JPS60182011A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a magnetic recording medium suitable for high-density recording and having excellent mass productivity by forming successively an underlying layer consisting of a GaAI alloy and magnetic metallic layer on a nonmagnetic base body. CONSTITUTION:An underlying layer 2 consisting of a GaAI alloy and a magnetic metallic layer 3 are successively deposited on a nonmagnetic base body 1 to constitute a magnetic recording medium. A high polymer film consisting of, for example, polyethylene terephthalate, etc. are used for the body 1 and Co, Fe, Ni or the alloy thereof (for example, Co-Ni alloy, etc.), etc. are used as the layer 2. The GaAI alloy having the compsn. range contg. 2-40wt% AI is usable as the GaAI alloy constituting the underlying layer. Said GaAI alloy is the nonmagnetic low melting metal which expands in volume during solidification. A vapor deposition method, sputtering method, ion plating method, etc. are usable for forming the layer 2 and the layer 3 on the body 1.

Description

[Detailed description of the invention] Industrial applications The present invention relates to magnetic recording media.

Background technology and its problems In recent years, thin film magnetic recording media,
There is currently active research into magnetic recording media in which a ferromagnetic metal is formed on a non-magnetic substrate by methods such as vacuum deposition or sputtering. As a method for obtaining a magnetic layer having a high coercive force and a high coercive force, an oblique evaporation method has been proposed in which evaporated particles of a magnetic metal, such as Co, with a resistant total bending angle are incident obliquely. .

In addition, the present applicant's odor ζ is approximately 10% by vertical evaporation method.
1 that exhibits a high coercive force and a squareness ratio of i? iQ recording media have also been proposed. This magnetic recording medium is constructed by depositing layers of 1 to 11 on a non-magnetic substrate L, and then forming a layer P1 of gold, mainly made of Co, for example.

However, in the former magnetic recording medium, there were problems such as the backing of the magnetic f11 metal being lowered due to the P1 incidence, and the saturation flux density being lowered due to the introduction of oxygen. On the other hand, 1iJ
In the conventional magnetic recording medium, the substrate temperature must be maintained at a high temperature during film formation, which limits the types of nonmagnetic substrates that can be used, which poses problems in terms of productivity.

OBJECTS OF THE INVENTION In view of the above-mentioned points, the present invention has the following features: Suitable for mouth J density recording, L
The present invention provides a magnetic recording medium that is highly mass-producible.

Summary of the Invention The present invention is a magnetic recording medium in which a G3Al alloy substrate 1 and a metal magnetic layer are sequentially formed on a nonmagnetic substrate.

In the magnetic recording medium of the present invention, the evaporated particles of the aggressive metal can be incident almost perpendicularly to form C(?i 4'l Iti), so the backing of the magnetic layer becomes dense and +F1
Suitable for i-density recording. Also, 11. It is possible to produce /- in , leading to P production 11 [.

Example The present invention will be explained in detail below.

In the present invention, the non-magnetic substrate (1
)'' - a GaAl alloy layer (2) and a metal magnetic layer (3).
) are sequentially deposited to form a magnetic recording medium.

As the non-magnetic substrate (1), for example, a molecular film such as polyethylene terephthalate, polyamide i', polyamide/imide, polyimide, glass, ceramic, sapphire, or a metal plate with an oxidized surface can be used.

The metal magnetic layer (2) may be made of Co, L'E, old metal, or an alloy thereof (for example, a Go-Ni alloy).

As for the G8^1 alloy that constitutes 1-G4, 81 is 2
A composition ranging from 40% to 40% can be used. This GaA 1 alloy expands in volume as it solidifies.
It is a non-magnetic metal with a melting point of 11~4.

A vapor deposition method, a sputtering method, an ion-blating method, etc. can be used to form the Ga1lled layer (2) and the metal magnetic layer (3) on the non-magnetic substrate.

Example 1 1. OX
10-' Torr~1. The Garo
Al30 alloy was deposited by 500 people to form a carbon layer (2), and subsequently Co6sNi3s alloy was deposited by 200 people to form a metal magnetic layer (3). The temperature of the substrate 4 was measured once with a thermocouple located near the substrate, and the layer thickness was monitored with a quartz crystal oscillator. In this way, a magnetic recording medium was prepared as Example 1.

Example 2 By the same method as in Example 1, the substrate temperature was 100°C, Ga7o-8130 alloy was used for 500 people, Cog5Ni
200 people M, as alloy! I paid ¥. A magnetic recording medium obtained in this manner was designated as Example 2.

Example 3 In the same manner as in Example 1, the substrate temperature was set at 30°C, and gold was added to [+ato-8I]o for 500 min, C065-
Eight Ni35 alloys were installed. This ζi magnetic recording medium was prepared as Example 3.

Example 4 A substrate was prepared in the same manner as in Example 1. X! +10 degrees
Gavo-131] alloy at 0°C, 500 people, C
ogs-Ni3i alloy was deposited by 100%. The thus obtained magnetic recording medium was designated as Example 4.

1. The results of measuring the magnetic properties of the (d) recording medium of each example are shown in the table F. -3°.

As shown in the table above, each time an alloy of Ga and 81 is used as the 1-layer, the temperature of the non-magnetic cell 1 substrate is always ri!
Even if there is, the desired magnetic properties can be achieved. C8 has a melting point of 29.8℃, but the alloy with ^1 has a melting point of 26.4℃.
Due to the low temperature, a liquid -1 layer is formed.
When metal magnetic j- is formed on that l-, magnetic metal 111
(The Ga^1' alloy diffuses between the particles, weakening the magnetic coupling between the fine particles of the magnetic metal, and as a result, the magnetic recording medium has a coercive force of f!-7.

The metal magnetic layer is not limited to -W, but can also have a multilayer structure with 112 or 14 layers interposed therebetween.

Effects of the invention: According to the present invention described above, Ga that expands in volume during solidification
By forming the ``ζ alloy 1fii layer through the base layer 1 of ^1, the gold II alloy''('I: lI!!i can be refined even by vapor deposition from the almost !IFll'I direction, and r+
I have a high antimagnetic resistance] Moon 1c is fu, and high squareness ratio Rs is j! l
can be done.

Then, using metal magnetism 1@, it is combined with 2′(,1
1! : Since direct deposition has a 1+J capability, the backing of the metal magnetic layer 11- becomes dense, leading to 11li density recording. In addition, it can produce 11-products that are more effective than 1, 1-l rice cultivation, and the p-productivity is also higher. 1: Since it is a magnetic layer that is magnetically isotropic in the plane, it has an extremely wide range of applications such as tapes and disks.

Furthermore, in the present invention, the GaAl alloy of 1 to 2 layers has a low surface:
Point metal, substrate lA during film formation! Desired magnetism even if 1 degree is used as an electric layer 11. Since 'i 111 is obtained, thermal damage (curl, wrinkles, etc.) to the non-magnetic substrate can be eliminated.

For this reason, the degree of freedom in selecting a non-magnetic substrate for the shrine increases,
Temperature 21 tl'' - Design 11i for small control, no countermeasures required, extremely mass production)! It is suitable for 1.

[Brief explanation of drawings]

The figure is a diagram showing an example of the magnetic recording medium of the present invention. (1) is a non-magnetic 111 substrate, (2) is a [;-like I alloy 1 to earth layer, and (3) is a metal magnetic layer. Agent Sadado Ito Hidemori Matsukuma

Claims (1)

[Claims] A magnetic recording medium in which a GaAl alloy layer and a metal magnetic layer are sequentially formed on a nonmagnetic substrate.