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Thin films of Co/Ru(0001) are known to exhibit an unusual spin reorientationtransition (SRT) coupled to the completion of Co atomic layers for Cothicknesses under 4 layers. By means of spin-polarized low-energy electronmicroscopy, we follow in real space the magnetization orientation during thegrowth of atomically thick capping layers on Co/Ru(0001). Capping withcoinage-metal (Cu, Ag, Au) elements modifies the SRT depending on the Co andoverlayer thickness and on the overlayer material, resulting in an expandedrange of structures with high perpendicular magnetic anisotropy. The origin ofthe SRT can be explained in terms of ab-initio calculations of thelayer-resolved contributions to the magnetic anisotropy energy. Besides thechanges in the SRT introduced by the capping, a quantitative enhancement of themagnetic anisotropy is identified. A detailed analysis of the interplay betweenstrain and purely electronic effects allows us to identify the conditions thatlead to a high perpendicular magnetic anisotropy in thin hcp Co films.

Coinage-metal capping effects on the spin-reorientations of Co/Ru(0001)