Amorphous Co-Ti alloys

Details Amorphous Co-Ti alloys Amorphous Co-Ti alloys

1979-12-28

1982-04-20

Sheehan, John P.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75123K, 75123M, 75134F, C22C 1900

Patent

active

043257330

ABSTRACT:
An amorphous alloy of cobalt and from about 14 to 30 atomic percent of titanium can be deposited upon a substrate by r.f. sputtering from 10 to 30 percent of titanium. The properties of the amrophous CoTi films are similar to those of transition metal-metalloid glasses in that they have soft magnetic properties (low H.sub.c) and their resistivity is in the 100-200 micro-ohm centimeter range. Unlike most metal-metalloid glasses, these films have very low magnetostriction and they are more stable to thermal annealing. They are more corrosion resistant than permalloy plated films. The films can be employed as magnetic yoke layers in magnetic recording heads or in the bubble propagation structures of bubble domain devices, as substitutes for 80:20 Ni:Fe alloys. The FeCoTi, NiCoTi and FeNiCoTi amorphous alloys have similar characteristics to the CoTi amorphous alloys for Ti concentrations on the order of 14 to 30 atomic percent where the ratio of Co to Fe and or Ni is greater than or equal to about 1 to 1.

REFERENCES:
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patent: 4255189 (1981-03-01), Ray
Ray et al., "The Constitution of Metastable Titanium-Rich Ti-Fe Alloys: An Order-Disorder Transition," Metallurgical Transactions 3, 627-629 (Mar. 1972).
Brunsch, "Magnetic Properties and Corrosion Resistance of (CoFeB).sub.100-x Cr.sub.x Thin Films", Joint Intermag MMM Conference, New York 1979.

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