JPS58208934A - Magnetic recording medium and its manufacture - Google Patents

Abstract

PURPOSE:To reduce Al2O3 produced during the formation of an AlN layer with C or B, and to enhance lubricity and abrasion resistance, by forming a ferromagnetic metal layer on the surface of a base, and a thin film of reducing substance, such as C or B, on this layer, and further, laminating an AlN layer. CONSTITUTION:The ferromagnetic metal layer 2 is formed on the substrate 1, such as polyester film, and then, a substance capable of reducing Al2O3, such as C, B, Ti, Cr, or Zr, is built up to the layer 2 in <=10nm thickness by the vapor deposition method or the like to form an undercoat layer 3. An AlN layer 4 having lubricity and abrasion resistance is obtained by evaporating Al through discharge in NH3 atmosphere. Al2O3 produced by a small amt. of O2 contd. in the atmosphere at the time of forming the layer 4 is reduced with the layer 3, and the purity of Al in the layer 4 is raised, resistance to abrasion and lubricity are enhanced. Hence, a magnetic recording medium superior in durability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording medium having an improved magnetic layer Km and a method for manufacturing the same.

Magnetic recording media, in which ferromagnetic metal is obliquely attached to a substrate such as a plastic film, have high coercive force and a high squareness ratio, and have a high magnetic recording density, and have recently come to be used as magnetic tapes, etc. .

To magnetic when used as magnetic tape etc.

In order to prevent the surface from being scratched and damaged, a layer of aluminum nitride, which has lubricity and wear resistance, is sometimes provided. The aluminum nitride layer is formed by evaporating aluminum in a nitrogen or ammonia gas atmosphere and during discharge to adhere to the surface of the magnetic layer. At this time, the atmosphere contains a small amount of oxygen gas. As a result, aluminum is evaporated and aluminum oxide is generated and mixed into the aluminum nitride layer. When aluminum oxide is mixed in, the lubricity and wear resistance of aluminum nitride are reduced.

The object of the present invention is to improve one or more of the following drawbacks: 1-1 To provide a magnetic recording medium with improved lubricity and wear resistance, and a method for manufacturing the same.

An embodiment of the present invention will be described below based on the drawings.

In the figure, 1 is a base made of a polymer film such as polyester. Reference numeral 2 denotes a magnetic layer laminated on the substrate 1, in which iron, cobalt, dichloromethane, or the like is obliquely adhered by a vacuum evaporation method, an ion platelet leg method, a spanokuri/reg method, or the like. 5 is a first layer made of a substance that reduces the aluminum oxide deposited on the magnetic layer 2, such as carbon or boron.

A material such as aluminum, titanium, zirconium, etc. is deposited to a thickness of less than too'A by a vacuum deposition method or the like. 4
1 is the second layer made of aluminum nitride laminated on No. 11-6, and aluminum nitride is deposited by emitting full S of 7A in an atmosphere containing nitrogen or ammonia scum and during discharge. .

That is, carbon and boron, which reduce aluminum oxide, are deposited on the base of aluminum nitride, resulting in oxidized aluminum produced by reaction with oxygen in the atmosphere.

The minilam adheres to the first layer and is reduced, increasing the purity of the aluminum nitride in the second layer and thus improving its lubricity and wear resistance.

As described above, according to the present invention, a magnetic recording medium and a method for manufacturing the same can be obtained which have great lubricity and wear resistance and improved durability.

[Brief explanation of the drawing]

The figure shows a cross-sectional view of an embodiment of the invention. 1...Base, 2...Ferromagnetic metal layer. 3...First layer, 4...Second layer. Patent applicant: Nichibun Capacitor Co., Ltd.

Claims (1)

[Claims] (1) In a magnetic recording medium in which a ferromagnetic metal is obliquely attached to a substrate, a first layer made of a substance that reduces aluminum oxide is laminated on the surface of the magnetic layer, and a ferromagnetic metal is laminated on the first layer. A magnetic recording medium comprising a second layer made of aluminum nitride. (21) In a method for manufacturing a magnetic recording medium in which a ferromagnetic metal is obliquely attached to a substrate, after forming a magnetic layer, aluminum oxide is reduced to the magnetic layer and a vine substance is attached to form the first layer. A method for manufacturing a magnetic recording medium, which comprises forming a second layer made of aluminum nitride by evaporating aluminum in an atmosphere containing nitrogen or ammonia gas and during discharge.