  Scanning tunneling spectroscopy measurements on thin epitaxial
SrRuO3/(100)YBCO ferromagnet/superconductor bilayers, reveal localized regions
in which the superconductor order parameter penetrates the ferromagnet to more
than 26 nm, an order of magnitude larger than the coherence length in the
ferromagnetic layer. These regions consist of narrow (< 10 nm) and long strips,
separated by at least 200 nm, consistent with the known magnetic domain wall
structure in SrRuO3. We attributed this behavior to Crossed Andreev
Reflections, taking place in the vicinity of the magnetic domain walls.

Superconductivity