Origin of biquadratic exchange in Fe/Si/Fe

G.J. Strijkers, J.T. Kohlhepp, H.J.M. Swagten, W.J.M. Jonge, de

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The thickness and temperature dependences of the interlayer exchange coupling in well-defined molecular beam epitaxy-grown Fe/Si/Fe sandwich structures have been studied. The biquadratic coupling shows a strong temperature dependence in contrast to the bilinear coupling. Both depend exponentially on thickness. These observations can be well understood in the framework of Slonczewski's loose spins model [J. Appl. Phys. 73, 5957 (1993)]. No bilinear contribution of the loose spins to the coupling was observed.
Original languageEnglish
Pages (from-to)1812-1815
Number of pages4
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 2000


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