Coating processes – Magnetic base or coating – Magnetic coating
Patent
1997-06-10
1998-08-11
Pianalto, Bernard
Coating processes
Magnetic base or coating
Magnetic coating
204554, 427131, 427132, 4273743, 427377, 427380, 4273831, 427399, 427404, B05D 512
Patent
active
057925100
ABSTRACT:
A method for forming a chemically-ordered ferromagnetic or antiferromagnetic metal alloy film allows the temperature and/or time required for annealing to be reduced. The ferromagnetic or antiferromagnetic metal alloy film is dosed with hydrogen either during or subsequent to deposition of the film on a substrate. The metal alloy film is then heated to desorb the hydrogen atoms from the metal alloy. In one embodiment for dosing the metal alloy film with hydrogen a transition metal of the type that catalyzes the dissociative chemisorption of H.sub.2, such as palladium (Pd), is deposited as a film in contact with the metal alloy film. The Pd film is then heated and while at an elevated temperature, it is exposed to H.sub.2 gas. The H.sub.2 becomes dissociated into hydrogen atoms and the hydrogen atoms become chemically absorbed by the Pd film. During subsequent cooling of the Pd film hydrogen atoms in the Pd film become absorbed into the metal alloy film. When the metal alloy film is annealed the hydrogen atoms become desorbed.
REFERENCES:
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M. Alguero et al., "In Situ Measurement of the Rate of H Absorption by a Pd Cathode During the Electrolysis of Aqueous Solutions", Review of Scientific Instruments, vol. 68, No. 2, Feb. 1997, pp. 1324-1330.
V. F. Degtyareva et al., "Distortions of the F.C.C. Crystal Lattice of Pd.sub.60 Cu.sub.40 Alloy Hydrogenated Under High Pressure", Solid State Physics, vol. 66(a), 1981, pp. 77-86. (No month avail.).
T. B. Flanagan et al., "A Possible Role for Hydrogen-induced Lattice Migration in Alloy Materials Processing", Journal of Alloys and Compounds, vol. 231, 1995, pp. 1-9. (No month avail.).
T. Linn et al., "Improved Exchange Coupling Between Ferromagnetic Ni-Fe and Antiferromagnetic Ni-Mn-based Films", Applied Physics Letters, vol. 65, No. 9, Aug. 29, 1994, pp. 1183-1185.
Farrow Robin Frederick Charles
Marks Ronald Franklin
Berthold Thomas R.
International Business Machines - Corporation
Pianalto Bernard
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