Ferromagnet (FM)/antiferromagnet (AF) exchange bias, heretofore consid
ered due to nearest-neighbor exchange coupling at the FM/AF interface,
has been found to be long range. Using trilayers of FM/spacer/AF with
Ag, Au, and Cu as spacer layer materials, the strength of the observe
d exchange coupling decays exponentially and extends to as much as 50
Angstrom.