INVESTIGATION OF HIGH-COERCIVITY FePt-C NANOGRANULAR FILMS FOR PERPENDICULAR MAGNETIC RECORDING (PMR) MEDIA

摘要

In this work, we studied FePt-C nanogranular films for ultrahigh-density perpendicular recording media towards 1 Tbits/in2 because they have high magnetocrystalline anisotropy at its L10-phase. We deposit Fe52Pt48-C50% (7.2 nm) films on oxidized silicon substrates at 400°C and various Ar pressures. Results show that at the Ar pressure of 0.50 Pa, the FePt-C granular film has the best granular structure and MH loop shape with a perpendicular coercivity of 20 kOe. The average grain size of the optimized film is 6.4 ± 1.5 nm. We studied the thermal stability of the optimized film and obtained the energy barrier Eb of 340kBT at room temperature, meaning excellent thermal stability as magnetic recording media.