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Studies to date on ferromagnet/d-wave superconductor heterostructures focusmainly on the effects at or near the interfaces while the response of bulkproperties to heterostructuring is overlooked. Here we use resonant soft x-rayscattering spectroscopy to reveal a novel c-axis ferromagnetic coupling betweenthe in-plane Cu spins in YBa$_2$ Cu$_3$ O$_{7-x}$ (YBCO) superconductor when itis grown on top of ferromagnetic La$_{0.7}$ Ca$_{0.3}$ MnO$_3$ (LCMO) manganitelayer. This coupling, present in both normal and superconducting states ofYBCO, is sensitive to the interfacial termination such that it is only observedin bilayers with MnO_2but not with La$_{0.7}$ Ca$_{0.3}$ interfacialtermination. Such contrasting behaviors, we propose, are due to distinctenergetic of CuO chain and CuO$_2$ plane at the La$_{0.7}$ Ca$_{0.3}$ andMnO$_2$ terminated interfaces respectively, therefore influencing the transferof spin-polarized electrons from manganite to cuprate differently. Our findingssuggest that the superconducting/ferromagnetic bilayers with proper interfacialengineering can be good candidates for searching the theorizedFulde-Ferrel-Larkin-Ovchinnikov (FFLO) state in cuprates and studying thecompeting quantum orders in highly correlated electron systems.

Selective interlayer ferromagnetic coupling between the Cu spins in YBa$_2$ Cu$_3$ O$_{7-x}$ grown on top of La$_{0.7}$ Ca$_{0.3}$ MnO$_3$