interlayer coupling depends on bismuth spacer thickness. The dependence of saturation magnetization of the system on semimetal thickness has been found. Possible mechanisms responsible for the observed features of behavior are discussed. (c) 2006 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, prospect Svobodny 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Yakovchuk, V. Y.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Патрин, Геннадий Семёнович
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Rotter, I.
Influence of branch points in the complex plane on the transmission through double quantum dots / I. . Rotter, A. F. Sadreev // Phys. Rev. E. - 2004. - Vol. 69, Is. 6. - Ст. 66201, DOI 10.1103/PhysRevE.69.066201. - Cited References: 25 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
ELECTRON-ATOM SCATTERING
   S-MATRIX
   DOUBLE POLES
   CONTINUUM
   SYSTEM
   MODEL
Кл.слова (ненормированные):
Eigenvalues and eigenfunctions -- Hamiltonians -- Mathematical models -- Matrix algebra -- Probability -- Resonance -- Scattering -- Wave propagation -- Branch points -- Open quantum systems -- Propagating modes -- Quantum computing devices -- Semiconductor quantum dots
Аннотация: We consider single-channel transmission through a double quantum dot system consisting of two single dots that are connected by a wire and coupled each to one lead. The system is described in the framework of the S matrix theory by using the effective Hamiltonian of the open quantum system. It consists of the Hamiltonian of the closed system (without attached leads) and a term that accounts for the coupling of the states via the continuum of propagating modes in the leads. This model allows one to study the physical meaning of branch points in the complex plane. They are points of coalesced eigenvalues and separate the two scenarios with avoided level crossings and without any crossings in the complex plane. They influence strongly the features of transmission through double quantum dots.

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Держатели документа:
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement, S-58183 Linkoping, Sweden
Astafev Kransnoyarsk Pedag Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН
Max-Planck-Inst. Phys. Komplexer S., D-01187 Dresden, Germany
Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Department of Physics, Linkoping University, S-581 83 Linkoping, Sweden
Astaf'ev Krasnoyarsk Pedagogical U., 89 Lebedeva, Krasnoyarsk, 660049, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович
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Aver'yanov, E. M.
Fluctuations of orientational order in a uniaxial nematic liquid crystal with biaxial molecules and its response to an external field / E. M. Aver'yanov // Phys. Solid State. - 2003. - Vol. 45, Is. 5. - P. 990-1001, DOI 10.1134/1.1575350. - Cited References: 30 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITION
   SMECTIC-A
   PARTICLES
   SYSTEM
   LANDAU
   MODEL
Аннотация: Homogeneous thermal fluctuations of the orientational order parameters S and G of biaxial molecules in a uniaxial nematic liquid crystal are investigated in the framework of the molecular-statistical theory. It is demonstrated that the molecular biaxiality significantly affects the order parameters S and G, their temperature dependences in the nematic phase, the amplitude and the temperature dependence of the order parameter fluctuations in the nematic and isotropic phases, and the character of the transition from the nematic phase to the isotropic liquid phase. It is established that the fluctuations of the parameters S and G in the nematic phase are related to the temperature dependences of S and G and the susceptibilities chi(S) and chi(G) of the nematic liquid crystal to external fields, which leads to a change in the parameters S and G at a fixed director orientation. Explanations are offered for the known experimental data on the orientational ordering of biaxial molecules under the action of external fields in the isotropic phase of nematic liquid crystals. (C) 2003 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Аверьянов, Евгений Михайлович
}
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Study of magnetic correlations in nanostructured ferromagnets by correlation magnetometry / R. S. Iskhakov [et al.] // JETP Letters. - 2003. - Vol. 78, Is. 10. - P. 646-650, DOI 10.1134/1.1644310. - Cited References: 20 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
AMORPHOUS FERROMAGNETS
   RANDOM ANISOTROPY
   NANOCRYSTALLINE
   SYSTEM
   RIPPLE
Аннотация: We propose a theoretically justified experimental magnetometric technique for determining the size of stochastic domains spontaneously formed in the spin system of nanostructured ferromagnets and for evaluating the effective anisotropy in these magnetically correlated regions. The method is based on monitoring the DeltaM similar to H (-2) relationship in the low-field part of the integral magnetization curve. (C) 2003 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ignatchenko, V. A.; Игнатченко, Вальтер Алексеевич; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Balaev, A. D.; Балаев, Александр Дмитриевич
}
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Impedance spectroscopy of high-molecular poly(ethylene) with carbon nanotubes / N. A. Drokin [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 3. - P. 657-661, DOI 10.1134/S1063783410030303. - Cited References: 14. - This study was supported by the Presidium of the Russian Academy of Sciences (project no. 27.1), the Siberian Branch of the Russian Academy of Sciences (integration project no. 5), and the Council on Grants from the President of the Russian Federation (grant no. 3818.2008.3). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
RELAXATION SPECTRA
   DIELECTRIC SPECTRA
   SYSTEM
   TIMES
Аннотация: The impedance spectra of composite materials based on the high-molecular poly(ethylene) modified by carbon nanotubes have been investigated. A numerical method has been proposed for reconstructing the relaxation time distribution function of the active (R) and reactive (C) elements of a sample directly from the experimentally obtained frequency dependence of the real and imaginary components of the impedance. It has been shown that, with an increase in the concentration of carbon nanotubes, the electrical conductivity of the samples under study increases and their impedance characteristics are described by a nonmonotonic relaxation time distribution function.

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Держатели документа:
[Drokin, N. A.
Fedotova, A. V.
Glushchenko, G. A.
Churilov, G. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Drokin, N. A.; Дрокин, Николай Александрович; Fedotova, A. V.; Glushchenko, G. A.; Глущенко, Гарий Анатольевич; Churilov, G. N.; Чурилов, Григорий Николаевич
}
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Bulgakov, E. N.
Switching through symmetry breaking for transmission in a T-shaped photonic waveguide coupled with two identical nonlinear micro-cavities / E. . Bulgakov, A. . Sadreev // J. Phys.: Condens. Matter. - 2011. - Vol. 23, Is. 31. - Ст. 315303, DOI 10.1088/0953-8984/23/31/315303. - Cited References: 32 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
MODE THEORY
   NUCLEAR REACTIONS
   UNIFIED THEORY
   FIBER
   INSTABILITIES
   RESONANCE
   GRATINGS
   SYSTEM
   STATES
Кл.слова (ненормированные):
All-optical switching -- Anti-symmetric -- Central waveguides -- Coupled mode theory -- Input power -- Input pulse -- Mirror symmetry -- Nonlinear cavities -- Output waveguides -- Photonic waveguides -- Standing wave -- Symmetry-breaking -- Microcavities -- Mirrors -- Waveguides -- Light transmission
Аннотация: Using coupled mode theory we consider transmission in a T-shaped waveguide coupled with two identical symmetrically positioned nonlinear micro-cavities with mirror symmetry. For input power injected into the central waveguide we show the existence of a symmetry breaking solution which is a result of mixing of the symmetrical input wave with an antisymmetric standing wave in the Fabry-Perot interferometer. With growth of the input power, a feature in the form of loops arises in the solution which originates from bistability in the transmission in the output left/right waveguide coupled with the first/second nonlinear cavity. The domains of stability of the solution are found. The breaking of mirror symmetry gives rise to nonsymmetrical left and right outputs. We demonstrate that this phenomenon can be explored for all-optical switching of light transmission from the left output waveguide to the right one by application of input pulses.

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Держатели документа:
[Bulgakov, Evgeny
Sadreev, Almas] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Bulgakov, Evgeny] Siberian State Aerosp Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk Rabochii, Krasnoyarsk 31, Russian Federation

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Mossbauer studies of FexMn1-xS single crystals / G. M. Abramova [et al.] // Phys. Solid State. - 2008. - Vol. 50, Is. 2. - P. 237-240, DOI 10.1134/S1063783408020042. - Cited References: 16 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
METAL-INSULATOR-TRANSITION
   MAGNETIC-PROPERTIES
   ALPHA-MNS
   SULFIDES
   MAGNETORESISTANCE
   PRESSURE
   SYSTEM
   OXIDES
Аннотация: Single crystals of iron manganese sulfides FexMn1-xS (0.25

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Держатели документа:
[Abramova, G. M.
Petrakovskii, G. A.
Bayukov, O. A.
Bovina, A. F.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Varnek, V. A.
Sokolov, V. V.] Russian Acad Sci, Siberian Branch, Nikolaev Inst Inorgan Chem, Novosibirsk 630090, Russia
ИФ СО РАН

Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Petrakovskii, G. A.; Петраковский, Герман Антонович; Bayukov, O. A.; Баюков, Олег Артемьевич; Varnek, V. A.; Sokolov, V. V.; Bovina, A. F.; Бовина, Ася Федоровна
}
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Magnetic properties of Fe3C ferromagnetic nanoparticles encapsulated in carbon nanotubes / S. V. Komogortsev [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 4. - P. 734-738, DOI 10.1134/S1063783407040233. - Cited References: 15 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
IRON NANOPARTICLES
EXCHANGE
SYSTEM
Аннотация: The low-temperature dependences of magnetic characteristics (namely, the coercive force H (c) , the remanent magnetization M (r) , local magnetic anisotropy fields H (a), and the saturation magnetization M (s) ) determined from the irreversible and reversible parts of the magnetization curves for Fe3C ferromagnetic nanoparticles encapsulated in carbon nanotubes are investigated experimentally. The behavior of the temperature dependences of the coercive force H (c) (T) and the remanent magnetization M (r) (T) indicates a single-domain structure of the particles under study and makes it possible to estimate their blocking temperature T (B) = 420-450 K. It is found that the saturation magnetization M (s) and the local magnetic anisotropy field H-a vary with temperature as similar to T-5/2.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Div, Novosibirsk 660090, Russia
Krasnoyarsk State Pedag Univ, Krasnoyarsk 660017, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, ul. Akademika Lavrent'eva 3, Novosibirsk, 660090, Russian Federation
Krasnoyarsk State Pedagogical University, ul. Lebedevoy 79, Krasnoyarsk, 660017, Russian Federation

Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Balaev, A. D.; Балаев, Александр Дмитриевич; Kudashov, A. G.; Okotrub, A. V.; Smirnov, S. I.
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10.

Effect of heterovalent substitution of rare-earth elements on the magnetic and transport properties of YBa2Cu3O7 / M. I. Petrov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 11. - P. 2047-2051, DOI 10.1134/S1063783407110054. - Cited References: 18 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PR
   SUPERCONDUCTIVITY
   CE
   ND
   TRANSITION
   SYSTEM
   LA
Аннотация: The Y(1-x) Ce (x) Ba2Cu3O7 system with low cerium concentrations has been synthesized. The cerium solubility limit measured using x-ray powder diffraction analysis is about 2.4 at. %. The temperature dependences of the magnetization M(T) are measured for samples cooled in a magnetic field (FC) and in a zero field (ZFC). The difference between the magnetizations M-ZFC-M-FC at 77.4 K, which is proportional to the pinning potential, passes through a maximum at x = 0.0156. This concentration corresponds to the average distance (equal to eight lattice constants) between the impurity ions in the plane of the rare-earth elements, which is comparable to the diameter of Abrikosov vortices in YBa2Cu3O7.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfel'd, Yu. S.; Гохфельд, Юлия Сергеевна; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
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