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Magnetic structure and interlayer exchange coupling in spring magnets—studied via nuclear resonant scattering

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Torsten Klein, Ralf Röhlsberger, Ovidiu Crisan, Kai Schlage and Eberhard Burkel

Editorial: Elsevier Science, Thin Solid Films, 515 (4), p.2531-2534, 2006.


Magnetic properties of FePt/Ag/Fe and FePt/Pd/Fe layer systems, prepared by magnetron sputtering, were investigated using the nuclear resonant forward scattering of synchrotron radiation. This technique allows the accurate determination of magnetic hyperfine field orientations by using an extremely thin 57Fe probe layer suitably embedded within the soft magnetic layer. From an evaluation of these measurements within a one-dimensional micromagnetic model, the interlayer exchange coupling constants between the magnetically hard (FePt) and soft (Fe) layers were determined as function of the Ag and Pd interlayer thickness. The interlayer thickness dependence of the bilinear coupling constants provides evidence for the superposition of Ruderman–Kittel–Kasuya–Yoshida coupling and a magnetostatic interaction between the magnetic layers.

Cuvinte cheie: Exchange spring effect; Interlayer exchange coupling; Micromagnetic simulation; Nuclear resonant forward scattering