JPS6342054A - Recording medium - Google Patents

Abstract

PURPOSE:To prevent deterioration with lapse of time and to obtain a high- reliability recording medium by sandwiching an In or Al layer, further, layer contg. In or Al between magnetic layers, thereby forming multi-layered structure. CONSTITUTION:For example, the magnetic layer 1 is laminated on the substrate 2, then an intermediate layer 3 is formed; the magnetic layer 1 is further formed on the intermediate layer 3 so that the intermediate layer 3 is sandwiched by the two magnetic layers 1. The intermediate layer 3 sandwiched by the magnetic layers 1 is the In layer or Al layer or the layer contg. In or the layer contg. Al. The magnetic layer made into the multi-layered film structure via the In layer or the Al layer in the above-mentioned manner is improved remarkably in the deterioration with lapse of time as compared to the recording medium which is not provided with such structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a recording medium, and more particularly to a high-density, highly reliable magnetic recording or magneto-optical recording medium.

(Technical Background of the Invention) Conventionally, among recording media used for magnetic recording and magneto-optical recording, recording media having a structure in which a magnetic layer is laminated via a non-magnetic layer are known, for example, as disclosed in Japanese Patent Application No. 180420/1983. Such a recording medium is intended to improve recording sensitivity and improve aging deterioration of magnetic properties, optical properties, etc. by stacking three or more magnetic layers with a non-magnetic layer in between. Met.

In such an invention, the material of the nonmagnetic layer is SiO
They may be dielectrics such as e, total oxides and metal nitrides such as TiOt, SiN, inorganic, organic, crystalline or amorphous materials such as organic polymers such as CSt, or metals. However, it is clearly stated that the thermoelectric coefficient should be as small as possible. However, the effect on aging of the magnetic layer and nonmagnetic layer was not clear.

On the other hand, a method of adding a so-called third element to a recording medium to improve aging or other magnetic or magneto-optical properties is also known. For example, JP-A-59-103314 describes the effect of adding In, Al, etc. as a third element. However, this only states that it contains In or Al, and does not describe anything about the structure of the recording medium film.

In particular, there is no mention of improvement over time.

As mentioned above, in the conventional technology, no research has been conducted on the film structure of recording media, their differences, effectiveness, etc., especially when focusing on improving the aging of recording media. Ta.

[Summary of the invention]

The present invention has been made in view of the above-mentioned points, and aims to improve the aging deterioration of a recording medium and further improve the effects of the conventional invention. The object is to achieve the above object by providing a highly reliable nonmagnetic layer.

Therefore, in the recording medium according to the present invention, the magnetic layer has A1
%i, Ink, a layer containing Al, or a layer containing In, two or more layers are stacked therebetween.

According to the recording medium according to the present invention, the In layer, AlJ'5,
Since the magnetic layer has a multilayer structure through either the layer containing In or the layer containing Al, it is highly effective in preventing deterioration over time, thereby realizing a highly reliable recording medium.

[Detailed description of the invention]

FIG. 1 shows a specific example of the structure of the present invention, in which 1 is a recording medium for magnetic recording or magneto-optical recording, 2 is a substrate, and 3 is an intermediate layer according to the present invention.

In this specific example, a magnetic layer 1 is laminated on a substrate 2, and then an intermediate layer 3 is formed, and a magnetic layer 1 is further formed on this intermediate layer 3. Intermediate rVI3 is in a settled configuration.

The magnetic layer 1 for magnetic recording or magneto-optical recording is not fundamentally limited in the present invention, and recording materials conventionally used for this type of recording layer can be effectively used. For example, plating such as CoCr, CoN1P, sputtering γ-Few O3, sputtering Co-r-
Magnetic recording materials such as Fed O3, TbTb5GdCo
Amorphous materials consisting of rare earth-transition metals such as MnB1
．． Examples include polycrystalline materials such as PtCo.

In the present invention, the intermediate layer 3 sandwiched between the magnetic layers 1 is an In layer, an A1 layer, a layer containing rn, or a layer containing Al. In this specification, the term "layer containing In or Al" refers to an alloy layer containing In or Al, a compound layer such as an oxide or a nitride, or a layer containing In or Al.
or In alloy or A1 alloy, the above In or A1
It is used as a concept to indicate a layer in which a compound containing CS t is dispersed in a matrix such as an organic polymer such as a photopolymer. Further, the In alloy, A1 alloy, In compound, Al compound, etc. may be either crystalline or amorphous, that is, the form is basically not limited in the present invention as long as it is a layer containing Al or In. .

FIG. 2 is a specific example showing a configuration in which two or more layers of intermediate JITs 3 are provided. As is clear from this figure, in this specific example, a magnetic layer l is provided on the substrate 2;
an intermediate layer 3, a magnetic layer 1, a second intermediate layer 3 and a magnetic layer 1;
are sequentially stacked.

As described above, the above specific example is a configuration in which two layers of intermediate N3 are provided, but it is clear that a similar configuration is possible in the case of three, four, or even more layers.

Note that the magnetic layer 1, which is the recording layer, can be made as thin as desired as long as the desired magnetic and magneto-optical properties can be changed, but with the current film-forming technology, the thinnest thickness of the magnetic layer alone is about 200λ. Usually, the thickness is about 5 μm. Similarly, the intermediate layer 3 may be as thick as desired as long as it does not impair the desired magnetic properties or magneto-optical properties of the magnetic layer 1.
Usually, the number of people may range from 1 to too many people. The combination of the magnetic film 1 and the intermediate layer 3 can be functionally modified in various ways.

FIG. 3 shows a specific example of a case where the intermediate layer 3 has an intermediate layer 3 in which In, Al, In alloy, or A1 alloy is dispersed, for example, in a Si02 layer, and 4 indicates the above-mentioned In, Al, or In alloy.
alloy, Al alloy, and 5 indicates a matrix layer of dielectric material such as Si02, oxide, nitride, organic polymer, other metal scraps, etc.

Examples of the present invention will be described below.

Example 1 A TbFe film was used as the magnetic layer and was formed using a two-pole RF scrubber apparatus. Glass was used as the substrate. The target used was a composite target in which 10+AlAl1 square Fe pellets (purity 99.99%) were arranged on 99.99% pure Fe having a size of 1001II+1φ.

When preparing the film, 7Xl0-7Tor is applied in advance.
After evacuation to r vacuum level, 4 xto-2 to 8 xto-2
Sputtering film formation was performed in Ar gas at Torr. Next, In was sputtered from the In target without breaking the vacuum.

The sputter thickness was the same, but the RF power was kept low.

Thereafter, TbFe was sputtered again from the TbFe composite target to obtain sample N001 having a structure in which an In layer was further provided. Each film thickness is TbFe layer SOO/In layer 100/T
There were 500 people in the bFe layer. This membrane configuration is similar to the membrane configuration shown in FIG.

Example 2 Sample No. 2 having two In layers was prepared in the same manner as in Example 1.
2 was produced. Each film thickness is TbFe layer 350, Inl
``The total film thickness of each of the 550 people was measured as sample No. 1.
I did the same thing. This configuration is similar to the membrane configuration shown in FIG.

Example 3 Sample No. 3 was prepared using Al instead of In in Example 1 and using the same film forming conditions.

Example 4 In place of In, an In chip was placed on Si02 with an area of In
: SiO* = 30: Sputtering was performed using a composite target arranged at a ratio of 70. The film forming conditions are the same as in Example 1. Further, the film structure is similar to that shown in FIG. This was designated as sample N004.

Comparative Example I A sample having only a TbFe layer without providing an In layer was prepared under the above sputtering conditions and designated as sample N015. Film thickness is 1000
It was a person.

Using the above-mentioned sample, it was placed in a constant temperature and humidity chamber at 70° C. and 85 power R1+, and changes in the characteristics of the film from the initial values were measured.

The characteristics are reflectance and magnetic change. The results are shown in Table 1.

(Margin below) Table 1 *For each sample, the value before the aging test was set to 1.

From Table 1 above, the following was found.

■ The recording medium according to the present invention, which has a multilayer film structure through an In layer or an A1 layer, is different from a recording medium without this (sample N
o, 5), the change over time can be significantly improved.

(2) Deterioration of the nonmagnetic layer is less in a layer structure containing In than in the case of Al.

■ It is more effective to use multiple In layers than to provide a single In layer.

(2) An In layer carrier is more effective than when In is dispersed in Si02.

Note that in this example, since no overcoat was applied, some surface deterioration was observed in the recording medium according to the present invention, but if an overcoat, an undercoat layer, or both were applied, the deterioration over time could be further improved.

〔Effect of the invention〕

As explained above, in the present invention, ln or A
By sandwiching a single layer, or even a layer containing In or Al between magnetic layers to form a multilayer structure, it is possible to prevent deterioration over time. Therefore, it is possible to obtain a highly reliable recording medium.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one specific example of a recording medium according to the present invention, FIG. 2 is a block diagram of another specific example, and FIG. 3 is a block diagram of a third specific example. ■...Magnetic layer, 2...Substrate, 3...Intermediate layer. Applicant's agent Masaki Amemiya Figure 1-1\-2 Figure 2-1\-1 Figure 3

Claims (2)

[Claims] (1) A recording medium characterized in that two or more magnetic layers are laminated with an Al layer, an In layer, a layer containing Al, or a layer containing In interposed therebetween. (2) The total thickness of each magnetic layer is 200 Å or more and 5 μm
2. The recording medium according to claim 1, wherein the recording medium is less than or equal to m.