JPH04362582A - Thin film magnetic head for magnetic disk device - Google Patents

Abstract

PURPOSE:To sufficiently enable to bring a magnetic head element close to a magnetic disk since no edge of a floating face is project from a magnetic head element by the slight bend of a slider. CONSTITUTION:In a thin film magnetic head for a magnetic disk device forming the magnetic head element to the rear end face of a floating slider, the slider 1 forming the magnetic head element is shaped so that only the central part 2 of the rear end face is project to the magnetic disk side with a sufficiently narrow width, and is constituted so that the magnetic head element is placed to this part.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film magnetic head used in a magnetic disk device used as an external storage device for a computer, and in particular to a thin film magnetic head suitable for increasing the recording density on a magnetic disk. Regarding the head.

0002

[Prior art] Magnetic disk devices have increased capacity, become smaller,
Progress is being made towards speeding up the transfer of information. For this reason, there is a need to increase the recording density on magnetic disks.

It is already well known that a necessary means for increasing the recording density on a magnetic disk is to reduce the flying height of a floating slider. In other words, the magnetic head element is formed at the rear end of the floating slider, and when writing and reading information while maintaining a small gap between it and the magnetic disk, if the flying height is small, it is difficult to record information. The magnetic flux radiated from the tip of the magnetic gap of the magnetic head element is difficult to spread, making it easy to improve resolution. Furthermore, a decrease in magnetic field strength can also be prevented. Therefore, in order to increase the recording density, the distance between the magnetic head element and the recording medium must be brought closer.
It is essential to reduce the flying height of the slider.

[0004] Normally, a tapered flat type slider is used, and on the surface facing the magnetic disk, two rail-shaped flying surfaces for obtaining flying lift are arranged at both ends of the slider, which spans almost the entire width. There is. The width of both air bearing surfaces is determined according to the flying height of the slider, and the lower the flying height, the narrower the width. The rear end of the air bearing surface extends to the rear end surface of the slider, and a magnetic head element is formed on the rear end surface such that the tip of the magnetic gap is exposed at the rear end of the air bearing surface. The flying attitude of the slider is backward tilted, so that the rear end of the flying surface, that is, the tip of the magnetic gap approaches the magnetic disk closest.

[0005]

[Problems to be Solved by the Invention] New problems found in the conventional slider will be explained. That is, there is a phenomenon in which the slider is slightly curved at least in the width direction due to machining, and as a result, the trailing edge of the air bearing surface is lower than the tip of the magnetic head element. This distance is 0.0
It is about 1 μm to 0.02 μm, and has not been a big problem in the past. However, this becomes an obstacle when attempting to reduce the distance between the magnetic head element and the recording medium to around 0.1 μm or less.

An object of the present invention is to provide a thin film magnetic head that overcomes the above-mentioned problems.

[0007]

[Means for Solving the Problems] The above object is to have a shape in which only the center portion of the rear end surface of the floating slider has a sufficiently narrow width and protrudes toward the side of the magnetic disk, and a magnetic head element is formed in that portion. This is achieved by creating a structure that is

[0008] It is desirable that the width of the protruding portion be at most twice the width of the magnetic head element.

[0009]

[Operation] The contents of the present invention will be explained below.

[0010] The protruding portion is located at the center of the rear end surface of the slider and is narrow, so that it is not easily affected by curvature in the width direction of the slider. In other words, even if a bend occurs,
The protruding part rarely hangs up or down. For this reason, the tip of the magnetic head element formed in this portion almost never falls below the edge of the protruding portion. In order to make this more effective, it is better for the width of the protruding part to be narrower, but it is necessary to have at least a width that allows the magnetic head element to be mounted.
It is desirable that the width be approximately twice the width of the magnetic head element or less.

[0011]

[Examples] The present invention will be specifically explained below using examples.

FIG. 1 shows a perspective view of a magnetic head showing an example of the present invention. Air bearing surfaces 2 and 3 are formed on the surface of the slider 1 that faces the magnetic disk. The air bearing surface 3 does not reach the rear end of the slider, and only the air bearing surface 2 reaches the rear end of the slider. The air bearing surface 2 is located at the center of the rear end of the slider, and a magnetic head element is formed on the end surface thereof. As mentioned above, there is a phenomenon in which this slider is slightly curved, and FIG. 2 shows an exaggerated view of this. FIG. 2 is a schematic view of the rear end surface of the magnetic head slider, showing a deformed state of the magnetic head slider. Although this figure shows a state in which the rear end surface is curved upward, the following explanation is exactly the same even if the rear end surface is curved downward. A magnetic head element 4 is formed on the rear end surface of the air bearing surface 2 . In this case, the magnetic disk 5
The distance 6 to the magnetic head element 4 is almost the shortest. Therefore, no problem occurs when the flying height is reduced by changing the dimensions and shapes of the flying surfaces 2 and 3. Furthermore, by ultimately reducing the flying height to zero, the magnetic head element 4
It is also possible to bring the magnetic disk 5 into contact with the magnetic disk 5.

On the other hand, in the conventional case, the shape shown by the broken line in FIG. 2 was common. That is, the rear end of the air bearing surface 3 in FIG. 1 extends to the rear end of the slider, and the air bearing surface 3' in FIG.
form. A magnetic head element 4' is formed on the rear end surface of one or both of the two air bearing surfaces 3'. There is no floating surface 2. In this case, the distance 6' from the magnetic disk 5 to the magnetic head element 4' is not the shortest, but the edge of the air bearing surface 3' is closer. This difference 7 reduces the distance 6' to 0.1 μm.
It becomes an obstacle when trying to make it smaller before or after or below. That is, when the flying height of the slider suddenly decreases due to a disturbance while the slider is flying, or when there is a minute protrusion on the surface of the magnetic disk, the edges of the flying surface are likely to collide. Furthermore, it is impossible to ultimately reduce the distance 6' to zero and bring the magnetic head element into contact with the magnetic disk.

[0014]

According to the present invention, since the magnetic head element and the magnetic disk can be brought sufficiently close to each other, the recording density on the magnetic disk can be increased.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the slider rear end surface showing a deformed state of the magnetic head slider.

[Explanation of symbols]

1...Slider, 2...Air bearing surface, 3... Air bearing surface.

Claims (3)

[Claims] 1. A thin-film magnetic head for a magnetic disk drive in which a magnetic head element is formed on the rear end surface of a floating slider, wherein the surface on which the magnetic head element is formed has a sufficiently narrow width only in the central portion of the surface of the magnetic disk. 1. A thin film magnetic head for a magnetic disk device, characterized in that the head has a shape that protrudes toward the side thereof, and a magnetic head element is located in that portion. 2. A thin film magnetic head for a magnetic disk drive according to claim 1, wherein the width of the protruding portion where the magnetic head element is located is less than twice the width of the magnetic head element. 3. A thin film magnet for a magnetic disk device according to claim 1 or 2, wherein a sliding surface with respect to the magnetic disk is divided into two or more locations including a portion where the magnetic head element is formed on a side surface. head.