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Method for magnetic recording on patterned multilevel perpendicular media

A magnetic recording medium, the technology of magnetic moment direction, which is applied to the recording, recording/reproducing/deleting method, magnetic recording and other directions of information on the magnetic disk, which can solve the problems of low failure rate, no patterned magnetic island, damage to SNR, etc.

Inactive Publication Date: 2005-06-08
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it has been demonstrated to support 300GBit / in 2 manufacturing method, but it is not yet possible to obtain large-area ultra-high-density magnetic patterns with low failure rate and high uniformity
[0004] The use of multilayer magnetic memories has been proposed, as described in US Patent 5,583,727, but only for continuous (unpatterned) magnetic films, and without patterned magnetic islands
However, in a multilayer continuous magnetic film, the number of magnetic grains is divided into multiple layers, so the signal and noise are divided into multiple layers, thus compromising the SNR

Method used

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  • Method for magnetic recording on patterned multilevel perpendicular media
  • Method for magnetic recording on patterned multilevel perpendicular media
  • Method for magnetic recording on patterned multilevel perpendicular media

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Embodiment Construction

[0019] Patterned Multilayer Perpendicular Magnetic Recording Media

[0020] figure 1 is a schematic diagram of the patterned magnetic recording medium of the present invention. The medium includes a substrate 12 , a multilayer perpendicular magnetic recording layer 50 , an optional lower layer 14 and an optional protective overcoat 16 . The recording layer 50 includes a plurality of islands, such as the illustrated islands 52 , 54 , 56 , 58 , separated by gaps 60 . Each island is formed by a first layer of magnetic material 20 having perpendicular magnetic anisotropy, a second layer of magnetic material 40 having perpendicular magnetic anisotropy, and a spacer layer 30 that separates the two magnetic layers in each island. 20, 40 separate and magnetically decoupled. Thus, each island is a multilayer magnetic island having at least two stacked magnetically decoupling cells (eg cells 22, 32 in island 52). Each cell is a single magnetic domain and is separated from other ce...

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Abstract

One method for magnetic recording uses a fixed write current with thermal assistance for recording on patterned specific magnetic recording media. Patterned media have magnetic blocks or islands, each containing a stack of individual magnetic cells to provide multi-layer recording. Each cell in the island is formed from a material or set of materials such that the cell has perpendicular magnetic anisotropy and consists of a single magnetic domain. Each cell is magnetically decoupled from other cells in its island by a non-magnetic separation layer. Thus, each cell can be magnetized (magnetic moment) in one of two directions (into or out of the plane of the layer comprising the cell), and this magnetization is independent of the magnetization of the other cells in its island. Thus, overall magnetization on different cells of each island allows multiple magnetic signal levels or states to be recorded in each magnetic island.

Description

technical field [0001] The present invention relates to magnetic recording media and systems, such as magnetic recording hard disk drives, and more particularly to media and systems having patterned perpendicular magnetic recording media. Background technique [0002] Patterned magnetic recording media have been proposed in order to increase the bit density in magnetically recorded data storage such as hard disk drives. In patterned media, the magnetic material forms smaller isolated blocks or islands such that within each island or "bit" there is a single magnetic domain. The single magnetic domain can be a single grain, or comprise several firmly linked grains that switch magnetic states simultaneously like a single magnet. This differs from traditional continuum media, where a single "bit" can have multiple magnetic domains separated by magnetic domain walls. US Patent 5,820,769 is typical of various patterned media and their methods of manufacture. A description of ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/65G11B5/00G11B5/012G11B5/02G11B5/09G11B5/127G11B5/66G11B5/738G11B5/82G11B5/84G11B5/851H03M1/12
CPCG11B5/012G11B5/09G11B5/743G11B5/855G11B2005/0021G11B5/676H03M1/12
Inventor 曼弗雷德·阿尔布雷克特奥拉夫·赫尔维格胡国菡布鲁斯·D·特里斯
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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