Co/Pt人工格子垂直磁気記録媒体へのB添加効果とNiAlシード層効果(磁気記録媒体)

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The effect of boron doping on the magnetic and recording performance was examined in [Co (0.4 nm)/Pt (1 nm)]_9 superlattice media, and ways of reducing media noise while maintaining a large perpendicular anisotropy K_u were discussed. The boron was doped only in the Co layer. The K_u was found to decrease as the boron content increased beyond 15 vol.%, while maintaining a large value of 5.7×10^6 erg/cm^3 even at 30 vol.% in the Co layer. Moreover, the addition of boron was found to reduce the strength of intergranular exchange coupling, probably owing to the reduction of the exchange stiffness, resulting in an improvement of the signal-to-medium-noise ratio, SN_mR. It was also shown that the use of an NiAl seed layer for Co/Pt superlattice media enhances grain segregation, resulting in an improvement of SN_mR. However, no significant improvement in SN_mR was achieved by the boron doping for [Co (0.4 nm)/Pt (1 nm)]_9 media with an NiAl seed layer.
2003-04-01