Patent ID: 6682834
Filing Date: 2004-01-27
Classification: G11B

Abstract:
A magnetic storage medium for longitudinal magnetic recording, comprising:a non-magnetic substrate; an under layer provided on said non-magnetic substrate; and a first magnetic layer provided above said under layer, said first magnetic layer comprising a Co alloy layer of a system Coâ€”Cr&bgr;â€”Pt&ggr;â€”B&dgr;â€”Cu&egr;, said Co alloy layer having a thickness t and a remnant magnetic flux density Br satisfying a relationship for a product (tÃ—Br) as 2.0 nTÂ·m&lE;(tÃ—Br)&lE;7.0 nTÂ·m, said Co alloy layer containing, in addition to Co, Cr with a concentration &bgr; of 20-26 at % (20 at % &lE;&bgr;&lE;26 at %), Pt with a concentration &ggr; of 6-20 at % (6 at % &lE;&ggr;&lE;20 at %), B with a concentration &dgr; of 1-7 at % (1 at % &lE;&dgr;&lE;7 at %), and Cu with a concentration &egr; of 2-7 at % (2 at %&lE;&egr;&lE;7 at %), said magnetic storage medium including an additional magnetic layer directly adjacent to said first magnetic layer, said additional magnetic layer comprising an alloy of any of a system of Coâ€”Crâ€”Ptâ€”Bâ€”Cu or a system of Coâ€”Crâ€”Ptâ€”B.