Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record
Reexamination Certificate
2000-01-18
2003-07-08
Nguyen, Hoa T. (Department: 2652)
Dynamic magnetic information storage or retrieval
Fluid bearing head support
Disk record
C029S603120
Reexamination Certificate
active
06590745
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a magnetic head comprising a head core part which includes at least either a magnetic head element for writing or a magnetic head element for reading formed on a base body, a method of manufacturing the same, and a magnetic disk apparatus.
2. Description of the Related Art
In recent years, research and development for improving surface recording density has been actively carried out in the field of magnetic recording devices such as computers.
FIG. 11
shows a general configuration of a magnetic disk apparatus as an example of a magnetic recording device. In the magnetic disk apparatus, a magnetic head slider (also simply referred as magnetic head or head in the followings)
100
including a base body and a head core part formed on the base body is placed so as to face a surface of a magnetic disk (also simply referred as disk in the followings)
110
as a recording medium. Although, a magnetic disk apparatus usually has a plurality of magnetic disks and one magnetic head slider is respectively provided on each surface of the magnetic disks, only one magnetic head slider and one magnetic disk are shown in FIG.
11
and the rest of them are omitted therein. The magnetic disk
110
rotates by a spindle motor
111
. The magnetic head
100
is held by the end portion
132
q
of a suspension
132
. The other end portion
132
q
of the suspension
132
is attached to the end portion of a drive arm
131
. The magnetic disk apparatus also comprises a carriage unit
120
at the base side of the drive arm
131
for positioning the magnetic head
100
on the track of the magnetic disk
110
. The carriage portion
120
has a carriage
122
which swings about the shaft
121
, and an actuator
123
composed of a voice coil motor and so on. The actuator
123
drives the carriage
122
to swing about the shaft
121
so that the magnetic head
100
can be moved in the radial direction (arrow direction shown in
FIG. 11
) of the magnetic disk
110
.
In the magnetic disk apparatus with such a configuration, in general, recording/reproducing of information is performed as follows. The head
100
pressed by the suspension
132
is in contact with the disk
110
when the disk
110
is not rotating. When the disk
110
is rotated, an airflow generates between the head
100
and the disk
110
so that a lift is created. As a result, the head
100
flys to leave from the surface of the disk
110
, and performs recording/reproducing of information by relatively shifting on the disk
110
while holding a small space in therebetween by keeping the balance of the lift and the pressure from the suspension
132
. Such a recording/reproducing system is called CSS (Contact-Start-Stop) system.
The surface where the magnetic head and the magnetic disk are contacted together is preferable to be smooth in order for the magnetic disk apparatus to have high surface recording density. Particularly, in the device with CSS system, it is preferable that the state both contacted surfaces of the head and the disk does not change (that is, excellent in CSS characteristic) even after repeating the CSS operation for a number of times. However, when both of the surface of the head and the disk are smooth, the head and the disk adsorb each other resulting in deterioration of the CSS characteristic. Accordingly, in the magnetic disk apparatus of the related art, the adsorb phenomenon is avoided by roughing either one of the surface of the head or the disk.
An example of roughing the surface of the disk is disclosed in Japanese Patent Application Laid-open Sho 61-246380, Hei 5-94618 and Hei 5-159276. In Japanese Patent Application Laid-open Sho 61-246380, a method of roughing the surface of the disk as a recording medium by applying a heat treatment in an oxygen atmosphere to a magnetic disk substrate with nickel (Ni) alloy plating layer formed on its surface is disclosed. In Japanese Patent Application Laid-open Hei 5-94618, a method of adjusting the roughness of the disk surface by applying a heat treatment to a magnetic disk substrate made of amorphous carbon under the existence of oxidation gas is disclosed. In Japanese Patent Application Laid-open Hei 5-159276, a magnetic disk is disclosed in which the surface is roughed by, for example, anodizing titanium (Ti) or titanium alloy to form titanium oxide (TiO
2
).
However, in a case where the surface of the magnetic disk is made rough as described, the head core part may be damaged when the disk and the head are in contact.
On the other hand, for example, Japanese Patent Application Laid-open Sho 63-37874 and Hei 6-44717 disclose an example of roughing the surface, facing the magnetic disk, of the magnetic head (referred as ABS (Air Bearing Surface) or air bearing surface in the followings). Japanese Patent Application Laid-open Sho 63-37874 discloses, under consideration of the contact area of the ABS and the surface of the magnetic disk, a magnetic head constructed so as to control the contact area smaller than a predetermined value. However, the specific control method is not disclosed. Japanese Patent Application Laid-open Hei 6-44717 discloses, under consideration of the roughness of the ABS, a magnetic head in which the roughness of the surface is limited. However, the specific method for implementing the control of the roughness of the surface is not disclosed therein.
Further, Japanese Patent Application Laid-open Hei 2-95807 discloses a method of obtaining a plurality of magnetic heads by forming a plurality of head cores on a base body made of sintered ferrite and then cutting the base body. With this method, coming-off of the grains from the surface areas of the base body can be prevented by applying a heat treatment to the base body in an oxygen atmosphere. However, articles regarding roughing the ABS is not disclosed.
As represented by the two examples described above, logic of the magnetic head with the roughed ABS has been brought up, however, specific and effective means for implementing it has not been contrived. For example, the ABS can be made rough by polishing the surface using a rough abrasive grain. However, there is a problem with this method that the head core part is damaged while polishing. Accordingly, it is desired to develop a magnetic head with the ABS being roughed without damaging the head core part.
Furthermore, a method of manufacturing alumina-type materials for magnetic head is disclosed in Japanese Patent Application Laid-open Sho 61-50906, however, a method of manufacturing the magnetic head itself and its configuration is not mentioned therein.
SUMMARY OF THE INVENTION
The invention is designed to overcome the foregoing problems. It is an object to provide a magnetic head with a surface (ABS), which is to face a recording medium, being appropriately roughed without damaging the head core part, a method of manufacturing the same, and a magnetic disk apparatus.
A magnetic head of the invention comprises a base body and a head core part formed on the base body including at least either a magnetic head element for writing or a magnetic head element for reading. In the magnetic head, an end face of the base body and an end face of the head core part form a flat surface which is to face a recording medium while the end face of the base body is rougher than the end face of the head core part.
A method of manufacturing a magnetic head of the invention which comprises a base body and a head core part formed on the base body including at least either a magnetic head element for writing or a magnetic head element for reading includes steps of: forming a flat surface including an end face of the base body and an end face of the head core part, the flat surface being to face a recording medium, after forming the head core part on the base body; and selectively roughing the end face of the base body of the flat surface by performing a chemical processing thereon.
A magnetic disk apparatus of the invention comprises a magnetic head which includes a base body and a head co
Chen Tianjie
Nguyen Hoa T.
TDK Corporation
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