JP2904169B2 - Thin film magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thin film magnetic head used for a magnetic disk drive.

[0002]

2. Description of the Related Art A magnetic head for writing or reading an information signal to or from a magnetic disk medium needs to perform floating scanning while maintaining a very small interval on the surface of the magnetic disk medium when performing recording and reproduction. In general, it has an integral structure with a slider having a surface (air bearing surface).

At present, thin-film magnetic heads having an electromagnetic transducer formed by a vacuum thin-film forming technique are mainly used on the end face of the slider. This thin-film magnetic head can use a metal magnetic material having a characteristic of high saturation magnetic flux density as a material of magnetic poles constituting a magnetic circuit, and can generate a high magnetic field. It is suitable for high-density recording and high-speed operation because of its steepness, small magnetic pole volume and low inductance.

[0004] These thin-film magnetic heads are provided with a write head comprising a magnetic pole and a conductor coil irrespective of an inductive head or an MR head.

FIG. 2 is a plan view showing an example of a conventional thin film magnetic head. Referring to FIG. 2, a conventional thin-film magnetic head is formed by forming a vacuum thin film on one side surface (air outflow end side) of a slider 11 formed as a substantially rectangular parallelepiped with a non-magnetic material such as ceramics at right angles to the air bearing surface 12. The magnetic head element is formed by using technology and photolithography technology.

In the magnetic head element, the magnetic core tips 15 of a pair of magnetic cores 14 that are stacked facing each other with a gap film therebetween are flush with the floating surface 12 so as to be close to the floating surface 12. It is provided in the position where it did. The slider 11 has a flying surface 12 for stabilizing the flying state.
A concave portion 16 is provided at the air outflow end.

Further, the magnetic head element is provided with a concave portion 16.
Is formed within the rail width on at least one of the rails 17 protruding on both sides of the rail. The width of the rail 17 must be wider than the coil width of the outermost peripheral portion of the conductor coil 13 formed by spirally surrounding the magnetic core 14. Furthermore, since the magnetic core 14 is formed so that the center of the conductor coil 13 is perpendicular to the magnetic disk surface, the tip of the magnetic core 14 that is flush with the air bearing surface is at least from the widthwise end of the rail 17. It is located at least half the width of the conductor coil 13 inside.

Incidentally, in order to increase the recording density, it is necessary to smooth the surface of the magnetic disk. But,
The smoother the magnetic disk surface, the more easily the magnetic disk surface is attracted by the slider.
In order to prevent this, for example, a method of processing the flying surface into a spherical shape to reduce the contact area between the flying surface and the magnetic disk surface can be considered. At this time, the tip of the magnetic core, which is flush with the air bearing surface, is located at least half the conductor coil width from the end in the width direction of the rail. Either end in the width direction of the rail is narrower.

As described above, in the conventional thin-film magnetic head, the interval between the end in the width direction of the rail and the magnetic disk surface is narrower than the interval between the magnetic disk surfaces at the tip of the magnetic core, so that high recording is possible. When trying to achieve density, there is the danger that reliability will suffer.

[0010]

In the above-mentioned conventional thin-film magnetic head, the distance between the magnetic disk surface and one end in the width direction of the rail is smaller than the distance between the magnetic disk surface and the tip of the magnetic core. , There is a disadvantage that reliability is deteriorated when high recording density is to be achieved.

An object of the present invention is to make the distance between the magnetic disk surface and the tip of the magnetic core equal to the distance between the magnetic disk surface and any one of the ends in the width direction of the rail, thereby improving the reliability without deteriorating the reliability. An object of the present invention is to provide a thin-film magnetic head that achieves a recording density.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a floating thin-film magnetic head having a slider having a positive camber shape in the width direction, wherein the thin-film magnetic head is formed on a side surface orthogonal to a floating surface at an air outflow end of the slider. In a floating thin-film magnetic head that forms an electromagnetic transducer having a magnetic circuit having a gap on the air bearing surface and a conductor coil that spirally winds the magnetic circuit, the center of the gap is defined as the center of the conductor coil. As described above, it is arranged at a position inside a line extending perpendicularly to the magnetic disk surface. As a result, the tip of the magnetic disk surface and the magnetic core
The distance between the ends is either in the width direction of the magnetic disk surface or the rail.
It is almost equal to the distance of the end of the back.

[0013]

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the present invention. Referring to FIG. 1, a thin-film magnetic head according to the present invention has an electromagnetic transducer (hereinafter, referred to as a magnetic head element) on a side surface of an air outflow end of a slider 1 orthogonal to a flying surface 2.
Are formed. In the magnetic head element, the magnetic core tips 5 of the pair of magnetic cores 4 that are stacked opposite to each other via the gap film are flush with the floating surface 2 of the rail 7 so as to be close to the floating surface 2. It is provided in the position where it did. The slider 1 is provided with a recess 6 at the air outflow end of the flying surface 2 in order to stabilize the flying state.

The magnetic head element is formed in at least one of the rails 7 protruding on both sides of the concave portion 6 within the rail width. The flying surface 2 is formed in a positive camber shape in the width direction of the slider 1 in order to prevent attraction with the magnetic disk surface. As a result, when the slider end of the flying surface 2 is compared with the rail end in the direction of the recess 6, the distance between the rail end in the direction of the recess 6 and the magnetic disk surface is smaller.

The magnetic core 4 is spirally wound by the conductor coil 3, and the magnetic core tip 5 of the magnetic core 4 passes through the center of the conductor coil 3 and is pulled perpendicular to the magnetic disk surface. It is located in the direction of the concave portion 6 of the slider 1 relative to the line. Therefore, the distance between the magnetic core tip 5 and the magnetic disk surface is substantially equal to the distance between the end of the rail 7 in the direction of the recess 6 and the magnetic disk surface, and is greater than the distance between the slider end and the magnetic disk surface. short.

As described above, the magnetic core tip 5 is closer to the magnetic disk surface than when it is positioned on a line drawn perpendicularly to the magnetic disk surface through the center of the conductor coil 3 and high recording is achieved. This is advantageous for performing density.

[0019]

As described above, in the thin-film magnetic head of the present invention, the distance between the surface of the magnetic disk and the tip of the magnetic core is substantially equal to the distance between the surface of the magnetic disk and either end of the rail in the width direction. It is equivalent, and the tip of the magnetic core is shifted from the line drawn perpendicular to the magnetic disk surface through the center of the conductor coil, which contributes to higher recording density and higher reliability. .

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an example of a conventional thin film magnetic head.

[Explanation of symbols]

 1,11 slider 2,12 air bearing surface 3,13 conductor coil 4,14 magnetic core 5,15 magnetic core tip 6,16 recess 7,17 rail

Claims (1)

(57) [Claims] 1. A floating thin-film magnetic head comprising a slider having a positive camber shape in the width direction, wherein the magnetic head is formed on a side surface orthogonal to a floating surface at an air outflow end of the slider, and has a gap in the floating surface. In a floating type thin film magnetic head forming an electromagnetic transducer composed of a circuit and a conductor coil which spirally winds this magnetic circuit, the center of the gap is passed through the center of the conductor coil and the surface of the magnetic disk. A thin-film thin-film magnetic head, wherein the thin-film magnetic head is arranged at a position inside a line extending vertically.