Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1985-03-04
1987-12-22
Sheehan, John P.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
428611, 428614, 428547, 428552, 428558, 428676, 428686, 428928, B22D 2500
Patent
active
047146419
ABSTRACT:
A ferromagnetic film for magnetic recording comprises a copper substrate having particles of iron and iron oxides dispersed in the surface layer of the copper. The particles have maximum dimensions in the range between 50 and 500 Angstroms. The ferromagnetic film can be formed by ion implantation of iron ions into the copper substrate followed by heat treatment to permit growth of ferromagnetic particles to the desired size. As an alternative to ion implantation, the iron can be deposited on the copper substrate by sputtering or evaporation and mixed with the copper by ion beam mixing.
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K. T. Short et al., "High Resolution RBS and Channeling Analysis of Ion Implanted Single Crystal Fe", Nucl. Instrum. Methods, 191 (1981), pp. 537-542.
D. M. Follstaedt, "Microstructure Evolution in Titanium-Implanted Iron," Thin Solid Films, 63 (1979), p. 39.
Handbook of Physics, Ed. E. Condon et al., 2nd Ed., McGraw-Hill, Part 4, Chap. 8, Sec. 9, pp. 4-139 to 4-141.
Cole Stanley Z.
Dooher Terrence E.
Fisher Gerald M.
Sheehan John P.
Varian Associates Inc.
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