FeTaC Magnetic Soft Underlayer for L1₀ FePt Based Perpendicular Recording Media

Authors: Lwin, P.W.; Hu, J.F.; Lim, B.C.; Cher, K.M.; Zhou, T.J.

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 3, March 2011 , pp. 2665-2668(4)

Publisher: American Scientific Publishers

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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.

Keywords: SOFT MAGNETIC UNDERLAYER; FETAC; RF SURFACE TREATMENT

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2011.2736

Publication date: 2011-03-01

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