Abstract
The superconducting transition temperature in Nb/Gd multilayers shows a pronounced nonmonotonic dependence on the ferromagnetic Gd layer thickness for fixed Nb thickness . For Å, the oscillation occurs in the range Å where the Gd ferromagnetism is well established. These results provide the first evidence for the predicted phase in superconductor/ferromagnet multilayers where the order parameter in neighboring superconducting layers may have an intrinsic phase difference.
- Received 6 May 1994
DOI:https://doi.org/10.1103/PhysRevLett.74.314
©1995 American Physical Society