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In 2010, several experimental groups obtained compelling evidence forspin-triplet supercurrent in Josephson junctions containing strongferromagnetic materials. Our own best results were obtained from large-areajunctions containing a thick central Co/Ru/Co "synthetic antiferromagnet" andtwo thin outer layers made of Ni or PdNi alloy. Because the ferromagneticlayers in our samples are multi-domain, one would expect the sign of the localcurrent-phase relation inside the junctions to vary randomly as a function oflateral position. Here we report measurements of the area dependence of thecritical current in several samples, where we find some evidence for thoserandom sign variations. When the samples are magnetized, however, the criticalcurrent becomes clearly proportional to the area, indicating that thecurrent-phase relation has the same sign across the entire area of thejunctions.

Area-dependence of spin-triplet supercurrent in ferromagnetic Josephson junctions