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Improving the Quality of Aqueously Anodized Gd Co Films

IP.com Disclosure Number: IPCOM000081551D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gambino, RJ: AUTHOR [+2]

Abstract

To achieve consistent long-term magnetic performance, films of Gd-Co should be covered by a protective layer which is both transparent and a good electrical insulator. The process should be simple and inexpensive.

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Improving the Quality of Aqueously Anodized Gd Co Films

To achieve consistent long-term magnetic performance, films of Gd-Co should be covered by a protective layer which is both transparent and a good electrical insulator. The process should be simple and inexpensive.

Good results have been achieved on Gd(15)Co(75)Mo(10) ternary alloy films by a method of aqueous anodization. The films were anodized by applying a positive two volt potential, while immersed in a bath containing 0.5% H(3)PO(4) and water.

The counter electrode was platinum. Anodization times were in the order of minutes. Current voltage curves across both electrodes showed a marked decrease in resistance above three volts, after which anodization ceased and etching began. However, applied potentials up to two volts resulted in transparent anodic films with breakdown potentials in the order of 30 to 40 volts. Films that did not contain molybdenum, with identical Gd to Co ratios, anodized poorly or not at all under the same conditions. The resulting anodic films were nonuniform and opaque with breakdown voltages that did not exceed two volts.

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