Abstract
Granular-type [( Co 90 Cr 10)85 Pt 15]89.8-[ SiO 2]10.2 films were prepared by using co-sputtering methods, with Ru as a seed layer. Influences of Ru thickness on the micro-structure and magnetic properties of the CoPtCr-SiO 2 magnetic layer were investigated. It was found that the seed layer obviously effected the grain isolation, c-axis distribution and magnetic parameters. The Ru seed layer with a suitable thickness is very helpful for achievement of high anisotropy, proper coercivity and high squareness. The anisotropy energy of the magnetic layer can be as high as 5×106 erg/cm 3 or more, even with a thin Ru layer, promising good thermal stability. It was noted that the Ru layer markedly enhanced the isolation of CoPtCr grains, corresponding to the increase of coercivity and the decrease of loop slope. Moreover, it was also revealed that the addition of SiO 2 to CoPtCr effectively isolated the CoPtCr grains without disturbing the epitaxial growth of CoPtCr grains on the Ru seed layer.
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