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Soft underlayer for perpendicular media with mechanical stability and corrosion resistance

A technology of perpendicular magnetic recording and medium, which is applied in magnetic recording, data recording, recording information storage, etc., and can solve problems such as damage to the chemical stability of PRM

Inactive Publication Date: 2008-05-07
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this scheme improves the overall corrosion characteristics of the PRM stack, the presence of defects or vacancies in the thick overlapping layers compromises the chemical stability of the PRM

Method used

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  • Soft underlayer for perpendicular media with mechanical stability and corrosion resistance
  • Soft underlayer for perpendicular media with mechanical stability and corrosion resistance
  • Soft underlayer for perpendicular media with mechanical stability and corrosion resistance

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Embodiment Construction

[0027] "X alloy" means an alloy of X alone or including X (eg the term CoFe alloy includes CoFe as well as CoFeO and CoFeC). Alloys include at least two elements and do not necessarily include metals.

[0028] "上" means "on", but not necessarily directly "on".

[0029] 3 is a schematic cross-sectional view of a perpendicular magnetic recording disk according to the prior art, showing an antiferromagnetically coupled SUL. The various layers that make up the disk are located on the hard disk substrate. The substrate can be any commercially available glass substrate, but can also be conventional aluminum alloys with NiP or other known surface coatings, or alternative substrates such as silicon, wollastonite or silicon carbide. The SUL is on the substrate, either directly on the substrate or directly on the adhesive layer or OL. The OL promotes the growth of the SUL and may be an AlTi alloy or similar material with a thickness of about 2-5 nanometers (nm). In the disc of FIG. ...

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Abstract

The present invention provides a perpendicular magnetic recording medium. A perpendicular magnetic recording disk has a granular cobalt alloy recording layer (RL) containing on the ''soft'' magnetic underlayer (SUL). The SUL is doped with judiciously chosen elements or alloys or is capped or intercalated with said elements or metal alloy layers. The resulting disk and the SUL in particular has good recording properties, improved mechanical strength and improved corrosion resistance over a comparable disk without the doping or thin layers.

Description

technical field [0001] The present invention relates generally to perpendicular magnetic recording media, and more particularly, to disks having perpendicular magnetic recording layers for magnetic recording hard disk drives. Background technique [0002] Perpendicular magnetic recording is one of the potential ways to achieve ultra-high recording density in magnetic recording hard drives. The bits recorded in perpendicular magnetic recording are stored in the magnetic layer with vertical or out-of-plane orientation of the magnetic axis. A common type of perpendicular magnetic recording system is one that utilizes "double layer" media. Such a system is shown in Figure 1 with a single write pole type recording head. Dual-layer media consists of a perpendicular magnetic data recording layer (RL) formed on a "soft" or low-coercivity magnetic underlayer (SUL), which acts as a magnetic field from the write pole to the return pole of the recording head flux return path. In Fig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/66G11B5/64
CPCG11B5/667
Inventor 戴维·布朗斯坦戴青池田圭宏欧内斯托·马里尼罗王仁汉
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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