JPH01216769A - Burnish head slider and method for burnishing - Google Patents

Abstract

PURPOSE:To efficiently remove the surface projections of a magnetic recording medium in a short time by installing a piezoelectric element which is displaceable nearly in the perpendicular direction to the surface of the magnetic recording medium on a slider body and installing a blade on this piezoelectric element. CONSTITUTION:The slider body 14 of a burnish head slider 13 is provided opposite to the surface of a rotating magnetic recording medium (magnetic disk) 2. A piezoelectric element 15 is installed on the slider body 14 displaceably in nearly perpendicular direction to the surface of the magnetic recording medium 2, while installing a blade 16 on this piezoelectric element 16. As a voltage applied to this piezoelectric element 15 is gradually increased, the gap between the blade 16 and the magnetic recording medium 2 during high-speed rotation can be gradually reduced or, by oscillating the blade 16 in this gap direction, the surface projections of the magnetic recording medium 2 can be removed efficiently and rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a burnish head slider and a burnishing method for removing surface projections of a magnetic recording medium.

(Prior art) In order to perform high areal density recording in a magnetic disk device, when the magnetic head that records and reproduces signals travels over the magnetic disk, the flying gap between the magnetic head and the magnetic disk must be reduced. It needs to be made as small as possible. In order to reduce the flying gap, the surface accuracy of the magnetic disk medium must also be improved.

For this purpose, the fine protrusions remaining Jc after forming the substrate are conventionally removed by parsing, curing, and lζ after each process. The burnisher slider used in this burnisher is a floating slider having a hydrodynamic gas bearing, similar to those currently used in magnetic disk drives.

That is, as shown in FIG. 8, when the toss slider 1 collides with the protrusion 3 on the magnetic disk 2, a part of the minute protrusion is scraped off. This reduces the height of the protrusions 3 and smoothes the surface of the magnetic disk 2. In order to increase the amount of scraping at this time, it is considered effective to use a harder material for the burnish head slider l and to increase the rotational speed of the magnetic disk 2 as high as possible.

However, when removing protrusions from the burnish head slider 1 body as in the past, it is difficult to process the slider if a very hard material is used. It is very difficult to process the corners and clearance angles.

In addition, the conventional method of using the burnish head slider 1 is to set the slider shape, load for pressing, and disk rotation speed so that the spacing is smaller than the spacing during recording and playback, and while rotating the disk at a constant rotation speed. By moving the slider in the radial direction of the disk, the tops of the protrusions higher than the set minimum spacing were scraped off to some extent. With this method, even tall protrusions are difficult to remove in a short period of time, and even very small protrusions, which are a problem with the C8S (Contact Start Stop) system used in many magnetic disk drives, can be removed. The problem was that it couldn't be done.

(Problems to be Solved by the Invention) Conventional nopah, shoe, and toss sliders are difficult to process when hard materials are used, and it takes time to remove protrusions.Furthermore, protrusions that are lower than the slider flying height cannot be removed at all. ◎ The present invention was made based on the above-mentioned drawbacks of the conventional technology, and it is possible to quickly and reliably remove high protrusions that may cause defects during foundation formation, and also to eliminate vibrations. When the head cracks,
To provide a burnish head slider that can reliably remove small protrusions that cause scratches or damage the head and medium during C8S, and a method for using the same.

[Structure of the invention]

(Means for Solving the Problems) The present invention attaches a piezoelectric element with a blade attached to a slider, changes the gap between the blade and the magnetic recording medium by controlling the voltage applied to the piezoelectric element, and gradually changes the gap between the blade and the magnetic recording medium by controlling the voltage applied to the piezoelectric element. It is characterized by removing protrusions by reducing the gap, or by changing the degree or gap using high frequency.

(Function) According to the present invention, since the blade for removing protrusions and the floating RAD slider are separate members, a hard material with poor workability can be used for the blade, thereby improving the efficiency of removing protrusions. Furthermore, since the rake angle and clearance angle of the blade, which are essential factors for optimizing the cutting process, can be delicately controlled, the removal efficiency of protrusions can be further improved.

In addition, the gap between the blade and the magnetic recording medium can be controlled with high precision and responsiveness by applying voltage to the piezoelectric element that supports the blade. Protrusions can be removed by gradually reducing the gap between the machine and the medium, or the blade can be vibrated across the gap to remove protrusions, making it possible to reliably remove even small protrusions.

Therefore, it is possible to provide a burnishing slider that can efficiently and reliably remove protrusions on a magnetic recording medium, and a method for using the same.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 2 denotes a magnetic disk, which is a magnetic disk substrate or a magnetic disk base provided with a magnetic layer, a protective layer, etc., which is the subject of a magnetic disk.

On the upper surface of the magnetic disk 2, a bar and sea head slider 13, which is an embodiment of the present invention, is arranged. FIG. 2 shows the structure of the slider 13, in which a piezoelectric element 15 is attached to the rear end surface of the floating head slider body 14.
A blade 16 made of, for example, sapphire is attached to the opposite surface of the slider body 14 of the piezoelectric element 15. This blade 16 is movable in the floating direction of the slider body 14 by driving the piezoelectric element 15. Furthermore, as shown in FIG.
00 (degree) relief angle r is set to 5' (minute). The rake angle α is, for example, about 5° to 30°, and the relief angle r is 5' to 1.
It is usually set to 0.008 degrees.

The procedure for removing the protrusion is to first float the RAD slider 13 over a transparent disk in a Nokuichi dish, and measure the light interference color between the mirror surface 17 of the blade 16 and the floating surface of the glass disk at a constant rotation speed using a well-known method. By measuring this, the correspondence between the voltage applied to the piezoelectric element 15 and the gap between the blade 16 and the transparent disk is obtained. Next, a burnish head slider 13 is installed on the magnetic disk 2 from which the protrusion is to be removed, and the magnetic disk 2 is rotated at a constant rotation speed.

This is a diagram showing the correspondence between the voltage applied to the piezoelectric element 15 and the gap between the blade 16 and the transparent disk, where the gap between the blade 16 and the magnetic disk 2 is determined in advance.

The burnish head slider 13 is moved in the radial direction of the magnetic disk 2 from the innermost circumference to the outermost circumference by approaching the magnetic disk 2 from the direction of the largest gap so that (minimum flying gap during recording and reproduction) is obtained. Next, blade %h.

The burnish head slider 13 was again moved in the radial direction from the innermost circumference to the outermost circumference, and the same process was performed again at a flying height of 3 (h).

As a result of conducting experiments using such a burnish head slider 13, it was found that the protrusion removal rate was significantly improved compared to conventional burnishing, so-called floating, and bar edge using only the toss slider body. Ta.

Also, the gap %h between the blade 16 and the magnetic disk 2
After setting the flying height to , the removal rate can be further increased by applying a high frequency voltage (with bias) to the piezoelectric element 15 to change the flying height to . Significantly improved. As a result of experiments, the frequency at this time is about IKHz, or 2KHz to 10KH.
z8 degrees seems to be effective.

FIGS. 4 to 6 show modified examples of the per-edge slider of the present invention. Piezoelectric element 15
The attachment of the blade 16 has been devised. Figure 4 shows
The piezoelectric element 15 is expanded and contracted in the most usual manner.

In such a configuration, the blade 16 does not need to be located at the rear end of the floating rad slider 14 body, and may be placed with a groove provided near the center.In addition, in the above embodiment, the blade 16 is made of sapphire. However, the blade 16 is made of a normal material that is easy to process.
If a diamond thin film or the like is partially attached to the surface of the blade 16, the cost can be reduced.

In addition, in order to remove minute protrusions below the flying height as a burn-off method, in the previous embodiment, the piezoelectric element 15 is driven to lower the blade 16.

However, it is possible to remove minute protrusions by changing the flying height stepwise without using the above-described structure of the peredge slider of the present invention.

Next, another Burnishi method No. 2 will be explained. In the conventional varnish shown in FIG. 8, the toss slider l is supported by an arm 4 having spring properties, and a predetermined spring load acts on this arm 4. By increasing this spring load step by step, the flying height of the toss slider 1 becomes smaller until the part edge 1 is reached, allowing the removal of minute protrusions that could not be removed conventionally. The easiest way is to place weights on arm 4 one after another. As another method, Fig. 7(a), Cb
), there is a method of supporting the burnish head slider l on the arm 4 using a piezoelectric element 20, or a method of supporting the arm 4 on a carrier, a jig 21, etc. using the piezoelectric element 20. At this time as well, it is preferable to use a part of the burnish head slider 1 as a mirror surface and perform control by determining the relationship between the voltage applied to the piezoelectric element 20 and the flying clearance in advance on a transparent disk as in the previous embodiment. Further, if a variable voltage is applied to the piezoelectric element 20 as in the previous embodiment, the protrusion removal efficiency is further improved significantly compared to the conventional one.

It should be noted that, compared to a method in which the flying clearance is set small from the beginning and removed, damage to the disk, burner, and head slider is significantly reduced.

〔Effect of the invention〕

As described in detail above, according to the present invention, protrusions can be efficiently removed in a short time, and even minute protrusions can be removed.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a burnishing device using a burnish head slider according to the present invention, FIG. 2 is a perspective view of a burnish head slider according to the present invention, and FIG. 3 is a detailed view of a blade according to the present invention. 4 to 6 are perspective views showing modified examples of the varnish to rad slider of the present invention, and FIG.
This figure is a side view of a burnish head slider according to another invention, and FIG. 8 is an explanatory diagram illustrating a conventional burnishing method. 2... Magnetic disk (magnetic recording medium), 13... Burnish head slider, 14... Slider body,
15...Piezoelectric element, 16...Blade, 17...
Mirror surface, 20...piezoelectric element.

Claims (3)

[Claims] (1) A slider body disposed facing the surface of a rotating magnetic recording medium, a piezoelectric element attached to the slider body so as to be displaceable in a direction substantially perpendicular to the surface of the magnetic recording medium, and the piezoelectric element A burnish head slider characterized by consisting of a blade attached to. (2) The gap between the burnish head slider, which is disposed facing the surface of the rotating magnetic recording medium, and the magnetic recording medium is gradually reduced or varied at an arbitrary period. Burnish method. (3) The burnish head slider according to claim 1, wherein at least a portion of the surface of the blade facing the magnetic recording medium surface is formed with a mirror surface.