Abstract
We have studied the magnetic properties of Au (2nm)/Co50Pt50 (3nm)/Au (2nm) multilayer films prepared on amorphous Al2O3/Si and (001) MgO substrates. The as-deposited films on both substrates are magnetically soft with an FCC structure and exhibit a perpendicular anisotropy. After annealing at 500°C, the sample on the Al2O3/Si substrate has become magnetically isotropic but the sample on the MgO substrate still has perpendicular anisotropy with FCT structure. This film deposited on the MgO substrate did not show a strong perpendicular anisotropy due to the diffusion of the Au and the (111) nucleation of initial Au layer. We can obtain a perpendicular anisotropy in the multilayer films without an initial Au layer on a (001) MgO substrate. After annealing at 400°C, these films have L10 phase with (001) texture and strong perpendicular anisotropy.
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