JPH05144209A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To improve follow-up characteristics by forming a floating surface of a slider in a flat state over the entire surface. CONSTITUTION:A floating surface 105 of a slider 1 is opposed to a magnetic recording medium, and a reader/writer 2 is mounted. The floating surface is formed substantially in a flat state over the entire surface. Accordingly, when a loading point is set to an intermediate part of the slider, floating amounts become substantially equal at air input and output sides thereby to avoid a front lowering. Even if the floating amount is 0.2mum or less, it is scarcely crashed, and magnetic head having high recording density can be obtained. Since the floating surface is flat over the entire surface, masses are balanced before and after the loading point set to the intermediate part of the slider, an inertial moment of the entire head is reduced. and a high speed follow-up can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying type magnetic head, in which the flying surface of a slider is formed into a flat surface without a tapered surface over the entire surface thereof, so that even if the flying height is reduced, The present invention is intended to provide a high-speed response flying type magnetic head, which is less likely to crash between the two, is suitable for high-density recording, and has excellent followability.

[0002]

2. Description of the Related Art A floating magnetic head uses a dynamic pressure generated by the viscosity of air when moving relative to a magnetic disk to generate a small flying height between the magnetic head and the magnetic disk surface. For example, a Winchester type magnetic head, a composite type magnetic head, a thin film magnetic head or a MIG type magnetic head is known. As shown in FIG. 6, its basic structure is such that the read / write element 2 is attached to the end surface of the slider 1 made of a ceramic structure.

The slider 1 has air bearing surfaces 103 and 104 formed on the surfaces of rail portions 101 and 102 which are provided on the surface facing the magnetic disk with a space therebetween, and the slider 1 is tapered at the tip of the air bearing surfaces 103 and 104. The so-called taper, which is provided with the surfaces 103a and 104a. It is a flat type. The rail portions 101 and 102 are formed at intervals so as to prevent swinging in the left-right direction and ensure floating stability.

When used as a magnetic disk device,
The flying type magnetic head is mounted on the tip of a support spring (gimbal), and the flying surfaces 103 and 104 of the slider 1 are arranged so as to face the surface of the magnetic disk. When the magnetic disk is stationary, the air bearing surfaces 103 and 104 are pressed against the surface of the magnetic disk by the spring pressure of the support spring, but when the magnetic disk rotates, the flying surface including the taper surfaces 103a and 104a of the slider 1 flies. surface
Lifting dynamic pressure is generated at 103 and 104, and the surface is levitated with a floating amount that balances this dynamic pressure and the spring pressure of the support spring.

The dynamic pressure generated in the magnetic head is generated by the slider 1
Dimensions of the air bearing surfaces 103 and 104 of the rails 101 and 102 of the
It is determined by the taper angles and dimensions of 103a and 104a, the relative movement speed with respect to the magnetic disk, and the like. Therefore, conventionally, by appropriately designing the areas of the air bearing surfaces 103 and 104 of the rail portions 101 and 102 of the slider 1, the taper angles of the tapered surfaces 103a and 104a, and the spring pressure of the support spring, a predetermined flying height can be obtained. I was trying to get it.

[0006]

By the way, in this type of floating magnetic head, the flying loss tends to become smaller and smaller in order to reduce the spacing loss and achieve a high recording density. Further, in combination with a computer, high-speed followability is required in order to cope with an increase in data transfer rate.

However, the above-mentioned taper. Since the flying magnetic head using the flat slider has the tapered surfaces 103a and 104a at one end side when viewed in the air flow direction,
As shown in FIG. 7, when a spring load P is applied to the middle portion of the slider 1, the tapered surfaces 103a and 104a are bounded by the load point.
There is a difference in the generated dynamic pressure between the air inflow side with air and the air outflow end side, and the floating amount on the air inflow side with the tapered surfaces 103a and 104a is smaller than that on the air outflow end side. For this reason, as shown by the dotted line in FIG. 7, the magnetic head as a whole has a forward curling tendency, and there is a problem that a crash with the magnetic disk 3 is likely to occur. This problem is particularly likely to occur when the flying height is reduced in order to deal with high recording density.

Further, with the load point as a boundary, the tapered surface 103
Since the air inflow side with a and 104a and the air outflow end side have different masses, the moment of inertia of the air inflow side and the moment of inertia of the air outflow side are unbalanced around the load point, and the entire magnetic head The moment of inertia seen as is substantially increased. Therefore, the followability becomes poor, and it becomes difficult to satisfy the high-speed followability to cope with the speeding up of data transfer.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, to prevent a crash with a magnetic disk even when the flying height is reduced, suitable for high-density recording, and capable of high-speed follow-up. It is to provide a possible flying magnetic head.

[0010]

In order to solve the above-mentioned problems, the present invention provides a flying magnetic head in which a read / write element is attached to a slider having an air bearing surface on the side facing the magnetic recording medium. The air bearing surface is characterized in that it is flat over the entire surface.

[0011]

Since the air bearing surface of the slider is flat over the entire surface, when the load point is set in the middle portion of the slider, the dynamic pressure is balanced before and after the load point, and the flying height is increased by air inflow. And becomes substantially equal on the outflow end side. For this reason, the tendency to curl before is avoided, and even if the flying height is reduced to, for example, 0.2 μm or less in order to improve the recording density, the crash hardly occurs.

Further, if the air bearing surface of the slider is made flat without a taper surface, when the load point is set at the middle portion of the slider, the mass before and after the load point is balanced,
The moment of inertia becomes substantially equal on the air inflow and outflow end sides. Therefore, the moment of inertia of the magnetic head as a whole is reduced, the followability is improved in relation to the magnetic disk, and a high-speed follow-up magnetic head is obtained.

The present invention can be applied to almost all flying magnetic heads such as a Wentchester type magnetic head, a composite type magnetic head, a thin film magnetic head or a MIG type magnetic head.

[0014]

1 is a perspective view of a floating magnetic head according to the present invention. In the figure, the same reference numerals as those in FIG. 6 denote the same components. In this embodiment, in the slider 1, the air bearing surface 105 is formed over the entire surface in a plane shape having no rail portion.

FIG. 2 shows another embodiment, in which rail portions 101 and 10 are provided.
The entire surface of the air bearing surface 103, 104 formed on the upper surface 2 is flat without a tapered surface.

In any of the embodiments, since the entire surface of the air bearing surface 103-105 of the slider 1 is a flat surface without a taper surface, when the load point is set in the middle portion of the slider 1. , The dynamic pressure generated before and after the load point is balanced, the flying heights are substantially equalized, the forward leaning phenomenon is avoided, and the crash is less likely to occur.

Further, if the air bearing surface 105 of the slider 1 is made flat without a taper surface, the mass is balanced before and after the load point set in the middle portion of the slider 1, and the moment of inertia flows in and out of air. It becomes substantially equal on the end side. Therefore, the moment of inertia of the magnetic head as a whole is reduced, the followability is improved, and a high-speed follow-up magnetic head is obtained.

FIG. 3 shows the conventional floating magnetic head Acoustic. Emission. Sensor (hereinafter A
FIG. 4 is a diagram showing flying stability measurement data by an AE sensor of the flying type magnetic head according to the present invention shown in FIG. 1, and FIG. The measurement data of FIGS. 3 and 4 are obtained by the measurement system as shown in FIG.

In FIG. 5, 3 is a magnetic disk, 4 is a spindle for rotating the magnetic disk 3, 5 is a floating magnetic head, 6 is a support spring for supporting the floating magnetic head 5, 7 is an AE sensor, and 8 is Filter, 9 is amplifier, 10
Is an oscilloscope. The measurement conditions in FIG. 5 are as follows.

Levitation amount of the floating magnetic head 5; 0.18 μm Measurement frequency; 150 kHz to 400 kHz Amplification factor; 60 dB Surface smoothness of the magnetic disk 3; Rmax <100 Å Oscilloscope 10; X axis 5 sec / div Y axis 50 mv / div As shown in the measurement data of FIG. 3, in the conventional flying type magnetic head, a large AE sensor output as high as 100 mv occurs at a flying height of 0.18 μm. From this,
Taper. It is understood that when the flying height of the conventional flying type magnetic head using the flat type slider is as low as 0.18 μm, the flying posture is collapsed and the flying surface collides with the surface of the magnetic disk.

On the other hand, in the flying type magnetic head according to the present invention, as shown in FIG. 4, almost no AE sensor output occurs. From this, it is understood that the flying magnetic head according to the present invention can obtain stable flying characteristics without losing the flying posture even when the flying height is as low as 0.18 μm.

[0022]

As described above, according to the present invention, in a flying magnetic head in which a read / write element is attached to a slider having an air bearing surface on the side facing the magnetic recording medium, the air bearing surface of the slider is Since the entire surface is substantially flat, the following effects can be obtained. (A) Since the air bearing surface of the slider is flat over the entire surface, when the load point is set in the middle portion of the slider, the flying height becomes substantially equal on the air inflow and outflow end sides, and the forward leaning tendency tends to occur. Is avoided, and the flying height is set to 0.
It is possible to provide a magnetic head compatible with high recording density, which is unlikely to cause a crash even when the magnetic head is reduced to 2 μm or less. (B) Since the air bearing surface of the slider is flat over the entire surface, the mass balance between before and after the load point set in the middle portion of the slider is small, and the moment of inertia of the magnetic head as a whole is small, A magnetic head capable of high-speed tracking can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a floating magnetic head according to the present invention.

FIG. 2 is a perspective view of another embodiment of the flying magnetic head according to the present invention.

FIG. 3 is a diagram showing flying stability measurement data by an AE sensor of the conventional flying type magnetic head shown in FIG.

FIG. 4 is a diagram showing flying stability measurement data by an AE sensor of the flying magnetic head according to the present invention shown in FIG.

5 is a diagram showing a measurement system for obtaining the measurement data of FIGS. 3 and 4. FIG.

FIG. 6 is a perspective view of a conventional floating magnetic head.

FIG. 7 is a diagram showing a problem of a conventional flying type magnetic head.

[Explanation of symbols]

 1 slider 2 read / write element 103, 104, 105 air bearing surface

Claims (1)

[Claims] 1. In a flying magnetic head having a read / write element attached to a slider having an air bearing surface on the side facing the magnetic recording medium, the air bearing surface of the slider is planar over the entire surface. A levitation type magnetic head characterized in that