Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating electrolytic or nonelectrolytic coating after it is...
Reexamination Certificate
2006-02-21
2006-02-21
Koehler, Robert R. (Department: 1775)
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating electrolytic or nonelectrolytic coating after it is...
C205S227000, C205S255000, C148S518000, C148S529000
Reexamination Certificate
active
07001499
ABSTRACT:
A process for electroplating and annealing thin-films of nickel-iron alloys having from 63% to 81% iron content by weight to produce pole pieces having saturation flux density (BS) in the range from 1.9 to 2.3 T (19 to 23 kG) with acceptable magnetic anisotropy and magnetostriction and a coercivity (HC) no higher than 160 A/m (2 Oe). The desired alloy layer properties, including small crystal size and minimal impurity inclusions, can be produced by including higher relative levels of Fe++ions in the electroplating bath while holding the bath at a lower temperature while plating from a suitable seed layer. The resulting alloy layer adopts a small crystal size (BCC) without significant inclusion of impurities, which advantageously permits annealing to an acceptable HCwhile retaining the high BSdesired.
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Chen Mike Ming Yu
Dinan Thomas Edward
Hixson-Goldsmith April
Ramasubramanian Murali
Robertson Neil Leslie
Feece Ron
Hitachi Global Storage Technologies - Netherlands B.V.
Koehler Robert R.
Nunnelley Lewis L.
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