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Stacked Structure Media for High Density Perpendicular Recording

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3 Author(s)
Ariake, J. ; Akita Prefectural R&D Center ; Watanabe, S. ; Honda, Naoki

Perpendicular magnetic recording media with a new stacked media structure are proposed in this study. A distinct magnetically isolated granular Co-Pt-TiO2 film and a Co-Pt top layer for controlling an exchange coupling of the granular film were used to realize the stacked layer. By adding the top Co-Pt layer, Hs (saturation field) becomes small with reduced DeltaHc/Hc (narrower magnetic anisotropy distribution) and increased KuV/kBT (enhanced thermal stability). By changing Ar gas pressure of the top layer deposition, the exchange coupling of the granular layer could be precisely controlled. Film microstructure analysis revealed that a Co-Pt top layer deposited at high Ar gas pressure forms a granular structure. On the other hand, low gas pressure deposition formed a continuous structure with grains connected each other similar to a continuous layer of the CGC (coupled granular continuous) media

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 6 )