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Chemical Nickel Iron Cobalt Boron Films

IP.com Disclosure Number: IPCOM000092825D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Koretsky, H: AUTHOR [+2]

Abstract

The coercive force of chemical nickel-iron-boron films can be increased and the insensitivity against stray fields and disturb pulses is improved, if small amounts of cobalt salts are added to the chemical plating bath for nickel-iron-boron films. A typical bath contains: 22 millimols/liter dimethylamine borane 115 millimols/liter sodium potassium tartrate 56 millimols/liter nickelous chloride 2.6 millimols/liter ferrous ammonium sulphate 0.1-5.0 millimols/liter cobalt 2850 millimols/liter ammonia.

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Chemical Nickel Iron Cobalt Boron Films

The coercive force of chemical nickel-iron-boron films can be increased and the insensitivity against stray fields and disturb pulses is improved, if small amounts of cobalt salts are added to the chemical plating bath for nickel-iron-boron films.

A typical bath contains: 22 millimols/liter dimethylamine borane 115 millimols/liter sodium potassium tartrate 56 millimols/liter nickelous chloride

2.6 millimols/liter ferrous ammonium sulphate

0.1-5.0 millimols/liter cobalt 2850 millimols/liter ammonia.

Activated surfaces are dipped in the bath kept at 65 degrees C. The coercive force of the deposits is up to about ten times as high as the coercive force of nickel-iron-boron deposits of the same thickness and plated on similar substrates.

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