Journal of the Magnetics Society of Japan
Online ISSN : 1882-2932
Print ISSN : 1882-2924
ISSN-L : 1882-2924

この記事には本公開記事があります。本公開記事を参照してください。
引用する場合も本公開記事を引用してください。

Reduction of Crystalline High-Bs Soft Underlayer Thickness for Obtaining Low Medium Noise in Epitaxial Perpendicular Recording Media
K. Shintaku
著者情報
ジャーナル オープンアクセス 早期公開

論文ID: 1008R001

この記事には本公開記事があります。
詳細
抄録

  CoPt-TiO2 granular-type media with extremely thin Ru intermediate layer of 1.9 nm were prepared on a highly oriented high-Bs FeCo soft underlayer (SUL) pinned by an IrMn antiferromagnetic layer. The FeCo SUL thickness was changed to reduce the medium noise. CoPt clusters surrounded by relatively wide boundaries were formed for the medium with the FeCo SUL of 40 nm. As the FeCo SUL thickness was decreased, the cluster size and the number of the CoPt grains was decreased. The CoPt grains were mostly isolated for the medium with the FeCo SUL of 20 nm. The average cluster size was 7.4 nm in diameter. The recording performance was evaluated by using a single-pole-type head. This new-designed medium has high writability and large reproduced output compared to an old-designed medium with an amorphous SUL of 80 nm and an intermediate layer of 30 nm. As the FeCo SUL thickness was decreased down to 10 nm, the medium noise was greatly decreased at the recording densities of more than 200 kfci. As a result, the S/N was increased as the FeCo SUL thickness was decreased down to 10 nm at the recording densities of more than 200 kfci. The film thickness of the FeCo SUL could be reduced down to 10-20 nm.

著者関連情報
© 2010 The Magnetics Society of Japan
feedback
Top