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Perpendicular magnetic recording disk with improved recording layer having high oxygen content

A technology of perpendicular magnetic recording and recording layer, which is applied in magnetic recording, data recording, recording information storage, etc., and can solve the problem of unavailable RL

Inactive Publication Date: 2009-03-11
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At 21at.% oxygen level, H c drops to about 1000Oe, which makes RL unusable

Method used

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  • Perpendicular magnetic recording disk with improved recording layer having high oxygen content
  • Perpendicular magnetic recording disk with improved recording layer having high oxygen content
  • Perpendicular magnetic recording disk with improved recording layer having high oxygen content

Examples

Experimental program
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Effect test

Embodiment Construction

[0017] A perpendicular magnetic recording disk according to the present invention is shown in Figure 4 . The structure is similar to figure 2 The prior art structure, except for the RL components.

[0018] refer to Figure 4 , the layers that make up the disk are located on the hard disk substrate. The substrate may be any commercially available glass substrate, but may also be a traditional aluminum alloy with NiP or other known surface coating, 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 20 to 50 Angstroms. SUL is a stacked or multilayer SUL formed of multiple soft magnetic layers (SULa and SULb) that act as antiferromagnetic (AF) coupling films between SULa and SULb to perform antiferromagnetic exchange Interlayer films (such a...

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PUM

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Abstract

The present invention provides a perpendicular magnetic recording disk having an improved recording layer of a granular CoPtCr based ferromagnetic alloy with an intergranular material consisting of one or more oxides of Cr and Si, Ta, Ti, B , Nb, or Hf segregants of one or more oxides, wherein the amount of oxygen present in the recording layer is greater than about 22 atomic percent and less than about 35 atomic percent. The amount of oxygen in the recording layer is significantly greater than that required for the stoichiometric oxide or oxides of the segregants, the major part of the oxygen present in the recording layer being present in the intergranular material. The recording layer exhibits a high signal-to-noise ratio (SNR), a coercivity H greater than about 5000 Oe c and a nucleation field H larger (more negative) about -1500 Oe n .

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 use in magnetic recording hard disk drives. Background technique [0002] Perpendicular magnetic recording is one of the approaches to achieve ultra-high recording densities in magnetic recording hard disk drives, where the recorded bits are oriented perpendicularly or out-of-plane in the recording layer. The most common type of perpendicular magnetic recording system is a system utilizing a recording head with a single write pole and a "dual layer" medium, as shown in FIG. 1 . Dual layer media includes a perpendicular magnetic data recording layer (RL) formed on a "soft" or lower coercivity permeable underlayer (SUL). The SUL acts as a flux return path from the field from the write pole to the return pole of the recording head. This type of system is also known as "Type 1" perpendicular ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/62
CPCG11B5/732G11B5/656G11B5/65G11B5/667G11B5/66G11B5/7379G11B5/676G11B5/658
Inventor 霍亚·V·多伯恩德·海因茨池田圭宏高野贤太郎肖敏
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV