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Making Permalloy Films

IP.com Disclosure Number: IPCOM000073450D
Original Publication Date: 1970-Dec-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Manley, GW: AUTHOR [+3]

Abstract

Thermally stable permalloy type alloy films are deposited on a conductive substrate by electroplating from an ammoniacal alkaline bath containing sulfite bearing additives. A suitable bath formulation is made within the following concentration ranges: Nickel Sulfamate 0.08 - 0.35 M Ferric Ammonium Sulfate 0.006 - 0.25 M Ammonium Sulfate 0.025 - 0.160 M Sodium Potassium Tartrate 0.025 - 0.160 M Ammonium Hydroxide 0.75 - 3.0 M Sodium Meta-Bisulfite up to 0.5 M or Sodium Sulfite up to 0.8 M pH 9-11 A typical list of stock solutions are useable as follows: Nickel Sulfamate 451 grams/liter Ferric Ammonium Sulfate 135 g/1 +0.5 ml conc. H(2)SO(4) Ammonium Sulfate 281 g/1 Sodium Potassium Tartrate 601 g/1 Ammonium Hydroxide 31% +0.5% Sodium Meta-Bisulfite A.C.S. grade Sodium Sulfite A.C.S.

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Making Permalloy Films

Thermally stable permalloy type alloy films are deposited on a conductive substrate by electroplating from an ammoniacal alkaline bath containing sulfite bearing additives. A suitable bath formulation is made within the following concentration ranges: Nickel Sulfamate 0.08 - 0.35 M Ferric Ammonium Sulfate
0.006 - 0.25 M Ammonium Sulfate 0.025 - 0.160 M Sodium Potassium Tartrate
0.025 - 0.160 M Ammonium Hydroxide 0.75 - 3.0 M Sodium Meta-Bisulfite up to
0.5 M or Sodium Sulfite up to 0.8 M pH 9-11 A typical list of stock solutions are useable as follows: Nickel Sulfamate 451 grams/liter Ferric Ammonium Sulfate 135 g/1 +0.5 ml conc. H(2)SO(4) Ammonium Sulfate 281 g/1 Sodium Potassium Tartrate 601 g/1 Ammonium Hydroxide 31% +0.5% Sodium Meta-Bisulfite A.C.S. grade Sodium Sulfite A.C.S. grade A typical alkaline electroplating bath could be composed as follows: Nickel Sulfamate 172.0 ml Ferric Ammonium Sulfate 88.0 ml Ammonium Sulfate 52.0 ml Sodium Potassium Tartrate 72.0 ml Ammonium Hydroxide 200.0 ml Sodium Meta-Bisulfite or 50.0 grams Sodium Sulfite (aqueous solutions 100.0 grams pH 9.8 - 10.2.

The above bath is diluted to a 1 liter volume with distilled water. The bath sequence must be made in the order indicated to insure proper complex formation and ammonium hydroxide dissociation when the solution is adjusted to its final volume.

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