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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Spin polarization in quantum dots by radiation field with circular polarization
Место публикации : JETP Letters. - 2001. - Vol. 73, Is. 10. - P.505-509. - ISSN 0021-3640, DOI 10.1134/1.1387515
Примечания : Cited References: 25
Предметные рубрики: 2-DIMENSIONAL ELECTRON-GAS
RANDOM MAGNETIC-FIELD
ORBIT INTERACTION
TRANSPORT
BARRIERS
MAGNETORESISTANCE
PHASE
Аннотация: For circular quantum dot (QD), taking into account the Razhba spin-orbit interaction (SOI), an exact energy spectrum is obtained. For a small SOI constant, the eigenfunctions of the QD are found. It is shown that the application of a radiation field with circular polarization removes the Kramers degeneracy of the QD eigenstates. Effective spin polarization of electrons transmitted through the QD owing to a radiation field with circular polarization is demonstrated. (C) 2001 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fransson J., Eriksson O., Sandalov I.
Заглавие : Many-body approach to spin-dependent transport in quantum dot systems
Место публикации : Phys. Rev. Lett.: AMERICAN PHYSICAL SOC, 2002. - Vol. 88, Is. 22. - Ст.226601. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.88.226601
Примечания : Cited References: 37
Предметные рубрики: SINGLE-ELECTRON TRANSISTOR
COULOMB-BLOCKADE
ANDERSON IMPURITY
ROOM-TEMPERATURE
TUNNEL-JUNCTIONS
EVEN NUMBER
MODEL
MAGNETORESISTANCE
OSCILLATIONS
CONDUCTANCE
Аннотация: By means of a diagram technique for Hubbard operators, we show the existence of a spin-dependent renormalization of the localized levels in an interacting region, e.g., quantum dot, modeled by the Anderson Hamiltonian with two conduction bands. It is shown that the renormalization of the levels with a given spin direction is due to kinematic interactions with the conduction subbands of the opposite spin. The consequence of this dressing of the localized levels is a drastically decreased tunneling current for ferromagnetically ordered leads compared to that of paramagnetically ordered leads. Furthermore, the studied system shows a spin-dependent resonant tunneling behavior for ferromagnetically ordered leads.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mahesh R., Sander D., Zharkov S. M., Kirschner J.
Заглавие : Stress and growth of Ag monolayers on a Fe(100) whisker
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2003. - Vol. 68, Is. 4. - Ст.45416. - ISSN 1098-0121, DOI 10.1103/PhysRevB.68.045416
Примечания : Cited References: 42
Предметные рубрики: FCC-FE FILMS
MAGNETIC SUPERLATTICES
ULTRATHIN FILMS
OSCILLATIONS
CU(100)
SANDWICHES
INTERLAYER
LAYERS
MAGNETORESISTANCE
INTERFACE
Аннотация: In situ stress measurements have been performed during the deposition of epitaxial Ag monolayers on a Fe whisker. A compressive stress of -0.6 GPa is measured above a 5-ML Ag thickness which is ascribed to the epitaxial misfit of -0.8% between Ag and Fe. Back-extrapolation of the coverage dependent stress measurements to zero coverage reveals an Ag-induced change of the surface stress of Fe(100) of -1.23 N/m. Comparing this surface stress change with the calculated surface stress for Ag(100) suggests a tensile surface stress of +2.05 N/m for clean Fe(100). The deposition of 2 - 5 layers of Ag does not change the stress induced by the first layer significantly. This almost stress free growth is assigned to a rougher surface morphology which is most likely caused by a surface alloy formation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khalyapin D. L., Kim J., Stolyar S. V., Turpanov I. A., Kim P. D., Kim I.
Заглавие : Formation of 4H-closely packed structure in thin films of metastable nanocrytalline Co13Cu87 alloy
Разночтения заглавия :авие SCOPUS: Formation of 4H-closely packed structure in thin films of metastable nanocrystalline Co13Cu87 alloy
Место публикации : Solid State Commun. - 2003. - Vol. 128, Is. 6-7. - P.209-212. - ISSN 0038-1098, DOI 10.1016/j.ssc.2003.08.018
Примечания : Cited References: 10
Предметные рубрики: MAGNETORESISTANCE
Ключевые слова (''Своб.индексиров.''): nanocrystalline materials--metals--metastable solid solution--ion impact--metals--nanocrystalline materials--metastable solid solution--ion impact--crystal lattices--nanostructured materials--solid solutions--thin films--ion polishing--cobalt alloys
Аннотация: The crystal structure of the thin films of metastable Co13Cu87 alloy prepared by magnetron sputtering was investigated by transmission electron microscope. As-deposited films have a nanocrystal structure with an fcc lattice. As a result of the prolonged ion polishing with a beam of Ar ions with the energy of 4.7 keV, the four-layer 4H dhcp structure was formed. (C) 2003 Elsevier Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Polyakova K. P., Bondarenko G. N., Polyakov V. V.
Заглавие : Self-propagating high-temperature synthesis and magnetic features of Fe-Al2O3 granulated films
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 1. - P138-140. - ISSN 1063-7834, DOI 10.1134/1.1537424
Примечания : Cited References: 15
Предметные рубрики: THIN-FILMS
MAGNETORESISTANCE
Аннотация: The classical solid-phase reaction between Fe2O3 and Al layers in thin films is initiated. It is shown that, in the reaction products, Fe granulated films are formed in the Al2O3 nonconducting matrix. Analysis of the reaction equation demonstrates that the volume fraction of iron in the granulated films is less than the percolation threshold. This determines the magnetic properties of iron clusters in a superparamagnetic state. It is assumed that the nanocrystalline microstructure exists in thin films after solid-phase reactions proceeding under conditions of self-propagating high-temperature synthesis. (C) 2003 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fransson J., Holmstrom E., Eriksson O., Sandalov I.
Заглавие : Theory of spin filtering through quantum dots
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2003. - Vol. 67, Is. 20. - Ст.205310. - ISSN 1098-0121, DOI 10.1103/PhysRevB.67.205310
Примечания : Cited References: 28
Предметные рубрики: DEPENDENT TUNNELING JUNCTIONS
NARROW ENERGY BANDS
ELECTRON CORRELATIONS
MAGNETORESISTANCE
BARRIER
POLARIZATION
Аннотация: Using a nonequilibrium diagram technique for Hubbard operator Green functions combined with a generalization of the transfer Hamiltonian formalism, we calculate the transport through a magnetic quantum dot system with spin-dependent couplings to the contacts. In specific regimes of the parameter space the spin-dependent tunnel current becomes more than 99.95% spin polarized, suggesting that a device thus constructed can be used in spin-filter applications. First-principles electronic structure calculations show the existence of nanostructured systems, such as, e.g., MgO/Fe/Pd(5)/Fe/MgO (001), with the desired properties in the direction of the current.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ryabinkina L. I., Abramova G. M., Romanova O. B., Kiselev N. I.
Заглавие : Hall effect in the FexMn1-xS magnetic semiconductors
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 6. - P1068-1072. - ISSN 1063-7834, DOI 10.1134/1.1767246
Примечания : Cited References: 17
Предметные рубрики: MAGNETORESISTANCE
FIELDS
MNS
Аннотация: The electrical properties and the Hall effect in the FexMn1-xS magnetic semiconductors (0less than or equal toxless than or equal to0.5) have been experimentally studied in the range 77-300 K in magnetic fields of up to 15 kOe. The cation-substituted sulfides with 0.25less than or equal toxless than or equal to0.3 possessing colossal magnetoresistance (CMR) were established to be narrow-gap semiconductors with carrier concentrations nsimilar to10(11)-10(15) cm(-3) and high carrier mobilities musimilar to 10(2)-10(4) cm(2) V-1 s(-1). It is believed that the CMR effect in these sulfides can be explained in terms of the model of magnetic and electron phase separation, which is analogous to the percolation theory in the case of heavily doped semiconductors. (C) 2004 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Abramova G. M., Romanova O. B., Kiselev N. I., Bovina A. F.
Заглавие : Spin-dependent transport in alpha-MnS single crystals
Разночтения заглавия :авие SCOPUS: Spin-dependent transport in α-MnS single crystals; авие SCOPUS: Spin-dependent transport in ?-MnS single crystals
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2004. - Vol. 46, Is. 11. - P2067-2072. - ISSN 1063-7834, DOI 10.1134/1.1825551; Phys. Solid State. - 2004. - Vol. 46, Is. 11. - P2067-2072. - Вариант Sopus
Примечания : Cited References: 11
Предметные рубрики: MAGNETORESISTANCE
Аннотация: The electrical resistivity of single crystal alpha-MnS in crystallographic directions [111] and [100] was found to be anisotropic in the temperature interval 77-300 K. The change in activation energy below the Neel temperature was determined. Magnetoresistance was revealed, and reversal of its sign in the (111) plane above the Neel point was found. The experimental data are analyzed in terms of the s-d model, with the manganese ion holes interacting with localized spins assumed to be free carriers. (C) 2004 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Petrakovskii G. A., Patrin K. G., Sablina K. A., Eremin E. V., Vasiliev V., Vasiliev A., Molokeev M. S., Boni P., Clementyev E.
Заглавие : Intrinsic inhomogeneity in a (La0.4Eu0.6)(0.7)Pb0.3MnO3 single crystal: Magnetization, transport, and electron magnetic resonance studies
Разночтения заглавия :авие SCOPUS: Intrinsic inhomogeneity in a (La0.4 Eu0.6) 0.7 Pb0.3 MnO3 single crystal: Magnetization, transport, and electron magnetic resonance studies
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2006. - Vol. 73, Is. 10. - Ст.104401. - ISSN 1098-0121, DOI 10.1103/PhysRevB.73.104401
Примечания : Cited References: 29
Предметные рубрики: INSULATOR-METAL TRANSITION
PHASE-SEPARATION
MAGNETORESISTANCE
MANGANITES
EXCHANGE
STATE
Аннотация: Conventional magnetic and transport measurements of the melt-grown mixed-valence manganite (La0.4Eu0.6)(0.7)Pb0.3MnO3 have been supplemented by a magnetic resonance study. The experimental data support the model of two magnetic phases coexisting in the crystal volume. At a temperature T-*, which is well above Curie temperature T-C, ferromagnetic clusters appear in the sample. These ferromagnetic regions possess a higher conductivity in comparison with the paramagnetic background (majority phase). On cooling through T-C, the magnetization of the spatially confined ferromagnetic clusters of the minority phase freezes in random directions with respect to the magnetization of the ferromagnetic majority phase due to the difference of the exchange interactions at the phase boundaries from the intraphase interactions in sign and value. Such a mixed state is responsible for the observed magnetic glassylike behavior of the system that is characteristic of inhomogeneous magnets. The fluctuations of the magnetic coupling value and sign in the sample volume are related to strong competition between the ferromagnetic and antiferromagnetic exchange interactions, which, in turn, results from the quenched disorder caused by the random chemical replacement of the perovskite A site of the manganite. A phase-separation state comprised of two different ferromagnetic phases has been used to account for the colossal magnetoresistance phenomenon and the magnetic-field-driven nonlinear conduction found in the crystal.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Popkov S. I., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Mechanisms of dissipation in a Josephson medium based on a high-temperature superconductor in a magnetic field
Разночтения заглавия :авие SCOPUS: Mechanisms of dissipation in a josephson medium based on a high-temperature superconductor in a magnetic field
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 5. - P826-832. - ISSN 1063-7834, DOI 10.1134/S1063783406050039
Примечания : Cited References: 32
Предметные рубрики: RESISTIVE TRANSITION
PHASE-SLIP
TRANSPORT-PROPERTIES
MAGNETORESISTANCE
SYSTEM
MODEL
YBA2CU3O7-X
PENETRATION
COMPOSITES
HYSTERESIS
Аннотация: This paper reports on the results of an investigation into the influence of magnetic fields (0-60 kOe) on the temperature dependences of the electrical resistance R(T) of the Y3/4Lu1/4Ba2Cu3O7 + CuO composites. The structure of these composites is considered to be a network of tunnel-type Josephson junctions in which a nonsuperconducting component (CuO) forms boundaries (barriers) between high-temperature superconducting crystallites. The temperature dependence R(T) of the composites has two steps characteristic of granular superconductors: (i) an abrupt change in the electrical resistance at the critical temperature of high-temperature superconducting crystallites and (ii) a smooth transition to the superconducting state under the influence of the boundaries between the crystallites. The experimental dependences R(T) are analyzed within the Ambegaokar-Halperin model of thermal fluctuations in Josephson junctions and the flux creep model. An increase in the magnetic field leads to a crossover from the Ambegaokar-Halperin mechanism to the flux creep mechanism. The temperature dependences R(T) in the range of weak magnetic fields (from 0 to 10(2) Oe) are adequately described by the relationship following from the Ambegaokar-Halperin model. In the range of strong magnetic fields (from 10(3) to 6 x 10(4) Oe), the dissipation obeys the Arrhenius law R similar to exp(-U(H)/T)], which is characteristic of the flux creep model with a temperature-independent pinning energy U(H). The effective Josephson coupling energies and the pinning energies corresponding to the Ambegaokar-Halperin and flux creep mechanisms are determined.
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