Abstract
We have studied the magnetostatic energies of three different kinds of ferromagnetic trilayer structures in which a nonmagnetic spacer inserts. It is shown that the surface roughness results in an additional effective perpendicular anisotropy. In the continuous and hybrid multilayer structures, the roughness-induced anisotropy is inversely proportional to the film thickness; however, the behavior disappears in discontinuous one. By considering the correlation between the surfaces, the effective perpendicular anisotropy can be further increased with increasing roughness and interlayer thickness.
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