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We performed scanning tunneling spectroscopy of c-axis oriented YBCO films ontop of which ferromagnetic SRO islands were grown epitaxially in-situ. Whenmeasured on the ferromagnetic islands, the density of states exhibits smallgap-like features consistent with the expected short range penetration of theorder parameter into the ferromagnet. However, anomalous split-gap structuresare measured on the superconductor in the vicinity of ferromagnetic islands.This observation may provide evidence for the recently predicted inducedmagnetization in the superconductor side of a superconductor/ ferromagnetjunction. The length scale of the effect inside the superconductor was found tobe an order of magnitude larger than the superconducting coherence length. Thisis inconsistent with the theoretical prediction of a penetration depth of onlya few superconducting coherence lengths. We discuss a possible origin for thisdiscrepancy.

Evidence for Induced Magnetization in Superconductor-Ferromagnet Hetero-structures: a Scanning Tunnelling Spectroscopy Study