Abstract
We calculate the RKKY coupling between two magnetic layers separated by a nonmagnetic spacer, with scattering potentials added to represent changes in environment between the layers. For the case of a spacer potential well of depth V, the usual π/k F oscillation period is superseded by one much longer, πħ/√2mV. For a deep potential well (V∼¬∈ F ), the RKKY interaction becomes purely ferromagnetic for spacings greater than a few angstroms. Scattering potentials localized at the interfaces produce a phase shift in the RKKY oscillations. We discuss evidence for these effects in experimental systems
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