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Pré-Publication, Document De Travail Année : 2011

Nanostructured exchange coupled hard / soft composites: from the local magnetization profile to an extended 3D simple model

V. Russier
K. Younsi
  • Fonction : Auteur
L. Bessais

Résumé

In nanocomposite magnetic materials the exchange coupling between phases plays a central role in the determination of the extrinsic magnetic properties of the material: coercive field, remanence magnetization. Exchange coupling is therefore of crucial importance in composite systems made of magnetically hard and soft grains or in partially crystallized media including nanosized crystallites in a soft matrix. It has been shown also to be a key point in the control of stratified hard / soft media coercive field in the research for optimized recording media. A signature of the exchange coupling due to the nanostructure is generally obtained on the magnetization curve $M(H)$ with a plateau characteristic of the domain wall compression at the hard/soft interface ending at the depinning of the wall inside the hard phase. This compression / depinning behavior is clearly evidenced through one dimensional description of the interface, which is rigorously possible only in stratified media. Starting from a local description of the hard/soft interface in a model for nanocomposite system we show that one can extend this kind of behavior for system of hard crystallites embedded in a soft matrix.

Dates et versions

hal-00651182 , version 1 (13-12-2011)

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Citer

V. Russier, K. Younsi, L. Bessais. Nanostructured exchange coupled hard / soft composites: from the local magnetization profile to an extended 3D simple model. 2011. ⟨hal-00651182⟩
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