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CoPtCr-SiO2 perpendicular media for high density recording with a high order magnetic anisotropy energy term

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10 Author(s)
Shimatsu, T. ; Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan ; Sato, H. ; Oikawa, T. ; Mitsuzuka, K.
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The first and second order energy terms of uniaxial magnetic anisotropy, Ku1 and Ku2, of CoPtCr-SiO2 perpendicular recording media were studied as a function of film composition and film structure. Moreover, the fabrication of CoPtCr-SiO2 media having adequate values of Ku1 and Ku2 for high recording density was preliminarily studied. An analysis of CoPtCr films with various kinds of seed layer materials revealed that the values of Ku1 and Ku2 varied significantly with the seed layer material used, probably due to epitaxial growth of CoPtCr on the seed layers. Ku2 increased, accompanied by a reduction in Ku1 as the c/a ratio of the hcp-CoPtCr lattice increased. Moreover, experimental results suggest that a high stacking-fault density enhances the Ku2 values, especially in the high Pt content region. The addition of SiO2 reduces the total anisotropy, Ku1+Ku2, but no significant change in the ratio of Ku2/Ku1 was observed. The fabrication of CoPtCr-SiO2 media with adequate values of Ku1 and Ku2 was successfully demonstrated, although more intensive efforts to enhance grain isolation are required to confirm the advantages conferred by the Ku2 term.

Published in:

Magnetics, IEEE Transactions on  (Volume:41 ,  Issue: 10 )

Date of Publication:

Oct. 2005

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