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Perpendicular magnetic recording medium

A technology for perpendicular magnetic recording and media, applied in the directions of magnetic recording, magnetic recording layer, data recording, etc., which can solve the problems of high production cost, difficulty in batch production, and long time.

Inactive Publication Date: 2006-12-27
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inserting a soft magnetic underlayer between the substrate and the recording layer is very effective for perpendicular magnetic recording media, but in order to exert the effect of the soft magnetic underlayer, a film thickness of 200nm to 400nm is required. If it is used in the formation of each layer of the existing magnetic recording medium The sputtering method used in the present invention forms a soft magnetic primer layer, but it takes a very long time, the production cost is too high, and it is difficult to mass-produce.

Method used

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Embodiment Construction

[0017] figure 1 It is a cross-sectional structure diagram showing a perpendicular magnetic recording medium 2 according to an embodiment of the present invention. On a 2.5-inch glass disc substrate 4, a Ta bonding layer 6 with a thickness of 1 nm is formed by sputtering. The NiFe underlayer 8 was formed to a thickness of 50 nm by sputtering. The base layer is not limited to NiFe. Preferably, base layer 8 is formed of an alloy of elements selected from Co, Ni, Fe. More preferably, base layer 8 is made from Ni 80 Fe 20 、Ni 50 Fe 50 , FeC, FeAlSi, CoZrNb, CoTaZr selected alloy formation. The film thickness of the base layer is preferably 10 nm to 100 nm, more preferably 30 nm to 70 nm.

[0018] On the NiFe base layer 8, a CoNiFeB soft magnetic primer layer 10 with a thickness of 300 nm was formed by electroless plating. The soft magnetic primer layer 10 has an easy axis of magnetization in the in-plane direction of the substrate 4 . Since the electroless plating method i...

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Abstract

A perpendicular magnetic recording medium comprises a substrate, a metal underlying layer formed on the substrate, a soft magnetic layer formed on the metal underlying layer by electroless plating and having an easy axis of magnetization parallel to the substrate, and a magnetic recording layer formed on the soft magnetic layer and having an easy axis of magnetization perpendicular to the substrate. The metal underlying layer is made of an alloy of elements selected from the group consisting of Co, Ni, and Fe an dhas a coercive force of 3 oersteds or less. The soft magnetic backing layer has a thickness of 100 to 600 nm.

Description

technical field [0001] The present invention relates to a perpendicular magnetic recording medium having a perpendicular magnetization film as a recording film. Background technique [0002] In recent years, along with the increase in size and capacity of magnetic disk devices, there has been an increasing demand for miniaturization of magnetic particles in media. However, in the conventional recording method called in-plane (longitudinal) recording method, thermal instability One reason is that it is difficult to remarkably miniaturize magnetic particles. For this reason, a perpendicular magnetic recording system having excellent characteristics in thermomagnetic relaxation and the like has been studied. Generally, in the perpendicular magnetic recording method, a two-layer film medium is used in which a soft magnetic underlayer (underlayer) is laminated on a substrate, and a perpendicular magnetization film is laminated on the soft magnetic underlayer with a non-magnetize...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/738G11B5/667G11B5/65G11B5/73
CPCG11B5/667G11B5/7325Y10T428/265G11B5/736G11B5/7363G11B5/62
Inventor 清水早苗城后新涡卷拓也田中厚志
Owner FUJITSU LTD
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