Laminated nanocrystalline soft underlayers for perpendicular recording

Media with laminated [Fe(Ta,Ti,Nb)C/Ta]n=2–4 soft magnetic underlayers (SULs) were prepared, and the effect of lamination on spike noise was investigated. Cross-sectional transmission electron microscopy observation revealed that nanocrystalline layers, composed of α-Fe grains with three-dimensional...

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Bibliographic Details
Published in:Journal of applied physics 2003-05, Vol.93 (10), p.6766-6768
Main Authors: Tanahashi, Kiwamu, Kikukawa, Atsushi, Takahashi, Yoshio, Hosoe, Yuzuru
Format: Article
Language:English
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Summary:Media with laminated [Fe(Ta,Ti,Nb)C/Ta]n=2–4 soft magnetic underlayers (SULs) were prepared, and the effect of lamination on spike noise was investigated. Cross-sectional transmission electron microscopy observation revealed that nanocrystalline layers, composed of α-Fe grains with three-dimensional random orientation, were physically separated by 2.5-nm-thick Ta layers. Laminated SULs had low coercivities, i.e., less than 0.2 Oe, when the total thickness of the SUL ranged from 200 to 400 nm and the thickness of each nanocrystalline layer was more than 50 nm. These low coercivities are probably due to magnetostatic interaction between adjacent nanocrystalline layers. The medium with a laminated SUL showed much lower spike noise than the medium with a single-layer SUL. It is thought that magnetostatic interaction can reduce the stray field from the SUL, and result in a decrease in spike noise.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1557720