JPH02165416A - Thin-film magnetic recording medium - Google Patents

Abstract

PURPOSE:To improve the durability of a medium surface against the sliding or casual collision of a magnetic head slider, etc., at the time of recording and reproducing by utilizing the nonmagnetic guard bands provided between the recording tracks of the medium surface. CONSTITUTION:This recording medium is constituted by dividing magnetic films 24, which are provided on a substrate 21 and consist of at least one layer, concentrically at a prescribed width to plural films and providing the hard nonmagnetic guard bands 25, which project slightly from the surfaces of the magnetic films 24, between the respectively divided magnetic films 24a to 24f. The protection against the sliding, collision, etc., of the magnetic head slider at the time of recording and reproducing is sufficiently assured on the surface of the magnetic films 24, by which the impact resistance of the medium surface is enhanced. In addition, the durability is improved; for example, the attraction trouble of the magnetic head slider at the time of Contact Start Stop operations, etc., is prevented.

Description

[Detailed Description of the Invention] [Summary] Regarding a thin film magnetic recording medium used in a magnetic disk device, etc., and in particular a medium structure with good reproduction characteristics and durability against head contact, the present invention relates to a non-magnetic magnetic recording medium provided between recording tracks on the medium surface. The purpose of this is to improve the durability of the medium surface against the sliding of the magnetic slider during recording and playback or unexpected collisions (shocks) by using the guard pad, and consists of at least one layer on a non-magnetic substrate. Has a magnetic film,
And the magnetic film is divided into a plurality of concentric circles with a predetermined width,
A hard non-magnetic guard pad protruding from the surface of the magnetic film is provided between each of the divided magnetic film parts.

[Industrial application field]

The present invention relates to a thin film magnetic recording medium used in magnetic disk drives and the like, and particularly to a medium structure with good reproduction characteristics and durability against head contact.

In recent years, magnetic disk drives, which have become mainstream as external storage devices for computer systems, are required to be smaller, faster, and have larger capacities. The practical development of thin film recording media is progressing by making full use of available sputtering methods, and the density of recording tracks tends to be further increased.

For this reason, side crosstalk for reproducing recorded signals from adjacent tracks due to high crack density can be reduced, and durability against head contact on the medium surface due to miniaturization of the gap between the head and the medium due to high density recording has been improved. It is requested.

[Conventional technology]

As shown in the example of a perpendicular magnetic recording medium in FIG. 4, a conventional thin film magnetic recording medium is a non-magnetic disk substrate 11 made of aluminum (aluminum, etc.) that has been subjected to an alumite surface treatment, etc. A soft magnetic layer 12 with high magnetic permeability made of Ni-Fe and a perpendicular magnetization recording layer 13 made of Co-Cr or the like are arranged in a laminated manner on the soft magnetic layer 12, and the magnetization of the perpendicular magnetization recording layer 13 is A non-magnetic guard pad 15 made of SiO□ or the like is embedded in a non-magnetic recording area between a plurality of concentric data tracks 14 formed by recording so as to reach the substrate surface, and the perpendicular magnetization recording layer This prevents magnetization recording blur in the 13 data tracks 14, and as a result, reduces side crosstalk that reproduces leaked signals from adjacent tracks, making it easier to increase track density.

[Problem to be solved by the invention]

By the way, in the thin film magnetic recording medium as mentioned above,
Sliding of the magnetic rad slider or unexpected collision (impact) with respect to the medium surface during recording and reproduction is unavoidable, and in order to protect the information magnetized and recorded in the perpendicularly magnetized recording layer 13, the surface of the recording layer 13 is Applying a protective film is essential.

However, since the protective film applied on the recording layer 13 needs to be as thin as possible from the perspective of optimizing the distance between the head and the medium, which affects the recording resolution, the improvement in durability is not necessarily sufficient. , further improvements were needed.

In view of the above-mentioned conventional problems, the present invention utilizes a non-magnetic guard pad provided between recording tracks on the medium surface to prevent sliding of the magnetic hent slider or unexpected collision (impact) during recording and reproduction. ), etc. The object of the present invention is to provide a new thin film magnetic recording medium that has improved durability of the medium surface against the like.

[Means to solve the problem]

In order to achieve the above object, the present invention has a magnetic film consisting of at least one layer on a substrate, and the magnetic film is divided concentrically into a plurality of parts with a predetermined width, and between each divided magnetic film part. , a hard non-magnetic guard pad for protecting the partition is provided that protrudes from the surface of the magnetic film.

[For production]

In the thin film magnetic recording medium of the present invention, a magnetic film consisting of at least one layer provided on a substrate is divided concentrically into a plurality of parts with a predetermined width, and between each divided magnetic film there is a hard hard film that slightly protrudes from the surface of the magnetic film. By providing a non-magnetic guard pad, sufficient protection against sliding, collision, etc. of the magnetic RAD slider during recording and reproduction on the surface of the magnetic film is ensured;
The impact resistance of the media surface is increased. Moreover, since the medium surface becomes a minutely uneven surface due to the protrusion of the non-magnetic guard pad,
) Durability is improved, such as preventing adhesion failure of the magnetic RAD slider during operation.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of a main part, partially in cross section, of an example in which an embodiment of a thin film magnetic recording medium according to the present invention is applied to a perpendicular magnetic recording medium.

In the figure, 21 is a non-magnetic disk substrate made of aluminum (A f ), etc., which has been subjected to an alumite surface treatment, etc. On the disk substrate 21, for example, Ni-F
A soft magnetic layer 22 with high magnetic permeability made of E and Co on its surface.
Perpendicular magnetization recording 123 made of -Cr is provided in a laminated manner.

Further, the laminated film 24 made up of the soft magnetic layer 22 and the perpendicular magnetization recording 1123 is divided, for example, into a predetermined width corresponding to the data track width in the radial direction, and each divided laminated film is concentrically shaped. Between the portions 24a to 24f, as shown in the figure, hard nonmagnetic guard pads made of 5 iOz, Al zoz, etc. for protecting the partitions protrude minutely from the surface of the perpendicular magnetization recording layer 23 by about 100 to 200 micrometers. 25 are arranged.

Therefore, in such a medium configuration, not only magnetization recording bleeding and side crosstalk can be reduced, but also the medium surface becomes a minute uneven surface due to the protrusion of the hard non-magnetic guard pad 25, so the magnetic rad slider The impact resistance of the medium surface against sliding, collision, etc. is increased, and since the contact area with the magnetic rad slider is reduced, head adsorption is prevented and durability is improved.

Further, FIG. 2 is a perspective view of a main part, partially in section, of an example in which another embodiment of the thin-film magnetic recording medium according to the present invention is applied to a perpendicular magnetic recording medium, and the same part as in FIG. 1 is shown. are given the same reference numerals.

The embodiment shown in this figure is different from the example shown in FIG. The recording layer is divided into predetermined widths corresponding to the data track width, and 100 to 200 people from the surface of the perpendicular magnetization recording layer 23 are placed between each of the divided concentric recording layer portions 23a to 23f as shown in the figure. 5i02 slightly protruding
, or a configuration in which a hard non-magnetic guard pad 31 for protecting the partitions consisting of four A2□03 etc. is provided.

This structure of the embodiment also provides the same effects as the embodiment shown in FIG. 1, such as improved durability and prevention of head adsorption.

In order to fabricate a perpendicular magnetic recording medium having the structure of the embodiment described above in FIG. 1, first, as shown in FIG. Non-magnetic disk substrate 2
A hard Sing film 41 having a thickness of 0.7 μm is deposited on the etching film 1 by sputtering, and an etching mask 42 is formed on the surface thereof using a resist film.

Next, as shown in FIG. 3, the portions corresponding to the data tracks are removed from the Sin film 41 through the etching mask 42 by ion milling or the like to form a hard non-etched film made of a plurality of 5i02. A magnetic guard pad 25 is formed.

Next, as shown in FIG. 3(C), on the disk substrate 21 including the non-magnetic guard pad 25, a soft magnetic film 22 having a thickness of 0.5 μm and having a high magnetic permeability made of, for example, Ni-Fe is placed.
A perpendicular magnetization recording layer 23 made of Co--Cr and having a thickness of 0.18 .mu.m is deposited on the surface thereof by continuous sputtering or the like. Note that the high magnetic permeability soft magnetic film 22 may be formed by a plating method.

After that, an etching mask 4 made of the resist film is formed.
By etching away the mask 2 through oxygen plasma treatment, the NiFe film 43 and Co--Cr film 44 laminated on the mask 42 are also removed at the same time. Then, a lubricating film (not shown) made of perfluoropolyether or the like, or a protective film and a lubricating film are applied as necessary on the perpendicular magnetization recording layer 23 to complete the process.

In this manner, as shown in FIG. Between each of the divided concentric laminated film portions 24a to 24f, hard sections made of SiO□ protrude minutely by about 200 mm from the surface of the perpendicular magnetization recording layer 23, as shown in the figure. A perpendicular magnetic recording medium of the present invention having good durability and provided with a non-magnetic guard pad 25 for protection can be obtained.

Although the above embodiments are applied to perpendicular magnetic recording media, the present invention is not limited to this example. A similar effect can be obtained if

〔Effect of the invention〕

As is clear from the above description, according to the thin-film magnetic recording medium according to the present invention, there is a non-magnetic hard partition that slightly protrudes from the surface of the medium between each area corresponding to the data track width of the medium. The configuration with embedded guard pads not only reduces magnetization recording bleeding and side crosstalk, but also increases the impact resistance of the media surface against magnetic slider sliding and collisions, and prevents head adsorption. Durability is improved. In addition, since a thick protective film is not required, it has many excellent effects such as improved recording resolution, and is extremely advantageous when applied to various thin-film magnetic recording media aiming at high track density.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional perspective view of essential parts of an example of a thin-film magnetic recording medium according to the present invention applied to a perpendicular magnetic recording medium, and FIG. 2 is a thin-film magnetic recording medium according to the present invention. FIG. 3 is a perspective view of a main part showing a partial cross section of another example in which one embodiment of the medium is applied to a perpendicular magnetic recording medium, and FIG. 3 is a method for manufacturing the perpendicular magnetic recording medium of FIG. 1 to which the present invention is applied. FIG. 4 is a sectional view of a main part showing an embodiment in the order of steps; FIG. 4 is a perspective view of a main part shown in partial cross section to explain a conventional thin film magnetic recording medium using an example of a perpendicular magnetic recording medium. In FIGS. 1 to 3, 21 is a disk substrate, 22 is a high permeability soft magnetic layer, and 23 is a disk substrate.
is a perpendicular magnetization recording layer, 23a to 23f are divided recording layer parts,
24 is a laminated film, 24a to 24'' are divided laminated film parts, 25
．． 31 is a non-magnetic guard pad, 41 is a 5iOz film, 42
1 and 2 indicate etching masks, respectively. Figure 3

Claims (1)

[Claims] It has a magnetic film (24) consisting of at least one layer on a non-magnetic substrate (21), and the magnetic film (24) is divided concentrically into a plurality of parts with a predetermined width, and each of the divided magnetic film parts (
A thin film magnetic recording medium characterized in that a hard nonmagnetic guard pad (25) protruding from the surface of the magnetic film (24) is provided between the magnetic film (24a to 24f).