  In 2010, several experimental groups obtained compelling evidence for
spin-triplet supercurrent in Josephson junctions containing strong
ferromagnetic materials. Our own best results were obtained from large-area
junctions containing a thick central Co/Ru/Co "synthetic antiferromagnet" and
two thin outer layers made of Ni or PdNi alloy. Because the ferromagnetic
layers in our samples are multi-domain, one would expect the sign of the local
current-phase relation inside the junctions to vary randomly as a function of
lateral position. Here we report measurements of the area dependence of the
critical current in several samples, where we find some evidence for those
random sign variations. When the samples are magnetized, however, the critical
current becomes clearly proportional to the area, indicating that the
current-phase relation has the same sign across the entire area of the
junctions.
