Frozen Flux Superconductors

Lyuksyutov, I. F.; Naugle, D. G.

doi:10.1142/s0217984999000622

Cited by 94 publications

(48 citation statements)

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“…The magnetic field from the SC currents interacts with magnetic subsystem [3,4]. We have proposed different realizations of mesoscopic magneto-superconducting systems: arrays of magnetic dots on the top of a superconducting film [2], magnetic/superconducting bi-layers [3], magnetic nanorods embedded into a superconductor [4].In the majority of proposed systems a magnetic texture interacts with the superconducting current. An inhomogeneous magnetization generates magnetic field outside the magnet.…”

mentioning

confidence: 99%

“…The fabrication and experimental study [1] of mesoscopic heterogeneous magnetic/superconducting systems together with recent theoretical predictions [2][3][4] open a new class of physical effects. Earlier two of us (I.F.L.…”

mentioning

confidence: 99%

“…Inhomogeneous magnetization of the magnetic texture generates magnetic field penetrating into the superconductor. The magnetic field from the SC currents interacts with magnetic subsystem [3,4]. We have proposed different realizations of mesoscopic magneto-superconducting systems: arrays of magnetic dots on the top of a superconducting film [2], magnetic/superconducting bi-layers [3], magnetic nanorods embedded into a superconductor [4].…”

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Interaction of mesoscopic magnetic textures with superconductors

et al. 2002

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We analyze magnetic textures in a thin magnetic film and screening currents induced by these textures in a superconducting film. The two films are supposed to be parallel and close each to other, but interact only via magnetic fields. We consider also vortices inside superconducting film and their interaction with magnetic textures. As examples of magnetic textures we consider magnetic dot and magnetic vortex. We derive the condition at which spontaneous formation of a vortex or a coupled vortex-magnetic defect is energetically favorable. It is proven that the normal component of magnetic field generated by a magnetic dot changes sign in the presence of the superconducting vortex.74.60. Ge, 74.25.Ha, 74.25.Dw The fabrication and experimental study [1] of mesoscopic heterogeneous magnetic/superconducting systems together with recent theoretical predictions [2][3][4] open a new class of physical effects. Earlier two of us (I.F.L. and V.L.P.) proposed to separate superconductivity and magnetism in space employing the modern technique of nanofabrication [2]. The proximity effect which suppresses both order parameters can be easily avoided by growing insulator oxide layers between ferromagnetic (FM) and superconducting (SC) components. Inhomogeneous magnetization of the magnetic texture generates magnetic field penetrating into the superconductor. The magnetic field from the SC currents interacts with magnetic subsystem [3,4]. We have proposed different realizations of mesoscopic magneto-superconducting systems: arrays of magnetic dots on the top of a superconducting film [2], magnetic/superconducting bi-layers [3], magnetic nanorods embedded into a superconductor [4].In the majority of proposed systems a magnetic texture interacts with the superconducting current. An inhomogeneous magnetization generates magnetic field outside the magnet. The magnetic field generates screening currents in superconductors which, in turn, change the magnetic field. The problem must be solved self-consistently . In this article we develop a general formalism for interacting inhomogeneous magnetization (texture) and superconductors in the London's approximation. Employing this formalism, we find two elementary solutions for a circular magnetic dot on the top of a superconducting film, magnetized perpendicularly to it, and for a coupled magnetic and superconducting vortices. London's approximation works satisfactory since the sizes of all structures in the problem exceeds remarkably the coherence length ξ.Recent theoretical works [5][6][7] consider problems close to ours. The main difference between our work and the Ref.[6] is that they do not incorporate spontaneous vortices in the ground state. In comparison to the Refs. [5,7] our approach is more general and universal. A more detailed comparison with these references will be given later.So far only arrays of sub-micron size magnetic dots covered by thin superconducting films have been prepared and studied experimentally [1] * * . The effect of commencuracy on the transport properti...

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Interaction of mesoscopic magnetic textures with superconductors

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“…18 For magnetic particles with characteristic length L where < L < , strong interaction between flux line network and magnetic system can be expected. 19 Hence, the addition of magnetic nanoparticles within this size range can be used to increase the transport critical current density of superconductors.…”

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Effect of nano-sized Co3O4 addition on the transport properties of YBa2Cu3O7−δ

Abd‐Shukor¹,

Nazrin

Aisyah

et al. 2014

AIP Conference Proceedings

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Abstract. The effect of nano-sized Co 3 O 4 (10 -30 nm) addition on YBa 2 Cu 3 O 7-(Co 3 O 4 ) x with x = 0 to 0.12 wt.% has been investigated by powder X-ray diffraction method, dc electrical resistance measurements and scanning electron microscopy. The Co 3 O 4 particle size was larger than the coherence length but smaller than the penetration depth of the YBa 2 Cu 3 O 7-superconductor. The onset transition temperature (T c onset ) showed no significant changes for low Co 3 O 4 addition (x 0.02 wt. %) and then decreased monotonically with the increase in Co 3 O 4 content indicating a pair-breaking like mechanism in T c suppression for x = 0.03 to 0.12 wt. %. A sudden broadening of the superconducting-transitionwidth for x 0.11 wt. % was also observed. The transport properties were measured and related to the microstructure. Scanning electron micrographs showed homogeneous distribution of Co 3 O 4 throughout the samples and the distance between particles was smaller than 1 μm but larger than the typical Abrikosov vortex lattice constant.

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“…The coherence length ξ of (Bi, Pb)-2223 system is 2.9 nm and the penetration depth λ is 60 -1000 nm. It is expected that the interaction between flux line and the nanoparticles will be strong for a particle with size L where ξ < L < λ [9].…”

Section: Introductionmentioning

confidence: 99%

Effect of nanosized PbO on the electrical transport properties of (Bi1.6Pb0.4)Sr2Ca2Cu3O10 superconductor

Yahya

Abd‐Shukor²

2013

AIP Conference Proceedings

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Abstract. The effect of nanosized PbO additions on the superconducting properties of (Bi, Pb)-2223(PbO)x (x = 0 -0.15 wt. %) prepared by the co-precipitation method was studied. The structure and the microstructure of samples were examined by powder XRD and SEM, respectively. The transport critical current density (J c ), onset transition temperature (T c onset ) and zero resistance temperature (T c zero ) were determined by using four-probe method. It was observed that PbO additions enhanced J c for all added samples. The x = 0.05 wt. % sample showed the highest J c (19.3 and 11.3 A/cm 2 at 30 and 77 K, respectively) This study showed that the addition of PbO, as a result of existence of the effective artificial pinning, provided extra flux pinning centers in the (Bi, Pb)-2223 superconductor.

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Frozen Flux Superconductors

Cited by 94 publications

References 13 publications

Interaction of mesoscopic magnetic textures with superconductors

Interaction of mesoscopic magnetic textures with superconductors

Effect of nano-sized Co3O4 addition on the transport properties of YBa2Cu3O7−δ

Effect of nanosized PbO on the electrical transport properties of (Bi1.6Pb0.4)Sr2Ca2Cu3O10 superconductor

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