  Superconductor-ferromagnet tunnel junctions demonstrate giant thermoelectric
effects which are being exploited to engineer ultra-sensitive terahertz
radiation detectors. Here, we experimentally observe the recently predicted
complete magnetic control over thermoelectric effects in a superconducting spin
valve, including the dependence of its sign on the magnetic state of the spin
valve. The description of the experimental results is improved by the
introduction of an interfacial domain wall in the spin filter layer interfacing
the superconductor. Surprisingly, the application of high in-plane magnetic
fields induces a double sign inversion of the thermoelectric effect, which
exhibits large values even at applied fields twice the superconducting critical
field.
