JPH0359817A - Magnetic storage body, method for manufacturing the same, and magnetic storage device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to magnetic storage devices (magnetic disk devices, magnetic drum devices, and magnetic tape devices) and magnetic storage bodies (hereinafter referred to as storage bodies) used in the magnetic storage devices. ) and its manufacturing method.

[Prior Art] A storage body having a metal magnetic medium (hereinafter referred to as a metal medium) must have sufficient mechanical reliability and moisture content to withstand contact with a recording/reproducing head (hereinafter referred to as a hept). It is required to have sufficient corrosion resistance to withstand corrosive environments such as chlorine and chlorine.

Conventionally, substrates have been A/, alloy substrates, etc., which have been subjected to non-magnetic plating treatment such as alumite treatment or N1-P plating, and then polished to make them mirror-finished or have streaks.
Non-magnetic plating such as E, Hi-Ou-P and Or
, coated with a ferromagnetic metal medium after coating with Bi, etc.,
Furthermore, SXO, (including polysilicic acid), AtN, O, S
i, H4 and At, 0. A protective film such as a solid solution of is coated, with or without an intermediate layer using a coupling agent, and then a thin layer of a liquid lubricant such as perfluoropolyether or a solid lubricant such as higher alcohol or fatty acid is coated. be done.

Although the above-mentioned memory bodies have a certain level of durability and have already begun to appear on the market, they have major drawbacks.

A magnetic storage device equipped with the above storage body was heated at 40℃80%R.
If left in an environment of H., corrosion points will occur in one or two places on one memory body, leading to defect errors. Furthermore, repeated contact between the storage body and the head increased the coefficient of friction between them, often causing the spindle motor to stop.

[Problems to be Solved by the Invention] Conventional techniques have had the problem of not being able to sufficiently ensure the corrosion resistance of the metal medium, and also not being able to sufficiently ensure the mechanical reliability between the storage body and the head.

The present invention is intended to solve the above problems, and its purpose is to dramatically improve the corrosion resistance of metal media in environments containing moisture and chlorine, and to reduce the friction between the storage body and the henode. It is an object of the present invention to manufacture and provide a highly reliable storage body that can significantly reduce the coefficient and maintain its effect for a long period of time, and to provide a magnetic storage device using the storage body.

[Rainbow Means for Solving the Problems] The present invention provides a method in which a metal magnetic medium is coated on a substrate, and a thin film made of at least one substance selected from oxides, nitrides, carbides, and carbon is coated on the metal magnetic medium. is coated, and then a cured film of at least one organometallic compound having at least one amino group or imino group at one end of the molecule and a hydrolyzable group at the other end is coated, and It is characterized in that it is coated with at least one metal salt of a fatty acid in which at least a portion of hydrogen atoms are replaced with fluorine atoms.

The metal media can be coated using materials and methods similar to those of the prior art. Co, IFe, Ni.

A metal such as Or, Ta, P, or a noble metal element is coated by a dry film forming method such as a wet plating method or a sputtering method.

Oxides, nitrides, and carbides are At, B, and Y.

Si, Ti, Zr, Hf, Nb, Ta, Or.

It is a compound with an element selected from Mo and W, and the mixed layer and lamination thereof are arbitrary. Carbon can be graphite, diamond, or amorphous, either alone or in a mixture.

These are laminated layers, and a film thickness of 100 to 500 layers is appropriate for each layer. The above compound and carbon can be formed by a PVD method or an OVD method such as a sputtering method or an ion blasting method, and an oxide can also be obtained by coating and baking an organometallic compound.

An organometallic compound having at least one type of amine/imino group at one end of the molecule and a hydrolyzable group at the other end is NH, -0,H4-NH-0,H, -M -(OR),
: or NH, -0, Ho-M-(OR).

N H, -00N H-0, H6-M-(OR), etc., where M is Si, Ti, Zr, Hf, Nb or Ta, and R is an alkyl group having 1 to 4 carbon atoms or hydrogen. Actually, X is the valence of the metal element M.

represented by. The above-mentioned organometallic compounds may be used alone or in combination, and in particular, in the case of silicon compounds, they may be used with or without the addition of a weak acid aqueous solution, diluted with a soluble solvent such as alcohol, and then subjected to a spray method, a spinner method, a dipping method, or an ultrasonic atomization method. The coating is applied by a known manufacturing method such as the method, and baked if necessary. The ratio of solvent dilution is appropriately determined depending on the desired film thickness. In addition, firing at 50 to 200"cJ for 1 to 30 minutes is sufficient, and the appropriate film thickness is from the monomolecular layer level to 100X.A metal salt of a fatty acid in which at least a portion of the hydrogen atoms is substituted with fluorine atoms is There is no restriction on straight chain dibranches or saturated or unsaturated fatty acids, but the number of carbon atoms is 12 or more, and N a , ' K ,
Metal salts such as Li, Oa, B a and Z n in which some of the hydrogen atoms are substituted with fluorine atoms are desirable. These are dissolved and diluted in a soluble solvent, formed by a wet method such as a spinner method, a dipping method, a spray method, a vacuum evaporation method, and the like, and fired if necessary. The dilution ratio is determined as appropriate depending on the desired film thickness.
0°C for 1 to 20 minutes is sufficient, and a film thickness of 10 to 100 mm is appropriate. By forming a thin film made of at least one substance selected from carbon, the metal medium is protected from impact wear of the head and from moisture, chlorine, etc. in the environment.

However, the above-mentioned thin film is thin, around several hundred times, and it is difficult to make it pinhole-free. Moreover, among the above-mentioned thin films, materials other than carbon have poor lubricity, and even the most excellent carbon film has insufficient lubricity, so it has been common practice to layer various lubricants on the thin film. However, because the adhesion between the thin film and the lubricant is weak, the lubricant is gradually removed from the memory element due to contact wear between the head and the memory element over a long period of time, causing the initial excellent lubrication effect to be lost. I got lost.

The present invention provides hydrogen after coating the thin film with a curing group of an organometallic compound having at least one type of amino group or imino group at one end of the molecule and a hydrolyzable group at the other end. It is coated with a metal salt of a fatty acid in which some of the atoms are replaced with fluorine atoms. The hydrolyzable group is
Active groups (-
Oh.

-0OOH etc.), and the amino group or imino group has a strong affinity with the carbonyl group of the fatty acid metal salt.
The fatty acid metal salt is firmly fixed on the memory and is prevented from being removed from the memory due to impact wear of the head.

In addition, fatty acid metal salts in which some of the hydrogen atoms are replaced with fluorine atoms exhibit excellent water repellency and have the effect of increasing rust prevention.
For the above reasons, the effect is maintained over a long period of time.

As described above, it has become possible to manufacture and provide a memory body with excellent long-term mechanical reliability and storage reliability, and furthermore, by using this memory body, the reliability of a magnetic memory device has been significantly improved.

[Example] After applying non-magnetic N1-P alloy plating to a door thickness of approximately 15 μm on a mirror-finished disk-shaped aluminum alloy substrate, the surface roughness was polished to a surface roughness of Ra near 0 to 120 and Rmax.
= 700~1500X K surface intoxication streaks were processed, and 0O-Ni-P alloy plating was applied to approximately α05μ door thickness.

Next, set the above substrate in a magnetron sputtering device,
After exhausting to below 5 x 10-' torr,
After heating the substrate to 80°C and removing adsorbed moisture, Ar gas was introduced and the pressure was adjusted to 5 x 10-3 torr.
Targeting the materials shown in Table 1, power density 4
The film was formed using W/-.

Next, the organometallic compound shown in Table 1 was added to methanol and Freon 113 (mixing ratio 1:3) at 0.005W/
It was dissolved at a concentration of V%, applied by a dipping method (10 crn/wisteria), and then baked at 110'O for 10 minutes.

Next, the fatty acid metal salts shown in Table 1 were mixed with Freon 113 and methanol (mixing ratio 9:1 by volume) at a2 W/v.
% concentration and applied by dipping method, then 11% concentration.
It was baked at 0°C for 10 minutes.

A memory body manufactured by the above manufacturing method and a 3370 type thin film head (Flyhide 0.15 μms 9 m/
A magnetic storage device was fabricated using a magnetic storage device (see) and evaluated by the following tests. The results are shown in Table 2.

(1) OS S durability test aSS operation (rise and fall time 10 seconds)
Determine the change in appearance before and after, the coefficient of static friction, and the rate of decrease in output.

(2) Corrosion Resistance Test The product was left in an environment of 80°C and 90% R and H, and after the time had elapsed, the number of missing bits was measured, and the time when the number of missing bits increased was determined to be the end of its life.

Table 2 [Effects of the invention] Magnetic storage devices using thin-film storage as a storage medium compatible with high recording densities have been on the market for some time, but their use has been limited to some due to concerns about long-term reliability. .

According to the present invention, even if the storage medium is used under warm and humid conditions, the metal medium will not be affected in any way in practical terms, and the mechanical reliability will be improved even when using heads that are becoming increasingly hard and have low fly-hide properties. Because of the high resistance, even if the magnetic storage device is further miniaturized and installed in a magnetic storage device used in harsh environments, no deterioration in the characteristics of either the storage body or the head will be observed.

As described above, manufacturing of highly durable memory bodies compatible with high recording density,
Since it has become possible to provide a highly reliable magnetic storage device by providing and using the storage medium,

Claims (3)

[Claims] (1) A metal magnetic medium is coated on the substrate, a thin film made of at least one substance selected from oxide, nitride, carbide, and carbon is coated on the metal magnetic medium, and then one end of the molecule is coated with a cured film of at least one organometallic compound having at least one type of amino group or imino group and a hydrolyzable group at the other end, and furthermore, at least a part of the hydrogen atoms are substituted with fluorine atoms. 1. A magnetic memory material coated with at least one metal salt of a fatty acid. (2) A step of coating a metal magnetic medium on a substrate, a step of coating the medium with a thin film made of at least one substance selected from oxides, nitrides, carbides, and carbon, and then one end of the molecule. a step of coating the substrate with a cured film of at least one organometallic compound having at least one type of amino group or imino group and having a hydrolyzable group at the other end; 1. A method for manufacturing a magnetic memory, comprising the step of coating with at least one metal salt of a substituted fatty acid. (3) A metal magnetic medium is coated on the substrate, a thin film consisting of at least a species selected from oxides, nitrides, carbides, and carbon is coated on the metal magnetic medium, and then one end of the molecule is coated with a cured film of at least one organometallic compound having at least a species of an amino group or an imino group and a hydrolyzable group at the other end, and furthermore, at least a part of the hydrogen atoms are substituted with fluorine atoms. 2. A magnetic memory device characterized by using the magnetic memory body according to claim 1, which is coated with at least one metal salt of a fatty acid.