Patent ID: 7435489
Filing Date: 2008-10-14
Classification: G11B,Y10T

Abstract:
1. A magnetic recording medium comprising: an exchange layer structure; and a magnetic layer provided on the exchange layer structure, said exchange layer structure comprising a ferromagnetic layer and a nonmagnetic coupling layer provided on the ferromagnetic layer, said ferromagnetic layer and said magnetic layer being exchange-coupled and having mutually antiparallel magnetizations, said ferromagnetic layer and said magnetic layer satisfying a relationship Hc each of the dynamic coercivities Hc said ferromagnetic layer and said magnetic layer satisfying a relationship Hc each of the static coercivities Hc each of the ferromagnetic layer and the magnetic layer is made of a material selected from a group consisting of CoCrPt and CoCrPt-M alloy, where M is an element or alloy thereof selected from a group consisting of B, Mo, Nb, Ta, W and Cu, and a Pt content of the magnetic layer in atomic % is less than a Pt content of the ferromagnetic layer in atomic %, and said ferromagnetic layer has a thickness in a range of 1 nm to 10 nm.