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The face-centered-tetragonal L10FePt films with (001) preferred orientation has perpendicular coercivity (Hc⊥) of about 2462Oe that can be achieved by stacking a structure of (FePt4nm∕Ag2nm)5 multilayer films on the 5nm thick MgO underlayer and annealing at 600°C for 30min. It is found that both the perpendicular anisotropy and coercivity of (FePt4nm∕Ag2nm)5 multilayer films are enhanced by introducing an Ag buffer layer (≦20nm) between the (FePt4nm∕Ag2nm)5 films and the MgO underlayer. When introducing an Ag buffer layer of 20nm thickness, the Hc⊥ value of the MgO5nm∕Ag20nm∕(FePt4nm∕Ag2nm)5 multilayer films is observed to increase from 2462to4731Oe, which has significant potential as perpendicular magnetic recording media for high-density recording.
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Chen et al. (2005) studied this question.
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