Patent ID: 9142241
Filing Date: 2015-09-22
Classification: G11B

Abstract:
1. A method of manufacturing a perpendicular magnetic recording medium, the method comprising: forming a soft magnetic layer on a substrate; forming a first non-magnetic layer of amorphous Ni compound on the soft magnetic layer without a bias voltage applied to the substrate, the first non-magnetic layer consisting of 40 atomic % to 60 atomic % of Ni and 40 to 60 atomic % of one or more elements selected from the group consisting of Ta, Ti, Hf, Re, Os, Ir, Mo, Nb, Zr and V; forming a second non-magnetic layer of crystalline Ni compound on the first non-magnetic layer with a bias voltage applied to the substrate, such that the first non-magnetic layer is disposed between the soft magnetic layer and the second non-magnetic layer, the second non-magnetic layer consisting of 92 to 97 atomic % of Ni and 3-8 atomic % of one or more elements selected from the group consisting of W, Cr, Mo, Re, Al, Cu and Mn; forming an underlayer of Ru or Ru compound on the second non-magnetic layer; and forming a magnetic recording layer above the underlayer, that records a signal.