Superfluid density of superconductor-ferromagnet bilayers

Details Superfluid density of superconductor-ferromagnet bilayers Superfluid density of superconductor-ferromagnet bilayers

2007-10-17

arxiv.org/abs/0710.3376v1

Physics

Condensed Matter

Superconductivity

13 pages, 2 figures, MMM 2007 proceedings

Scientific paper

10.1063/1.2832318

We report the first measurements of the effective superfluid density n_S(T) \propto \lambda^{-2}(T) of Superconductor-Ferromagnet (SC/FM) bilayers, where \lambda is the effective magnetic field penetration depth. Thin Nb/Ni bilayers were sputtered in ultrahigh vacuum in quick succession onto oxidized Si substrates. Nb layers are 102 A thick for all samples, while Ni thicknesses vary from 0 to 100 A. T_C determined from \lambda^{-2}(T) decreases rapidly as Ni thickness d_Ni increases from zero to 15 A, then it has a shallow minimum at d_Ni \approx 25 A. \lambda^{-2}(0) behaves similarly, but has a minimum several times deeper. In fact, \lambda^{-2}(0) continues to increase with increasing Ni thickness long after T_C has stopped changing. We argue that this indicates a substantial superfluid density inside the ferromagnetic Ni films.

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