Structure of the mixed state induced in thin YBaCuO superconducting films by the field of a small ferromagnetic particle

Aladyshkin, A. Yu.; Vorob'ev, A. Kh.; Vysheslavtsev, P. P.; Klyuenkov, E. B.; Mel’nikov, A. S.; Nozdrin, Yu. N.; Tokman, I. D.

doi:10.1134/1.558935

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…It is important to notice that, in the case of superconducting films infinite in the lateral direction and cooled in zero magnetic field, a spontaneously induced vortex should be accompanied by an antivortex in order to provide flux conservation imposed by Maxwell's equations 14 . The destruction of the Meissner state in a zero-field-cooled superconducting film was theoretically studied by Mel'nikov et al [155] and Aladyshkin et al [156]. In this case the formation of the mixed state occurs via the penetration of vortex semi-loops which split into vortex-antivortex pairs.…”

Section: Creation Of Vortices By the Stray Field Of A Magnetic Dipolementioning

confidence: 99%

“…The threshold distance Z * d = Z * d (T ), corresponding to the suppression of the energy barrier can be experimentally detected by measuring a nonzero remanent magnetization as long as pinning is relevant. Interestingly, such a non-contact technique allows one to estimate the depairing current density and its temperature dependence in thin superconducting YBa 2 Cu 3 O 7 films [155,156,158]. Since the surface energy barrier in superconductors with a flat surface is known to be suppressed by applying an external field of the order of the critical thermodynamical field H cm = 0 /(2 √ 2πλξ) [43], one can get a rough criterion for the persistence of the vortex-free state in the presence of a magnetic dipole: m 0 /Z 3 d H cm .…”

Section: Creation Of Vortices By the Stray Field Of A Magnetic Dipolementioning

confidence: 99%

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Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

Aladyshkin

Silhanek

Gillijns

et al. 2009

Supercond. Sci. Technol.

217

143

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Abstract. The theoretical and experimental results concerning the thermodynamical and low-frequency transport properties of hybrid structures, consisting of spatially-separated conventional low-temperature superconductor (S) and ferromagnet (F), is reviewed. Since the superconducting and ferromagnetic parts are assumed to be electrically insulated, no proximity effect is present and thus the interaction between both subsystems is through their respective magnetic stray fields. Depending on the temperature range and the value of the external field Hext, different behavior of such S/F hybrids is anticipated. Rather close to the superconducting phase transition line, when the superconducting state is only weakly developed, the magnetization of the ferromagnet is solely determined by the magnetic history of the system and it is not influenced by the field generated by the supercurrents. In contrast to that, the nonuniform magnetic field pattern, induced by the ferromagnet, strongly affect the nucleation of superconductivity leading to an exotic dependence of the critical temperature Tc on Hext. Deeper in the superconducting state the effect of the screening currents cannot be neglected anymore. In this region of the phase diagram various aspects of the interaction between vortices and magnetic inhomogeneities are discussed. In the last section we briefly summarize the physics of S/F hybrids when the magnetization of the ferromagnet is no longer fixed but can change under the influence of the superconducting currents. As a consequence, the superconductor and ferromagnet become truly coupled and the equilibrium configuration of this "soft" S/F hybrids requires rearrangements of both, superconducting and ferromagnetic characteristics, as compared with "hard" S/F structures. Some figures in this paper are in color only in the electronic version.

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Section: Creation Of Vortices By the Stray Field Of A Magnetic Dipolementioning

confidence: 99%

Section: Creation Of Vortices By the Stray Field Of A Magnetic Dipolementioning

confidence: 99%

Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

Aladyshkin

Silhanek

Gillijns

et al. 2009

Supercond. Sci. Technol.

217

143

View full text Add to dashboard Cite

show abstract

“…These authors reported that regardless of the presence of an additional applied homogeneous magnetic field, vortices may self-organize into a variety of defect-free conformal configurations, depending on the thermomagnetic history. Although the behavior of superconducting films under inhomogeneous fields has been studied before, theoretically 40 and experimentally, 41,42 particularly in the context of superconductor/ferromagnetic hybrids, [43][44][45][46][47] an experimental investigation was still lacking, on how field cooling in homogeneous and inhomogeneous out-of-plane field configurations affects the screening capacity of a macroscopic superconducting film.…”

mentioning

confidence: 99%

Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field

Chaves

Araújo

Carmo

et al. 2021

Applied Physics Letters

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Quantitative magneto-optical imaging of a type-II superconductor thin film cooled under zero, homogeneous, and inhomogeneous applied magnetic fields indicates that the latter procedure leads to an enhancement of the screening capacity. Such an observation is corroborated by both B-independent and B-dependent critical state model analyses. Furthermore, repulsive (attractive) vortex-(anti)vortex interactions were found to have a decisive role in the shielding ability, with initial states prepared with vortices resulting in a shorter magnetic flux front penetration depth than those prepared with antivortices. The proposed strategy could be implemented to boost the performance of thin superconducting devices.

show abstract

“…These authors reported that, regardless of the presence of an additional applied homogeneous magnetic field, vortices may self-organize into a variety of defect-free conformal configurations, depending on the thermomagnetic history. Although the behavior of superconducting films under inhomogeneous fields has been studied before, theoretically 34 and experimentally, 35,36 particularly in the context of superconductor/ferromagnetic hybrids, [37][38][39][40][41] an experimental investigation was still lacking, on how field cooling in homogeneous and inhomogeneous out-of-plane field configurations affects the screening capacity of a macroscopic superconducting film.…”

mentioning

confidence: 99%

Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field

Chaves,

de Araújo,

Carmo

et al. 2021

Preprint

View full text Add to dashboard Cite

Quantitative magneto-optical imaging of a type-II superconductor thin film cooled under zero, homogeneous, and inhomogeneous applied magnetic fields, indicates that the latter procedure leads to an enhancement of the screening capacity. Such an observation is corroborated by both B-independent and B-dependent critical state model analyses. Furthermore, repulsive (attractive) vortex-(anti)vortex interactions were found to have a decisive role in the shielding ability, with initial states prepared with vortices resulting in a shorter magnetic flux front penetration depth than those prepared with antivortices. The proposed strategy could be implemented to boost the performance of thin superconducting devices.

show abstract

Structure of the mixed state induced in thin YBaCuO superconducting films by the field of a small ferromagnetic particle

Cited by 6 publications

References 15 publications

Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field

Enhancing the effective critical current density in a Nb superconducting thin film by cooling in an inhomogeneous magnetic field

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