Spatial trends of non-collinear exchange coupling mediated by itinerant carriers with different Fermi surfaces

Details Spatial trends of non-collinear exchange coupling mediated by itinerant carriers with different Fermi surfaces Spatial trends of non-collinear exchange coupling mediated by itinerant carriers with different Fermi surfaces

2009-01-28

arxiv.org/abs/0901.4577v1

Phys. Rev. B 79, 045315 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures

Scientific paper

10.1103/PhysRevB.79.045315

We study the exchange coupling mediated by itinerant carriers with spin-orbit interaction by both analytic and numeric approaches. The mediated exchange coupling is non-collinear and its spatial trends depend on the Fermi surface topology of the itinerant carriers. Taking Rashba interaction as an example, the exchange coupling is similar to the conventional Ruderman-Kittel-Kasuya-Yosida type in weak coupling. On the other hand, in the strong coupling, the spiral interaction dominates. In addition, inclusion of finite spin relaxation always makes the non-collinear spiral exchange interaction dominant. Potential applications of our findings are explained and discussed.

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