The London Study of Vortex States in a Superconducting Film Due to a Magnetic Dot

Abstract

Here we report a study of vortex states in a thin superconducting film with a magnetic dot grown upon it by means of a method based on London-Maxwell equations. Vortices with single quantum flux (${\Phi }_0=hc/2e$), giant vortices (vortices with multiple flux) as well as antivortices (vortices with negative vorticity) are taken into consideration. It turns out that giant vortices occur, when the dot's size is sufficiently smaller ($R\le 4.5\xi$) than the effective penetration depth $\Lambda$. In the case of a dot with sufficiently large size ($R\ge 6\xi$), the vortices with single quantum flux dominate the vortex states. Their geometrical patterns are predicted up to seven vortices. Our calculations do not show the spontaneous appearance of antivortices.

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References in corpus (6)

• Ferromagnet-Superconductor Hybrids
• Experimental Evidence for Giant Vortex States in a Mesoscopic Superconducting Disk
• Vortex States of a Superconducting Film from a Magnetic Dot Array
• Anisotropic Transport Properties of Ferromagnetic-Superconducting Bilayers
• Superconducting Transition Temperature in Heterogeneous Ferromagnet-Superconductor Systems
• Vortex Penetration in Magneto-Superconducting Heterostructures

Cited by in corpus (4)

• Nucleation of superconductivity and vortex matter in superconductor - ferromagnet hybrids
• Vorticity and magnetic shielding in a type-II superconductor
• Magnetic dipole-vortex interaction in a bilayer superconductor/soft-magnet heterostructure
• Stable "antiferromagnetic" vortex lattice imprinted into a type-II superconductor