Abstract
Thermally assisted magnetic recording (TAR), a promising approach to extend data storage densities beyond 1 terabit/in.2, requires high anisotropy granular magnetic media with small grains and a tight grain size distribution. We demonstrate sputtered chemically ordered granular L10 Fe45Pt45Ag10 media using carbon segregant on glass substrates. X-ray diffraction and transmission electron microscopy reveal high chemical ordering, an average grain size of 〈D〉 = 7.2 nm and a size distribution as low as σD/〈D〉=16%. Magnetic properties studied with a vibrating sample magnetometer show Hc = 4.8 T, Hk > 9 T, and Ku > 4.5 × 107 erg/cm3. Drag testing of this media shows recording areal densities of 620 Gb/in.2.
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