Tunable phase diagram and vortex pinning in a superconductor-ferromagnet bilayer

Details Tunable phase diagram and vortex pinning in a superconductor-ferromagnet bilayer Tunable phase diagram and vortex pinning in a superconductor-ferromagnet bilayer

2010-07-13

arxiv.org/abs/1007.2179v1

Phys. Rev. B 82, 060503(R) (2010)

Physics

Condensed Matter

Superconductivity

17 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.060503

We have observed the evolution of phase diagram and vortex pinning using a single ferromagnet/superconductor bilayer of [Co/Pt]8/Nb through a special demagnetization procedure. It induces a continuous and reversible change of the domain width with equal positive/negative domains enabling the observation of the predicted tunable phase diagram. The tunable domain pattern also systematically affects vortex pinning. We have determined the dependence of the activation energy of vortex pinning on domain width, temperature, and magnetic field.

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