Magnetic recording medium fabrication method and apparatus

Patent metadata

Field	Value
Publication number	US-9646643-B2
Application number	US-201414171937-A
Country	US
Kind code	B2
Filing date	Feb 4, 2014
Priority date	Feb 25, 2013
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

A method of fabricating a magnetic recording medium sequentially forms a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body. The lubricant layer is formed on a surface of the protection layer by vapor-phase lubrication without exposing the stacked body to atmosphere after forming the protection layer on the stacked body. Nitrogen atoms or oxygen atoms are injected onto the surface of the protection layer after forming the protection layer and before forming the lubricant layer.

First claim

What is claimed is:

1. A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, comprising:
forming the lubricant layer of a lubricant on a surface of the protection layer by vapor-phase lubrication, that introduces vapor of a high molecular compound of the lubricant, without exposing the stacked body to atmosphere after forming the protection layer on the stacked body; and
injecting nitrogen atoms or oxygen atoms onto the surface of the protection layer after forming the protection layer and before forming the lubricant layer,
wherein the injecting controls a bonded ratio between the protection layer and the lubricant layer to a value, within a range of 60% to 99%, that is lower than a bonded ratio for a case in which the nitrogen atoms or the oxygen atoms are not injected onto the surface of the protection layer after forming the protection layer and before forming the lubricant layer.

2. A method of fabricating a magnetic recording medium by sequentially forming a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body, comprising:
forming the lubricant layer of a lubricant on a surface of the protection layer by vapor-phase lubrication, that introduces vapor of a high molecular compound of the lubricant, without exposing the stacked body to atmosphere after forming the protection layer on the stacked body; and
performing nitriding or oxidation of the surface of the protection layer after forming the protection layer and before forming the lubricant layer,
wherein the performing the nitriding or oxidation controls a bonded ratio between the protection layer and the lubricant layer to a value, within a range of 60% to 99%, that is lower than a bonded ratio for a case in which the nitriding or the oxidation is not performed on the surface of the protection layer after forming the protection layer and before forming the lubricant layer.

3. The method of fabricating the magnetic recording medium as claimed in claim 2 , wherein the performing the nitriding or oxidation introduces nitrogen gas or oxygen gas into a reaction chamber at a latter stage of a deposition process that forms the protection layer, to perform the nitriding or the oxidation on the surface of the protection layer after the protection layer is formed by the deposition process.

4. The method of fabricating the magnetic recording medium as claimed in claim 1 , further comprising:
providing a region having a gas pressure P 3 in a transport path of the stacked body after the formation of the protection layer and before the formation of the lubricant layer, satisfying relationships P 3 >P 1 and P 3 >P 2 , where P 1 denotes a process gas pressure at a time of forming the protection layer, and P 2 denotes a process gas pressure at a time of forming the lubricant layer,
wherein a difference between the gas pressure P 3 and the process gas pressure P 1 is 150 Pa or less, and a difference between the gas pressure P 3 and the process gas pressure P 2 is 150 Pa or less.

5. The method of fabricating the magnetic recording medium as claimed in claim 2 , further comprising:
providing a region having a gas pressure P 3 in a transport path of the stacked body after the formation of the protection layer and before the formation of the lubricant layer, satisfying relationships P 3 >P 1 and P 3 >P 2 , where P 1 denotes a process gas pressure at a time of forming the protection layer, and P 2 denotes a process gas pressure at a time of forming the lubricant layer,
wherein a difference between the gas pressure P 3 and the process gas pressure P 1 is 150 Pa or less, and a difference between the gas pressure P 3 and the process gas pressure P 2 is 150 Pa or less.

Assignees

• Showa Denko Kk

Inventors

• Ota Ichiro

Classifications

• G11B5/8408 Primary

  protecting the magnetic layer · CPC title

• H01F41/308

  lift-off processes, e.g. ion milling, for trimming or patterning · CPC title