Oscillatory behavior of the magnetic anisotropy energy in multilayer systems

L. Szunyogh, B. Újfalussy, C. Blaas, U. Pustogowa, C. Sommers, P. Weinberger

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43 Citations (Scopus)

Abstract

The oscillatory behavior of the magnetic-anisotropy energy in different types of (Formula presented) multilayers on a Cu(100) substrate, including free surfaces, capped surfaces, and Co/Cu spacer systems, is shown in terms of ab initio-like calculations using the self-consistent fully relativistic spin-polarized screened Korringa-Kohn-Rostoker method. Deduced from direct representations and discrete (linear) Fourier transformations with respect to the number of Co layers, a period of two monolayers seems to be characteristic for these oscillations, whereas for a given number of Co layers and viewed with respect to the number of Cu-spacer layers they rapidly approach the value of the magnetic anisotropy energy for the corresponding (Formula presented) multilayer on Cu(100) with a semi-infinite Cu cap, the so-called biased value. By excluding the so-called preasymptotic regime a short and a long period of 2.5 and 5.5 monolayers, respectively, can be traced for the oscillations with respect to the number of Cu-spacer layers. All types of oscillations, namely, either with respect to the number of Co layers or with respect to the number of Cu-spacer layers, are analyzed in terms of layer-resolved band-energy contributions to the magnetic-anisotropy energy. Such a layerwise distribution of the magnetic-anisotropy energy allows one not only to characterize different regimes of thicknesses, but also to discuss the effect of the actual interface on the absolute values of the magnetic-anisotropy energy, shown in particular by considering a system with Co/Au interfaces.

Original languageEnglish
Pages (from-to)14036-14044
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume56
Issue number21
DOIs
Publication statusPublished - Jan 1 1997

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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