5th INTERNATIONAL WORKSHOP ON ELECTRODEPOSITED NANOSTRUCTURES 7-9 June 2007, Iasi, Romania	ABSTRACTS

Ultrathin magnetic layers grown on Au(111) by electrochemistry P. Allongue, F. Maroun, G. Savidand, N. Tournerie, P. Prod'homme Physique de la Matière Condensée, CNRS, Ecole Polytechnique, Palaiseau, France E-mail: Philippe.Allongue@Polytechnique.fr Magnetic properties, in particular anisotropy, are sensitive to the atomic scale environment as well as to long range crystallographic structure. For instance, the magnetic moment of magnetic ultrathin films may be out of plane while the 2D shape would impose an in-plane orientation. This phenomenon, called perpendicular anisotropy (PMA) is a manifestation of the strong influence of material crystallographic structure, elastic strains, hybridization at interface. PMA is of considerable interest for magnetic data storage. We have recently demonstrated that Co/Au(111) layers grown by electrochemistry from a modified Watts bath [1] present a strong PMA after capping the cobalt layer with a Cu film since M is out of plane for a cobalt thickness ~5 ML [1]. We also obtained epitaxial Co/Au multilayers in which each individual Co layer presents a perpendicular magnetization [2]. In this presentation, I will first review data coupling in situ STM observations and in situ magnetic measurements to discuss the magnetic properties of iron group metal layers electrodeposited on Au(111) layers. In the case of cobalt, which was studied more extensively, I will present new in situ real time Polar Magneto optical Kerr Effect (PMOKE) to discuss the unique behaviour observed at submonolayer surface coverage. The influence of the surface chemistry will be also discussed. References [1] L. Cagnon et al., Phys. Rev. B 63 (2001) 104419; P. Allongue et al., Surf. Sci. 557 (2004) 41. [2] P. Prod'homme et al., J. Magn. Magn. Mat. 315 (2007) 26.

 
 
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