In the past year, several groups have observed evidence for long-range spin-triplet, supercurrent in Josephson junctions containing ferromagnetic (F) materials. In our work, the spin-triplet pair correlations are created by non-collinear magnetizations between a central Co/Ru/Co "synthetic antiferromagnet" (SAF) and two outer think F layers. Here we present data showing that the spin-triplet supercurrent is enhanced up to 20 times after our samples are subject to a large in-plane magnetizing field. This surprising result can be explained if the Co/Ru/Co SAF undergones a "spin-flop" transition, whereby the two Co layer magnetizations end up perpendicular to the magnetizations of the two think F layers. Direct experimental evidence for the spin-flop transition comes from scanning electron microscopy with polarization analysis and from spin-polorized neutron reflectometry.
Citation: Physical Review Letters
Pub Type: Journals
Josephson Junction, Supercurrent Effect, Spin-flop transition, Polarized neutron reflectivity, SEMPA