FeTaC Magnetic Soft Underlayer for L10 FePt Based Perpendicular Recording Media
Abstract:FeTaC magnetic soft underlayer under elevated temperature process conditions for L10 FePt based perpendicular recording media has been investigated. After annealing FeTaC for 40 min at 350 °C, saturation moment increases to 750 emu/cm3 and, coercivity and remanent moment reduce to 2.3 Oe and 166 emu/cm3 respectively. The microstructure of FeTaC annealed at 350 °C for 40 min composes of Fe nanocrystals with random orientations immersed in an amorphous matrix. FeTaC surface roughness due to elevated temperature process is reduced by 100 W RF plasma etching and CrRu with (200) orientation is developed. It is found that changing elemental composition due to C diffusion into the CrRu layer and RF preferential etching over Fe, Ta and C has the influence on the magnetic properties of FeTaC.
Document Type: Research Article
Publication date: 2011-03-01
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