FePtAg-C Nanogranular Film as Thermally Assisted Magnetic Recording (TAR) Media

摘要

We studied highly $L1_{0}$ -ordered FePtAg-C nanogranular film as a potential high-density storage medium for thermally assisted magnetic recording (TAR). A 6.4-nm-thick FePtAg-C film was fabricated on an oxidized silicon substrate with a 10-nm MgO underlayer at 550$^{circ}$ C, with the perpendicular coercivity of 35 kOe, and average grain size of 6.2 $pm$ 1.4 nm. The time-dependence measurement of remnant coercivity results in the energy barrier $E_{b}=5.1 {rm eV}sim 200 k_{rm B}T$, meaning excellent thermal stability for long-term data storage. The static tester experiments by TAR head demonstrated an areal density of 550 Gb/in$^{2}$ .