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Method to improve coercivity radial profile in magnetic recording media and product thereof
| Details |
Inventors: Ji, Xiongwei; Shi, Jianzhong; Ng, Darren Soonkeong; Ling, Kakeng; Ng, Huitong; Koh, Chinsoon; Cheng, Yuanda Randy; Sawaski, Steven Hiyoshi;
Assignee: Seagate Technology LLC (Scotts Valley, CA)
Primary Examiner: Bernatz; Kevin M.
Assistant Examiner:
Attorney, Agent or Firm: Morrison & Foerster LLP
A novel method of manufacturing a novel recording media is disclosed. The manufacturing method includes obtaining a substrate having an inside diameter and an outside diameter and creating a radial profile of an intensive property, such as Hc, of a multilayer magnetic layer containing at least a first magnetic layer and a second magnetic layer deposited on the substrate, from the inside diameter to the outside diameter by forming a radial profile of an extensive property, such as MrT or T, of either the first magnetic layer or the second magnetic layer from the inside diameter to the outside diameter. |
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DETAILED DESCRIPTION This invention preferably relates a magnetic recording disk medium comprising a substrate and a multilayer magnetic layer, preferably dual layers, wherein the Hc radial profile of the dual magnetic layers is substantially uniform.
Such a Hc radial profile of the dual magnetic layers could be obtained by adjusting the MrT ratio of the magnetic recording layers at different diameters of the disk medium.
One embodiment is a recording disk medium comprising a substrate with an inside diameter and an outside diameter and a multilayer magnetic layer comprising at least a first magnetic layer and a second magnetic layer deposited on the substrate, wherein the variation in MrT, a product of remnant magnetization (Mr) and thickness (T), of the multilayer magnetic layer from the inside diameter to the outside diameter is less than the variation in MrT of either the first magnetic layer or the second magnetic layer from the inside diameter to the outside diameter, and further wherein a coercivity (Hc) of the multilayer magnetic layer from the inside diameter to the outside diameter is substantially constant, wherein the variation in the Hc of the multilayer magnetic layer from the inside diameter to the outside diameter is less than 10% or wherein the variation in the MrT of the multilayer magnetic layer from the inside diameter to the outside diameter is less than 10%.
Preferably, the variation in the MrT of the multilayer magnetic layer from the inside diameter to the outside diameter is less than the variation in the MrT of the first magnetic layer from the inside diameter to the outside diameter and the variation in the MrT of the multilayer magnetic layer from the inside diameter to the outside diameter is less than the variation in the MrT of the second magnetic layer from the inside diameter to the outside diameter.
More preferably, the variation in the Hc of the multilayer magnetic layer from the inside diameter to the outside diameter is less than 7% and the variation in the MrT of the multilayer magnetic layer from the inside diameter to the outside diameter is less than 5%
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