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Self-assembled magnetic nanostructures prepared by molecular beam epitaxy on low energy surfaces
Self-assembled magnetic nanostructures prepared by molecular beam epitaxy on low energy surfaces
- Source :
- Chimie. Institut National Polytechnique de Grenoble-INPG, 2009. Français
- Publication Year :
- 2009
- Publisher :
- HAL CCSD, 2009.
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Abstract
- Nanostructures of MxPt1x (M=Co and Fe) alloys have perpendicular magnetic anisotropy which makes them good candidates as high density magnetic recording media. In this thesis work, the structural and magnetic properties of these nanostructures were studied as a function of the substrate (structure, symmetry and surface energy) and the co-deposition temperature. The nanostructures were prepared by co-deposition of transition metal atoms on low energy surfaces WSe2(0001) and NaCl(001) by molecular beam epitaxy. This led to the formation of stress-free nanostructures whose properties were characterized by techniques including X-ray diffaction, XAFS, GISAXS, TEM, STM and SQUID magnetometry. The chemical order effects at short- and long-range and the in uence of morphology and growth direction on magnetic properties were clearly shown.<br />Les nanostructures d'alliages MxPt1x (M=Co et Fe) developpent des anisotropies magnetiques perpendiculaires, très interessantes pour des applications dans le domaine de l'enregistrement a haute densite. Dans ce travail de these, la nature du substrat (structure, symetrie et energie de surface) et l'in uence de la temperature de co-deposition sur les proprietes structurales et magnetiques des nanostructures ont ete etudies. La methode a consiste a deposer des atomes de metaux de transition par epitaxie a jets moleculaires sur les surfaces WSe2(001) et NaCl(001) de faible energie. Elle a conduit a la formation de nanostructures modeles, non contraintes dont les proprietes ont ete determinees par differentes techniques (diffraction X, XAFS, GISAXS, MET, STM et magnetometrie SQUID). Les effets de mise en ordre chimique a courte et a longue distance et l'infl uence de la morphologie et de la direction de croissance sur les proprietes magnetiques ont ete clairement demontres.
- Subjects :
- [CHIM.MATE] Chemical Sciences/Material chemistry
magnetic anisotropy
Anisotropie magnetique
X-ray absorption spectroscopy
Diffusion aux petits angles en incidence rasante
[CHIM.MATE]Chemical Sciences/Material chemistry
Grazing-Incidence Small-Angle X-ray Scattering
Nanostructures
Spectroscopie d'absorption de rayon x
[CHIM] Chemical Sciences
Ordre chimique a longue distance
[CHIM]Chemical Sciences
CoPt et CoPt3 alliages
CoPt and CoPt3 alloys
Long-range chemical order
FePt
Subjects
Details
- Language :
- French
- Database :
- OpenAIRE
- Journal :
- Chimie. Institut National Polytechnique de Grenoble-INPG, 2009. Français
- Accession number :
- edsair.dedup.wf.001..0e8e09fb4a366897755f1172863061bf