Abstract
Quantum well states are observed around the “neck” of the Fermi surface in Cu films grown on magnetic fcc Co(100) substrates, using high-resolution angle-resolved photoemission. The observation is only possible with an abrupt, nonreacted Cu/Co interface, which is produced by low temperature deposition of the first Cu layer. The analysis of the spectra gives a periodic crossing of the Fermi level of atomic layers, the same short magnetic coupling period obtained in Co/Cu/Co trilayers, and also the same value predicted by the theory. This is a strong confirmation of the role of quantum well states as mediators of magnetic coupling in superlattices.
- Received 1 July 1996
DOI:https://doi.org/10.1103/PhysRevLett.77.3455
©1996 American Physical Society