JPH01287819A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain the magnetic recording medium with which the spacing loss is decreased by disposing a thin diamond-like hard carbon film via an Si or Ge layer on a thin ferromagnetic metallic film. CONSTITUTION:The thin ferromagnetic metallic film 2 consisting of Co-Cr, Co-Ti, Co-Ni, Co-Zr, etc., is provided on a high-polymer film 1 and further, the thin film 3 consisting of Si or Ge is disposed thereon; a the D. L. C. film 4 is formed thereon. The thin Si or Ge film 3 more epitaxially assists the crystal configuration of the diamond structure of the D. L. C. film 4 and, therefore, the hardness is increased. Sufficient protective performance is obtd. even if the film thickness is reduced. The spacing loss is thus decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording medium whose magnetic recording layer is a ferromagnetic metal thin film suitable for high-density recording.

Conventional technology In recent years, due to the demand for high-density magnetic recording, magnetic recording using a Ge-based ferromagnetic metal thin film as the magnetic recording layer has become popular, both in conventional longitudinal recording and in the recently proposed perpendicular magnetic recording. There is a strong desire to put the medium into practical use, and research is active.

In particular, perpendicular magnetic recording, in which recording demagnetization during short wavelength recording can be ignored, uses a single magnetic pole head, permalloy thin film, and Go-O.
It was disclosed in Japanese Patent Publication No. 58-91 that it exhibits extremely excellent high-level recording characteristics when used in combination with a two-layer medium consisting of a perpendicularly magnetized film. While improvements have been made in the field of technology, the possibility of high-density recording has been shown to be possible even by combining a helical scanning method using a ring-shaped magnetic head, which currently achieves the highest recording density, and a single-layer medium. Publication No. 61-77128]
Practical application is gaining momentum.

The most important issue for practical application is to ensure durability that can maintain high-density recording characteristics, and various protection and lubricating films have been studied [JP-A-61-131231, JP-A-61-1518].
Publication No. 30, #! JP-A No. 61-224128], the use of a carbon-based protective film [JP-A No. 61-12]
No. 6627, JP-A-61-220120, JP-A-61-233412] It has become known that it is effective in improving durability, and is particularly expected to be used as a protective film for hard carbon films. Large [Foreign journal IEICE TRANSACTIONS ON MAGNETICS]
AGNKTIC8) vo/MAG-23, No.

P, P, 2410-2412 (1987)).

Problems to be Solved by the Invention Among hard carbon films, the hardness of diamond-like hard carbon films (hereinafter referred to as L and C films) is important for their protective performance, and they can be used with sputtering methods, plasma acceleration methods, and ion beam methods. Currently, solutions are being taken by optimizing manufacturing conditions such as the deposition method, but spacing loss at short wavelengths is a problem because it is necessary to obtain sufficient protection performance. There was a hope for improvement. The present invention was made in view of the above circumstances, and provides a magnetic recording medium with improved spacing loss.

Means for Solving the Problems In order to solve the above-mentioned problems, the magnetic recording medium of the present invention comprises:
A diamond-shaped hard carbon thin film is disposed on a ferromagnetic metal thin film via an 81 or 00 layer.

Operation The magnetic recording medium of the present invention has the above-described structure, and since the Sl or Ge thin film epitaxially supports the crystal alignment of the L, C film, the hardness increases and even if the film is made thinner. Since sufficient protection performance can be achieved, spacing loss can be reduced.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. The figure is an enlarged sectional view of one embodiment of the magnetic recording medium of the present invention. In the figure, 1 is polyamide, polyimide, polyether ether ketone.

Polymer film such as polyether sulfon, polyphenylene sulfide, polysal 7, polyethylene naphthalate, etc. If necessary, a worm-like undercoat layer made of water-soluble polymer or T: xo 2 + Zr O 2 *
It is also possible to use a layer coated with fine particles such as Ca c 05 + Or 205 or the like.

2 is Go-Cr, Go-Ti, Co-N
i, Go-Zr.

Go-Ru, Go-Pt, Go-T1L+ Co −
W, Go-0, Go-Ni-0, Go-C
Sputtering method using a ferromagnetic metal thin film such as r-Nb, Go-Ni-P, etc.

It is formed by ion blating method, electron beam evaporation method, etc.

3 is a thin film of Si or Go, preferably formed by 20 to 50 people using a high frequency sputtering method or an ion blasting method, but of course, it is also possible to raise the temperature of the polymer film and deposit it with an electron beam. A film may be formed by this method. 4 Hari, L, C.

A film with a thickness of 50A to 1
A film of 0.00 μm may be used. 5 is a lubricant such as higher alcohol or fluorine oil by vacuum deposition method, solution coating method, etc.
It is sufficient to arrange the amount so that the spacing loss can be ignored.

Although the present invention may be implemented using either a magnetic disk or a magnetic tape, one example will be explained in more detail below in comparison with a comparative example. 15 pieces/(
μm), and Go
-Cjr (Co: s.

wt%) 1800 perpendicularly magnetized films, Sl or Ge
A Si film or a Ge film is placed using a high-frequency sputtering method using the target as a target, and then a L and C film is formed using a graphite target, and perfluoromyristic acid is placed using a vacuum evaporation method. A magnetic tape with a width of 8 mm was manufactured. On the other hand, in the comparative example, L, C, films were formed under the same conditions without using Si or Ge. With 8mm video modified from these magnetic tapes,
With an amorphous head with a gap length of 0.13 μm,
Bit length 0.19μm.

A signal with a trunk pitch of 6 μm was recorded, and the playback output was compared relative to the other, and the durability was compared in the still state by the time until noise became noticeable when visually inspecting the image. The results are summarized in a table for different tape conditions. It was shown.

(Left below) From the table, it can be seen that improving the spacing loss while obtaining almost the same durability as the conventional example leads to an increase in output of approximately 3 (dB), which is clearly useful for high-density recording. be. Nao C
This is a matter worth mentioning as it has been confirmed that the o -N i -0 obliquely deposited film can have a thinner protective film than the Go-Or thin film.

Effects of the Invention As described above, the present invention has the excellent effect of providing a magnetic recording medium that can realize high-density recording while ensuring durability.

[Brief explanation of the drawing]

The figure is an enlarged cross-sectional view of a magnetic recording medium according to an embodiment of the present invention. 1...Polymer film, 2...Ferromagnetic metal thin film, 3...Si (or G6) 4 film, 4
...D, L, C membranes.

Claims (1)

[Claims] A magnetic recording medium characterized in that a diamond-shaped hard carbon thin film is disposed on a ferromagnetic metal thin film via a Si or Ge layer.