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Electrodeposition and nanostructures

par Anne-Marie - publié le , mis à jour le

We are investigating functional nanostructures for magnetism and optics. Our objective is establishing correlation between their physical properties with their morphology, crystalline structure, local atomic environment (alloys) and surface chemistry. To this end we investigate the elementary steps of electrochemical epitaxial growth. (Fig. 1) et also ways to nanostructure them. Our work relies on in situ STM and structural x-ray characterization (XRD, XRR, EXAFS) et the development of in situ methods to characterize properties, in particular magnetic properties.

Fig. 1 : (a) Scheme showing the elementary steps during electrochemical growth ; (b) in situ STM image (100 x 100 nm) of a sub-surface cobalt biatomic layer on Au(111). The Au surface is blue and the cobalt islands are colored in green.

Current Projects :

- Voltage control of magnetization anisotropy energy in ultrathin films:
We take advantage of the very large electric field existing at the electrochemical interface to modify the magnetization anisotropy of epitaxial ultrathin films. Our in situ real time magnetic characterizations (MOKE) demonstrate that large magneto-electric coupling is accessible.

- Surface alloys by codeposition:
We study the nucleation of monometallic layers A or B and the microstructure of monolayers grown by codeposition of two metals A and B on single crystal Au(111) electrodes. Elements A = Ni, Co and B = Au, Pd, Ag are selected to compare systems going from phase separation to solid solution in the bulk phase.

Recent results :
Growth and magnetism of elecrodeposited ultrathin layers
Magnetic nanostructures by self organized electrochemical growth
Electrochemical nanolithography
Buffer layers Au(111)/H-Si(111) by electrodeposition
Electrodeposition on bimetallic surfaces
Preparation of ideal H-Si(111) surfaces