Patent ID: 6868048

Claim:
A data storage system, comprising: a source of heat; a substrate; a write layer disposed above the substrate; a copy layer disposed above the write layer; and a flying head disposed above the layers and carrying the source of heat for heating a selected spot on the copy and write layers, wherein the write layer comprises a ferromagnetic material selected to have a high coercivity at room temperature and a very high write temperature T write and the copy layer comprises a ferromagnetic material selected to have a coercivity always less than the coercivity of the write layer at the same temperature and a copy temperature T copy , substantially less than the write temperature of the write layer; wherein the copy layer is deposited over the write layer by the steps of depositing first the write layer of TbFeCo, and then depositing a copy layer of Co/Pt, and wherein the step of depositing the Co/Pt comprises depositing 0.3 nm Co/1.0 nm Pt repeated 13 times.