JPH1139619A - Magnetic head and magnetic disk device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic disk device with a stable output waveform and high reliability by positioning a magnetic flux detection area of a reproducing head out of the range held between two pieces of perpendiculars put down from both end parts of a gap opposite surface or a recording head Pole the reproducing head while viewing from a floating surface of a slider. SOLUTION: The magnetic flux detection area 4 is arranged out of this range so that the magnetic flux detection area 4 of the reproducing head isn't positioned within the range held between two pieces of perpendiculars put down from both end parts of the gap opposite surface of the magnetic head pole 1 to the reproducing head. The reproducing head is arranged parallel to a substrate surface, and the perpendiculars become vertical to the substrate surface, and the gap opposite surface of the recording head pole 1 may be a curved surface also without limiting to a flat surface. As a sound recording/reproducing separation type, a projection part is provided on a position opposing to the recording head pole of the recording head pole side surface of the upper part magnetic film of the magnetic head, and the magnetic flux detection area 4 may be positioned out of the range held between two pieces of perpendiculars put down from both end parts of the projection part to the reproducing head while viewing from the floating surface of the slider.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive used for an external storage device of a computer and a magnetic head used for the same.

[0002]

2. Description of the Related Art In a conventional recording / reproducing magnetic head, in order to realize high-speed access, the amount of displacement between the center position of a recording head in the track width direction and the center position of a reproducing head in the track width direction is determined by a linear actuator. When used, it was designed to be zero. This will be described with reference to FIG. FIG. 5A is a perspective view of the magnetic head. The slider 7 is fixed to the tip of the suspension 8 of the magnetic head. FIG. 5B is an enlarged perspective view of the slider 7, and FIG. 5C is a schematic partially cutaway perspective view of a portion of the recording head and the reproducing head (portion A in the drawing). Since the direction of the slider is not constant in each drawing, the position of the floating surface is shown in each drawing for reference. As shown in FIG. 5C, between the upper magnetic film 2 and the lower magnetic film 3 for shielding, the magnetic flux detection area 4 of the read head is provided.
Is arranged. The recording head pole 1 is cut away on the right side of the figure, and the center position thereof is configured to be located directly above the center position of the magnetic flux detection area 4 of the reproducing head. In the figure, reference numeral 6 denotes a coil.

On the other hand, FIG. 2 is a schematic diagram showing a positional relationship between a recording head and a reproducing head viewed from the flying surface of a slider when a rotary actuator is used. In this case, since the tangential direction of the track is inclined with respect to the center axis of the slider, reproduction is performed in a range sandwiched between two perpendicular lines lowered toward the reproduction head from both ends of the recording head pole 1 with a middle skew angle. It is designed so that the magnetic flux detection region 4 of the head is included, that is, in this range, the displacement between the two is eliminated. As a related technology,
JP-A-7-65325, JP-A-7-326022
And the like.

[0004]

The magnetic disk drive is required to have high capacity and high reliability. In the magnetic conversion part of the magnetic head, a magnetoresistive (MR) element or a giant magnetoresistive (GMR) element is required. 2.) Recording / reproducing separation type magnetic heads employing elements or the like are becoming mainstream. However, as shown in FIG. 2, the recording head pole 1 and the magnetic flux detection area 4 of the reproducing head have a geometrically overlapping portion when viewed in the vertical direction of the reproducing head. The magnetization of the reproducing element is disturbed by the magnetic field, causing output fluctuation and vertical asymmetry fluctuation, thereby causing a reduction in the reliability and performance of the device.

A first object of the present invention is to provide a magnetic head in which an output waveform from a reproducing element is stabilized. A second object of the present invention is to provide a highly reliable magnetic disk drive using such a magnetic head.

[0006]

In order to achieve the first object, a magnetic head of the present invention is of a recording / reproducing type,
When viewed from the air bearing surface of the slider, the magnetic flux detection area of the read head is located outside the range sandwiched between two perpendicular lines lowered to the read head from both ends of the gap facing surface of the write head pole. It is.

The gap facing surface of the recording head pole may be a curved surface instead of a flat surface. For example, the present invention can be applied even when the recording head pole is a single pole. Further, there is a recording head pole having a width of the gap opposing surface of 1.5 μm or less and 0.1 μm or more. The present invention can be effectively applied to such a recording head pole.

In order to achieve the first object,
The magnetic head of the present invention is a recording / reproducing separation type, in which a convex portion is provided at a position of the upper magnetic film of the magnetic head on the side of the recording head pole facing the recording head pole. 2 which is lowered to the reproducing head from both ends of the projection
The magnetic flux detection area of the reproducing head is located outside the range between the perpendiculars of the book.

There are magnetic heads in which the distance between both ends of the projection is 1.5 μm or less and 0.1 μm or more. The present invention can be effectively applied to such a magnetic head.

In order to achieve the second object,
The magnetic disk device of the present invention includes a magnetic disk, a magnetic head arranged to face the magnetic disk, a rotation control mechanism for the magnetic disk, a positioning mechanism for the magnetic head, and a recording / reproducing signal processing circuit. As this magnetic head, any of the magnetic heads described above is used.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a positional relationship between a recording head and a reproducing head as viewed from a flying surface of a slider of a magnetic head according to an embodiment of the present invention. The magnetic flux detection area 4 of the read head is not located in a range between the two opposing lines of the write head pole 1 facing the gap, that is, both ends of the lower surface of FIG. That is, the magnetic flux detection region 4 is arranged outside this range. The reproducing head is generally arranged parallel to the substrate surface. Therefore, the above perpendicular is a line perpendicular to the substrate surface.

FIG. 3 is a diagram showing the relationship between the offset amount from the center position of the recording head and the strength of the magnetic field flowing into the reproducing element. As is clear from the figure, it can be seen that the magnetic field intensity rapidly attenuates from the position of 1/2 track width from the center position of the recording head, that is, from the position of the edge of the recording head.
Therefore, by arranging the magnetic flux detection area 4 at the above-mentioned position, the magnetic field entering the magnetic flux detection area 4 from the recording head can be made smaller than before.

The gap facing surface of the recording head pole does not have to be a flat surface. In FIG. 1, the side surface of the recording head pole 1 is trapezoidal as shown in the figure, but this shape may be circular. In this case, the gap opposing surface of the recording head pole corresponds to the curved surface of the lower half of the circle, and both ends thereof are both ends of the diameter of the circle.

FIG. 4 is a schematic diagram showing a positional relationship between a recording head and a reproducing head as viewed from the air bearing surface of a slider of a magnetic head according to another embodiment of the present invention. A convex portion is provided on a surface of the upper magnetic film 2 corresponding to the recording head pole 1, and its width in the track width direction is slightly smaller than the gap opposing surface of the recording head pole 1. In this type of magnetic head, it is said that the magnetic field from the recording head does not spread in the track width direction.

In this magnetic head, the magnetic flux detection region 4 of the reproducing head is not positioned within a range sandwiched between two perpendicular lines lowered from both ends of the convex portion toward the reproducing head.
That is, the magnetic flux detection region 4 is arranged outside this range.

FIG. 2 shows an example in which the convex portion is slightly narrower than the gap opposing surface of the recording head pole 1. However, if the convex portion is slightly wider than the gap opposing surface, for example, the line drawn from the gap opposing surface is 5 degrees below the gap. In some cases, both ends of the convex portion may be located at positions that are spread by 10 degrees. At this time, as shown in FIG.
It is effective to locate the magnetic flux detection region 4 outside the range between the two perpendiculars lowered to the read head from both ends of the gap opposing surface. It is more effective if the magnetic flux detection region 4 is located outside the range between the perpendiculars of the book.

FIG. 6 is a perspective view of a magnetic disk drive according to one embodiment of the present invention. A plurality of magnetic disks 10 on which information is magnetically recorded are inserted into a spindle unit 11 and driven to rotate by a spindle motor (not shown). A magnetic head 12 for magnetically writing or reading information floats on the surface of the rotating magnetic disk 10 in a near contact or contact state and is positioned. The positioning of the magnetic head 12 is performed by the voice coil motor 14 via the actuator 13. The signal when reading / writing the magnetic head is
By the electromagnetic conversion coil provided on the magnetic head 12,
A signal at the time of reading / writing is transmitted to a read / write amplifier which controls the signal, and is transmitted to an outside of an HDA (head disk assembly) by a sealed connector provided on a lower surface of the read / write amplifier. This sealed connector is transmitted to a circuit board for controlling a magnetic disk drive provided outside the HDA.

By using any of the magnetic heads described above as the magnetic head 12 of this magnetic disk drive, a highly reliable magnetic disk drive could be obtained.

[0019]

As described above, the magnetic recording / reproducing type magnetic head according to the present invention can reduce the magnetic field from the recording head as compared with that of the prior art, thereby stabilizing the output waveform from the reproducing element. Was able to be transformed. Also,
The reliability of the magnetic disk drive of the present invention can be improved by using any one of the above magnetic heads.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a positional relationship between a recording head and a reproducing head as viewed from a flying surface of a slider of a magnetic head according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a positional relationship between a recording head and a reproducing head as viewed from a flying surface of a slider of a conventional magnetic head.

FIG. 3 is a diagram illustrating a relationship between an offset amount from a recording head center position and a magnetic field intensity flowing into a reproducing element.

FIG. 4 is a schematic diagram showing a positional relationship between a recording head and a reproducing head as viewed from a flying surface of a slider of a magnetic head according to another embodiment of the present invention.

FIG. 5 is a perspective view of a conventional magnetic head, an enlarged perspective view of a slider thereof, and a schematic partial cutaway perspective view of a recording head and a reproducing head thereof.

FIG. 6 is a perspective view of a magnetic disk drive according to one embodiment of the present invention.

[Description of Signs] 1 ... Recording head pole 2 ... Upper magnetic film 3 ... Lower magnetic film 4 ... Magnetic flux detection area 6 ... Coil 7 ... Slider 8 ... Suspension 10 ... Magnetic disk 11 ... Spindle unit 12 ... Magnetic head 13 ... Actuator 14 … Voice coil motor

Claims (3)

[Claims] 1. A recording / reproducing separation type magnetic head, as viewed from the floating surface of a slider, outside a range sandwiched between two perpendiculars lowered to a reproducing head from both ends of a gap facing surface of a recording head pole. Wherein a magnetic flux detection area of the reproducing head is located. 2. A recording / reproducing separation type magnetic head, wherein a surface of an upper magnetic film of the magnetic head on a recording head pole side has a convex portion at a position facing the recording head pole, and a flying surface of a slider. A magnetic head characterized in that a magnetic flux detection area of the reproducing head is located outside a range sandwiched between two perpendicular lines drawn from both ends of the projection to the reproducing head. 3. A magnetic disk for recording information, a magnetic head arranged to face the magnetic disk for writing information on or reading information from the magnetic disk, and a rotation control mechanism for the magnetic disk 3. A magnetic disk drive having a magnetic head positioning mechanism and a recording / reproducing signal processing circuit, wherein the magnetic head is the magnetic head according to claim 1 or 2.