Magnetic recording medium
AssigneeVictor Company of Japan, Ltd.
InventorsShigeo Shimizu, Toshio Kato, Hitoshi Oda, Masanobu Shigeta
Life of this patent
Estimating the term…
Abstract
A magnetic recording medium comprising a support, a first layer formed on the support by evaporating cobalt or its alloy by an oblique-incidence vacuum evaporation technique, and a second plated layer made of cobalt or its alloy and formed by a wet plating. The cobalt alloy for the first layer substantially consists of, aside from cobalt, up to 30 wt % of Ni, Fe, Cu, W, Cr, Ru or a mixture thereof. On the other hand, the cobalt alloy for the second layer substantially consists of up to 40 wt % of Ni, up to 8 wt % of P and the balance of Co.
Claims11
A magnetic recording medium comprising a support, a first layer having a thickness of 5 to 5000 .ANG. and made of cobalt or a cobalt alloy containing up to 30 wt % of at least one member selected from the group consisting of Ni, Fe, Cu, W, Cr, and Ru and the balance of cobalt, said first layer being formed on one surface of said support by an oblique-incidence vacuum evaportaion, and a second layer having a thickness of 200 to 25,000 .ANG. and made of cobalt or a cobalt alloy containing up to 40 wt % of Ni and up to 8 wt % of P, said second layer being formed on said first layer by eletroplating or electroless plating.
Dependencies are inferred from the claim text.