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Spinel ferrite Co-γFe2O3 perpendicular media on exchange-coupled underlayers

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7 Author(s)
Koujima, J. ; R&D Div., Toda Kogyo Corp., Hiroshima, Japan ; Nakata, K. ; Ando, T. ; Shimomai, K.
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Spinel ferrite Co-γFe2O3 films have the advantages of high coercivity, high stability without a protective layer, and low noise performance for magnetic recording layers. Also, exchange-coupled Co-Zr-Nb/Co-Sm underlayers show superior characteristics. The Co-Sm hard magnetic layer pins the domains of the Co-Zr-Nb soft magnetic layer effectively and decreases the noise coming from the latter. By combining the Co-γFe2O3 recording layer and exchange-coupled Co-Zr-Nb/Co-Sm underlayers, the triple-layered perpendicular media show promise for ultrahigh-density perpendicular recording.

Published in:

Magnetics, IEEE Transactions on  (Volume:39 ,  Issue: 4 )

Date of Publication:

July 2003

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