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Ru/FeCoB crystalline soft magnetic underlayers with high anisotropy field for CoPtCrSiO2 granular perpendicular magnetic recording media

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7 Author(s)
Matsuu, Toshimitsu ; Department of Physical Electronics, Tokyo Institute of Technology, 2-12-1-S3-42 O-okayama, Meguro-ku, Tokyo 152-8552, Japan ; Hirata, Ken-ichiro ; Hashimoto, Atsuto ; Matsunuma, S.
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Ru/FeCoB/Ru/CoPtCrSiO2 films were fabricated as perpendicular magnetic recording media with crystalline soft magnetic underlayer (SUL). Ru/FeCoB layers possessed high in-plane anisotropy field Hk of 400 Oe and a bcc-FeCo (110) orientation. Crystalline orientation of the FeCoB in the SUL affected on a crystallite growth of a Ru intermediate layer deposited on it and on crystallite orientation of the CoPtCrSiO2 film deposited on the Ru intermediate layer. Ru/CoPtCrSiO2 films without Ru/FeCoB SULs exhibited a random orientation of Ru crystallites and the in-plane magnetic anisotropy. On the other hand, Ru/CoPtCrSiO2 films deposited on the Ru/FeCoB SULs exhibited (001) preferential orientations of the CoPtCr as well as the Ru intermediate layer and possessed perpendicular magnetic anisotropy. It was confirmed that the improvement of a bcc-FeCo (110) orientation in the SUL was effective to the improvement of a hcp-Ru (001) orientation. At the media for an intermediate layer thickness of 5 nm, the similar magnetic properties as that of 30 nm were obtained. It indicated that the application of a crystalline SUL promoted the reduction in the intermediate layer thickness.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 7 )