| 摘要 |
1,136,493. Magnetic structures. SOC. INDUSTRIELLE BULL-GENERAL ELECTRIC. 31 March, 1966 [2 April, 1965], No. 14411/66. Heading H1H. [Also in Division C7] A magnetic structure comprises a non- magnetic support, a first ferromagnetic alloy layer having a composition which varies in the direction of thickness, about a mean value corresponding to zero magnetostriction, an intermediate non-magnetic conductive layer, and a second ferromagnetic layer of the same alloy, having a constant composition and zero magnetostriction. The three layers are preferably deposited electrolytically on a metal support serving as cathode. The first layer has a higher coercive force than the second, and may have a continuously varying composition (prepared using an electrolyte containing cinchonine) or may comprise two layers each of constant composition on either side of the mean (prepared as described in Specification 1,136,491). The second layer may be prepared as described in Specification 1,136,492 using an electrolyte containing thiourea. The alloy may be 82-83% Ni, 18-17% Fe, and the conductive layer may be of Au, Cr, Pd, Pt, Mn, In, or Al. The layers may be, resp., 800-900 Š, >500 Š, and 200 Š thick. The structure is used as a magnetic memory for non-destructive reading. |
