JPH02220220A - Perpendicular magnetic recording medium - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a perpendicular magnetic recording medium suitable for high-density recording;
In particular, it concerns the orientation of the recording layer.

[Prior Art] Conventionally, a polymer film made of polyimide has been used for a flexible disk substrate, and a perpendicular magnetic recording layer provided thereon has good orientation. on the other hand,
The rigid disk substrate uses an aluminum substrate that is lightweight and easy to process, and is anodized or subjected to surface treatments such as N1-P to provide mechanical strength.

(Haka Kobayashi "Co-Cr perpendicularly magnetized aluminum IJ disk" Tohoku University Research Institute Symposium, Perpendicular Magnetic Recording Media P, 177-187. March 1982) [Problem to be solved by the invention] A problem with rigid disk substrates is that when a perpendicular magnetic recording layer is provided on an aluminum substrate, the perpendicular alignment deteriorates, making it difficult to return a good perpendicular layer.

This invention was made to solve the above problems, and even in vertical layers on rigid disk substrates,
The purpose is to obtain a perpendicular magnetic recording medium with good orientation.

[Means for Solving the Problems] A perpendicular magnetic recording medium according to the present invention includes a metal substrate, a polymer layer provided on the metal substrate, and an axis of easy magnetization on the polymer layer in a direction perpendicular to the film surface. This is a perpendicular magnetic recording medium equipped with a perpendicular magnetic recording layer.

[Function] The perpendicular magnetic recording medium according to the present invention has a structure in which on a metal substrate,
A polymer layer is provided to remove the influence of the substrate, and a perpendicular magnetic recording layer that is compatible with the polymer layer is provided on the polymer layer, so that the recording layer has good vertical alignment.

[Example 1] Figure 1 is a cross-sectional view of a portion of an embodiment of the present invention, and (1) is a rigid disk on which surface treatment such as anodization or N1-P is performed on an AI substrate or an A1 substrate. A metal substrate (2) is a polymer layer, and a polymer layer made of polyimide or polyester was sputtered on the metal substrate (1) by a known method to a thickness of 2 μm.

(3) is a perpendicular magnetic recording layer, which was provided on the polymer layer (2) so that the axis of easy magnetization was perpendicular to the film surface.

In this experiment, Cr: 22.197% Co-Cr
The sputtering conditions using the target are shown in the table.

FIG. 2 shows the film thickness dependence of the half-value width Δθ50 of the rocking curve of the (002) plane of a Co--Cr film having a c-p structure using an X-ray diffractometer. As can be seen from Figure 2, the flexible Co-Cr film (indicated as polyimide in the figure) Δ
When θ50 is the smallest (shows good overlapping alignment, and a Co-Cr film (indicated by AI in the figure) is formed directly on the AI substrate, the vertical alignment deteriorates.Anodized AI When using a substrate (indicated by anodized A1 in the figure), A!
Vertical alignment is improved compared to when a Co--Cr film is formed on the substrate. Also, C0-Cr on polyimide
Since the vertical alignment of the film (indicated by polyimide in the figure) is good, it was decided to form a co-Cr film (indicated by polyimide/A! in the figure) after forming the polyimide film on the substrate.

As a result of the measurements, it was found that it had good orientation, although it was inferior to that of a flexible perpendicular magnetic recording medium. Note that a soft magnetic layer made of Fe--Ni may be provided between the polymer layer and the perpendicular magnetic recording layer.

Note that although an aluminum substrate is used as the metal substrate in the above embodiment, a copper substrate may also be used.

[Effects of the Invention] As described above, according to the present invention, there is provided a metal substrate, a polymer layer provided on the second metal substrate, and a perpendicular magnetization layer on which the axis of easy magnetization is perpendicular to the film surface. Since a magnetic recording layer is provided, a perpendicular magnetic recording medium with good orientation can be obtained even in a perpendicular magnetic recording film on a metal substrate.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing one embodiment of the present invention, and FIG. 2 is an explanatory view showing the half-width with respect to a substrate. In the figure, 1> is a metal substrate, (2) is a polymer layer, and (3) is a metal substrate.
) is the perpendicular magnetic recording layer. Figure 1 Figure 2

Claims (1)

[Claims] A perpendicular magnetic recording medium comprising a metal substrate, a polymer layer provided on the metal substrate, and a perpendicular magnetic recording layer on the polymer layer in which the axis of easy magnetization is perpendicular to the film surface.