Enhancement of vortex pinning in superconductor/ferromagnet bilayers via angled demagnetization

Details Enhancement of vortex pinning in superconductor/ferromagnet bilayers via angled demagnetization Enhancement of vortex pinning in superconductor/ferromagnet bilayers via angled demagnetization

2011-07-19

arxiv.org/abs/1107.3743v1

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, accepted to Phys. Rev. B, Rapid Communications

Scientific paper

We use local and global magnetometry measurements to study the influence of magnetic domain width w on the domain-induced vortex pinning in superconducting/ferromagnetic bilayers, built of a Nb film and a ferromagnetic Co/Pt multilayer with perpendicular magnetic anisotropy, with an insulating layer to eliminate proximity effect. The quasi-periodic domain patterns with different and systematically adjustable width w, as acquired by a special demagnetization procedure, exert tunable vortex pinning on a superconducting layer. The largest enhancement of vortex pinning, by a factor of more than 10, occurs when w ~ 310 nm is close to the magnetic penetration depth.

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