JPH03254411A - Floating magnetic head and recording system for magnetic disk device - Google Patents

Abstract

PURPOSE:To improve the reliability of servo information by arranging 1st and 2nd magnetic head cores fixed to one slider while the azimuth angle of the cores is tilted nearly in axial symmetry with respect to the center line of the slider in the running direction and selecting the center interval of the head cores to be an odd number of multiple of the track pitch. CONSTITUTION:The 1st and 2nd magnetic head cores 7, 8 are arranged while the azimuth angle of the cores is tilted nearly in axial symmetry with respect to the center line of a slider 5 in the running direction of the slider 5, the 1st and 2nd magnetic head cores 7, 8 are made of a nonmagnetic material, imbedded in the rear side of the floating face of the slider 5, fixed by an adhesives 6 such as glass and the interval between the centers of the two magnetic head cores 7, 8 is set to an odd number of multiple of a track width TW. Thus, the information density of a servo track is decreased more than that of a conventional device, and the width of the servo track is widened up to nearly twice. Thus, the reliability of servo information is improved and the magnetic head is controlled accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a floating magnetic head and a recording method for a magnetic recording device.

BACKGROUND OF THE INVENTION In recent years, magnetic recording devices have been used in a wide range of fields for the purpose of storing data, and high-density magnetic recording technology has made remarkable progress as miniaturization and capacity increases.

Hereinafter, a conventional floating magnetic head and a recording method of a magnetic disk device will be explained with reference to the drawings.

FIG. 5 is a bottom view showing the structure of a conventional magnetic head, in which a magnetic head core 14 is fixed to the rear of the air bearing surface of a slider 12 made of a non-magnetic material with an adhesive such as glass.

FIG. 4 shows a perspective view of the structure of the magnetic head core. As shown in the figure, cores 8 and 9 made of magnetic material are 5i0
A recording/reproducing gap 10 is formed by sandwiching a thin film of a non-magnetic material such as No. 2, and the surface of this gap 1o is formed at an angle of 90 degrees with respect to the running direction of the head.

A high-density recording method using such a conventional magnetic head will be explained. Generally, in a magnetic disk drive, a plurality of magnetic disks are fixed to the same rotating shaft and rotate.The - side of the disks is used as a servo surface to control the tracking of the magnetic head for recording and reproduction, and the other surfaces are used as data surfaces for storing data. Dedicated to recording and playback. Position information of data on the data surface is recorded in advance on the tracks of the servo surface, and the scanning of the recording/reproducing magnetic head is controlled by the information of the servo head that scans this servo surface.

One of the conventional high-density recording methods is the guard band method shown in FIG. 6, in which data is recorded by the magnetic head on tracks occupying a certain width on the magnetic film on the data surface of the magnetic disk. An unrecorded area, ie, a guard band, is provided between tracks to prevent crosstalk due to tracking errors of the magnetic head. However, because a guard band is provided, this method cannot be said to be suitable for high-density recording.

Another conventional high-density recording method is the azimuth recording method.

In the conventional azimuth recording/reproducing method, as schematically shown in the track configuration diagram in FIG.
A recording/reproducing gap between a first magnetic head core and a second magnetic head core fixed to each magnetic head is 10[deg.] in opposite directions in the running direction of the head.
It is set at an angle of 45 degrees from These two independent magnetic heads perform recording and reproduction with alternating phases of tracks on the data surface.

In this method, since the azimuths of adjacent tracks are not parallel to each other, crosstalk can be prevented even if there is tracking deviation of the head, and it is suitable for high-density recording.

Problems to be Solved by the Invention Among the conventional recording methods of magnetic heads and magnetic disk drives, the guard band method is unsuitable for high-density recording, and the azimuth recording method requires two magnetic heads to operate independently. As a result, individual tracking control is required for each, making the control mechanism complicated, and the data density of the servo surface also needs to be high enough to match the recording density of the data surface.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a magnetic head and a recording method thereof that can perform azimuth recording with simple control.

Means for Solving the Problems In order to achieve the above objects, the present invention provides (1) fixing a first magnetic head core and a second magnetic head core to one floating body (slider), The azimuth angles of the magnetic head cores are arranged so as to be substantially line symmetrical with respect to the center line in the running direction of the slider, and the distance between the center of the first head core and the center of the second head core is an odd multiple of the track pitch. (2) a magnetic disk device comprising the magnetic head described above and a track for controlling the first or second magnetic head core on the servo surface of the magnetic disk device; The recording method is azimuth recording on the data surface.

Operation According to the present invention, two magnetic head cores are controlled simultaneously on one servo track to perform azimuth recording using the above-described configuration.

Embodiment FIG. 1 shows a recording method of a floating magnetic head and a magnetic disk device according to an embodiment of the present invention.

This will be explained with reference to FIGS. 2 and 3. FIG. 1 is a perspective view showing the structure of a magnetic head core according to an embodiment of the present invention. Note that although a case will be described below in which the track pitch on the data surface and the track @TW are the same, the configuration of the apparatus can be easily developed even in the case where the two are different for reasons of design. As shown in the figure, magnetic cores 1 and 2 made of an oxide magnetic material or the like are replaced with a non-magnetic material such as 5
A gap 3 for recording and reproduction is formed by sandwiching a thin film such as 102. The surface of this gap 3 is set to be inclined at about 10 degrees to 46 degrees with respect to the traveling direction when scanning the disk surface for the purpose of azimuth recording.

FIG. 1 is a bottom view showing the structure of a magnetic head according to an embodiment of the present invention. As shown in the figure, the first magnetic head core 7
A second magnetic head core 8 is formed of a non-magnetic material, embedded in the rear part of the air bearing surface of the slider 5, and glued with an adhesive 6 such as glass.
The distance between the centers of the two magnetic head cores is set to an odd multiple of the track width TV. The width of the magnetic head core and the spacing are precisely set by processing means such as ion milling.

FIG. 3 is a track configuration diagram of a recording method using a magnetic head according to an embodiment of the present invention. In the figure, part of the track group 11 recorded azimuthally on the data surface is track n−
1 to track n-)-2N-)-3 (where N is an integer) 1, and on the other hand, the control data track on the servo surface is set at a position corresponding to the first head of the track on the data surface. The figure shows how it is done. The twisted magnetic head is also illustrated with two magnetic head cores corresponding to positions n and n-1-2N-1-1 of the track on the data surface, respectively. However, their structural arrangement is not on one side as shown in this figure, and the servo head is also omitted.

Only one servo track is provided corresponding to the track pair scanned by the negative pair of magnetic head cores.

To explain the operation in the above configuration, the distance between the first magnetic head core and the second magnetic head core is equal to the track width T.
Since it is set to an odd multiple of V, when the magnetic head is controlled by track n of track 12 on the servo surface 1o and the first magnetic head core is on track n, the second magnetic head core is on track n -1-. It is located at 2N+1. (N: an integer) Therefore, when the first magnetic head performs azimuth recording on track n, the second magnetic head core records on track n-J-2N-1-1 with an opposite azimuth. When the first magnetic head core records track n-)-2 on servo track n+1, the second magnetic head core records n-4-2+2N+, 1=n+2
Record N-1-3. Such a recording operation creates tracks with alternating azimuths on the data surface.

As can be seen from the figure, the number of servo tracks may be half the number of data tracks.

The reproduction operation can also be performed in the same manner as the above-mentioned operation.

Thus, according to the present invention, the number of servo tracks can be half of the number of conventional servo tracks, and therefore the information density of the servo tracks can be lowered even more than that of the conventional device. The width can be expanded by about 2 times 1, and the control signals can be arranged with a margin, which not only improves the reliability of servo information and makes the control of the magnetic head more accurate, but also makes the control device simpler. Since only one magnetic head is targeted, a simple effect can be obtained.

Since the width of the servo track can be set twice as wide as that of the conventional housing, there is also the effect of improving the durability of the servo surface.

Effects of the Invention According to the present invention, the number of servo tracks can be reduced to half of the number of conventional servo tracks, and the information density of the servo tracks can be configured to be lower than that of conventional recording devices, thereby increasing the reliability of servo information. Since the direction control device targets only a single magnetic head, it has the effect of being simple, and
This also has the effect of improving the durability of the servo surface.

Furthermore, the width of the servo track can be set twice as wide as the conventional one, making it easier to create the servo surface.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the structure of a magnetic head core according to an embodiment of the invention, FIG. 2 is a bottom view showing the structure of a magnetic head according to an embodiment of the invention, and FIG. 3 is an embodiment of the invention. Fig. 4 is a perspective view showing the structure of a conventional magnetic head core; Fig. 6 is a bottom view showing the structure of a conventional magnetic head; Fig. 6 is a conventional magnetic disk FIG. 7 is a track configuration diagram in the guard band system of the apparatus. FIG. 7 is a track configuration diagram in the conventional azimuth recording system. 6...Slider, 7...First magnetic head core, 8 ゛°----Second magnetic head core, 9
...Data side. 13...Magnetic head, 14...Track pitch, 16...Azimuth angle i, 16...
...Center line of the slider.

Claims (2)

[Claims] (1) A first magnetic head core and a second magnetic head core are fixed to one slider, and the azimuth angles of the first and second magnetic head cores are tilted approximately symmetrically to each other with respect to the center line in the running direction of the slider. The floating magnetic head is arranged such that the distance between the centers of the head cores is an odd number multiple of the track pitch. (2) A magnetic disk device comprising the magnetic head according to claim 1, wherein a track for controlling the first or second magnetic head core is provided on the servo surface of the magnetic disk, and the magnetic head performs azimuth recording on the data surface. A recording method used by magnetic disk devices.