JPS61267911A - Magnetic recording and reproducing system - Google Patents

Abstract

PURPOSE:To obtain a durable magnetic recording and reproducing device by combining a recording medium of a ferromagnetic metallic thin film on a substrate with a magnetic recording head formed with a ceramic polycrystalline sintered body contg. Si and having a sliding surface of 1,000-2,000 Vickers hardness. CONSTITUTION:A high-permeability thin film 12 of an Ni-Fe alloy having about 0.4mum thickness and a vertical magnetic recording layer 13 of a Cr alloy contg. 20wt% Co are successively deposited by sputtering on both surfaces of a film 11 of an org. resin and a Co3O4 film 14 is further laminated by reactive sputtering in an oxidizing gas with Co as the target. Besides, a vertical magnetic recording head 20 is formed by supporting a main pole 21 of 'Permalloy(R)' film with an Mn.Zn ferrite core 22, winding an exciting coil 23 and providing a slider 24 of SiC.ErO2, etc., of 1,500-2,000 Vickers hardness on the sliding surface with the medium with the tip of the main pole 21 in between. Magnetic recording and reproduction can be stably carried out by this constitution for a long period.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a method for recording and reproducing recorded information on a thin-film magnetic recording medium having a recording layer made of a thin film of gold steel whose main component is a ferromagnetic metal. More specifically, the present invention relates to a new magnetic recording and reproducing method that enables stable magnetic recording and reproducing over a long period of use.

[Prior art]

In recent years, the demand for high-density recording has become higher and higher, and as an alternative to the conventional coater using a binder, a method using a ferromagnetic metal thin film as the magnetic recording layer was introduced, ``For further improvement'', Japanese Patent Publication No. 5g = 91 was published. Thin-film magnetic recording media with a thin metal recording layer, such as those using a Huvard alloy thin film having perpendicular magnetic anisotropy, have been proposed, as shown in publications. If it is, the frictional resistance with the magnetic recording head is large, making it susceptible to wear and damage and lacking in durability.

For this reason, various proposals have been made in the past in which organic polymers, high-hardness metals, ceramics, etc. are further provided as protective layers on ferromagnetic metal thin films.

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. 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 , those that do not damage the medium, do not wear out the head sliding surface itself, and have a durability of 1n are used. However, unlike the above-mentioned coated media, which is impregnated with a lubricant or the like to improve durability, the thin film magnetic recording medium has a recording layer made of a thin film layer that does not absorb lubricants. Therefore, the magnetic recording head is easily damaged by sliding with the recording medium, and this damage also tends to cause scratches on the recording medium, resulting in poor durability.

[Purpose of the invention]

The present invention has been made in view of the current situation, and is a magnetic recording medium for recording and reproducing information on a thin magnetic recording medium having a recording layer made of a gold lA thin film mainly composed of a highly durable ferromagnetic metal. It is intended as a playback method.

[Structure and operation of the invention]

That is, the present invention combines a magnetic recording medium in which a recording layer made of a ferromagnetic metal thin film is formed on a substrate, and as an a-air head, a part of the slider that forms the sliding surface with the magnetic recording medium has a Vickers hardness of 1500. #I is characterized in that it is made of a polycrystalline sintered ceramic containing ~2000 silicon (Si) and is used to record and reproduce information on a magnetic recording medium.
There is a magnetic recording and reproducing method.

Specifically, Si3N4+SiC・8i+ is a polycrystalline sintered ceramic containing Si that satisfies the above conditions.
5IC-ErO, etc. are listed.

The magnetic head of the present invention is not limited in any way other than that the surface that slides on the medium is made of the above-mentioned ceramics, and can be any type of head, such as a normal ring head, a vertical head as shown in the embodiments described later, or a thin-film head. A magnetic head can be applied.

In addition, as a magnetic recording medium of the present invention, a thin I! recording layer is made of a ferromagnetic metal thin film. It is clear from its operation that there are no limitations as long as it is an x-type magnetic recording medium, and all known media for longitudinal and perpendicular magnetic recording can be applied. Typically, a ferromagnetic metal thin film layer made of metals such as iron, cobalt, nickel, or alloys thereof is placed on a substrate, and 14 thin metal layers for perpendicular recording made of a cobalt-based alloy thin film having perpendicular magnetic anisotropy are used. or iron, (-maloiya cobalt,
Examples include a magnetic recording medium having a metal layer having high magnetic permeability, such as a niobium-zircon alloy, and then the above-mentioned metal thin film layer for perpendicular recording formed thereon.

Note that preferably a protective layer is provided on the metal thin film layer. The protective layer is made of organic polymer, high hardness metal, and/or ceramics, etc., and I! This includes various proposals that have been made in the past, such as those described in JP-A-60-50622 and the like. Among these, metal oxides are preferred, and cobalt oxides are more preferred. Even more preferred is a cobalt oxide whose main component is CGno.

The present invention described above can achieve extremely high wear resistance only by combining a magnetic recording medium made of a ferromagnetic metal thin film and a magnetic head whose sliding surface is made of polycrystalline sintered ceramics containing Si. This is a realization of a magnetic recording and reproducing method for a thin a-orange magnetic recording medium.

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 numeral 10 denotes a flexible double-sided perpendicular magnetic recording medium for Flora Beatisf.

Reference numeral 20 denotes a known perpendicular magnetic recording head with main a1 pole excitation and a1 axis. The perpendicular magnetic recording medium 10 has a base 11 made of a polyethylene terephthalate film with a thickness of 50 μm, and has a thin metal layer 12 of high permeability made of a nickel-iron alloy with a KO of 04 μm on both sides, and a cobalt chromium (chromium) film with an I O of 4 μm. A perpendicular magnetic recording layer 13 consisting of an alloy thin film of 20 wt. 14 was laminated and punched out to a diameter of 5.25 inches to form a floppy disk.

-1 perpendicular magnetic recording head 20 has a width of 300 μml and a thickness of 1
μm permalloy (nickel, iron) ~ N' Thin film main magnetic pole 21 is made of manganese zinc ferrite 72
2 and around which an excitation coil 23 is wound.
A polycrystalline ceramic containing various kinds of Si having a Vickers hardness of 1500 to 2000, specifically SiC/ErO, (Example 1) *SiC/ 8i (Example 2) +
Various types of slider portions 24 made of 5iaN* (Example 3) were prepared and evaluated. Note that the surface of the slider portion 24 is polished to a curvature of 50 a+H. In addition, 5IC-KrO, + SiC・8 used in the example
The porosity of 1+Si and N4 was all 0.2% or less.

As a comparative example, a head with the same configuration as in the example was created using titanium barium (comparative example 1) and glass (BK7) (comparative example 2) as the material of the slider part 24. We conducted an evaluation.

For durability evaluation, set the media to be evaluated in the disk drive with the head to be evaluated, and run the media at 300 rpm for 3 seconds.
The roughness of the surface of the medium and head before and after a sliding test of 1,000,000 rotations was conducted. Specifically, the surface roughness of the media before and after the sliding test was measured using a surface roughness meter (SURFC).
OM, manufactured by Tokyo Seimitsu ■) to obtain center line average roughness CLA
), and from the relative surface roughness K obtained by dividing the CLA value after sliding by the CLA value before sliding, on the other hand, when the head is busy, the surface of a part of the slider after the sliding test is measured using the surface roughness meter. The maximum wear depth was determined by measuring the maximum wear depth. The results are shown in the table below.

As is clear from the table, part of the head slider of the present invention KS
The combination of polycrystalline sintered ceramics including The results were better than any of the examples and showed high durability.

Note that the present invention is not limited to the floppy disk, perpendicular magnetic recording medium, and perpendicular magnetic recording layer type using a perpendicular head shown in the embodiments.
Applicable to so-called hard disk I magnetic tapes such as aluminum oxide treated with alumina oxidation, and also to longitudinal magnetic recording systems that combine a ring head with a longitudinal magnetic recording medium made of a thin film layer of ferromagnetic metal such as iron, cobalt, or nickel. It goes without saying that it can be applied @

[Brief explanation of drawings]

FIG. 111 is an explanatory diagram of one example of the bottom structure σ of the present invention. 10: flexible perpendicular magnetic disk, 20: perpendicular magnetic recording head, 11: & body. ]2: High magnetic permeability metal thin layer, 13: Cobalt-chromium metal thin layer, l4: Cobalt oxide protective layer,

Claims (1)

[Scope of Claims] 1) A magnetic recording medium in which a recording layer made of a ferromagnetic metal thin film is formed on a substrate, and a surface that slides on the magnetic recording medium contains silicon (Si) with a Vickers hardness of 1500 to 2000. A magnetic recording and reproducing method that performs magnetic recording and reproducing using a magnetic recording head made of ceramic, which is a crystalline sintered body. 2) The ceramic of the polycrystalline sintered body containing Si is
_3N_4, SiC/Si or SiC/ErO_2
A magnetic recording system according to claim 1. 3) The magnetic recording and reproducing system according to claim 1 or 2, wherein the magnetic recording medium is a recording medium in which a protective layer is provided on a recording layer. 4) The magnetic recording system according to claim 3, wherein the protective layer is made of a metal oxide.