JPH0668831B2 - Magnetic storage body and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic storage device used in a magnetic storage device such as a magnetic disk device and a magnetic drum device, and a method for manufacturing the same.

[Prior Art] Generally, there are roughly the following two types of recording / reproducing methods of a magnetic storage device having a recording / reproducing magnetic head (hereinafter referred to as a head) and a magnetic storage body as main components. That is, the first method is a method of creating a space corresponding to an air layer between the head and the surface of the magnetic memory at the start of the operation, and recording / reproducing in this state. In this method, the rotation of the magnetic storage body stops at the end of the operation, and at this time, the head and the surface of the magnetic storage body are in the contact friction state as at the start of the operation. The second method is to apply a required rotation to the magnetic storage medium in advance, and suddenly press the head against the surface of the magnetic storage medium to create a space corresponding to an air layer between the head and the surface of the magnetic storage medium. This is a method of recording and reproducing in the state.

As described above, in the first method, the head and the magnetic memory surface are in a contact friction state at the start and end of the operation, and in the second method, the head is in a contact friction state when the head is pressed against the magnetic memory surface. Therefore, in either case, a frictional force is generated between the head and the magnetic storage medium, and this frictional force may abrade the head and the magnetic storage medium, and eventually may damage the head and the metal magnetic thin film medium. Further, in the contact friction state, a slight change in the posture of the head may make the load applied to the head non-uniform, and may scratch the surface of the head and the magnetic memory. Further, the frictional force generated between the head and the magnetic memory in the contact friction state causes a large torque particularly when a large number of heads are mounted, and imposes an unfavorable burden on the motor for rotating the magnetic memory. Further, during recording / reproduction, the head suddenly contacts the magnetic storage body, a large frictional force acts between the head and the magnetic storage body, and the head and the magnetic storage body are often destroyed.

In order to protect the head and the magnetic storage body from the contact frictional force between the head and the magnetic storage body, a protective coating is applied to the surface of the magnetic storage body to reduce the contact friction force generated between the head and the magnetic storage body. Required to do so.

As one of the methods for this purpose, a lubricating layer is provided on the surface of the magnetic memory. This lubrication layer is
It is necessary to reduce the above-mentioned contact frictional force, and at the same time, the lubricating layer is removed from the underlayer, or the head floats during recording / reproduction by aggregating around the head or between the head and the magnetic memory body. It must be well bonded to the substrate so that stability is not adversely affected. Therefore, in order to reduce the above-mentioned contact frictional force, it is desirable that the lubricating layer has a non-polar molecular layer which is less likely to be adsorbed or adhered at the interface between the head and the magnetic storage medium. It is desirable to orient in the part that bonds with.

As such a lubricating layer, oils such as silicone oil, fluorine oil, fluorosilicone, and silicon chlorides or silazanes such as octadecyltrichlorosilane and hexamethyldisilazane have been proposed (JP-A-55-40932). .

[Problems to be Solved by the Invention] Although these lubricating layers each exhibit excellent properties, the oils do not have sufficient bonding force with the amorphous inorganic oxide that is the base material, and therefore, silicon chloride or In the silazanes, the molecular weight of the non-polar molecular layer, which is less likely to be adsorbed or adhered to the interface between the head and the magnetic memory, is not sufficient. Therefore, there has been a problem that the loss of the lubricant in oils after long-term use and the effect of reducing the contact frictional force generated between the head and the magnetic memory in silicon chlorides or silazanes are not perfect.

An object of the present invention is to provide a magnetic memory body and a method of manufacturing the magnetic memory body that solve this problem.

[Means for Solving the Problems] In the present invention, a metal magnetic thin film medium is coated on an alloy disk coated with a non-magnetic alloy layer having a mirror surface or on an alloy disk having a mirror surface. amorphous inorganic oxide layer is coated on, still in the magnetic storage body orientation lubricant is coated thereon, said orientation lubricant, the general formula _{HO- (CH 2) n -COOH [} I ] (N is an integer of 10 or more and 23 or less) A monolayer of an organic compound containing a substance represented by the formula:
The structural unit represented by C ₂ F ₄ O and the structural unit represented by the formula CF ₂ O are linearly and irregularly arranged, and the terminal group is represented by the formula O═C.
Is a polymer layer formed of a polymer having a molecular weight of 500 to 30,000 represented by the formula: = N-CF _2- , and a manufacturing method thereof is a nonmagnetic alloy layer having a mirror surface. A metal magnetic thin film medium is coated on an alloy disk or a metal alloy disk whose surface is a mirror surface, which is coated with an amorphous inorganic oxide layer, and further, on this amorphous inorganic oxide layer,
Directly or after said surface of the amorphous inorganic oxide layer was treated in a plasma, the general formula _{HO- (CH 2) n -COOH [} I] substances (n is 10 or more and 23 or less an integer) is represented by A monolayer of an organic compound containing is prepared and then a structural unit of formula C ₂ F ₄ O and a formula C
Structural units represented by F ₂ O are linearly and irregularly arranged, and end groups have a molecular weight of 500 to 3000 represented by the formula O = C = N-CF _2-.
The polymer layer is provided on the amorphous inorganic oxide layer by coating the polymer of No. 0 or baking after coating.

The gist of the present invention is to convert a substance having a hydroxyl group and a carboxyl group at both ends into an amorphous inorganic oxide layer of a carboxyl group or a metal salt thereof by a monomolecular film forming method such as Langmuir-Blodgett method. This is to form a monomolecular layer on the magnetic memory body coated with an oxide film by using the adhesive force of the above, and then apply a fluorine oil molecule having a functional group chemically bonded to a hydroxyl group at the end. That is, by using a monomolecular layer of a substance having a hydroxyl group and a carboxyl group at both ends as a binder that firmly binds the oxide film and the fluorine oil molecule, and by using the fluorine oil molecule having a larger molecular weight, The non-polar molecular layer, which is unlikely to be adsorbed or aggregated, is sufficiently interposed at the interface between the and to reduce the contact frictional force between the lubricating layer and the head.
It is important to use a monomolecular layer of a substance having a hydroxyl group and a carboxyl group at both ends as a binder, and to use a fluorine oil molecule having an isocyanate group chemically bonded to a hydroxyl group as a non-polar molecular layer.

The oxycarboxylic acid represented by the above general formula [I] acting as the binder of the present invention preferably has n in the range of 10 to 23 in order to form a good monomolecular film.

As a method for forming a monomolecular layer of the compound represented by the general formula [I] on the amorphous inorganic oxide layer, for example, the Langmuir-Blodgett method can be mentioned. At this time, by converting the hydroxyl group of the oxycarboxylic acid into a hydrophobic group in advance, the other functional group, the carboxyl group, is bonded to the amorphous inorganic oxide layer through a hydrogen bond or the like to form a strong monovalent group. A molecular film is formed. In addition, the carboxyl group may be left as it is, or a divalent metal ion such as cadmium or barium may be added to the aqueous phase used for adsorption by the Langmuir-Blodgett method to adsorb the above substance as a metal salt of carboxylic acid. You may let me.

In the present invention, in addition to the compound represented by the above general formula [I] as a constituent of the monomolecular film, a compound having a hydrophilic group and a hydrophobic group such as a long-chain alkylcarboxylic acid such as myristic acid is contained. However, in order to fully exhibit the action as a binder, it is desirable that the compound of the general formula [I] accounts for 10% by weight or more of the total organic compounds.

When the hydroxyl group is converted into a hydrophobic group, the monomolecular layer thus obtained is converted into a hydroxyl group again, and then a polymer having an isocyanate group is applied. This polymer has the formula
C ₂ F ₄ O and formula CF ₂ O are used as repeating units, but the ratio of these two units can be arbitrarily selected. The molecular weight of the polymer may be 500 or more, which is one repeating unit, and 30,000 or less, which is easy to synthesize and can be dissolved in a suitable solvent, and usually 1,000 to 10,000 is more preferably used.

In the present invention, the combination of the monolayer as the binder and the polymer layer can be firmly bonded to the base by using as the lubricating layer, but the base after forming the amorphous inorganic oxide is used. If the surface of the amorphous inorganic oxide layer is made more hydrophilic by implanting ions, the surface of the amorphous inorganic oxide layer becomes more hydrophilic if the lubricating layer is prepared after the treatment of the surface layer in plasma. The bond between the body and the lubricant becomes stronger.

Further, for recording and reproduction, it is advantageous that the spacing (the distance between the head and the magnetic memory at the time of recording and reproduction) is small. For this reason, it is desirable that the thickness of the lubricating layer be as thin as possible, but the monomolecular film and the polymer can form a very thin lubricating layer. After forming a monomolecular layer on the amorphous inorganic oxide and applying the polymer, a chemical reaction is caused to combine the monomolecular layer and the polymer, and then the monomolecular layer is formed by Freon washing. The extra unbonded lubricant is removed, forming a very thin lubricating layer.

[Function] The amorphous inorganic oxide is polysilicic acid or a sputtered film of SiO ₂ , glass, alumina or the like. The substance having a hydroxyl group and a carboxyl group at both ends of the present invention, if the hydroxyl group is temporarily converted into a hydrophobic group by a chemical method, the amorphous inorganic oxide of the above-mentioned amorphous inorganic oxide can be obtained by the Langmuir-Blodgett method. It can be strongly adsorbed as a monomolecular layer on the surface.
The monomolecular layer thus obtained is strongly bonded to the amorphous inorganic oxide layer due to the strong hydrophilicity of the carboxyl group or its metal salt. After the adsorption of this monolayer, the hydrophobic group, which had been temporarily converted to a hydroxyl group, is returned to the original hydroxyl group by a chemical method again. It can form a chemical bond with the fluorine oil molecule that it has, and can play the role of a binder that firmly bonds the amorphous inorganic oxide and the fluorine molecule. On the other hand, fluorine oil molecules reduce the surface energy and show an excellent lubricating effect. Therefore, by combining this monomolecular layer and the fluorine oil molecular layer, it is possible to obtain a magnetic memory body in which the underlayer and the lubricant layer are firmly bonded to each other and which has an excellent lubricating effect. The chemical reaction between the monolayer and the polymer proceeds naturally after coating, but it takes only a short time if baked.

[Examples] Hereinafter, the present invention will be described in detail with reference to Examples.

(Embodiment 1) FIG. 1 is a sectional view schematically showing the structure of a magnetic memory body of the present invention. In the drawings, the magnetic memory 7 of the present invention is
The alloy disk 1 is coated with the non-magnetic alloy layer 2, the polished surface of the coating is coated with the metal magnetic thin film medium 3, and the amorphous inorganic oxide 4 is further coated thereon. Is coated with a lubricant composed of the monomolecular film 5 and the polymer layer 6.

Nickel-phosphorus as the non-magnetic alloy layer 2 on the disk-shaped aluminum alloy substrate finished on the surface having a sufficiently small waviness (50 μm or less in both the circumferential direction and the radial direction) by lathe processing and heat correction as the alloy disk 1 Ni-
P) alloy is plated to a thickness of about 50 μm, and this Ni-P plated film is mechanically polished to a surface roughness of 0.04 μm or less and a thickness of about
After mirror-finishing to 30 μm, a cobalt-nickel-phosphorus (Co—Ni—P) alloy as a metal magnetic thin film medium 3 was plated thereon to a thickness of about 0.05 μm. Furthermore, this Co-Ni
On the -P alloy film, a solution having the composition shown below was sufficiently mixed, and dust or precipitated SiO ₂ was removed through a filtration film, and then applied by spin coating.

Tetrahydroxysilane 11% ethyl alcohol solution: 20
% By weight n-butyl alcohol: 80% by weight After that, the disc substrate was baked at a temperature of 200 ° C. for 3 hours C
A polysilicic acid film, which is an amorphous inorganic oxide 6, was formed on the o-Ni-P alloy film.

16-hydroxypalmitic acid [HO (CH ₂ ) ₁₅ C
OOH] isopropyl dimethyl silyl ether ester [(CH ₃ ) ₂ (CH ₃ ) ₂ CHSiO (CH ₂ ) ₁₅ COOSiCH (CH ₃ ) ₂
(CH ₃ ) ₂ ] as a raw material and the isopropyldimethylsilyl ether of 16-hydroxypalmitic acid [(C
H ₃ ) ₂ (CH ₃ ) ₂ CHSiO (CH ₂ ) ₁₅ COOH] was formed as a monomolecular film. Subsequently, this substrate was immersed in an acetic acid-water (3: 1) solution for 10 minutes to form a monomolecular film 5 of 16-hydroxypalmitic acid. Subsequently, a molecular weight of about 3000 O = C = N-CF 2 - (C 2 F
_{4 O) p - (CF 2} O) q -CF 2 -N = C = O (p: q = 1: 1, to create a solution of the respective structural units are randomly) were dissolved in Freon 0.08 wt% And filtered through a 0.2 μm filter. This solution was spin-coated at a rotation speed of 2500 times / min on the disk substrate on which a monomolecular layer of 16-hydroxypalmitic acid was formed, baked at 100 ° C. for 40 minutes, and then washed with Freon. The excess polymer was washed off to form a polymer layer 6.

The surface energy of the substrate surface before and after coating the polymer was calculated by measuring the contact angles of droplets with various surface tensions, and it was calculated from 43 erg / cm ² on the polysilicic acid film to 16 erg / c after coating the polymer.
It was found that m ² and the surface energy were remarkably reduced, and the effect of preventing the adhesion between the head and the base body was great.

Next, the dynamic friction coefficient acting between the disk substrate and the head was measured. The dynamic friction coefficient was determined by connecting a strain gauge to the head, measuring the dynamic friction force between the head and the disk generated when the disk was rotated at a constant speed, and dividing this by the load applied to the head. Measurement is load 15g, sliding speed 100
It was performed under the condition of mm / min. As a result, 0.175 was obtained as the value of the dynamic friction coefficient, which was 0.546 compared to 0.546 on the polysilicic acid film.
The value of the dynamic friction coefficient could be made extremely small.

A contact friction test between the disk and the head was repeated 30000 times using a disk substrate coated with this polymer and a monolithic head with a load of 70 g, but there was no change in the surface condition of the disk due to head crash or contact friction by the head. Met.

Example 2 16-Hydroxypalmitic acid was formed in the same manner as in Example 1 and on the disk substrate on which the polysilicic acid film was formed, by the same method. Molecular weight of about 3000 _{O = C = N-CF 2} - (C 2 F
_{4 O) p - (CF 2} O) q -CF 2 -N = C = O (p: q = 4: 1, to create a solution of the respective structural units are randomly) were dissolved in Freon 0.08 wt% And filtered through a 0.2 μm filter. This polymer was spin-coated at a rotation speed of 2500 times / minute onto the disk substrate having a monomolecular layer formed thereon, and the temperature was 100 ° C.
After baking for a minute, excess polymer was washed off with Freon. The values of the surface energy and the dynamic friction coefficient were obtained by the same method as in Example 1. As a result, by applying the polymer, the surface energy value was changed from 43 erg / cm ² on the polysilicic acid film.
16erg / cm ² and the coefficient of dynamic friction is 0.546 to 0.172
Could be made smaller.

Further, the abrasion resistance was evaluated in the same manner as in Example 1, but there was no change in the surface condition of the disk due to the contact friction test of 30,000 times.

(Example 3) Co-Ni of a disk substrate prepared by the same method as in Example 1
Instead of the polysilicic acid coating, Al ₂ O ₃ (amorphous alumina) was coated on the -P alloy film by the sputtering method. A monomolecular layer of 16-hydroxypalmitic acid was formed on this disk substrate in the same manner as in Example 1. The polymer solution prepared in Example 1 was spin-coated at 2500 times / minute, baked at 100 ° C. for 40 minutes, and then the excess polymer was washed off with Freon, and surface energy and dynamic friction were measured in the same manner as in Example 1. The value of the coefficient was calculated. As a result, the surface energy on the amorphous alumina is
The value of reduced from 45erg / cm ² of polymer on 15erg / cm ² dynamic friction coefficient could be reduced to 0.180 from 0.270.

Further, as in Example 1, there was no change in the disk surface state due to the contact friction test of 30,000 times.

Example 4 On the same substrate as in Example 1, the isopropyldimethylsilyl ether ester of 16-hydroxypalmitic acid and 1: 1 myristic acid were prepared by the Langmuir-Blodgett method.
The same operation was performed using the mixture as a raw material to prepare a monomolecular film made of a 1: 1 mixture of 16-hydroxypalmitic acid and myristic acid, and the other operations were performed in exactly the same manner as in Example 1. As a result, the value of surface energy after polymer coating as the value of the reduced dynamic friction coefficient 16erg / cm ² on the polymer from 43erg / cm ² on poly silicate coating 0.176 was achieved, and 0.546 on polysilicic acid coating In comparison, it was possible to make it smaller.

Further, as in the other examples, there was no change in the disk surface state by the contact friction test of 30,000 times.

(Example 5) In the same manner as in Example 4, the same operation was performed by the Langmuir-Blodgett method using a 1: 3 mixture of isopropyldimethylsilyl ether ester of 16-hydroxypalmitic acid and myristic acid as a starting material. A monomolecular film composed of a 1: 3 mixture of acid and myristic acid was prepared, and the experiment was performed in the same manner as in Example 1 except for the other operations. As a result, the value of the surface energy decreases from 43erg / cm ² on the polysilicic acid coating 15erg / cm ² on the polymer, the polymer coating after 0.171 is obtained as the value of dynamic friction coefficient, on polysilicic acid coating 0.546 I was able to make it smaller than.

Further, as in the other examples, there was no change in the disk surface state by the contact friction test of 30,000 times.

(Example 6) In the same manner as in Example 5, the same operation was performed by the Langmuir-Blodgett method using a 1: 3 mixture of isopropyldimethylsilyl ether ester of 16-hydroxypalmitic acid and myristic acid as a raw material. However, at the time of adsorption by the Langmuir-Blodgett method, hydrochloric acid was added to the aqueous phase to adjust the pH to 4.2, and 2.5 × 10 ^-4 mole / cadmium chloride aqueous solution was used to remove 16-hydroxypalmitic acid and myristic acid. A monomolecular film composed of a 1: 3 mixture of cadmium salt was prepared, and the experiment was performed in the same manner as in Example 1 except for the other operations. As a result, the value of the surface energy decreases from 43erg / cm ² on the polysilicic acid coating 16erg / cm ² on the polymer, the polymer coating after 0.170 is obtained as the value of dynamic friction coefficient, on polysilicic acid coating 0.546 I was able to make it smaller than.

Further, as in the other examples, there was no change in the disk surface state by the contact friction test of 30,000 times.

(Example 7) A disk substrate prepared in the same manner as in Example 1 and having a polysilicic acid film formed thereon was placed in a parallel plate type etching apparatus.
Using Ar, flow rate 18sccm, power density 0.35W / cm ² , pressure 1.
After etching for 2 minutes under the conditions of 3 Pa and a bias potential of 1 KV, subsequently, by the Langmuir-Blodgett method as in Example 4, isopropyldimethylsilyl ether ester of 16-hydroxypalmitic acid and myristic acid 1: 1 were used. Perform the same operation using the mixture as the raw material 16
A monomolecular film made of a 1: 1 mixture of hydroxypalmitic acid and myristic acid was prepared, and the experiment was performed in the same manner as in Example 1 except for the other operations. As a result, the surface energy value was 43 erg / cm ² on the polysilicic acid film to 15 er on the polymer.
It decreased to g / cm ² and the value of dynamic friction coefficient was 0.
174 was obtained, which was smaller than 0.546 on the polysilicic acid film.

Further, as in the other examples, there was no change in the disk surface state by the contact friction test of 30,000 times.

Example 8 A disk substrate prepared in the same manner as in Example 1 and having a polysilicic acid film formed thereon was placed in a parallel plate type etching apparatus,
Using Ar, flow rate 18sccm, power density 0.35W / cm ² , pressure 1.
After etching for 2 minutes under the conditions of 3 Pa and a bias potential of 1 KV, subsequently, by the Langmuir-Blodgett method, isopropyldimethylsilyl ether ester of 16-hydroxypalmitic acid and 1: 3 of myristic acid were applied by the Langmuir-Blodgett method. Perform the same operation using the mixture as the raw material 16
A monomolecular film composed of a 1: 3 mixture of hydroxypalmitic acid and myristic acid was prepared, and the experiment was performed in the same manner as in Example 1 except for the other operations. As a result, the surface energy value was 43 erg / cm ² on the polysilicic acid film to 16 er on the polymer.
It decreased to g / cm ² and the value of dynamic friction coefficient was 0.
172 was obtained, which was smaller than 0.546 on the polysilicic acid film.

Further, as in the other examples, there was no change in the disk surface state by the contact friction test of 30,000 times.

(Example 9) A disk substrate prepared in the same manner as in Example 1 and having a polysilicic acid film formed thereon was placed in a parallel plate type etching apparatus.
Using Ar, flow rate 18sccm, power density 0.35W / cm ² , pressure 1.
After etching for 2 minutes under the conditions of 3 Pa and a bias potential of 1 KV, the isopropyldimethylsilyl ether ester of 16-hydroxypalmitic acid and 1: 3 of myristic acid were then subjected to the Langmuir-Blodgett method in the same manner as in Example 6. Using the mixture as a raw material, add hydrochloric acid to the aqueous phase to
Using a 2.5 x 10 ^-4 mole / aqueous cadmium chloride solution prepared in 4.2, prepare a monolayer consisting of a cadmium salt of a 1: 3 mixture of 16-hydroxypalmitic acid and myristic acid, and perform other operations. The experiment was conducted in exactly the same manner as in Example 1. As a result, the value of the surface energy decreases from 43erg / cm ² on the polysilicic acid coating 17erg / cm ² on the polymer, the polymer coating after 0.178 is obtained as the value of dynamic friction coefficient, on polysilicic acid coating 0.546 I was able to make it smaller than.

Further, like the other examples, there was no change in the state of the disk surface due to the contact friction test of 30,000 times.

[Effects of the Invention] As described above, the magnetic memory according to the present invention has a large effect of reducing the contact frictional force generated between the head and the magnetic memory.
In addition, since the lubricant and the base material are firmly bonded to each other, the disk surface condition is kept good even after repeated use. Therefore, it is suitable for application to magnetic disk devices, magnetic drum devices, and the like.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a magnetic memory body of the present invention. 1 ... Alloy disk, 2 ... Non-magnetic alloy layer 3 ... Metal magnetic thin film medium, 4 ... Amorphous inorganic oxide 5 ... Monomolecular film, 6 ... Polymer layer 7 ... Magnetic memory

Claims (3)

[Claims] 1. A metal magnetic thin film medium is coated on an alloy disc having a mirror-finished surface coated with a non-magnetic alloy layer, or on an alloy disc having a mirror-finished surface, on which an amorphous inorganic oxide layer is formed. coated, further in the magnetic storage body orientation lubricant is coated thereon, said orientation lubricant, the general formula _{HO- (CH 2) n -COOH (} n is 10 to 23 integer) A monolayer of an organic compound containing the represented substance and a formula
The structural unit represented by C ₂ F ₄ O and the structural unit represented by the formula CF ₂ O are linearly and irregularly arranged, and the terminal group is represented by the formula O═C.
A magnetic memory comprising a polymer layer formed of a polymer having a molecular weight of 500 to 30,000 represented by ═N—CF ₂ —. 2. A metal magnetic thin film medium is coated on an alloy disk whose surface is a mirror surface coated with a non-magnetic alloy layer or on a mirror disk whose surface is a mirror surface, and an amorphous inorganic oxide layer is coated thereon. further, on the amorphous inorganic oxide layer, the general formula _{HO- (CH 2) n -COOH (} n is 10 to 23 integer) to produce a monomolecular layer of an organic compound containing a material represented by, Then, the structural unit represented by the formula C ₂ F ₄ O and the formula C
Structural units represented by F ₂ O are linearly and irregularly arranged, and end groups have a molecular weight of 500 to 3000 represented by the formula O = C = N-CF _2-.
A method for producing a magnetic memory, comprising: applying the polymer of No. 0, or baking after applying the polymer to provide the polymer layer on the amorphous inorganic oxide layer. 3. A metal magnetic thin film medium is coated on an alloy disc having a mirror-finished surface coated with a non-magnetic alloy layer or on an alloy disc having a mirror-finished surface, and an amorphous inorganic oxide layer is coated thereon. after treatment with plasma, the above amorphous inorganic oxide layer, a single general formula _{HO- (CH 2) n -COOH (} n is 10 to 23 integer) organic compounds containing a substance represented by A molecular layer is prepared, and then the structural unit represented by the formula C ₂ F ₄ O and the formula C
Structural units represented by F ₂ O are linearly and irregularly arranged, and end groups have a molecular weight of 500 to 3000 represented by the formula O = C = N-CF _2-.
A method for producing a magnetic memory, comprising: applying the polymer of No. 0, or baking after applying the polymer to provide the polymer layer on the amorphous inorganic oxide layer.