First principles studies of modulated Co/Cu superlattices with strongly and weakly exchange biased Co-monolayers

S. Krompiewski; F. Süss; U. Krey

doi:10.1016/S0304-8853(96)00646-4

paper

First principles studies of modulated Co/Cu superlattices with strongly and weakly exchange biased Co-monolayers

arXiv:cond-mat/9603080 · doi:10.1016/S0304-8853(96)00646-4

Abstract

First-principles calculations have been performed in order to determine effective exchange integrals between {\it strongly} and {\it weakly} exchange-coupled Co monolayers in certain modulated periodic $C o C u_{2} / C o C u_{n}$ -type superlattices with three non-equivalent Co planes, which have not yet been studied hitherto. For $3 \leq n \leq 6$ we find that the two non-equivalent exchange integrals have opposite signs, i.e.~the strong coupling is antiferromagnetic and the weak coupling ferromagnetic, and differ for $n \neq = 4$ from each other by one order of magnitude. It is shown that the results depend on the system as a whole and could not be obtained from separate parts. Finally we suggest that ''spin valve'' systems of such kind should be considered when trying to obtain good magneto-resistance together with low switching-fields.

arXiv commentLaTex, 9 pages, including two .eps-figures

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Oscillatory Thickness Dependence of Magnetic Moments and interface-induced Changes of the Exchange Coupling in Co/Cu and Co-Ni/Cu Multilayers

First principles studies of modulated Co/Cu superlattices with strongly and weakly exchange biased Co-monolayers

Abstract

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