Double layered perpendicular magnetic recording media with nanocrystalline structured FeHfN soft magnetic back layer

摘要

A disk for a hard disk drive. The disk includes a first layer of magnetic material located over a substrate, an intermediate layer located over the first magnetic layer and a second layer of magnetic material located over the intermediate layer. The second layer may include cobalt and chromium. The intermediate layer may include titanium. The first magnetic layer include iron, hafnium and nitrogen (FeHfN). This composition of the first magnetic layer shows higher saturation magnetization and lower roughness, and increases the nucleation field of the disk.