| Abstract |
The objective of the project is the elaboration of new magnetic nanostructures and the investigation of their magnetic properties. These magnetic nanostructures will be elaborated in the 'bottom-up" approach. Once developed the original nanostructures, we will perform in-situ the investigation of their magnetic properties (reversal of magnetization, superparamagnetism an interactions). The control of the epitaxial growth under ultra-high vacuum conditions will allow the fabrication of new kinds of nanostructures. Two methods will be used to achieve this goal: self organisation and co-adsorption of two immiscible metals in volume. In the self-organisation approach, the host group has the experience of previous work during the last ten years. Nanostructures with macroscopic order architecture will be created. Current systems wil te Co and Fe nanostructures grown on templates such as Au(l 11) vicinais or Pt(l 11) vicinais. We wil explore the combination of step arrays with dislocations networks since the pioneering system of Co/Au(788) has already revealed promising results. The second approach to develop nanostructures will be the co-adsorption of two immiscible metals in volume under surface stresses induced by the substrate. This happens when the adsorbed metals have a bulk lattice parameter respectively smaller and larger than the one of the substrate. Systems such as Co and Ag on Ru or Rh substrates will be studied. This will also provide supported dilute magnetic systems interesting for nanomagnetism. After the development of the nanostructures, we will focus on their magnetic properties. We will study the energetic barrier for magnetisation reversal of one particle versus the size of the particle, which is still a challenging question in such small magnetic nanostructures. We will also study other magnetic properties that are essential in information storage and/or in spin electronics, like magnetic anisotropy, and magnetisation flipping processes.
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