Vertical magnetic recording medium

A perpendicular magnetic recording and perpendicular magnetic technology, applied in the direction of magnetic recording, magnetic recording layer, data recording, etc., can solve problems such as transmission noise enhancement and reduction of signal-to-noise ratio.

Inactive Publication Date: 2005-09-28
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

Therefore, the magnetic field detected by the read head 37 leaks from the surface of the soft lower layer 13, so the magnetic field acts as a noise source and reduces the signal-to-noise ratio
[0014] In addition, when an unstable domain wall exists in the soft underlayer 13, the domain wall interacts with the bit transfer region recorded on the recording layer 17, resulting in enhancement of transmission noise, which is one of the noises generated by the recording layer 17

Method used

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  • Vertical magnetic recording medium
  • Vertical magnetic recording medium
  • Vertical magnetic recording medium

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[0042] Referring to FIG. 3 , the perpendicular magnetic recording medium 50 includes a perpendicular magnetic recording layer 57 formed on a substrate 51 , and a soft underlayer 53 formed between the substrate 51 and the perpendicular magnetic recording layer 57 . Furthermore, according to the first embodiment of the present invention, the perpendicular magnetic recording medium 50 may further include a vertical alignment lower layer 55 between the soft lower layer 53 and the perpendicular magnetic recording layer 57 . A protective layer 59 for protecting the perpendicular magnetic recording layer 57 from the outside may be formed on the perpendicular magnetic recording layer 57 . In addition, it is possible to further form on the protective layer 59 for reducing figure 2 The head 30 wears a lubricating layer (not shown) and passes through with the figure 2 The magnetic head 30 is connected to produce a protective layer 59 .

[0043] Information is recorded onto the perpen...

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Abstract

A perpendicular magnetic recording medium having a perpendicular magnetic recording layer provided on a substrate and a soft underlayer formed between the substrate and the perpendicular magnetic recording layer. The soft underlayer includes a plurality of soft underlayers having different saturation magnetizations so as to improve signal-to-noise ratio, and at least one of the soft underlayers has a magnetization easy axis in a radial direction so as to improve transition noise.

Description

technical field [0001] The present invention relates to a perpendicular magnetic recording medium, and more particularly, to a perpendicular magnetic recording medium for improving a signal-to-noise ratio (SNR). Background technique [0002] Hard disk drives (HDDs), which are typical magnetic information storage media and have brought about a rapid increase in recording density, currently employ a longitudinal magnetic recording method, including a ring-shaped magnetic head and a longitudinal magnetic recording medium. However, conventional longitudinal magnetic recording methods have encountered limitations in increasing recording density due to thermal instability of recording media, and a new magnetic recording method, a perpendicular magnetic recording method, is currently being actively developed. [0003] The recording density of current longitudinal magnetic recording type HDD products is about 90-100Gb / in 2 . It is hoped that the recording density of the perpendicu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/667G11B5/64G11B5/65G11B5/73
CPCG11B5/656G11B5/667G11B5/653Y10T428/265
Inventor 吴薰翔李丙圭李炅珍洪寿烈
Owner SAMSUNG ELECTRONICS CO LTD
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