JPH02201701A - Magnetic recording and reproducing method, magnetic recording medium and floating type magnetic head - Google Patents

Abstract

PURPOSE:To form a thin and uniform film and to prevent the generation of a stick slip and the attraction of the magnetic head to a magnetic recording medium by using alochol having <30 deg.C m. p. to form a protective lubricating film. CONSTITUTION:The protective lubricating film 11 contg. the alcohol having <30 deg.C m. p. is provided on the magnetic layer of the magnetic recording medium and/or at least the floating surface of the floating type magnetic head 1. The coefft. of friction between the magnetic recording medium and the magnetic head 1 is lowered in this way and the fluctuation of the friction is decreased. The stick slip during the durable travel is hardly generated in this way and the failure of the medium and head and the generation of the attraction of the head to the medium surface at the time of contact of the magnetic head with the medium are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a magnetic recording medium and a magnetic head having a protective lubricating film having lubricating and protective effects, and a magnetic recording and reproducing method using these.

<Prior Art> A hard type magnetic disk in which a magnetic layer is formed on a rigid substrate and a floating magnetic head are used in magnetic disk drives used in computers and the like.

Conventionally, coated magnetic disks have been used in such magnetic disk drive devices, but as the capacity of magnetic disks increases, sputtering methods, etc. Thin-film magnetic disks having a continuous thin-film magnetic layer formed by a vapor phase deposition method or the like have come to be used.

Thin-film magnetic disks are made by plating a N1-P underlayer on a Δβ-based disk-shaped metal plate, or by oxidizing the surface of this metal plate to form alumite. It is generally constructed by sequentially depositing a Cr layer, a metal magnetic layer such as Go-Ni, and a protective lubricant film such as C by sputtering.

However, metal magnetic layers such as Co-Ni have low corrosion resistance (and even lower hardness, causing reliability problems). The magnetic thin film, which is the main component, is chemically stable, so there is no fear of corrosion, and it also has sufficient hardness.

On the other hand, a flying type magnetic head is a magnetic head having a slider that generates buoyancy, and a composite type in which the core is integrated with the slider, or a monolithic type in which the core also serves as a slider is usually used.

Furthermore, in addition to these, so-called thin-film floating magnetic heads are attracting attention because they are capable of high-density recording. A thin-film floating magnetic head has a magnetic pole layer, a gap layer, a coil layer, etc. formed on a base by a vapor phase deposition method or the like. In such a thin-film type floating magnetic head, the base body is loose as a slider.

In these floating magnetic heads, the slider is made of various ferrites, AβxOzT i C1ZrO2,
It is composed of various ceramics such as SiC and AIN.

In a magnetic disk device using a floating magnetic head, the floating surface of the floating magnetic head (the surface of the slider on the magnetic disk side) comes into contact with the magnetic disk during contact start/stop (C3S). At this time, the magnetic disk and the floating magnetic head are likely to be scratched or damaged, or the floating magnetic head is likely to be attracted to the magnetic disk. For this reason, proposals have been made to provide various protective films or lubricant films on the surfaces of magnetic disks or magnetic heads.

In particular, since iron oxide has higher hardness than metals such as Co-Ni, in a magnetic disk having an iron oxide magnetic layer as described in JP-A No. 62-43819, even if there is a lubricating film on the surface of the magnetic disk. Or even if a protective film is provided, the head floating surface is easily scratched due to repeated C8S.
Furthermore, friction between the head and the disk tends to increase. Therefore, in such a combination, care must be taken in selecting the materials constituting the lubricating film or the protective film.

In addition, magnetic disks with iron oxide magnetic layers and Mn-Zn
When used in combination with a floating head having a ferrite base, such problems become even more pronounced because the hardness of Mn--Zn ferrite is lower than that of iron oxide.

Furthermore, for thin-film magnetic disks having an iron oxide magnetic layer, Al, which has higher hardness than Mn-Zn ferrite,
When using a floating magnetic head having a substrate of 0s-TiC, ZrO2, SiC, AρN, etc., the above-mentioned problems are solved to some extent, but in the combination of such a magnetic disk and floating magnetic head, the magnetic layer and the slider both have high hardness, which requires higher lubrication and protection effects. In particular, when a thin-film floating magnetic head is used for high-density recording, the above problem becomes more pronounced.

In other words, in a magnetic disk drive device that uses a thin-film floating magnetic head, the distance between the magnetic disk and the magnetic head (flying bite) can be set extremely small in order to perform high-density recording. This is because contact accidents between the magnetic disk and the flying magnetic head may occur due to impacts from outside the device, and if the flying hide is small, the damage to the magnetic head and magnetic disk during C8S will be greater.

In particular, a magnetic disk having a magnetic thin film mainly composed of iron oxide, as described in JP-A No. 62-43819, uses a glass substrate with a mirrored surface, and the surface of the magnetic layer is The roughness is extremely small.

Therefore, if a suitable protective film is not selected, the friction between the magnetic disk and the magnetic head will be large (this will cause problems such as stick-slip or adsorption of the magnetic head during C8S etc.). Therefore, even in such a combination, care must be taken in selecting the materials constituting the lubricating film or protective film.

Various lubricants are used in protective lubricant films provided on the above-mentioned flying magnetic heads and magnetic recording media.

The friction between the recording medium and the magnetic head fluctuates significantly,
This is undesirable because stick-slip is likely to occur.

An object of the present invention is to reduce the friction between the magnetic recording medium and the magnetic head, and to minimize its fluctuation during endurance running.
In other words, magnetic recording media and magnetic heads that are less likely to cause stick-slip, less likely to cause the magnetic head to be attracted to the magnetic recording medium, and less likely to cause scratches or damage to the magnetic head and the magnetic recording medium, and magnetic recording and reproduction using these. The purpose is to provide a method.

<Problems to be Solved by the Invention> However, a sufficient protective lubricating effect cannot be obtained with the conventional fluorine-based high molecular weight type protective lubricating film.

Further, with conventional protective lubricant films, it is difficult to form a thin and uniform film on a magnetic recording medium or a magnetic head. Means for Solving the Problem of Magnetism During Travel> Such objects are achieved by the present invention as described in (1) to (10) below.

(1) A method for recording and reproducing information on a magnetic recording medium having a magnetic layer on a rigid substrate using a floating magnetic head, the method comprising: on the magnetic layer and/or at least on the floating surface of the floating magnetic head; A magnetic recording and reproducing method characterized by comprising a protective lubricant film containing alcohol having a melting point of less than 30°C.

(2) The magnetic recording and reproducing method according to (1) above, wherein the floating magnetic head is a thin film floating magnetic head.

(3) The magnetic layer is a magnetic thin film containing iron oxide as a main component, and at least the floating surface of the floating magnetic head is made of a ceramic material having a Vickers hardness of 1000 or more. 2) The magnetic recording and reproducing method described in 2).

(4) The distance between the surface of the magnetic layer and the floating surface of the floating magnetic head is 0. The magnetic recording and reproducing method according to any one of (1) to 3) above, wherein ll1I11 or less.

(5) A magnetic recording medium having a magnetic layer on a rigid substrate, wherein the magnetic layer is a magnetic thin film containing iron oxide as a main component, and a protective layer containing alcohol with a melting point of less than 30° C. on the magnetic layer. A magnetic recording medium characterized by having a lubricating film.

(6) The magnetic recording medium according to (5) above, wherein the rigid substrate is made of glass.

(7) At least the levitation surface is made of a ceramic material having a Vickers hardness of 1000 or more, and at least the levitation surface has a protective lubricant film containing alcohol with a melting point of less than 30°C. type magnetic head.

(8) The above (7), wherein the ceramic material is a ceramic whose main component is Al2O3TiC, a ceramic whose main component is Z r O2, a ceramic whose main component is SiC, or a ceramic whose main component is Aj2N.
The magnetic head described in .

(9) The magnetic head according to (7) or (8) above, wherein the ceramic material is a ceramic whose main component is Aβ203-TiC, a ceramic whose main component is SiC, or a ceramic whose main component is AlN.

(10) The above (7) or 9), wherein the ceramic material is a ceramic whose main component is 8β203TiC.
A magnetic head according to any of the above.

Effect> In the present invention, a protective lubricant film containing alcohol having a melting point of less than 30° C. is provided on the magnetic layer of the magnetic recording medium and/or on at least the floating surface of the floating magnetic head. For this reason, the coefficient of friction between the magnetic recording medium and the magnetic head is low, and there is little variation in friction, so stick-slip is less likely to occur during endurance running, and damage to the medium and head occurs when the magnetic head contacts the medium. , the head is less likely to stick to the media surface.

In particular, when the magnetic layer of the magnetic recording medium is mainly composed of iron oxide and the base of the magnetic head is made of a ceramic material with a Vickers hardness of 1000 or more, the hardness of the magnetic layer and the magnetic head is Since the difference is small and the frictional force is constantly stable, stick-slip does not occur during endurance running, and both the magnetic layer and the magnetic head are less likely to be damaged.

Furthermore, since alcohol with a melting point of less than 30° C. is used in the protective lubricant film used in the present invention, a thin and uniform film can be formed. Therefore, frictional fluctuations during running or after endurance running are reduced, and good recording and reproducing can be performed.

Specific Structure> In the present invention, a protective lubricant film is provided on the magnetic layer of the magnetic recording medium and/or at least on the floating surface of the floating magnetic head.

Alcohol having a melting point of less than 30° C. is used for this protective lubricating film. Examples of such alcohols include the following.

As a monohydric saturated alcohol, CHa (CH,),,0H CH3 (CH2)90H etc.

As a monovalent unsaturated alcohol, C,, H, r, OH (oleyl alcohol) C,, H,
mOH C, 8H3, OH C, 2H2, OH C,, H2So H, etc.

Polyhydric natural alcohol.

As a synthetic alcohol, Dohanor 23 dohanol 25 Dohanol 45 Oxocol 1213 Oxocol 1215 Oxocol 1415 alhol 1214 etc.

Among these, monovalent saturated or unsaturated alcohols are preferred, and linear monovalent saturated or unsaturated alcohols are more preferred.

One or more of the above alcohols are used for the protective lubricant film. Therefore, a uniform thin film can be formed.

In the present invention, the thickness of the protective lubricating film is preferably about 4 to 300 layers. If there are fewer than 4 people, sufficient effects of the present invention cannot be obtained and the durability is especially poor, and if more than 300 people are involved, adhesion may occur and the magnetic head may crash. In addition, the more preferable film thickness is 4 to 100 people,
A more preferable film thickness is 4 to 80 people, an even more preferable film thickness is 5 to 40 people, and an even more preferable film thickness is 10 people.
~30 people. In particular, those consisting of a monomolecular layer are preferred.

There is no particular restriction on the method of forming the protective lubricating film of alcohol having a melting point of less than 30° C., and for example, a coating method may be used.

When using the coating method, the coating solution is hydrocarbon-based (
xylene, benzene, etc.), halogenated hydrocarbons (chlorinated solvents such as chloroform, fluorinated solvents such as CFCs, etc.), nitrated hydrocarbons (trobenzene, etc.), alcohols (ethyl alcohol, methyl alcohol, propyl (alcohols, etc.), ketones (acetone, etc.), heterocyclic compounds (quinoline, etc.), amines, ethers, esters, acids, etc.

Further, as the coating method, spin cord, dipping, spray coating, etc. may be selected as appropriate.

Further, the protective lubricant film of the present invention may contain other compounds in addition to the above-mentioned alcohol.

In this case as well, the method for forming the protective lubricant film is not particularly limited, and may be appropriately selected from the Langmuir-Prodgett (LB) method, the coating method, and the like.

For example, when using the LB method, the adherend substrate (magnetic recording medium or floating magnetic head) is immersed in an aqueous phase. Next, a predetermined amount of a developing solution containing a predetermined alcohol or compound is uniformly dropped onto the aqueous phase to develop a monomolecular film.

Next, after compressing the gas-liquid interface until the surface pressure reaches a predetermined tension, the adherend substrate is lifted almost vertically out of the aqueous phase at a predetermined speed without compressing the interface to maintain a constant pressure. Then, transfer the monomolecular film onto the adherend substrate. Next, the attached water is dried as necessary. Furthermore, if necessary, a cumulative film is obtained by repeating the same operation.

The cumulative number is preferably about 1 to 20 layers, more preferably about 1 to 5 layers, particularly preferably one layer, that is, a monomolecular layer.

Note that the surface of the adherend substrate may be treated to make it hydrophobic or hydrophilic, and an organic film may be formed thereon by the LB method.

Hydrophobic treatment can be carried out by the LB method, gas phase method, etc.
In this case, it is preferable to use one or more of fatty acids, esters, alcohols, etc. Further, when performing parent wood treatment on the substrate, it may be performed by a plasma method, a sputtering method, a solvent, ion bombardment, reverse sputtering, or the like.

As the solvent for the solution developed in the LB method, the solvent used in the coating method described above can be used.

The magnetic recording medium used in the present invention has a thin magnetic layer on a rigid substrate. There are no particular restrictions on the magnetic layer (,
Although the present invention is effective for both known coated magnetic layers and continuous thin film magnetic layers, the present invention is particularly effective for continuous thin film magnetic layers containing iron oxide as the main component. Show effectiveness.

A magnetic recording medium having a continuous thin film type magnetic layer containing iron oxide as a main component will be described below.

There is no particular restriction on the material of the rigid substrate, but the present invention eliminates the need to provide a base layer (the manufacturing process is simple, polishing is easy, and the surface roughness can be easily controlled). It is preferable to use glass.

As the glass, it is preferable to use tempered glass.

As such glass, Japanese Patent Application Laid-Open No. 62-43819
Examples include surface-strengthened glass as described in Japanese Patent Publication No.

The surface roughness (Rmax) of the rigid substrate is preferably 100 Å or less. Such surface roughness is, for example,
It can be obtained by mechanochemical polishing as described in JP-A-62-43819. Note that Rmax is more preferably 50 Å or less. In the present invention, since the thin film magnetic layer is directly formed on this substrate, the surface roughness of the magnetic layer is approximately equal to the surface roughness of the substrate. If the surface roughness of the substrate is within the above range, recording and reproduction can be performed while maintaining the distance between the magnetic layer surface and the floating surface of the floating magnetic head at 0.1 μm or less, making high-density recording possible. Become. In addition, since the present invention has the aforementioned protective lubricant film on the magnetic layer and/or the floating surface of the magnetic head, even if the medium and the magnetic head come into contact, the magnetic head will not be attracted or the surface of the medium and the magnetic head will be scratched. do not have.

The material of the glass substrate is not particularly limited and can be appropriately selected from glasses such as borosilicate glass, aluminosilicate glass, quartz glass, and titanium silicate glass. However, when smoothing the surface by mechanochemical polishing as described in JP-A-62-43819, it is preferable to use glass that does not contain crystalline materials. This is because the grain boundaries are relatively polished by mechanochemical polishing, making it impossible to achieve the above-mentioned Rmax.

There are no particular restrictions on the shape and dimensions of the rigid substrate, but typically
It is disk-shaped, and has a thickness of about 0.5 to 5 mm and a diameter of about 25 to 300 mm.

A magnetic thin film containing iron oxide as a main component is formed on the rigid substrate to form a magnetic layer.

The thickness of the magnetic layer is set at 50 mm in consideration of productivity, magnetic properties, etc.
It is preferable to set the number to about 0 to 3000 people.

Although the magnetic layer may be formed by a known vapor phase deposition method, it is preferable to use a sputtering method, particularly a reactive sputtering method.

Note that the magnetic layer may contain Ar or the like contained in the film-forming atmosphere.

The surface roughness of the magnetic layer thus obtained is approximately equal to that of the rigid substrate.

The magnetic layer formed in this way is described in Japanese Patent Application Laid-open No. 62
It is described in the publication No.-43819.

In addition to such a method, in the present invention, the magnetic layer may be formed by a method of forming a thin film mainly composed of iron oxide by vapor deposition or plating, or by a method of performing heat treatment after forming the thin film.

The aforementioned protective lubricant film is formed on such a magnetic layer.

Note that after forming a protective lubricant film on the magnetic layer, the protective lubricant film may be polished.

In the present invention, in addition to such a continuous thin-film magnetic recording medium containing iron oxide as a main component, a continuous thin-film magnetic recording medium having a metal vapor-phase grown film magnetic layer such as Co-Ni or a metal plating demagnetizing layer can be used. Media or known coated magnetic recording media using iron oxide are also suitable.

Next, the magnetic head of the present invention will be explained.

The magnetic head of the present invention has the aforementioned protective lubricant film on its front surface (floating surface).

The magnetic head of the present invention exhibits high effects when applied to a floating magnetic head used in combination with a hard type magnetic recording medium.

The present invention provides a known composite type floating magnetic head,
Although it is highly effective even when applied to a monolithic floating magnetic head, it is particularly effective when applied to a thin film floating magnetic head.

The thin film type floating magnetic head will be explained below.

FIG. 1 shows a thin film floating type magnetic head which is a preferred embodiment of the magnetic head of the present invention.

The floating magnetic head 1 shown in FIG.
Insulating layer 31, bottom pole layer 41, gap layer 5, insulating layer 3
3. It has a coil layer 6, an insulating layer 35, an upper magnetic pole layer 45, and a protective layer 7 in this order.

In the present invention, the above-mentioned protective lubricant film 11 is provided on at least the front surface, that is, the floating surface, of such a floating magnetic head 1.

There are no particular restrictions on the material of the coil layer 6, and commonly used metals such as Af2 and Cu may be used.

There are no restrictions on the winding pattern or winding density of the coil, and known patterns may be appropriately selected and used. For example, the winding pattern may be a spiral type as shown in the figure, a laminated type, a zigzag type, or the like.

Moreover, various vapor phase deposition methods such as sputtering and plating may be used to form the coil layer 6.

The base body 2 is made of a known material such as Mn-Zn ferrite.

When the magnetic head of the present invention is used for a magnetic recording medium having a continuous thin film type magnetic layer mainly composed of iron oxide,
The base body 2 is preferably made of a ceramic material having a Vickers hardness of 1000 or more. With this configuration, the effect of the magnetic head of the present invention becomes even more remarkable.

Ceramic materials with a Vickers hardness of 1000 or more include ceramics containing Aβ20aTic as a main component, Z
Ceramics containing rOx as a main component, ceramics containing SiC as a main component, or ceramics containing Al2N as a main component are suitable. Moreover, these may contain Mg, Y, ZrO2, TiO2, etc. as additives.

Among these, those particularly suitable for the present invention are A I22
Ceramics whose main component is 0 a T i C, S
Ceramics containing iC as a main component or ceramics containing A42N as a main component are the most preferred among these, since they have the best relationship with the hardness of the thin film magnetic layer containing iron oxide as a main component. It is a ceramic whose main component is *O*TiC.

As the material for the lower and upper magnetic pole layers 41, 45, any conventionally known material can be used, such as permalloy, sendust, Co-based amorphous magnetic alloy, etc.

The magnetic poles are usually provided as a lower magnetic pole layer 41 and an upper magnetic pole layer 45 as shown in the figure, and a gap layer 5 is formed between the lower magnetic pole layer 41 and the upper magnetic pole layer 45.

The gap layer 5 may be made of various known materials such as Al2203 and SiO□.

The patterns, film thicknesses, etc. of the pole layers 41, 45 and the gap layer 5 may be any known ones.

Furthermore, in the illustrated example, the coil layer 6 is of a so-called spiral type, with upper and lower magnetic pole layers 41 and 45 spirally arranged.
An insulating layer 33.35 is provided between the coil layer 6 and the upper and lower magnetic pole layers 41.45.

Further, an insulating layer 31 is provided between the lower magnetic pole layer 41 and the base body 2.

As the material for the insulating layer, any conventionally known material can be used. For example, when producing a thin film by sputtering, 5in2. Glass, AI2.03, etc. can be used.

Further, a protective layer 7 is provided on the upper magnetic pole 45 .

As the material for the protective layer, any conventionally known material can be used, such as A.degree. C. 20S. Further, various resin coat layers or the like may be laminated thereon.

The manufacturing process of such a floating magnetic head is usually performed by forming a thin film and forming a pattern.

As described above, the thin film of each layer may be formed by using a conventionally known technique such as a vapor deposition method such as a vacuum evaporation method, a sputtering method, or a plating method.

Pattern formation of each layer of the floating magnetic head can be performed by selective etching or selective deposition, which are conventionally known techniques.

Etching can be performed by wet etching or dry etching.

Further, the protective lubricant film 11 may be formed by the method described above.

A floating magnetic head on which a protective lubricant film is formed is used in combination with a conventionally known assembly such as an arm.

<Example> Hereinafter, the present invention will be specifically explained with reference to Examples.

[Example 1] <Formation of magnetic head> A thin film was formed on an Al2203-TiC substrate by sputtering, and a pattern was formed by dry etching to obtain a magnetic head as a slider structure. This Al
The Vickers hardness of the 2O3-TiC substrate was 2200.

Formation of a protective lubricant film on the magnetic head When forming a protective lubricant film on the magnetic head, a linear alcohol having a melting point of less than 30° C. was used as follows.

After pattern formation by dry etching, a protective lubricant film was formed at least on the floating surface (front surface).

Table 1 shows the composition of alcohol and other compounds constituting the protective lubricant film, as well as the method and thickness of the protective lubricant film. In addition, when the protective lubricant film is formed by the LB method,
The cumulative number of LB films is also listed. In addition, the film thickness is measured by E
This was done by SCA.

Further, details of the protective lubricant film forming method shown in Table 1 are as follows.

(LB method) A 10-4 mol/I2 chloroform solution of the compound shown in Table 1 was prepared and used as a developing solution.

First, the substrate to be processed (magnetic head) is immersed in the aqueous phase, and then uniformly dropped onto the surface of the aqueous phase, which is a developing solution.
A monolayer was developed.

Next, the interface is compressed until the surface pressure reaches a predetermined pressure, and the substrate to be processed is raised almost vertically at a constant speed to transfer the monomolecular film onto the substrate to be processed, and then the substrate to be processed is lowered and raised. This process was repeated to accumulate a monomolecular film, forming a protective lubricant film.

(Coating method) A chloroform solution of the compound shown in Table 1 was used as a coating solution. The concentration was 0.1 wt% for dipping and 0.2 wt% for spin code.

The thus produced magnetic head was combined with an arm to produce an air bearing type floating magnetic head.

<Formation of magnetic disk> An aluminosilicate glass plate having an outer diameter of 130 mm, an inner diameter of 40 mm, and a thickness of 1.9 mm was chemically strengthened. The chemical strengthening treatment was performed by immersing it in molten potassium nitrate at 450°C for 10 hours.

Next, the surface of this glass plate was smoothed by mechanochemical polishing to obtain a magnetic disk substrate. A polishing liquid containing colloidal silica was used for mechanochemical polishing. Surface roughness of magnetic disk substrate (Rma
x) was 90 people.

Next, with Fe as the target, Ar: 0, = 50:
Reactive sputtering was performed in an atmosphere of 10-'' Torr at 50° C. to form a 2000 .alpha.-Fe2eg film.

Next, reduction treatment was performed at 360°C for 2 hours in a hydrogen stream to form a Fe5O4 film, and then 1 hour was performed at 310°C in air.
Time oxidation was performed to obtain a γ-Fe*Os magnetic layer.
The Rmax of this magnetic layer was 100 people.

<Formation of a protective lubricant film on a magnetic disk> A magnetic disk was prepared by forming a protective lubricant film on the magnetic layer of the magnetic disk.

Table 1 shows the compounds constituting the protective lubricant film, the method of forming the protective lubricant film, and the film thickness.

The film forming method shown in Table 1 is the same as that for the magnetic head described above.

The floating magnetic heads and magnetic disks obtained as described above were combined as shown in Table 1, and the friction and adhesion between the floating magnetic heads and the magnetic disks at the initial stage and after running for a long time were measured. Endurance running at 20℃, 60%R
The test was carried out under the conditions of 1100 rpm for 30 minutes under indirect contact conditions, and the friction was expressed as the coefficient of kinetic friction when rotating at 1 rpm.

The results are shown in Table 1.

[Comparative Example 1] A magnetic disk having a protective lubricant film composed of a compound represented by the following formula (I) and a floating magnetic head without a protective lubricant film were manufactured according to Example 1. .

Formula (I) Regarding these, measurements similar to those in Example 1 were performed.

The results are shown in Table 1.

In addition, when we observed scratches on the magnetic disk surface and floating surface of the floating magnetic head after endurance running using an optical microscope with a magnification of 100 times, no scratches were observed on either of the combinations in Example 1. In both comparative examples, scratches were observed.

[Example 2] Using a magnetic disk having a protective lubricant film on the magnetic layer on the γ-Fe20 fabricated in Example 1 and a floating magnetic head having a protective lubricant film on the Ac103T i C substrate, a flying bite of 0.1 μm was applied. 5 at 3600 rpm below
A minute-long high-speed sliding test was conducted.

After the high-speed sliding test, scratches on the magnetic disk surface and floating surface of the floating magnetic head were observed using a 100x optical microscope.

The results are shown in Table 2.

[Example 3] A N1-P underlayer was formed by plating on a codisc-shaped Aj2 plate, and on this underlayer, a Cr layer, a Co-Cr magnetic layer,
A hard type magnetic disk was manufactured by sequentially depositing a protective film made of carbon and the protective lubricant film used in Example 1 above.

In addition, Ac with a Vickers hardness of 2200 used in Example 1
20. Replaced with l-"ric substrate, Vickers hardness 700
The protective lubricant film used in Example 1 was formed on the Mn-Zn ferrite substrate to produce a thin-film floating magnetic head.

The thus obtained magnetic disk and flying magnetic head were combined and the same observations as in Example 2 were performed. Further, similar observations were made by combining this magnetic disk and floating magnetic head with the floating magnetic head and magnetic disk described in Example 2, respectively.

The results are shown in Table 2.

table combination No.

Floating magnetic head substrate Scratch Magnetic disk magnetic layer Scratch 1 No Aj2aO3TiC y FezO++
No 2 AL (h -Tic No C
o-Cr Yes 3Mn-Zn ferrite Yes y
Fe20s No 4Mn-Zn ferrite Yes
Co-Cr Yes In addition to these combinations, high-speed sliding tests similar to those in Example 2 were conducted using a floating magnetic head having an AρN base with a Vickers hardness of 2200 or more and a SiC base with a similar hardness. However, no scratches were observed. In addition, when similar measurements were performed using a floating magnetic head with a ZrO2 substrate with a Vickers hardness of 1300, slight scratches were observed on the floating surface of the magnetic head, but this was not a problem in practice. It was about.

The results are shown in Table 2. When the head flying height was set to 0.2- with the combination of No. 4 Mn-Zn ferrite and Co-Cr, there were no scratches on both the magnetic head and the magnetic disk. It was found that the present invention was effective.

[Example 4] A C8S test was conducted using the floating magnetic head and magnetic disk produced in Example 1, and very good results were obtained regarding friction fluctuations, adsorption, etc.

From the results of the above examples, the effects of the present invention are clear.

<Effects of the Invention> In the present invention, since alcohol having a melting point of less than 30° C. is used for the protective lubricating film, a thin and uniform film can be formed.

Therefore, according to the present invention, the friction between the magnetic recording medium and the magnetic head is small, and its fluctuation is small (therefore, stick-slip and adsorption of the magnetic head to the magnetic recording medium are less likely to occur).

Therefore, when running for a long time, stable running can be obtained, and it is possible to effectively prevent scratches and stick-slip on both the magnetic recording medium and the magnetic head.

In particular, when a magnetic recording medium having a magnetic layer containing iron oxide as a main component and a thin-film floating magnetic head having a base made of a ceramic material having a Vickers hardness of 1000 or more are used in combination, The effect is significant.

Explanation of symbols 1...Floating magnetic head 2...Base 31.33.35...Insulating layer 41...Lower magnetic pole layer 45...Top pole layer 5...Gap layer 6...Coil layer 7...Protective layer 11...Protective lubricant film

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing a thin film floating type magnetic head which is a preferred embodiment of the magnetic head of the present invention.

Claims (10)

[Claims] (1) A method for recording and reproducing information on a magnetic recording medium having a magnetic layer on a rigid substrate using a floating magnetic head, the method comprising: on the magnetic layer and/or at least on the floating surface of the floating magnetic head; A magnetic recording and reproducing method characterized by comprising a protective lubricant film containing alcohol having a melting point of less than 30°C. (2) The magnetic recording and reproducing method according to claim 1, wherein the floating magnetic head is a thin film floating magnetic head. (3) The magnetic layer is a magnetic thin film containing iron oxide as a main component, and at least the floating surface of the floating magnetic head is made of a ceramic material having a Vickers hardness of 1000 or more. The described magnetic recording and reproducing method. (4) The magnetic recording and reproducing method according to any one of claims 1 to 3, wherein the distance between the surface of the magnetic layer and the floating surface of the floating magnetic head is 0.1 μm or less. (5) A magnetic recording medium having a magnetic layer on a rigid substrate, wherein the magnetic layer is a magnetic thin film containing iron oxide as a main component, and a protective layer containing alcohol with a melting point of less than 30° C. on the magnetic layer. A magnetic recording medium characterized by having a lubricating film. (6) The magnetic recording medium according to claim 5, wherein the rigid substrate is made of glass. (7) At least the floating surface is made of a ceramic material with a Vickers hardness of 1000 or more,
A thin-film floating magnetic head, comprising a protective lubricant film containing alcohol having a melting point of less than 30° C. on at least the floating surface. (8) The ceramic material is Al_2O_3-TiC
Claim 7: A ceramic whose main component is ZrO_2, a ceramic whose main component is SiC, or a ceramic whose main component is AlN.
The magnetic head described in . (9) The ceramic material is Al_2O_3-TiC
9. The magnetic head according to claim 7, wherein the magnetic head is a ceramic whose main component is SiC, a ceramic whose main component is AlN, or a ceramic whose main component is AlN. (10) The ceramic material is Al_2O_3-Ti
Claims 7 to 9 are ceramics containing C as a main component.
A magnetic head according to any of the above.