Exponential dependence of the interlayer exchange coupling on the spacer thickness in MBE-grown Fe/SiFe/Fe sandwiches

J.J. de Vries, J.T. Kohlhepp, F.J.A. Broeder, den, R. Coehoorn, R. Jungblut, A. Reinders, W.J.M. Jonge, de

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Abstract

The structure and interlayer exchange coupling in MBE-grown Fe/SiFe/Fe has been investigated. From structural analysis with LEED and from magnetic analysis with the magneto-optical Kerr effect, it is concluded that the Si spacer transforms into an ordered Si0.5Fe0.5 alloy. A strong antiferromagnetic coupling is found (maximum -2.0mJ/m2), the strength of which varies exponentially as a function of the spacer thickness. This behavior can be explained within the framework of recent coupling theories.
Original languageEnglish
Pages (from-to)3023-3026
JournalPhysical Review Letters
Volume78
Issue number15
DOIs
Publication statusPublished - 1997

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