Stock material or miscellaneous articles – Magnetic recording component or stock – Magnetic head
Reexamination Certificate
2006-09-05
2006-09-05
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Magnetic head
C428S812000, C428S816000, C360S119050
Reexamination Certificate
active
07101633
ABSTRACT:
An electroplated magnetic thin film consisting of an electroplated film of Fe—Co alloy containing Fe by an amount of 52–86 wt % and having a highly packed fine crystal grain structure, a flat and glossy surface, a high saturation magnetic flux density not less than 2.1 T, a low coercive force of 5–10 Oe, and being particularly suitable as a pole portion of a thin film magnetic head is proposed. The electroplated magnetic thin film is deposited on a substrate by an electroplating process with a pulsatory current or direct current having a current density of 3–120 mA/cm2while using an electroplating bath containing one or both of sulfate salt and hydrochloric salt serving as supply sources of Fe ions and Co ions, saccharin sodium serving as a stress relaxation agent by an amount not less than 1 g/l, boric acid as a pH buffer agent, ammonium chloride as an electrically conductivity salt, and sodium lauryl sulfate as a surfactant.
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Bozorth, “FERROMAGNETISM”, IEEE Press, pp. 160-181.
The Surface Finishing Society of Japan Representations at 105thMeeting, Mar. 13-15, 2002 (Manufacture of Plated Magnetic Thin Film of CoFe having High Saturation Magnetic Flux Density, K. Imai et al.) (with abstract).
Ichihara Shigeru
Mino Tetsuya
Yamaguchi Atsushi
Yari Seiji
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