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Nickel Iron Platinum Thin Films

IP.com Disclosure Number: IPCOM000092169D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Griest, AJ: AUTHOR

Abstract

The use of platinum as an additive to nickel-iron magnetic films provides magnetic films suitable for memory use and having superior stability at elevated temperatures and in adverse magnetic fields. With the addition of platinum, little change occurs in coercive force H(o), anisotropy field H(k), and skew alpha of the magnetic films, even after exposure to temperatures of 65 degrees C in the presence of hard direction magnetic fields of 0.5 H(k) for about 1,700 hours. In contrast, nickel-iron-cobalt magnetic films, aged under the same conditions, show reversible rotation of their easy axes and an increase in skew sufficient to make them inoperative as memory devices. Sputtered magnetic films of about 1,000 angstroms thickness on copper substrates and containing from 66.0 to 66.4 weight per cent nickel, from 15.0 to 15.

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Nickel Iron Platinum Thin Films

The use of platinum as an additive to nickel-iron magnetic films provides magnetic films suitable for memory use and having superior stability at elevated temperatures and in adverse magnetic fields. With the addition of platinum, little change occurs in coercive force H(o), anisotropy field H(k), and skew alpha of the magnetic films, even after exposure to temperatures of 65 degrees C in the presence of hard direction magnetic fields of 0.5 H(k) for about 1,700 hours. In contrast, nickel-iron-cobalt magnetic films, aged under the same conditions, show reversible rotation of their easy axes and an increase in skew sufficient to make them inoperative as memory devices. Sputtered magnetic films of about 1,000 angstroms thickness on copper substrates and containing from 66.0 to
66.4 weight per cent nickel, from 15.0 to 15.3 weight per cent iron, and from 18.6 to 19.1 weight per cent platinum are prepared. For comparison, magnetic films containing 78.5 weight per cent nickel, 18.5 weight per cent iron, and 3.0 weight per cent cobalt of the same thickness on copper substrates are also prepared. Both sets of films have a skew of about 1 degree initially. After exposure to temperatures of 65 degrees C and magnetic fields of 0.5 H(k) for about 1,700 hours in air, the skew of the nickel-iron-platinum films does not rise above 1 degree. The skew of the nickel-iron-cobalt film increases to about 4 degrees. Similar increases in skew are obtain...