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Browse Prior Art Database

Preparation of Aging Resistant Magnetic Permalloy Films

IP.com Disclosure Number: IPCOM000090932D
Original Publication Date: 1969-Aug-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Tan, SI: AUTHOR [+3]

Abstract

Aging-resistant permalloy films with improved magnetic properties are plated from a plating bath which has this composition. NiSO(4).6H(2)O 15 g/l FeSO(4).7H(2)O 2.25 g/l Na - K Tartrate 7.5 g/l Sulfamic Acid 1.0 g/l Triton X-100 0.6 g/l pH 3 - 4.

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Preparation of Aging Resistant Magnetic Permalloy Films

Aging-resistant permalloy films with improved magnetic properties are plated from a plating bath which has this composition. NiSO(4).6H(2)O 15 g/l FeSO(4).7H(2)O 2.25 g/l Na - K Tartrate 7.5 g/l Sulfamic Acid 1.0 g/l Triton X-100
0.6 g/l pH 3 - 4.

An equal molar quantity of Fe/3+/ can be substituted for Fe/2+/ in the bath. The bath is contained in a rectangular cell with a cathode having the same geometric dimensions as the anode. Plating is by the pulse-plating technique using square pulses of 5.6 ma/cm/2/ amplitude and a width of 15 seconds. Each current pulse is followed by ~10 sec. of stirring of the solution and 15 to 30 sec. of a rest period. The current density can vary in the range of from about 4 ma/cm/2/ to about 6 ma/cm/2/.

The films thus produced are stabilized at 200 degrees C in an easy axis, 40 Oe field in air for at least 2 hours. Upon subsequent aging at 100 degrees C in a 20 Oe field for 67 hours in air at 45 degrees to the easy axis direction, the films exhibit a high degree of resistance against aging, i.e., unusually small changes in the static magnetic properties.

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