Magnetic recording medium

A magnetic recording medium and recording layer technology, applied in magnetic recording, data recording, recording information storage, etc., can solve problems such as easy stacking

Inactive Publication Date: 2019-03-15
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since barium ferrite magnetic particles have a plate-like shape, stacking tends to occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0031] 1 First Embodiment (Example of Magnetic Recording Medium)

no. 2 approach

[0032] 2 Second Embodiment (Example of Magnetic Recording Medium)

no. 3 approach

[0033] 3 Third Embodiment (Example of Magnetic Recording Medium)

[0034]

[0035] [Structure of Magnetic Recording Medium]

[0036] The magnetic recording medium according to the first embodiment of the present technology is a perpendicular magnetic recording medium (perpendicular magnetic recording type magnetic recording medium) configured to be able to record a signal at a shortest recording wavelength of not more than 75 nm. More specifically, it is a perpendicular magnetic recording medium used in a recording / reproducing device whose shortest recording wavelength is not more than 75 nm. The recording / reproducing apparatus described above includes a ring head as the recording head, and records signals in the magnetic recording medium at a shortest recording wavelength of not more than 75 nm by the ring head. In addition, the magnetic recording medium has an elongated shape, and travels in the longitudinal direction at the time of recording / reproducing.

[0037] Such a...

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PUM

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Abstract

A magnetic recording medium is adopted in a recording and reproduction device that has the shortest recorded wavelength of 75 nm or less, the magnetic recording medium including a recording layer thatcontains a particle powder containing epsilon-iron oxide. A squareness ratio measured along the travel direction of the magnetic recording medium is 30% or less; a ratio (Dmax / Dmin) of the averagelongest diameter Dmax of particles to the average shortest diameter Dmin satisfies a relationship of 1.0 <= (Dmax / Dmin) <= 1.1; the average thickness [delta]mag of the recording layer is 100 nm or less; and a ratio ([delta]mag / Dmin) of the average thickness [delta]mag of the recording layer to the average shortest diameter Dmin of particles satisfies a relationship of [delta]mag / Dmin <= 5.

Description

technical field [0001] This technology relates to magnetic recording media. Background technique [0002] For high recording density, it is effective to perform perpendicular recording by using a component perpendicular to the recording layer of the magnetic field generated from the recording head. In order to perform perpendicular recording, it is important to increase the degree of perpendicular orientation of the magnetic powder (ie, decrease the degree of longitudinal orientation). Furthermore, in the case of a magnetic tape, it is difficult to use a single pole head such as a hard disk medium as a recording head, and it is highly likely that a ring head of an existing format will also be used in the future. [0003] As the magnetic powder of the perpendicular magnetic recording type magnetic recording medium (hereinafter, referred to as "perpendicular magnetic recording medium"), barium ferrite magnetic powder is used. However, since barium ferrite magnetic particles ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/706G11B5/712G11B5/714
CPCG11B5/712G11B5/714G11B5/70642G11B5/70G11B5/70605
Inventor 寺川润印牧洋一山鹿実
Owner SONY CORP
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