| Titre : |
Étude des propriétés magnétiques des superréseaux DyFe2/YFe2 par la méthode monte carlo |
| Type de document : |
texte imprimé |
| Auteurs : |
Saousen Djedai, Auteur ; Pierre Emmanuel Berche, Directeur de thèse |
| Editeur : |
Constantine : Université Mentouri Constantine |
| Année de publication : |
2015 |
| Importance : |
139 f. |
| Format : |
30 cm. |
| Note générale : |
2 copies imprimées disponibles
|
| Langues : |
Français (fre) |
| Catégories : |
Français - Anglais
Physique
|
| Tags : |
Sciences des matériaux Phase de laves super-réseaux DyFe2/YFe2 ferrimagnétisme anisotropie magné-
tique uniaxiale effet Zeeman intégrale d’échange spins de Heisenberg paroi d’interface simulation Monte Carlo cycle d’hystérésis Laves phase superlattices DyFe2/YFe2 ferrimagnetism uniaxial magnetic anisotropy Zeeman effect exchange coupling Heisenberg spins wall interface Monte Carlo simulation hysteresis loop المعادن غير المتجانسة متعدد آلش بكات فيريمغناطيسي طاقة تباين المغنطة آلبلورية
تأ ثير زيمان طاقة التفاعل آشعة اللف الذاتي له نيبار محاكاة مونتي كاغلو )C M( منحنيات المغنطة |
| Index. décimale : |
530 Physique |
| Résumé : |
The heterostructure consisted of a hard magnetic material and a soft magnetic material, allow the manufacture of artificial domain wall through an exchange coupling at the interface range. Typical examples of such compounds are superlattices DyFe2/YFe2 consist of alternating layers of hard ferrimagnetic materials DyFe2 and soft ferrimagnetic layers YFe2. This thesis is evoted to study by numerical Monte Carlo simulation the process of magnetization reversal of superlattices DyFe2/YFe2.
Previous experimental studies on inter-metallic superlattices, show a wide variety of results that tell us about the magnetic behavior of these superlattices for different temperatures and for a set thicknesses for the hard magnetic layer (DyFe2) relative to the soft magnetic layer (YFe2).
For a better understanding of magnetic behavior, we undertook a model of Heisenberg spins vector allowing any rotation of the spins in space, the model is suitable for studying non-collinear magnetic structures, such as superlattices DyFe2/YFe2. The magnetic energy of these superlattices is the result of three contributions: the exchange energy, magnetocrystalline anisotropy and the Zeeman effect in the presence of an applied magnetic field. The objective of this work is to study the effect of the relative thickness and the influence of temperature on the
magnetic properties of DyFe2/YFe2 superlattices. In these systems, it is generally agreed that the magnetization reversal process takes place by the development of walls in the soft magnetic material (YFe2), followed by irreversible magnetization reversal of the hard magnetic material (DyFe2). The simulation of hysteresis loops allowed us to get a good qualitative agreement with experimental results.
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| Diplôme : |
Magistère |
| En ligne : |
../theses/physique/DJE6730.pdf |
| Format de la ressource électronique : |
pdf |
| Permalink : |
https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9893 |
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Étude des propriétés magnétiques des superréseaux DyFe2/YFe2 par la méthode monte carlo
