Patent ID: 9659592
Date: 2017-05-23
CPC Classifications: G11B

Claim:
1. A perpendicular magnetic recording medium comprising: a nonmagnetic substrate; a first nonmagnetic intermediate layer above the nonmagnetic substrate; a second nonmagnetic intermediate layer on the first nonmagnetic intermediate layer; and a magnetic recording layer on the second nonmagnetic intermediate layer; wherein the first nonmagnetic intermediate layer is formed from a CoCrRuW alloy, and the second nonmagnetic intermediate layer is formed from an Ru-base alloy; and wherein the CoCrRuW alloy has a Cr content of 14.5 at % or higher and 25.5 at % or lower, a Ru content of 4.5 at % or higher and 20.5 at % or lower, and a W content of 4.5 at % or higher and 8.5 at % or lower, and wherein a remainder of the CoCrRuW alloy is Co.