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Aqueous Bath Solution with Beryllium Additive for Magnetic Film Deposition

IP.com Disclosure Number: IPCOM000090851D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Rader, HN: AUTHOR [+2]

Abstract

Uniaxial NiFe magnetic films having a good thermal stability are obtainable using a beryllium ion additive Be/++/ in the electrochemical plating bath solution. An aqueous bath solution suitable for electroless deposition of NiFe on a cylindrical copper substrate comprises Ni/++/ from 6 X 10/-2/ moles - 60 X 10/-2/ moles Fe/++/ from 84 X 10/-5/ to 84 X 10/-3/ and H(2) P0(2) from 1.75 X 10/-2/ moles - 17.5 X 10/-2/ moles.

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Aqueous Bath Solution with Beryllium Additive for Magnetic Film Deposition

Uniaxial NiFe magnetic films having a good thermal stability are obtainable using a beryllium ion additive Be/++/ in the electrochemical plating bath solution. An aqueous bath solution suitable for electroless deposition of NiFe on a cylindrical copper substrate comprises Ni/++/ from 6 X 10/-2/ moles - 60 X 10/-2/ moles

Fe/++/ from 84 X 10/-5/ to 84 X 10/-3/ and H(2) P0(2) from 1.75 X 10/-2/ moles - 17.5 X 10/-2/ moles.

In addition the bath includes a sequestering agent, such as a tartrate or a citrate, ammonium hydroxide of a quantity sufficient to obtain the following ratio Ni/++/ over NH(4)OH .05 - 0.16 resulting in a bath with a pH in the range of 9 - 11.

To the above solution is added a beryllium salt e.g.,

BeSO(4).4H(2)O, in a quantity sufficient to establish the following molar ratios Be/++/ over Fe/++/ .25 - 100

Be/++/ + Fe/++/ over Tartrate (or citrate) radical .05 - 0.5.

If magnetic films having a NiFeCo composition are to be produced, a cobalt ion is added to the solution in a quantity sufficient to obtain a molar ratio of NI/++/ + Co/++/ over NH(4)OH 0.05 - 0.16.

The use of the beryllium ion Be/++/ allows the ferrous ions Fe/++/ to be more completely complexed with either the tartrate or citrate radical or both. Bath instability which otherwise results from formation of non-reducible ferrous ion complex species, i.e., (FeOH)(2)C(4)H(4)O(6) in the case of tartrate, in the soluti...