Exchange coupling optimization on CoPtCrO perpendicular media
Y. Ikeda, K. Takano, et al.
INTERMAG 2003
We investigated coupled granular/continuous (CGC) perpendicular media consisting of a continuous multilayer for high thermal stability and a granular host layer to reduce noise. The addition of Co/Pt multilayers increased the nucleation field of the CoCr18Pt12 medium from 0 to -2000 Oe. Moreover, the moment decay was reduced from 4.8% to 0.1% per decade. Compared to Co/Pd multilayer media, the CGC medium had a 10 dB higher signal-to-noise ratio (SNR). The granular host layer significantly improved the SNR in the high-density region over 10 kfc/mm. Compared to the CoCr20Pt10 medium, the CGC medium had a 3 dB higher SNR in the low-density region. The medium noise for the CGC medium increased with the recording density, while the noise for the CoCr20Pt10 medium remained constant from 10 to 20 kfc/mm. The approach using CGC medium improves both the SNR and the thermal stability.
Y. Ikeda, K. Takano, et al.
INTERMAG 2003
Y. Sonobe, H. Muraoka, et al.
Journal of Applied Physics
D. Weller, L. Folks, et al.
Journal of Applied Physics
K. Le Dang, P. Veillet, et al.
Physical Review B