Stock material or miscellaneous articles – Magnetic recording component or stock
Reexamination Certificate
2007-06-19
2010-11-30
McNeil, Jennifer C (Department: 1784)
Stock material or miscellaneous articles
Magnetic recording component or stock
C428S812000, C428S827000, C428S828000, C428S828100, C428S829000, C428S831000, C428S831200, C029S603070, C036S126000
Reexamination Certificate
active
07842408
ABSTRACT:
Embodiments of the present invention provide a magnetic disk drive capable of allowing higher data transfer rates and higher recording densities. According to one embodiment, an upper magnetic core and lower magnetic core comprise a multi-layered magnetic film formed by alternately stacking a face-centered cubic (fcc) crystalline magnetic thin layer and a body-centered cubic (bcc) crystalline magnetic thin layer by plating. The plating bath is such that the temperature is about 30±1° C., pH is about 2.0−1.0 to 2.0+0.5, metal ion concentrations are about 5 to 25 (g/l) for Ni2+ and 5 to 15 (g/l) for Fe2+, saccharin sodium concentration is about 1.5±1.0 (g/l), sodium chloride concentration is about 25±5 (g/l), and boric acid concentration is about 25±5 (g/l). Since each layer's crystal structure is different from that of its adjacent lower layer, epitaxial growth is broken within each layer. Thus, since crystal grains are reduced in size, it is possible to lessen the decrease of the permeability μ at higher frequencies.
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Kudo Kazue
Maruyama Yohji
Oikawa Gen
Saiki Noriyuki
Shiina Hiromi
Garcia Guadalupe M.
GMG Intellectual Property Law
Hitachi Global Storage Technologies - Netherlands B.V.
Katz Vera
McNeil Jennifer C
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