JPS586528A - Flexible magnetic recording medium - Google Patents

Abstract

PURPOSE:To provide sufficient durability against contact wear with a head, by coating a flexible base coated with continuous thin film of magnetic iron oxide, with a hard nonmagnetic substance oscide film. CONSTITUTION:One of both sides of a flexible base 1 such as polyester and polyimide are coated with a continuous thin film 3 made of magnetic iron oxide consisting essentially of gamma-Fe2O3, Fe3O4 or an intermediate composition of the two, and Al2O3 or SiO2 is processed with sputtering or electron beam vapor- deposition on the film 3, to form a hard nonmagnetic substance oxide film 4. Thus, a magnetic recording medium without increase in dropout and reduction in reproduced output can be obtained even for repetitive use while bringing into contact with the head.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a magnetic recording medium which can be used in OII optical storage devices such as magnetic tape devices and two-sided disk drives.

magnetic tape storage ms flexible disk storage t
As shown in Fig. 1 or Fig. 2, a flexible magnetic recording body used in the past has been constructed by coating a flexible substrate 10 such as polyester with a magnetic film 2 on one side or both sides. Hiro conventional r-1 is used as the magnetic film 2.
``e, O, C, fake, fine particle coating film of magnetic metal, etc. is mainly used in KMi.

In order to increase the recording density in general KWI recording, it is known that it is effective to increase the coercive force of the recording medium and to reduce the thickness of the ila layer. However, if the coercive force is extremely increased, the magnetic 16.19 In the case of coated media, which are conventionally known to be difficult to write on due to saturation, due to the manufacturing process, it is necessary to keep the errors low and to thin the surface. There was a limit to the improvement of F recording density because of the difficulty in recording f.
It is preferable as a fi-ki log structure, and can form a thin and uniform acid-dried pig iron chain with magnetic properties, and 1Wl.
9. Magnetic storage device using magnetic tape storage, flexible disk device, and flexible disk device Dehiro,
In the 70F version, the magnetic recording body and the magnetic head are in relative motion until they are in contact with each other.The present inventors formed a continuous magnetic iron oxide thin film on a flexible substrate as described above. A magnetic recording medium with a configuration like this is used as a magnetic tape device,
When used repeatedly for flexible disk devices,
(The contact line between the continuous thin film and the magnetic head becomes unstable near the protrusions existing on the surface of the ffl thin film).
It has been found that part of the continuous thin film peels off near the protrusion, resulting in an increase in citrotube out, and furthermore, the kilK and p regeneration output decreases due to abrasion or pressurization of the continuous # film.

OBJECTS OF THE INVENTION 1. In a flexible magnetic recording body using IIA iron oxide pig iron dilution as a recording medium, which is a new recording body invented by Kirisha et al. Fi8. which was used repeatedly while in contact with the head. An object of the present invention is to provide a magnetic recording material that does not increase dropout or reduce reproduction output.The one-shot recording material according to the present invention has a magnetic iron oxide continuous thin film formed on a flexible substrate. A hard non-magnetic oxide coating is coated on a continuous thin film of rock-based pig iron.

Next, the present invention will be described in detail with reference to the drawings.

FIG. 3 is a sectional view showing the structure of a magnetic recording medium according to the present invention. This is a flexible substrate 10 made of polyester, polyimide or Teflon, with r-Fe on one or both sides!
Os e iI'es 0416 b i'111M
Magnetic iron oxide continuous thin film 3 containing intermediate composition as main component
This magnetic iron oxide continuous thin film [3 is coated with Al
, 0□ or 810! Hard non-magnetic oxide coating 11 such as
14T - Coated as a protective film. The hard non-oxide film 4 is formed by sputtering or electron beam evaporation of Oa or biO8. This is because the hard non-magnetic oxidation detector m4 formed by K in this manner has high rigidity.

It can withstand 90 minutes of contact friction with the head.Next, the magnetic recording body according to the present invention will be explained in detail with reference to practical examples and comparative examples.

Mei*ni Polyimide is used as a flexible substrate, and on this substrate 1 &
A continuous thin film of C4IILAII & body 3 is formed by sputtering method, and an S retaining film 4 consisting of 81 is further formed on this magnetic medium 3 by a sloping method to make a flexible disk. 9. Implementation-2 By firing the running vapor and insulator shown in the practical column 1 at 200°C in the atmosphere, oxidizing 74'6.(
We made a flexible disk called J3.

Implementation H3 wiii Same as Example 1, except that Al
A flexible disk was made by forming snow Os by a sputtering method.

Implementation N4 The magnetic recording body shown in Actual Jmf13 is fired at 200°C in the atmosphere to oxidize k“e8”4 and 7--I! □
e. Make a flexible disk with a temperature of 0°9.

Comparative Example 1 A flexible disk was manufactured by using a polyimide substrate as a flexible disk and forming a continuous thin film of ζ magnetic medium 3 on the substrate 1 by sputtering.

Comparative Example 2 A flexible disk was produced by oxidizing re,04 to r-FetQ by firing the magnetic recording body shown in Comparative Example 1 at 20-0° C. in the atmosphere.

Durability tests were conducted by continuously operating the flexible disks shown in Examples 1 to 4 and Comparative Example 1.2 while keeping them in contact with the head. Magnetic iron oxide continuous thin
The contact state between the continuous thin film and the head became unstable near the protrusions on the surface of the K, and when a part of the continuous thin film peeled off near the protrusions, dropouts increased compared to K.
Due to pressurized demagnetization of Fe, 04m1, the playback output of the flexible disk of comparative example 1 decreased to less than 50X after 10,000 passes. On the other hand, with the flexible disks tested in Examples 1 to 40, there was no increase in dropouts or decrease in playback output even after 1,000,000 discs.

Possible for the above implementation rows! Although we have given an example of using polyimide as the flexible substrate, the same is true even if other flexible substrates such as polyester or Teflon are used. In addition, other elements such as cobalt and copper may be present, and magnetically cast iron may be used to maintain a non-stoichiometric composition.

In addition, in the above embodiments, there were nine cases in which the flexible magnetic recording medium was a flexible disk, but the same is true even if a magnetic tape is used.As described above, according to the present invention, the present invention Invention K In this novel magnetic recording material, a flexible magnetic recording material using a magnetic saponified iron continuous thin metal as a recording medium has sufficient durability against contact friction with a head. It will be done.

[Brief explanation of the drawing]

Fig. m1 and Fig. 2 are partial cross-sectional views of the 1-gas recorder,
Figure 3 is a partial sectional view of the magnetic body of the present invention. In the figure, lti flexible substrate, 2#i magnetic film media. 3 is ffi iron oxide tap thinning conversion, 4 is a retainer made of hard non-magnetic oxide! 1 Figure f 3 Bile f 2 Bile

Claims (1)

[Claims] A magnetic recording body characterized in that a flexible substrate is coated with continuous thin strips of magnetic tapped pig iron, and a hard non-magnetic oxide film is coated on a continuous thin layer of KMa acid tapped pig iron.