  The superconducting equivalent of giant magnetoresistance, involves placing a
thin-film superconductor between two ferromagnetic layers. A change of
magnetization-alignment in such a superconducting spin-valve from parallel (P)
to antiparallel (AP) creates a positive shift in the superconducting transition
temperature ({\Delta}Tc) due to an interplay of the magnetic exchange energy
and the superconducting condensate. The magnitude of {\Delta}Tc scales
inversely with the superconductor thickness (dS) and is zero when dS exceeds
the superconducting coherence length ({\xi}) as predicted by de Gennes. Here,
we report a superconducting spin-valve effect involving a different underlying
mechanism that goes beyond de Gennes in which magnetization-alignment and
{\Delta}Tc are determined by the nodal quasiparticle-excitation states on the
Fermi surface of the d-wave superconductor YBa2Cu3O7-{\delta} (YBCO) grown
between insulating layers of ferromagnetic Pr0.8Ca0.2MnO3. We observe
{\Delta}Tc values that approach 2 K with {\Delta}Tc oscillating with dS over a
length scale exceeding 100 {\xi} and, for particular values of dS, we find that
the superconducting state reinforces an antiparallel magnetization-alignment.
These results pave the way for all-oxide superconducting memory in which
superconductivity modulates the magnetic state.
