Patent ID: 7824785
Filing Date: 2010-11-02
Classification: G11B

Abstract:
1. A perpendicular magnetic recording medium comprising: a nonmagnetic seed layer; a nonmagnetic intermediate layer provided on the nonmagnetic seed layer; and a perpendicular recording layer provided on the nonmagnetic intermediate layer, wherein the nonmagnetic seed layer includes a first seed layer made of a NiW alloy having a fcc structure, and a second seed layer provided between the first seed layer and the nonmagnetic intermediate layer and made of a NiWNb alloy having a fcc structure, and a content of one or more elements other than Ni within the NiWNb alloy forming the second seed layer and having a Goldschmidt radius greater than that of Ni is larger than a content of one or more elements other than Ni within the NiW alloy forming the first seed layer and having a Goldschmidt radius greater than that of Ni.