JPS60154331A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To obtain a magnetic recording medium which is excellent in both corrosion resistance and still characteristic by forming a Co-Ni alloy layer on the surface of a substrate and forming a protective layer consisting of Co or Co oxide thereon. CONSTITUTION:A Co-Ni alloy layer 2 is formed by a vacuum deposition method, ion plating method, etc. on a substrate 1 consisting of polyester, etc. to form a highly corrosion resistant layer thereon. A Co oxide layer 3 is formed on the layer 2 by such a method by which Co oxide is deposited by evaporation on said layer in a vacuum atmosphere or by such method by which Co is vacuum deposited to form Co oxide in a vacuum atmosphere while gaseous oxygen is introduced thereon. Said layer 3 can be formed particularly by ion-bombarding the surface of the layer 2 in an atmosphere of Ar, etc. and removing Ni having a higher sputtering rate by utilizing the difference in sputtering rate between Co and Ni so as to leave only the Co. A protective layer 4 is thereafter provided on the layer by coating a soln. or melt of high fatty acid. The magnetic recording medium which is excellent in both corrosion resistance and still characteristic is thus obtd.

Description

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

Conventionally, a coated type was used for magnetic recording media such as magnetic tapes, in which a mixture of ferromagnetic metals and binders was coated on a substrate, but recently, ferromagnetic metals have been deposited on λ1 bodies using vacuum evaporation methods, etc. Thin film types have come into use.

By the way, thin film type magnetic recording media usually have drawbacks such as low corrosion resistance of the ferromagnetic thin film or poor still characteristics.

The object of the present invention is to improve the above-mentioned drawbacks and provide a magnetic recording medium with improved corrosion resistance and still characteristics.

In order to achieve the above object, the present invention provides a magnetic recording medium in which a substrate is provided with a ferromagnetic thin film and a protective layer, which coats a Go-Ni alloy layer and the Co-Ni alloy layer. The present invention provides a magnetic recording medium characterized in that it has a layer consisting of GO and 7/or CO oxide.

Hereinafter, the present invention will be explained based on illustrated embodiments.

In FIG. 1, 1 is a substrate made of a polymer film such as polygoster. 2 is a co-4Ji alloy layer formed as a VI layer on the surface of the substrate 1, in which a co-N1 alloy is coated with 1. (Several 100A to several 1000A attached to rest 1
Pi! It is formed to a degree of thickness. 3 is Co-Ni alloy 11i! ! 2, consisting of CO or CO oxide or a mixture thereof, with a thickness of several 10A to 100AV1
．． This is a peripheral layer, and CO or CO oxide is deposited in a vacuum atmosphere or while introducing oxygen gas. In addition,
In particular, the 00 layer is made of CO and N1 by ion bombarding the surface of the Qo-Jli alloy layer 2 in an atmosphere such as Ar.
It can also be formed by taking advantage of the difference in sputtering speed between the two to remove Ni, which has a faster sputtering speed, and leaving only CO.

4 is a protective layer, which is formed by coating and drying a solution or melt of higher fatty acid or the like.

In other words, according to Example -F, C has excellent corrosion resistance.
Since the o-Ni alloy layer and the CO layer and CO oxide layer, which have excellent steel properties, are VIHed, #4 corrosion resistance and steel properties are improved as a whole.

Note that, as shown in FIG. 2, the Go-Ni alloy layer 5 is made of Co-
When the ji alloy layer is composed of columnar grains, the layer 6 made of Co, CO oxide, etc. is formed to cover each columnar grain.

As described above, according to the present invention, a magnetic recording medium with excellent corrosion resistance and still characteristics can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of an embodiment of the invention, and FIG. 2 shows a sectional view of another embodiment of the invention. 1... Base body, 2.5... Co-Ni alloy layer, 3.
6...layer consisting of CO and/or COI compound,
4...Protective layer. Patent applicant Hitachi Capacitor Co., Ltd.; □

Claims (1)

[Claims] (1) In a magnetic recording medium in which a substrate is provided with a ferromagnetic thin film and a protective layer, the Co-Ni alloy layer and the Co-N
A magnetic recording medium characterized in that it has a bump made of Go and/or CO oxide covering an i-alloy layer.