  Josephson junctions containing multiple ferromagnetic layers can carry
spin-triplet supercurrent under certain conditions. Large-area junctions
containing multiple domains are expected to have a random distribution of 0 or
pi coupling across the junction surface, whereas magnetized samples should have
uniquely pi coupling everywhere. We have measured the area dependence of the
critical current in such junctions, and confirm that the critical current
scales linearly with area in magnetized junctions. For as-grown (multi-domain)
samples, the results are mixed. Samples grown on a thick Nb base exhibit
critical currents that scale sub-linearly with area, while samples grown on a
smoother Nb/Al multilayer base exhibit critical currents that scale linearly
with area. The latter results are consistent with a theoretical picture due to
Zyuzin and Spivak that predicts that the as-grown samples should have global
pi/2 coupling.
