Perpendicular magnetic recording medium, production process thereof, and perpendicular magnetic recording and reproducing apparatus

A perpendicular magnetic recording and perpendicular magnetic technology, applied in the direction of magnetic recording, magnetic recording layer, data recording, etc., can solve the problems of unstable recording magnetization, demagnetization and recording data loss, peak noise, etc., to achieve high-density recording , the effect of excellent noise characteristics, high thermal stability

Inactive Publication Date: 2006-01-04
SHOWA DENKO KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, generally, magnetic domain walls are generated in the soft magnetic film, so that the soft magnetic film causes problems, including spike noise due to movement or disturbance of the domain walls, and instability of recording magnetization; for example, by Demagnetization and loss of recorded data caused by movement of domain walls caused by an external floating magnetic field (see, for example, JP-A HEI 6-187628, 5-81662, 7-105501 and 7-220921; The Journal of Electroanalytical Chemistry, Vol.491 (2000 ), p.197-202; and Proceedings of 25 th Academic Lecture Meeting of The Magnetics Society of Japan, 2001, 26aA-2)

Method used

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  • Perpendicular magnetic recording medium, production process thereof, and perpendicular magnetic recording and reproducing apparatus
  • Perpendicular magnetic recording medium, production process thereof, and perpendicular magnetic recording and reproducing apparatus
  • Perpendicular magnetic recording medium, production process thereof, and perpendicular magnetic recording and reproducing apparatus

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102] A glass substrate with an average surface roughness (Ra) of 0.5nm or less is chemically cleaned, and then, by DC magnetron sputtering, an adhesive layer (thickness 10nm) consisting of a Ti film and a Ni film are sequentially formed. A seed layer (thickness 20 nm) was formed. Next, the obtained laminated product was subjected to conventional pretreatment, and then a CoNiFeP soft magnetic film (3000 nm in thickness) serving as an undercoat film was formed by using the electroless plating solution in Table 1.

[0103] Figure 5 An example of an apparatus 11 for forming a soft magnetic film is shown. The plating tank 18 containing the plating solution is placed in the water tank 12, and the glass substrate 20 on which the seed layer is formed and held in the plating solution in the plating tank 18 is immersed. On the substrate holder 19 provided with a rotation mechanism (not shown). The substrate holder 19 is vertically movable supported by the substrate holding hook 17...

example 2

[0110] The procedure of Example 1 was repeated except that the strength of the external magnetic field applied in the plating was changed from 35G to 100G (neodymium-iron-boron magnet). Table 4 shows the results, namely, Bs, degree of isotropy, perpendicular magnetic anisotropy, MF-S / N ratio, and presence / absence of magnetic domain walls.

example 3

[0112] The process of Example 1 was repeated, except that the composition of the plating solution was changed to that shown in Table 2. Table 4 shows the results, namely, Bs, degree of isotropy, perpendicular magnetic anisotropy, MF-S / N ratio, and presence / absence of magnetic domain walls.

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Abstract

The invention is directed to a perpendicular magnetic recording medium (10) including a non-magnetic substrate (1), and at least a soft magnetic undercoat film (2) formed of a soft magnetic material, an alignment-regulating film (3) for regulating the crystal alignment of a film provided directly thereon, a perpendicular magnetic film (5) in which easy-magnetization axes are oriented generally perpendicular to the substrate, and a protective layer (6), the films and the layer being provided atop the substrate, wherein the soft magnetic undercoat film exhibits magnetic isotropy or has easy-magnetization axes oriented perpendicular to the substrate. According to the present invention, an undercoat film (2) having no magnetic domain walls can be formed. When the undercoat film is employed, there can be provided a perpendicular magnetic recording medium and a perpendicular magnetic recording and reproducing apparatus which exhibit high thermal stability and excellent noise characteristics, and which attain high-density recording.

Description

[0001] Cross References to Related Applications [0002] This application is filed under 35 U.S.C. §111(a) and claims priority under 35 U.S.C. §119(e)(1) to provisional application 60 / 426,398 filed November 15, 2002 under 35 U.S.C. §111(b). technical field [0003] The present invention relates to a perpendicular magnetic recording medium, a method of manufacturing the same, and a perpendicular magnetic recording device. In particular, the present invention relates to a perpendicular magnetic recording medium comprising a magnetic film in which an axis of easy magnetization is oriented perpendicular to a substrate, the magnetic film serving as a recording layer. Background technique [0004] A magnetic recording medium used in practice is a longitudinal recording type employing a magnetic film whose axis of easy magnetization is oriented parallel to the substrate surface. However, in such a magnetic recording medium, adjacent magnetic domains serving as signal sources are m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B5/65G11B5/73G11B5/738G11B5/667G11B5/84
Inventor 大森将弘太田浩志逢坂哲弥朝日透横岛时彦
Owner SHOWA DENKO KK
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