Remagnetization processes of ultrathin magnetic films with "islands" structure

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Lyakhimets, S. | Maziewski, A. | Stefanowicz, E. | Tarasenko, V.V. | Ferré, J. | Grolier, V. | Renard, D.

Edité par CCSD ; American Institute of Physics -

International audience. Magnetization delay recently observed in ultrathin ferromagnetic films has been discussed using the Fatuzzo theory assuming homogeneous magnet. However, the islands structure of ultrathin films is observed for small sample thicknesses. The "islands" model of magnet structure is proposed in the present work for the delay description. It is assumed that the sample is broken at magnetic clusters created by magnetic islands connected by magnetic "bridges" and remagnetization of each cluster undergoes independently. Function describing sample remagnetization is obtained as a sum Ψ(t)=pΨ∞(t)+(1-p)<Ψ(t)≳, where p is the concentration of infinite clusters; Ψ∞(t) is the function from the Fatuzzo theory, and <Ψ(t)≳ is the remagnetization function averaged for a different number of islands in finite clusters. The presented model could be used for analysis of magnetization processes in other magnets consisting of magnetically interacting "islands.".

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