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NCUEIR > College of Science > Department of Physics > Periodical Articles > Item 987654321/15336

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/15336

Title:	Magnetic Force Acting on a Magnetic Dipole Over a Superconducting Thin Film
Authors:	Wei, J. C.;Chen, J. L.;Horng, Lance;Yang, T. J.
Contributors:	物理學系
Date:	1996-12
Issue Date:	2013-02-05T02:17:33Z
Publisher:	The American Physical Society
Abstract:	The magnetostatic interaction energy and corresponding magnetic force acting on a magnetic point dipole placed above a type-II thin superconducting film in the mixed state with a single vortex are calculated using electromagnetics coupled with the London theory of superconductivity. If a vortex is trapped by a circular defect of radius b≪Λ, the magnetic forces, caused by the vortex, differ from the results of free from defect pinning by the factor (1-b/Λ), where Λ is the effective penetration depth. The possibility of formation of the vortex in the thin film only in the field of the magnetic point dipole is investigated. The critical position of the dipole for creating the first vortex under the electromagnetic pinning of a circular defect and that position in the absence of defect pinning are obtained for comparison. In particular, in the limit of a/Λ≫1, where a is the separation between the dipole and the thin film, the only difference between two results is in the cutoff length, i.e., in the case of a circular defect the only difference in the critical position calculation is the cutoff at radius b rather than at coherence length ξ. The pinning force of a single vortex by a circular defect is also calculated. Further, we investigate the conditions of the vortex creation for various cases (including the first, second, and third vortices) for a free of pinning center in the examining region. It is found that the creation of a new single vortex in the thin film causes an abrupt change in vertical levitation force: the force changed discontinuously.
Relation:	Phys. Rev. B, 54(21): 15429-15437
Appears in Collections:	[Department of Physics] Periodical Articles

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