Patent ID: 6472049
Filing Date: 2002-10-29
Classification: C23C,G11B,Y02T,Y10S,Y10T

Abstract:
A magnetic recording medium, comprising:a non-magnetic substrate; a sputter deposited buffer layer, having a thickness of about 50 Ã¥ to about 300 Ã¥, on the non-magnetic substrate; a sputtered metallic bump layer, comprising a plurality of protrusions, formed on the buffer layer; a composite underlayer comprising a first layer of chromium or a chromium alloy on the bump layer; an intermediate layer comprising nickel-aluminum on the first layer; a third layer comprising chromium or a chromium alloy on the intermediate layer; and a magnetic layer formed on the underlayer, wherein the magnetic recording medium exhibits a coercivity greater than 2500 Oersteads.