Developments of the Theory of Spin Susceptibility in Metals

W. Baltensperger

Centro Brasileiro de Pesquisas Físicas, CBPF
Rua Dr. Xavier Sigaud 150 22290-970, Rio de Janeiro, RJ, Brazil

Received May 6, 1997

Abstract

The calculation of spin susceptibilities in metals, in particular the Ruderman-Kittel-Kasuya-Yosida (RKKY) polarization due to a point coupling, is reviewed. In the one dimensional case, the low coupling limit of the non-linear theory clarifies traditional perturbation approaches. Multilayer structures require theories with bounded metals. An explicit formula is derived for the indirect interaction between two ferromagnetic plates in a half space. A case, where an oscillatory amplitude decays with the first power of the distance to the boundary is discussed.

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