JPH03183018A - Burnishing head - Google Patents

Abstract

PURPOSE:To efficiently burnish a magnetic recording medium without flawing the medium by using a material consisting of ZrO2 into which respectively specific ratios of Y2O3 and Al2O3 are incorporated to constitute the burnishing head. CONSTITUTION:The burnishing head to be used for removing the microprojections existing on the surface of the magnetic recording medium is produced by using the material which consists essentially of the ZrO2 and into which 6 to 10mol% Y2O3 and 3 to 6mol% Al2O3 are incorporated. The magnetic recording medium is efficiently burnished without flawing the medium in this way. The production efficiency of the burnishing head is enhanced.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a burnish head used to remove minute protrusions present on the surface of a magnetic recording medium in order to guarantee the minimum flying height of a magnetic head. In particular, its constituent materials include Y, O, and Al.

The present invention relates to a burnish head manufactured using Zr01-based ceramics containing O3.

(Prior art) Magnetic recording media generally include γ-Fe,
0. ,Fe,O,,Go-Fe,04,Go-7Fel
O.

There are coated media coated with magnetic fine particles such as, etc., and thin film magnetic media where magnetic metal is deposited on a non-magnetic substrate by sputtering. In these magnetic media, when the magnetic film is still formed, the surface has a thickness of 0.05 μm.
A large number of microscopic protrusions of about 100% or more remain.

In thin-film magnetic media, these protrusions are caused by dust that adheres before and after forming a magnetic film on a non-magnetic substrate, and in coated media, they are non-magnetic fine particles such as alumina mixed in during the magnetic coating process. or These protrusions prevent the magnetic head from flying stably and wear out the magnetic head, degrading the recording characteristics of the magnetic head. They also damage the media surface, accelerating its wear and damage, and causing damage to the magnetic head. It also causes deterioration of recording characteristics. To solve this problem, the surface of the magnetic medium is smoothed, but an in-depth method is to contact the surface of the magnetic medium with a small force using a tape with minute abrasive grains fixed to the surface. A burnish head with a mirror-polished slider surface is attached to a gimbal, and the head is levitated almost in contact with a rotating magnetic medium, and the head is reciprocated to remove minute protrusions that collide with the head. There is a way to remove it.

When using a burnish head to remove protrusions, conventional burnish head materials include diamond, sapphire, AI, 0. -TiB,,Al,O,-TiC
Hard materials such as are used.

(Problem to be Solved by the Invention) However, when removing protrusions using a burnish head made of these materials, the surface of the magnetic medium is burnished only once or twice (one or two burnish cycles). ) cannot completely remove the protrusion and requires several burnish cycles. This low burnishing efficiency is one of the reasons for reducing the productivity of magnetic media. On the other hand, even if the protrusions can be removed efficiently, there is a problem that the magnetic medium may be damaged during the process. Furthermore, the materials that make up these burnished heads, especially diamond and sapphire, are not only expensive but also very hard, so when processing these materials, very expensive cutting tools and polishing tools are required. There is also the problem that a large amount of money is required to produce the burnished head itself.

(Means for Solving the Problems) In order to solve the above technical problems, the present invention uses 6 to 10 mol% of y, o, as a material for the burnished head.
Z containing Al, O, in the range of 3 to 6IIlo1%
rO□ ceramic was used. This allows efficient burnishing without damaging the magnetic medium.

Moreover, since the above-mentioned material is cheaper and easier to process than conventional materials, it is possible to improve the production efficiency of the burnish head.

(effect) The present invention uses ZrO as a material for the burnished head.

The burnishing efficiency is improved by using ceramics. That is, it utilizes the property of Z r O, which has excellent workability, and also contains Y, 0. 6 to 10 mol%, Al.

By containing Ol in a range of 3 to 6 mol %, excellent effects as a burnish head are obtained. In the present invention, the content of Y, O, is 6 to 10
The reason for specifying the mol% range is that if it is less than 6 mol%, the state of Y, O, becomes unstable and phase transformation is likely to occur, and if it exceeds mol%, the strength will decrease too much and it is not suitable for burnish heads. This is because there is no Also, AI
The reason for specifying the amount of Oj in the range of 3 to 6 mol% is because
Al if less than 3 mol%.

0, is because the strength decreases due to grain growth, - direction, 6
This is because if the content exceeds mol%, Al, O, and the like will be easily dispersed and the toughness will decrease.

(Examples) The present invention will be described in more detail below based on Examples, but it goes without saying that the scope of the present invention is not limited to these Examples.

As shown in Table 1, y
, o, and a material containing Al, O, as appropriate, were used to produce burnish heads, respectively.

Using these created burnish heads, we used a diameter of 3.5
The burnishing effect (burnish cycle and number of remaining protrusions per side of the magnetic medium) when fine protrusions existing on the surface of an inch thin film magnetic medium were removed by punishing is shown in Table 1 as sample numbers 1 to 4. Here, the burnish cycle is a process in which a burnish head placed on a rotating magnetic medium makes one reciprocation between the innermost circumference and the outermost circumference of the magnetic medium. The burnishing conditions here are that the burnish head is attached to a gimbal with a spring load of 9°5 gf, and the burnish head is pressed onto a thin film magnetic medium rotating at a peripheral speed of 3 m/sec.

The number of remaining protrusions is the number of pulse-like waveforms detected from the piezoelectric element when a normal magnetic head with a piezoelectric element bonded to the rear is floated at a flying height of 0°05 μm over the magnetic medium after garnishing. It was measured as follows.

In addition, sample numbers 5 to 9 in Table 1 are comparative examples containing ZrO with a component composition outside the range specified in the present invention.
These are the results of examining the burnishing effect under the same conditions as in this example using a burnish head made of a material such as , and a burnish head made of a conventional material.

As is clear from this table, the burnishing head of the present invention has an extremely superior burnishing effect in that protrusions can be completely removed in fewer burnishing cycles than the conventional burnishing head. Furthermore, it can be seen that when burnishing is performed using the burnish head of the present study, the magnetic medium is not damaged.

(Effect of Gummy Brightness) As explained in detail above, the burnish head of the present invention has very high burnishing efficiency and does not damage the magnetic medium, so it can improve the productivity of the magnetic medium and improve the reliability of the magnetic medium. It is effective in improving sexuality. Furthermore, since the material is inexpensive and has excellent workability, it has the effect of improving the production efficiency of the burnish head itself.

Claims (1)

[Claims] Y_2O_36-10 mol%, Al_2O_33-6
1. A vanishing head for a magnetic recording medium, characterized in that it is constructed using a material in which the remainder substantially consists of ZrO_2 in mol%.