Zero to low magnetostriction, high coercivity, polycrystalline,

Details Zero to low magnetostriction, high coercivity, polycrystalline, Zero to low magnetostriction, high coercivity, polycrystalline,

1981-06-30

1984-03-20

Sheehan, John P.

Alloys or metallic compositions

Cobalt base

148 3157, 428606, 428928, 360134, 360135, 360136, C22C 1907

Patent

active

044380666

ABSTRACT:
An alloy of Co.sub.x Pt.sub.y with y between 10 and 30 at. % is made by sputtering with H.sub.c >500 Oe and 4.pi.M.sub.s >5000 gauss, and zero magnetostriction. For 10 to 30 at. % Co the sputtered alloy has an H.sub.c of 500-1000 Oe with 4.pi.M.sub.s of 4000-14000 gauss, a magnetostriction passing through zero between 20 and 30 at. % of Pt. For thickness below 1000.ANG. H.sub.c is large (for the above range of alloys) and magnetization is also larger and coercivity varies as a direct function of Pt composition in the alloy up to 30 at. %.

REFERENCES:
patent: 3755796 (1973-08-01), Griest
patent: 3976436 (1976-08-01), Chang
patent: 4103315 (1978-07-01), Hempstead et al.
Hansen, Constitution of Binary Alloys, 1958, pp. 492-493.

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