Self - assembled magnetic nanostructures prepared by molecular beam epitaxy on low energy surfaces

Self-assembled magnetic nanostructures prepared by molecular beam epitaxyon low energy surfacesNanostructures of MxPt1−x (M=Co and Fe) alloys have perpendicular magnetic aniso-tropy which makes them good candidates as high density magnetic recording media. Inthis thesis work, the structural and magnetic properties of these nanostructures werestudied as a function of the substrate (structure, symmetry and surface energy) and theco-deposition temperature. The nanostructures were prepared by co-deposition of transi-tion metal atoms on low energy surfaces WSe2(0001) and NaCl(001) by molecular beamepitaxy. This led to the formation of stress-free nanostructures whose properties werecharacterized by techniques including X-ray diffraction, XAFS, GISAXS, TEM, STM andSQUID magnetometry. The chemical order effects at shortand long-range and the influ-ence of morphology and growth direction on magnetic properties were clearly shown.