Abstract: (FePt/Ag)n nano-multilayers were deposited on MgO (100) single crystal with laser ablation and then subjected to annealing. FePt L10 grains with (001) texture and thus a large perpendicular magnetic anisotropy constant Ku of the order of 10^6 J/m^3 were formed. A thick Ag layer is found to be favorable for decreasing the dispersion of the easy axis for magnetization. The measurement of time decay of magnetization gave rise to a small activation volume of the order of 10^-25m^3, showing the promising of being the recording medium for future high density perpendicular recording.

Key words: recording media, perpendicular magnetic anisotropy, activation volume,