Exponential behavior of the interlayer exchange coupling across non-magnetic metallic superlattices

Details Exponential behavior of the interlayer exchange coupling across non-magnetic metallic superlattices Exponential behavior of the interlayer exchange coupling across non-magnetic metallic superlattices

1998-07-13

arxiv.org/abs/cond-mat/9807182v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.58.8198

It is shown that the coupling between magnetic layers separated by non-magnetic metallic superlattices can decay exponentially as a function of the spacer thickness $N$, as opposed to the usual $N^{-2}$ decay. This effect is due to the lack of constructive contributions to the coupling from extended states across the spacer. The exponential behavior is obtained by properly choosing the distinct metals and the superlattice unit cell composition.

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