Non-collinear Exchange Coupling in Trilayer Magnetic Junction and its Connection to Fermi Surface Topology

Details Non-collinear Exchange Coupling in Trilayer Magnetic Junction and its Connection to Fermi Surface Topology Non-collinear Exchange Coupling in Trilayer Magnetic Junction and its Connection to Fermi Surface Topology

2006-07-07

arxiv.org/abs/cond-mat/0607203v1

Phys. Rev. B 73, 241307(R) (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures, final version to appear in PRB Rapid Communication

Scientific paper

10.1103/PhysRevB.73.241307

We investigate the non-collinear exchange coupling across the trilayer magnetic junction composed of an intermediate layer with Rashba interaction and two sandwiching ferromagnetic ones. To compute the mediated exchange coupling, one needs to go beyond the single-particle argument and integrate over the contributions from the whole Fermi surface. Surprisingly, we find that the topology of the Fermi surface plays a crucial role in determining whether the oscillatory RKKY or the spiral interactions would dominate. At the end, we discuss the connection of our numerical results to experiments and potential applications.

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