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1.

Вид документа : Статья из журнала
Шифр издания : 53/Z 19
Автор(ы) : Zakharov M. S., Smolyak B. M., Ermakov G. V.
Заглавие : Effect of External Nonuniform Magnetic Field on Flux Creep Process in Superconductor
Место публикации : Journal of Superconductivity and Novel Magnetism. - 2012. - Article in Press. - С. 1-4
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical state--magnetic relaxation --superconductors
Аннотация: The effect of an external nonuniform magnetic field on the flux creep rate in a high-temperature superconductor with trapped magnetic flux was studied. The magnetic relaxation was suppressed when the superconductor was put into a field of permanent magnets or when it approached a ferromagnet. The effect arises when the field sources (being magnetized, the ferromagnet produces its own field) are placed near the superconductor surface, where the flux line ends are located. For these cases, we carried out the calculations of vortex and current density distributions, which demonstrate that reverse currents flow in the near-surface regions of the sample. This verifies the hypothesis suggested earlier about the influence of counter Lorentz forces retarding the creep of the vortices. In the interpretation of the results, we also take into consideration the magnetic force acting on the vortex ends in the external nonuniform magnetic field that allows us to explain the experimental results, in which the current structure in the sample is unipolar
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2.

Вид документа : Статья из журнала
Шифр издания : 53/Z 19
Автор(ы) : Zakharov M. S., Smolyak B. M., Ermakov G. V.
Заглавие : Effect of External Nonuniform Magnetic Field on Flux Creep Process in Superconductor
Место публикации : Journal of Superconductivity and Novel Magnetism. - 2012. - Article in Press. - С. 1-4
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical state--magnetic relaxation --superconductors
Аннотация: The effect of an external nonuniform magnetic field on the flux creep rate in a high-temperature superconductor with trapped magnetic flux was studied. The magnetic relaxation was suppressed when the superconductor was put into a field of permanent magnets or when it approached a ferromagnet. The effect arises when the field sources (being magnetized, the ferromagnet produces its own field) are placed near the superconductor surface, where the flux line ends are located. For these cases, we carried out the calculations of vortex and current density distributions, which demonstrate that reverse currents flow in the near-surface regions of the sample. This verifies the hypothesis suggested earlier about the influence of counter Lorentz forces retarding the creep of the vortices. In the interpretation of the results, we also take into consideration the magnetic force acting on the vortex ends in the external nonuniform magnetic field that allows us to explain the experimental results, in which the current structure in the sample is unipolar
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3.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V., Zakharov M. S.
Заглавие : Retardation of the Magnetic Relaxation in High-Temperature Superconductors Near a Ferromagnet
Место публикации : Journal of Superconductivity and Novel Magnetism. - 2011. - Vol.24, №1-2. - С. 325-329
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): high-t c superconductors --trapped flux --magnetic relaxation
Аннотация: The creep of a magnetic flux trapped in a bulk high-temperature superconductor has been studied. It has been found that the magnetic relaxation is retarded when the superconductor is placed near a ferromagnet. The value of the retardation effect depends on the sequence of magnetization and the approach of the superconductor to a ferromagnet. The magnetic relaxation is fully suppressed when a superconducting sample first is magnetized and then is brought close to a ferromagnet. An interpretation of this effect has been discussed. Being magnetized, a ferromagnet produces its own magnetic field. While penetrating into a disk sample through its planes, the ferromagnet field induces screening currents, which circulate oppositely to the current that arises upon trapping of the magnetic flux. As a result, the stability of the magnetic structure is sharply improved since opposite driving forces can act on different sections of the vortices
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4.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V., Zakharov M. S.
Заглавие : Retardation of the Magnetic Relaxation in High-Temperature Superconductors Near a Ferromagnet
Место публикации : Journal of Superconductivity and Novel Magnetism. - 2011. - Vol.24, №1-2. - С. 325-329
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): high-t c superconductors --trapped flux --magnetic relaxation
Аннотация: The creep of a magnetic flux trapped in a bulk high-temperature superconductor has been studied. It has been found that the magnetic relaxation is retarded when the superconductor is placed near a ferromagnet. The value of the retardation effect depends on the sequence of magnetization and the approach of the superconductor to a ferromagnet. The magnetic relaxation is fully suppressed when a superconducting sample first is magnetized and then is brought close to a ferromagnet. An interpretation of this effect has been discussed. Being magnetized, a ferromagnet produces its own magnetic field. While penetrating into a disk sample through its planes, the ferromagnet field induces screening currents, which circulate oppositely to the current that arises upon trapping of the magnetic flux. As a result, the stability of the magnetic structure is sharply improved since opposite driving forces can act on different sections of the vortices
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5.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V.
Заглавие : Elimination of magnetic relaxation in superconductors on approaching a ferromagnet
Место публикации : Physica C. - 2010. - Vol.470, №3. - С. 218-220
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): magnetic relaxation --ferromagnet--magnetic structure
Аннотация: It is found that magnetic relaxation is suppressed in a high-temperature superconductor when it approaches a ferromagnet. It is supposed that this phenomenon results from formation of a nonequilibrium magnetic structure, in which counter driving forces act in different regions
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6.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V.
Заглавие : Elimination of magnetic relaxation in superconductors on approaching a ferromagnet
Место публикации : Physica C. - 2010. - Vol.470, №3. - С. 218-220
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): magnetic relaxation --ferromagnet--magnetic structure
Аннотация: It is found that magnetic relaxation is suppressed in a high-temperature superconductor when it approaches a ferromagnet. It is supposed that this phenomenon results from formation of a nonequilibrium magnetic structure, in which counter driving forces act in different regions
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7.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V., Chubraeva L. I.
Заглавие : The effect of ac magnetic fields on the lifting power of levitating superconductors
Место публикации : Superconductor Science and Technology. - 2007. - Vol.20, №4. - С. 406-411
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): levitation force --superconducting suspension --lifting force
Аннотация: This study deals with the decrease in the levitation force under the action of an ac field up to the frequency at which oscillations of the superconducting suspension are limited by inertia. The lifting force was measured as a function of the ac field amplitude and the exposure time. It was shown that the force quickly decreased at the moment the ac field was applied and then continued diminishing, but at a lower rate. A qualitative model was proposed, taking into account two effects of the ac field on the magnetization of the levitating superconductor: a complete destruction of the critical state in some section of the superconductor (to a depth λac) and the initiation of a faster magnetic relaxation in the region where the induction gradient is preserved
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8.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V., Chubraeva L. I.
Заглавие : The effect of ac magnetic fields on the lifting power of levitating superconductors
Место публикации : Superconductor Science and Technology. - 2007. - Vol.20, №4. - С. 406-411
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): levitation force --superconducting suspension --lifting force
Аннотация: This study deals with the decrease in the levitation force under the action of an ac field up to the frequency at which oscillations of the superconducting suspension are limited by inertia. The lifting force was measured as a function of the ac field amplitude and the exposure time. It was shown that the force quickly decreased at the moment the ac field was applied and then continued diminishing, but at a lower rate. A qualitative model was proposed, taking into account two effects of the ac field on the magnetization of the levitating superconductor: a complete destruction of the critical state in some section of the superconductor (to a depth λac) and the initiation of a faster magnetic relaxation in the region where the induction gradient is preserved
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9.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Perelshtein G. N., Ermakov (Yermakov) G. V.
Заглавие : Effects of relaxation in levitating superconductors
Место публикации : Cryogenics. - 2002. - Vol.42, №10. - С. 635-644
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superconductors--flux creep -- magnetic levitation
Аннотация: The effect of the magnetic flux creep on the levitation stability of high-temperature superconductors was studied. It was shown experimentally that under a unipolar magnetization the levitation force decreased at a logarithmic velocity characteristic of the creep process. If the current structure was bi- or multi-polar one, which was formed in a sample exposed to a reversing external magnetic field, the force remained unchanged during a certain period of time. The theory of relaxation of magnetization and force for a partial and full penetration of the critical state was considered. It was shown that relaxation decelerated sharply if the region with a current producing the main magnetization was far from the superconductor surface. A concept of an open and internal magnetic relaxation was introduced. The time of the internal relaxation for different reverse depths was estimated. The calculated values approached the experimental values of the levitation stabilization time
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10.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Perelshtein G. N., Ermakov (Yermakov) G. V.
Заглавие : Effects of relaxation in levitating superconductors
Место публикации : Cryogenics. - 2002. - Vol.42, №10. - С. 635-644
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superconductors--flux creep -- magnetic levitation
Аннотация: The effect of the magnetic flux creep on the levitation stability of high-temperature superconductors was studied. It was shown experimentally that under a unipolar magnetization the levitation force decreased at a logarithmic velocity characteristic of the creep process. If the current structure was bi- or multi-polar one, which was formed in a sample exposed to a reversing external magnetic field, the force remained unchanged during a certain period of time. The theory of relaxation of magnetization and force for a partial and full penetration of the critical state was considered. It was shown that relaxation decelerated sharply if the region with a current producing the main magnetization was far from the superconductor surface. A concept of an open and internal magnetic relaxation was introduced. The time of the internal relaxation for different reverse depths was estimated. The calculated values approached the experimental values of the levitation stabilization time
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