First-principles asymptotics for the oscillatory exchange coupling in of (100), (110), and (111) orientations

N. Lathiotakis, B. Györffy, B. Újfalussy

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Abstract

We developed a theory of the oscillatory magnetic coupling across nonmagnetic, ordered or disordered layers and illustrate its use by explicit calculations for Co/Cu/Co trilayers of (100), (110), and (111) orientations. Our approach to the problem is based on the layered, screened Korringa-Kohn-Rostoker (KKR) and KKR-coherent-potential approximation electronic structure methods and employs a saddle-point approximation for calculating the coupling energy for asymptotically large spacer thicknesses D. The results of the asymptotic analysis are tested against full calculations, and other important issues concerning the general validity of the approach are examined. Our results for the oscillation periods as well as the amplitudes and phases are in good agreement with experiments and other calculations.

Original languageEnglish
Pages (from-to)6854-6865
Number of pages12
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number10
DOIs
Publication statusPublished - Jan 1 2000

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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