The effect of Pt on the magnetic anisotropy of grains and intergranular exchange coupling in (Co86Cr12Ta2)100-xPtx (x = 1-8) and (Co62.5Ni30Cr7.5)100-xPtx (x = 0-16) thin-film media has been investigated. In both kinds of media, the magnetocrystalline anisotropy field of the grains, Hkgrain, increases to twice as large as that at x = 0 by increasing x to about 9 at%. This is caused mainly by an increase in the magnetocrystalline anisotropy of the grains. The coercive force Hc increases with increasing Pt content, due mainly to the increase in Hkgrain, although Hc/Hkgrain gradually decreases with increasing Pt in these media. In the CoCrTaPt media, the decrease in Hc/Hkgrain with increasing Pt is caused mainly by an increase in the strength of the intergranular exchange coupling. In the CoNiCrPt media, the change in the c-axis direction from in-plane to normal with increasing Pt is suggested to play a major role in the reduction of Hc/Hkgrain.
|Number of pages
|Journal of Magnetism and Magnetic Materials
|Published - 1996
|Proceedings of the 1995 6th International Conference on Magnetic Recording Media, MRM - Oxford, UK
Duration: 1995 Jul 16 → 1995 Jul 19