[Zurück]

H.S. Jung, S. Malhotra, B. Acharya, G. Bertero, D. Süss:
"Effect of magnetic softness in a soft layer on media properties of hard/soft stacked composite perpendicular media";
Journal of Applied Physics, 105 (2009), S. 07B740-1 - 07B740-3.

Adding Pt into CoCr-oxide alloy for controlling magnetic softness in a soft layer on hard/soft (H/S) stacked composite media significantly affects magnetic properties and microstructure. Hc values for capping layer (CL) media with a relatively high-Hk soft layer initially increase with increasing tcap. However, Hc values are relatively constant for H/S media with Pt 3% and 10% soft layers and reduced for the media with a CoTaZr-SiO2 soft layer having in-plane Hk. The simulation results explain these experimental Hc trends by the compensation effect between the decrease in average Ku due to the use of less-Ku soft layer and the increases in volume with increasing tsoft. Reduction in Hc with increasing tsoft is anticipated when Ku in a soft layer reduces by >27%. As the Pt content in a soft layer increases from 3% to 18%, higher Hc and Hn but lower Hs are observed. Plan-view transmission electron microscopy images for the medium with Pt 18% soft layer show no subgrains and thinner grain boundary width and explain the significant increase in lateral Aex. Thus, the Pt content in a soft layer needs to be optimized. Compared to CL media, H/S composite media with the Pt 5% and 8% soft layers improve both SNRme and media writability.

http://dx.doi.org/10.1063/1.3073667

http://link.aip.org/link/?JAPIAU/105/07B740/1