Patent ID: 9251831
Filing Date: 2016-02-02
CPC Classification: G11B

Claim Text:
1. A recording medium comprising: a servo layer configured to have a nucleation field value, wherein the servo layer is a magnetic layer; a data recording layer configured to have a saturation field value, wherein the nucleation field value of the servo layer is greater than or equal to 80% of the saturation field value of the data recording layer, and wherein the data recording layer is a magnetic layer; a first intermediate layer disposed on the servo layer, wherein the data recording layer is disposed on the first intermediate layer; a second intermediate layer, wherein the servo layer is disposed on the second intermediate layer; a crystalline underlayer comprising a first side and a second side, wherein the second side opposes the first side, and wherein the second intermediate layer is disposed on the first side of the crystalline underlayer; and an amorphous underlayer disposed on the second side of the crystalline underlayer, wherein the crystalline underlayer or the amorphous underlayer is a magnetic layer.