Abstract
The transport properties of a ferromagnet-superconductor (FS) junction are studied in a scattering formulation. Andreev reflection at the FS interface is strongly affected by the exchange interaction in the ferromagnet. The conductance of a ballistic point contact between F and S can be either larger or smaller than the value with the superconductor in the normal state, depending on the ratio of the exchange and Fermi energies. If the ferromagnet contains a tunnel barrier (I), the conductance exhibits resonances which do not vanish in linear response—in contrast to the Tomasch oscillations for nonferromagnetic materials.
- Received 12 September 1994
DOI:https://doi.org/10.1103/PhysRevLett.74.1657
©1995 American Physical Society