JPS61224137A - Method for burnishing magnetic recording medium - Google Patents

Abstract

PURPOSE:To remove efficiently the fine protrusions on the surface of a disc without any head clash by specifying the load of a gimbal for supporting a slider and burnishing with a low flotation of the head and a high-frequency wave. CONSTITUTION:The spring load of a gimbal to be equipped with a burnishing head is regulated to 10-25gf or preferably to 15-20gf. Consequently, the flotation can be reduced to 0.08-0.1mum and the peripheral speed of the disk is simultaneously increased during the burnishing. Namely, the spring load is increased, the peripheral speed is increased and high-speed and low-flotation burnishing is made possible with excellent flotation stability and without any head clash.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for smoothing the surface of a magnetic disk in order to guarantee a minimum head flying height.

<Prior art> Magnetic disks are generally made of 1ζ aluminum substrate.
-Fe2u3. Fe5O4, Co-Fe3O4, Co
A so-called powder coating medium coated with magnetic fine particles such as -γ-Feze3, or a thin film medium manufactured by forming a film of magnetic metal on a substrate by vacuum evaporation or sputtering is used. The surface of the board is tape polished,
It is finished and used by puff polishing etc.

In this case, the surface of the magnetic disk on which the magnetic coating is formed is
Many microscopic protrusions with a height of 0.1 μm or more remain, and in the coating medium, this is necessary to increase the strength of the coating film.
This is caused by hard non-magnetic particles such as alumina mixed into the magnetic paint. Furthermore, microprotrusions that commonly exist in coating media or thin film media formed by vacuum evaporation or sputtering are caused by adsorption of dust to the disk surface during the steps before and after forming the medium on the substrate. The presence of such protrusions causes the magnetic head to deteriorate due to wear and tear, and the flying ability of the head to deteriorate, causing head crashes and the like. Therefore, it is desirable to smooth the magnetic surface. To solve this problem, a vanish head with a mirror-polished slitter surface (the head shape is the same as the actual head or a specially processed one) is made of hard materials such as diamond, sapphire, and ceramics such as AtzOs-TIBz. The conventional method is to attach a gimbal with a spring load of 9-#f f, which is used in commercially available magnetic disk drives, to levitate and reciprocate above a rotating magnetic disk to remove minute protrusions that collide with the head. It has been adopted.

<Problems to be Solved by the Invention> However, in this type of system, the flying height is lowered by reducing the peripheral speed without changing the spring pressure of the vanishing head, resulting in poor flying stability and The crush may cause fatal defects on the magnetic disk, and it is difficult to completely remove minute protrusions on the surface of the magnetic disk. Furthermore, the paniche processing time is long and the productivity is poor.

Means for Solving the Problems> In order to solve the problems of the prior art described above, the present invention provides a method for increasing the spring load of the gimbal to which the honeycomb head is attached from 10 to 10.
By setting the head flying height to 25ffl, preferably 15 to 20ff, a low head flying height of 0.08 to 0.1 μm is achieved.
At the same time, it is an object of the present invention to provide a magnetic disk smoothing method that efficiently removes minute protrusions on the disk surface without head crushing by increasing the disk circumferential speed during burnishing.

<Function> By increasing the spring load and increasing the circumferential speed, flying stability is good and high-speed, low-flying height vanishing without head crushing becomes possible.

<Example> Hereinafter, the present invention will be explained in detail by giving concrete examples.

Two types with different gimbal spring loads (16, 8ff).

20.0ff) A second test was conducted on the new head. The spring load indicates the gimbal spring load when the distance from the upper surface of the arm supporting the gimbal spring to the disk surface is 2.2 m, and the disk used is a magnetic disk with a vanishing protrusion height of 0.16 to 0.32 μm. .

These results are shown in NQI~Ma4 in the table.

<Comparative example> Two types of gimbal spring loads different from the above example C9, g
An experiment similar to that in the example was conducted using a vanishing head of 26.3 ft (ft, 26.3 ff).

These experimental results are shown in the table as Na5 to Na1O1ζ.

゛-From the table showing the experimental results, Comparative Example Ratios 5 to 7 are stable when the flying height is high, but when it becomes low, the flying stability deteriorates and the magnetic film is peeled off by the media crusher, and
In Comparative Examples Fish 8 to Demon 10, it was observed that the magnetic film was already peeled off before the vanish head floated due to the strong medium pressing pressure.

In comparison, examples according to the present invention! lh1 to demon 4 can efficiently remove minute protrusions on the disk surface at high circumferential speed and low flying height without head crash.
Recognized as having excellent productivity.

As detailed above, by using the burnishing method for magnetic recording media of the present invention, stable flying of the burnish head, high circumferential speed, and low flying height burnishing are possible, and a magnetic disk with excellent smoothness can be manufactured. It is possible to do so. In addition, since burnishing can be done in a short time, productivity is increased by 1.
It was also recognized that this is an excellent processing method.

Claims (1)

[Claims] A vanishing method for removing minute protrusions on the surface of a magnetic recording medium using a slider supported by a gimbal spring,
The gimbal load supporting the slider is 10 to 25 g^
A magnetic recording medium burnishing method characterized in that burnishing is performed at a low head flying height of 0.08 to 0.10 μm and at a high circumferential speed.