Non-RKKY oscillations of exchange coupling in magnetic multilayers

TL;DR

This paper reveals that exchange coupling in magnetic multilayers can oscillate with periods not predicted by traditional RKKY theory, especially in FCC(110) structures with Cu-like Fermi surfaces.

Contribution

It demonstrates the existence of non-RKKY oscillations in exchange coupling, expanding understanding beyond classical RKKY predictions in specific crystal structures.

Findings

Exchange coupling contains oscillations not explained by RKKY theory.

Non-RKKY oscillations are significant in FCC(110) structures with Cu-like Fermi surfaces.

The study provides detailed analysis of these unconventional oscillations.

Abstract

It is shown how the exchange coupling between two ferromagnetic planes embedded in an infinite non-magnetic metal, regarded as a function of the distance between the planes, may contain important components which oscillate with periods not predicted by RKKY theory. The interesting case of a FCC(110) structure with a Cu-like Fermi surface is discussed in detail.