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Granular thin film, perpendicular magnetic recording medium employing granular thin film and magnetic recording apparatus

A technology of perpendicular magnetic recording and particles, which is applied in the direction of magnetic recording, magnetic recording layer, ultra-thin film/granular film, etc., can solve the problems that are not suitable for obtaining vertical particle orientation, and achieve the effect of reducing the magnetic spacing

Inactive Publication Date: 2005-09-28
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However due to Hf, Ru, Ti Ta, Nb, Cr, Mo, W, C, Si 3 o 4 , Al 2 o 3 , Cr 2 o 3 , SiO 2 and NiP are expected as the underlying layer for this disclosure, the disclosed layered structure is not suitable for obtaining vertical grain orientation, grain size distribution suppression and ordered grain arrangement

Method used

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  • Granular thin film, perpendicular magnetic recording medium employing granular thin film and magnetic recording apparatus
  • Granular thin film, perpendicular magnetic recording medium employing granular thin film and magnetic recording apparatus
  • Granular thin film, perpendicular magnetic recording medium employing granular thin film and magnetic recording apparatus

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Embodiment 1

[0032] Example 1 (Substrate)

[0033] The substrates that can be used in the present invention include glass, Al alloys, ceramics, carbon, silicon single crystals with an oxide surface, and silicon single crystals with Ni-P plating.

[0034] The glass substrate includes amorphous glass and crystalline glass. Amorphous glass includes soda lime glass or aluminosilicate glass. The crystal glass includes lithium crystal glass. The ceramic substrate includes, for example, commonly used sintered ceramic substrates of alumina, aluminum nitride, and silicon nitride, and fiber-reinforced ceramic substrates of these ceramics.

[0035] It is desirable to use a substrate having a Ni-P layer formed by sputtering or electroplating on its surface.

Embodiment 2

[0036] Example 2 (soft magnetic layer)

[0037] By arranging the soft magnetic layer 22 of high permeability as the bottom layer of the perpendicular magnetic recording layer, a perpendicular double-layered medium is formed. In a vertical double-layer recording medium, the function of the high permeability soft magnetic layer is to improve the recording and reproduction efficiency of the recording head, which forms a horizontal loop of magnetic flux generated by, for example, a unipolar magnetic recording head.

[0038] A material containing Fe, Ni, or Co can be used as the soft magnetic layer 22. The soft magnetic layer contains, for example, FeCo alloys containing FeCo and FeCoV, FeNi alloys containing FeNi, FeNiMo, FeNiCr and FeNiSi, FeAl and FeSi alloys containing FeAl, FeAlSi, FeAlSiCr, FeAlSiTiRu and FeAlO, and FeTa alloys containing FeTa, FeTaC and FeTaN , And FeZr alloy containing FeZrN.

[0039] FeAlO, FeMnO, FeTaN, and FeZrN thin films having a fine grain structure or a ...

Embodiment 3

[0047] Embodiment 3 (perpendicular magnetic recording layer)

[0048] A material composition having Co as a main component, Pt as an essential component and an oxide material as an additional component is suitable for the perpendicular magnetic recording layer 25. Silicon oxide or titanium oxide is suitable for oxide materials.

[0049] In the perpendicular magnetic recording layer 25, it is desirable that the magnetic particles 27, that is, crystal particles having magnetization, exist in a dispersed state. In addition, it is desirable that the magnetic particles 27 in the layer form a columnar structure that passes through the perpendicular magnetic recording layer 25 from the bottom end of the layer to the top end of the layer. The formation of the columnar structure means good grain orientation and good grain crystallinity, and results in an excellent medium signal-to-noise ratio suitable for achieving high recording density.

[0050] In order to obtain the columnar structure,...

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Abstract

A perpendicular magnetic recording medium suitable for attaining a low noise high magnetic recording density is obtained. The medium has a small average magnetic grain diameter, a small magnetic grain diameter distribution, a high perpendicular crystallographic magnetic grain orientation and a high regularity magnetic grain arrangement. The perpendicular magnetic recording medium comprises a soft magnetic layer, a granular under-layer and a perpendicular magnetic recording layer on a substrate. The granular under-layer is formed on a metal under-layer. The metal grains in the granular layer are separated by nonmagnetic inter-grain material and are partially penetrated into the metal under-layer. The perpendicular magnetic recording layer is formed on the granular layer. Then a perpendicular magnetic recording medium shows high signal to noise ratio and excellent high-density recording characteristics.

Description

[0001] Cross reference to related patent applications [0002] This application is based on the prior Japanese patent application 2004-90671 filed on March 25, 2004, and claims priority according to the patent application; the entire content of the patent application is cited here. Technical field [0003] The present invention relates to a granular film, a perpendicular magnetic recording medium having a granular layer, and a magnetic recording and reproducing device using the perpendicular magnetic recording medium. Background technique [0004] The hard disk drive (HDD) has become the main recording device in various fields due to its low cost, high data access speed and high reliability in data storage. These fields include home video systems, audio devices, and car navigation systems. It is not limited to common application areas such as computer memory. With the expansion of the HDD application field, the demand for HDDs with larger recording capacity continues to increase. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/667B32B5/16G11B5/64G11B5/65G11B5/66G11B5/73G11B5/738G11B5/84H01F10/00
CPCG11B5/656G11B5/667B82Y25/00H01F10/007G11B5/7325Y10T428/25G11B5/737G11B5/658
Inventor 及川壮一岩崎刚之前田知幸喜喜津哲
Owner KK TOSHIBA