Controlled phase shifts in interlayer magnetic coupling with the doping of the magnetic layer
IPCMS, CNRS, UMR46, 23 rue du Loess, F-67037 Strasbourg, France
2 Department of Physics, Ohio State University - Columbus, Ohio 43210, USA
3 Clarendon Laboratory, University of Oxford - Parks Road, Oxford OX1 3PU, UK
Accepted: 12 June 1997
We report the first observation of a strong change in the phase (up to 360 degrees) of the interlayer magnetic exchange coupling in Co/Ru/Co and Co/Cu/Co trilayer system which is controlled by the addition of small amounts of Ag (up to 8%) to the Co layers. The phase shifts may be due to modifications of magnetic-film spin-dependent potentials which control conduction electron contributions to the interlayer coupling. In addition, a strong additive antiparallel bias to the interlayer magnetic exchange coupling in Co/Ru/Co trilayers is observed, indicating a possible additive superexchange interaction.
PACS: 75.30.Et – Exchange and superexchange interactions / 68.65.+g – Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties / 75.70.Cn – Interfacial magnetic properties (multilayers, magnetic quantum wells, superlattices, magnetic heterostructures)
© EDP Sciences, 1997