L1_0 ordered FePt based double-layered perpendicular recording media with (002) oriented FeCo films as a soft magnetic underlayer

摘要

The introduction of the soft magnetic underlayer (SUL) in perpendicular recording technology is to further increase the recording areal density. However, problems such as growth of the uncontrollable recording layer and additional media noise contributed from the SUL could be resulted. In this work, a synthetic antiferromagnetically (SAF) coupled (002) oriented Fe_(65)Co_(35) film as an SUL was developed for Ll_0 ordered FePt based double-layered recording media. The crystallography of hetero-epitaxially grown double-layered media CrRu/(Ru/FeCo)_2/Pt/FePt/Ru was demonstrated. The L1_0 ordered FePt based double-layered perpendicular recording media with SAF coupled FeCo films as the SUL were developed.