Flux pinning by regular arrays of ferromagnetic dots
arXiv:cond-mat/9911033 · doi:10.1016/S0921-4534(99)00637-1
Abstract
The pinning of flux lines by two different types of regular arrays of submicron magnetic dots is studied in superconducting Pb films; rectangular Co dots with in-plane magnetization are used as pinning centers to investigate the influence of the magnetic stray field of the dots on the pinning phenomena, whereas multilayered Co/Pt dots with out-of-plane magnetization are used to study the magnetic interaction between the flux lines and the magnetic moment of the dots. For both types of pinning arrays, matching anomalies are observed in the magnetization curves versus perpendicular applied field at integer and rational multiples of the first matching field, which correspond to stable flux configurations in the artificially created pinning potential. By varying the magnetic domain structure of the Co dots with in-plane magnetization, a clear influence of the stray field of the dots on the pinning efficiency is found. For the Co/Pt dots with out-of-plane magnetization, a pronounced field asymmetry is observed in the magnetization curves when the dots are magnetized in a perpendicular field prior to the measurement. This asymmetry can be attributed to the interaction of the out-of-plane magnetic moment of the Co/Pt dots with the local field of the flux lines and indicates that flux pinning is stronger when the magnetic moment of the dot and the field of the flux line have the same polarity.
7 pages including figures; submitted for publication in Physica C (Proceedings ESF-Vortex Conference, 18-24 Sept. 1999, Crete, Greece)
References in corpus (3)
Cited by in corpus (26)
- Nanoengineered magnetic-field-induced superconductivity
- Nucleation of superconductivity and vortex matter in superconductor - ferromagnet hybrids
- Magnetic Pinning of Vortices in a Superconducting Film: The (anti)vortex-magnetic dipole interaction energy in the London approximation
- The interaction between a superconducting vortex and an out-of-plane magnetized ferromagnetic disk: influence of the magnet geometry
- Hysteresis and Fractional Matching in Thin Nb Films with Rectangular Arrays of Nanoscaled Magnetic Dots
- Vortex structure of thin mesoscopic disks in the presence of an inhomogeneous magnetic field
- Perspective: Challenges and Transformative Opportunities in Superconductor Vortex Physics
- Enhanced pinning and proliferation of matching effects in a superconducting film with a Penrose array of magnetic dots
- Vortex-antivortex dynamics and field-polarity-dependent flux creep in hybrid superconductor/ferromagnet nanostructures
- Vortex States of a Superconducting Film from a Magnetic Dot Array
- Phase diagram of a superconductor / ferromagnet bilayer
- Vortex lattice in presence of a tunable periodic pinning potential
- Asymmetric flux pinning in laterally nanostructured ferromagnetic / superconducting bilayers
- Vortex configurations and dynamics in elliptical pinning sites for high matching fields
- Little-Parks effect in a superconducting loop with magnetic dot
- Superconducting Transition Temperature in Heterogeneous Ferromagnet-Superconductor Systems
- Influence of the stray field of magnetic dot on the nucleation of superconductivity in a disk
- Symmetry Violation in a Superconducting Film with a Square Array of Ferromagnetic Dots
- The London Study of Vortex States in a Superconducting Film Due to a Magnetic Dot
- Vortex Penetration in Magneto-Superconducting Heterostructures
- Vortex configurations and metastability in mesoscopic superconductors
- Vortex states in 2D superconductor at high magnetic field in a periodic pinning potential
- Multi-vortex states of a thin superconducting disk in a step-like external magnetic field
- Vortex-Antivortex Lattices in Superconducting Films with Magnetic Pinning Arrays
- Vortex kinks in superconducting films with periodically modulated thickness
- Nanostructured superconductor/ferromagnet bilayers