Etude des propriétés magnétiques de multicouches Fe/Dy par simulations numériques Monte Carlo

Abstract : Fe/Dy multilayers exhibit interesting magnetic properties depending on the interface nature (roughness and interface diffusion). In particular, they may exhibit a perpendicular magnetic anisotropy which is correlated to the existence of an Fe-Dy alloy at the interface. The aim of this work is to investigate the magnetic properties of amorphous Fe/Dy multilayers by Monte Carlo simulations for different concentration profiles. Our model is based on a face centered cubic lattice where each node is a classical Heisenberg spin. We have considered an anisotropy model
based on a small concentration of uniaxial easy axis (in average), the other have a random easy axis. We evidence an inhomogeneous magnetisation profile related to the concentration profile. The Dy magnetic moment dispersion is lower in the case of diffuse concentration profile, contrary to Fe magnetic moment dispersion. Hysteresis loops simulation give a good agreement with experimental results. In particular, our anisotropy model allow an explanation of the hard direction hysteresis loop opening. When the field is applied perpendicular to the layer, the hysteresis loops of the diffuse profile are characteristic of a perpendicular anisotropy.
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https://tel.archives-ouvertes.fr/tel-00226371
Contributor : Etienne Talbot <>
Submitted on : Wednesday, January 30, 2008 - 3:27:05 PM
Last modification on : Thursday, May 16, 2019 - 1:18:02 PM
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  • HAL Id : tel-00226371, version 1

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Etienne Talbot. Etude des propriétés magnétiques de multicouches Fe/Dy par simulations numériques Monte Carlo. Matière Condensée [cond-mat]. Université de Rouen, 2007. Français. ⟨tel-00226371⟩

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