  The transport properties between ferromagnets and high-Tc superconductors are
investigated in La0.67Sr0.33MnO3/YBa2Cu3O7-d (LSMO/YBCO)junctions in the
geometry of cross-strip lines. The conductance spectra show zero-bias
conductance peaks (ZBCP), reflecting the charge transport in the ab-plane. When
an external magnetic field is applied to the junctions, the conductance spectra
show two notable features, i.e., an increase of background conductance and an
asymmetric ZBCP splitting whose amplitude responds nonlinearly to the applied
field. It is shown that the magnetic field response are consistent with a
theoretical prediction of tunneling spectroscopy when the presence of a
ferromagnetic barrier between a spin-polarized ferromagnet and a d-wave
superconductor is assumed.
