Anisotropy is one extremely important property of magnetic material, thin films and nanostructures because it determines device functioning and performances. Magnetic anisotropy is 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, we will first review data coupling in situ STM observations and real time in situ Polar Magneto optical Kerr Effect (PMOKE) measurements to discuss the magnetic properties of iron group metal layers electrodeposited on Au(111) layers. In the case of cobalt we will discuss the unique behaviour observed at submonolayer surface coverage. New investigations concerning the influence of surface chemical modification will be also presented.

References
[1] L. Cagnon et al. Phys. Rev. B 63(2001) 104419
[2] P. Prod’homme et al., J. Magn. and Magn Mat, 315 (2007) 26

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