Tuning vortex confinement by magnetic domains in a superconductor/ferromagnet bilayer
Marta Z. Cieplak, Z. Adamus, M. Kończykowski, L. Y. Zhu, X. M. Cheng, C. L. Chien
DOI 10.1103/PhysRevB.87.014519 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We use a line of miniature Hall sensors to study the effect of magnetic-domain-induced vortex confinement on the flux dynamics in a superconductor/ferromagnet bilayer. A single tunable bilayer is built of a ferromagnetic Co/Pt multilayer with perpendicular magnetic anisotropy and a superconducting Nb layer, with the insulating layer in-between to avoid the proximity effect. The magnetic-domain patterns of various geometries are reversibly predefined in the Co/Pt multilayer using the appropriate magnetization procedure. The magnetic-domain geometry strongly affects vortex dynamics, leading to geometry-dependent trapping of vortices at the sample edge, nonuniform flux penetration, and strongly nonuniform critical current density. With the decreasing temperature, the magnetic pinning increases, but this increase is substantially weaker than that of the intrinsic pinning. The analysis of the initial flux penetration suggests that vortices may form various vortex structures, including disordered Abrikosov lattice or single and double vortex chains, in which minimal vortex-vortex distance is comparable to the magnetic penetration depth.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.73 | Pressure not reported | unknown |
Similar papers
Influence of magnetic domain landscape on the flux dynamics in superconductor/ferromagnet bilayers
similarity 0.97Z. Adamus et al.
Source status unknown — claims are unverified
Enhanced superconducting vortex pinning with disordered nanomagnetic arrays
similarity 0.96Y. J. Rosen et al.
Source status unknown — claims are unverified
Magnetic coupling in superconducting spin valves with strong ferromagnets
similarity 0.96M. Flokstra et al.
Source status unknown — claims are unverified
Unanticipated Proximity Behavior in Ferromagnet-Superconductor Heterostructures with Controlled Magnetic Noncollinearity
similarity 0.96L. Y. Zhu et al.
Source status unknown — claims are unverified
Magnetization Dynamics in Proximity-Coupled Superconductor-Ferromagnet-Superconductor Multilayers
similarity 0.96I.A. Golovchanskiy et al.
Source status unknown — claims are unverified
Altering the Superconductor Transition Temperature by Domain-Wall Arrangements in Hybrid Ferromagnet-Superconductor Structures
similarity 0.96L. Y. Zhu et al.
Source status unknown — claims are unverified