Granular L1_0 Fept:tio_2 (001) Nanocomposite Thin Films With 5 Nm Grains For High Density Magnetic Recording

摘要

FePt:TiO_2 (001) thin films were deposited on CrRu/MgO underlayers by dc magnetron cosputtering. The effects of TiO_2 content on microstructure and magnetic properties of the epitaxial FePt (001) films were studied. Experimental results showed that even with 20 vol % TiO_2 doping, FePt films could keep a (001) preferred orientation and perpendicular anisotropy. The FePt:TiO_2 (001) film with 5 nm grain size, adjustable coercivity, and reduced exchange coupling was obtained by doping 20 vol % TiO_2 into FePt film, showing great potential as low noise ultrahigh density perpendicular magnetic recording media.