JPS61110301A - Magnetic recording system - Google Patents

Abstract

PURPOSE:To obtain superior durability by combining a thin film type magnetic recording medium which is provided with a CoO protective film with a magnetic recording head made of Al2O3.TiC. CONSTITUTION:A vertical magnetic recording medium 10 is formed as a floppy disk by laminating a metallic thin-film layer 12 having high magnetic permeability 12 and a vertical magnetic recording layer 13 made of an alloy thin film of Co.Cr successively on both surfaces of a base 11, and furhter laminating a protective layer 14 of CoO thereupon. A vertical magnetic recording head 20, on the other hand, has a main magnetic pole 21 of a 'Permalloy(R)' thin film supported in a ferrite core 22 and also wound with an exciting coil 23, and is further provided with a slider part 24 made of high-hardness fine Al2 O3.TiC on a surface where the medium 10 slides. Those medium 10 and heat 20 are used in combination to realize a magnetic recording and reproducing system for the thin-film type durable magnetic recording medium.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a method for recording and reproducing magnetic recording on a thin film type magnetic recording medium having a recording layer made of a metal thin film containing a ferromagnetic metal as a main component. , and more importantly, a new magnetic recording and reproducing method that enables stable magnetic recording and reproducing over long periods of use.] In recent years, the demand for high-density recording has become higher and higher, and there is an alternative to the conventional coating type that uses binders. , those using ferromagnetic gold aSS as the magnetic recording layer, and furthermore,
A thin film type magnetic recording medium having a recording layer made of a metal Ill, such as one using a cobalt-based alloy III having perpendicular magnetic anisotropy, has been proposed as in Japanese Patent No. 8-91. However, when such a metal thin film is used as the magnetic recording layer, there is a drawback that the frictional resistance with the magnetic recording head is large, making it susceptible to wear and tear and lacking in durability.

For this reason, ferromagnetic gold fluW! There is an additional protective layer on top of A! Various materials have been proposed that include Ia molecules, high-hardness metals, ceramics, and the like.

However, the wear resistance of these thin-film magnetic recording media, that is, the lifespan of the magnetic recording media when repeatedly run on a magnetic head, is inferior to that of conventional coating-type magnetic recording media, and is still insufficient for practical use. So, there it is.

Furthermore, magnetic recording heads for conventional coating-type magnetic recording media are known in which the surface that slides on the recording medium is made of barium titanate, etc., but these , which do not damage the media, do not wear out the head sliding surface itself, and are highly durable.

However, unlike the above-mentioned coated media, which is impregnated with lubricant to improve durability, the thin film type magnetic recording medium has a recording layer made of a thin film of gold that cannot be impregnated with lubricant. The magnetic recording head is easily damaged by sliding with the recording medium, and this damage is also likely to cause scratches on the recording medium, resulting in poor durability.

[Object of the Invention] The present invention was made in view of the current situation, and is a method for recording and reproducing information on a thin-film magnetic recording medium having a recording layer made of a metal thin film whose main component is a highly durable ferromagnetic metal. It is intended for magnetic recording and reproducing methods.

[Structure 9 of the Invention] That is, the present invention provides a magnetic recording medium having a ferromagnetic metal thin film layer made of metals such as iron, cobalt, nickel, or alloys thereof on a substrate, and a cobalt-based alloy having perpendicular magnetic anisotropy. Gold nHII for perpendicular recording made of thin film, etc.! layers, or iron, permalloy.

In a thin film type magnetic recording medium such as one in which a gold R thin film layer for perpendicular recording as described in IyJ is sequentially formed on a metal layer having high magnetic permeability such as a cobalt-niobium-zircon alloy, the metal thin film A layer on which a cobalt oxide image III made of CoO is provided is used.

Here, the cobalt oxide image vJWI made of CoO is preferably transparent! more preferably, the magnetic layer has (111) plane orientation.

CoO of cobalt oxide targets cobalt metal,
Sputtering method under oxidizing gas atmosphere as evaporation source,
It is formed by a vacuum evaporation method or the like.

Auger electron spectroscopy (AES) and X-ray diffraction (DX) were used to analyze CoO, which is a cobalt oxide.

As a magnetic recording head, a part of the slider that forms the sliding surface with the magnetic recording medium is made of high hardness (Vickers hardness 190).
0 to 2300), made of dense titanium carbide-containing alumina ceramics (AlI30s TiC: alumina titanium carbide), and
Recording and reproduction are performed in combination with an 18I type magnetic recording medium provided with an oO cobalt oxide protective layer.

The present invention combines a magnetic recording medium in which a CoO cobalt oxide protective layer is provided on a magnetic recording layer made of a ferromagnetic metal thin film, and a magnetic recording head in which a magnetic rod is sandwiched between alumina titanium carbide. This was the first to realize a highly durable magnetic recording and reproducing system for thin-film magnetic recording media.

Examples of the present invention are shown below.

FIG. 1 shows an example of the configuration of the perpendicular recording system of the present invention, in which 10 is a flexible double-sided perpendicular magnetic recording medium for a floppy disk, and 20 is a known main pole excitation type perpendicular magnetic recording head. . The perpendicular magnetic recording medium 10 has a base 11 made of a polyethylene terephthalate film with a thickness of 50μTn, and on both sides thereof a high magnetic permeability metal 111 layer 12 made of a 0.4μ nickel iron alloy and a cobalt chromium (chromium) with a thickness of 0.4μ711. : 20wt%) perpendicular magnetic recording layer 13 made of an alloy thin film according to Japanese Patent Application Laid-Open No. 57-1006.
The layers were sequentially laminated using the same facing target sputtering method as in Publication No. 27, and then 3 layers were further layered using the known reactive sputtering method in an oxidizing gas atmosphere using cobalt metal as a target.
A floppy disk was made by punching out a protective layer 14 made of cobalt oxide (CoO) to a diameter of 5.25 inches.

on the other hand! l! The direct magnetic recording head 20 has a main magnetic pole 2 made of a thin film of permalloy (nickel/iron) with a width of 300 μm and a thickness of 1 μm.
1 is supported by a manganese-zinc ferrite core 22 and wound with an excitation coil 23, and furthermore, a slider part 24 made of alumina-titanium carbide is provided on the surface that grips the tip of the main magnetic pole 21 and slides on the medium. (Example)

Further, the surface of the slider portion 24 is polished to a curvature of 50 mR.

As a comparative example, f! The direct magnetic recording medium has the same configuration as in the example, but only without the protective layer, and the head has the same configuration as in the example, but the slider part 24 is made of optical glass (BK).
7) A product using barium titanate was prepared and its durability was evaluated along with the examples.

Durability evaluation was performed by checking the roughness of the surface of the medium and head before and after a sliding test in which the medium to be evaluated was set in a disk drive with the head to be evaluated and rotated 10 million times at 300 rpm +++. Specifically, the surface roughness of the media before and after the sliding test was measured using a surface roughness meter (SUR).
Center line average roughness C using FCOM, manufactured by Tokyo Seimitsu ■
LA), and the CLA value of Tameishun is calculated as the CLA of the decoy surface.
On the other hand, for the head, the surface of a portion of the slider after the sliding test was measured using the surface roughness meter, and the maximum wear depth was determined using the relative surface roughness divided by the value. The results obtained are shown in the table on the next page.

As is clear from the table, the protective layer of the medium made of cobalt oxide CoO of the present invention and the part of the slider of the head are covered with alumina.
The combination using titanium carbide does not change the surface roughness of the media, there is no scratch on the slider part of the head, and it is 100%
There was almost no deterioration in the 00,000-pass sliding test, which was the best result compared to any of the comparative examples, and showed high durability.

Incidentally, the present invention covers the floppy disk and perpendicular magnetic recording medium shown in the examples.

It is not limited to the perpendicular magnetic recording method using a perpendicular head, and so-called hard disks such as aluminum disks treated with alumina oxidation, l! Application to 1-ki tape, iron,
Needless to say, the present invention can also be applied to a longitudinal magnetic recording system that combines a ring head with a longitudinal magnetic recording medium made of a thin film layer of a ferromagnetic metal such as cobalt or nickel.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one configuration example of the present invention. 10: Flexible perpendicular magnetic disk, 20: Perpendicular magnetic recording head, 11: 1 body, 12: High magnetic permeability metal thin layer, 13: Cobalt-chromium gold 11 layer, 14: CoO protective layer, 21: Main pole, 22 : core,
23: Excitation coil, part of 24 Nislider

Claims (1)

[Claims] 1) forming a recording layer made of a ferromagnetic metal thin film on a substrate;
It is characterized by performing magnetic recording and reproducing using a magnetic recording medium having a cobalt oxide protective layer made of CoO on the recording layer and a magnetic recording head whose sliding surface is made of alumina ceramics containing titanium carbide. A magnetic recording method. 2) The magnetic recording system according to claim 1, wherein the recording layer is a perpendicular magnetic recording layer. 3) The magnetic recording system according to claim 2, wherein the perpendicular magnetic recording layer is made of an alloy thin film containing cobalt-chromium as a main component.