JPH09198635A - Magnetic head slider - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the floating traveling sufficiently stable and to provide a proper floating amount even when a magnetic head slider is placed in a spot having a level difference from the sea level by providing spare negative pressure grooves communicated with a main negative pressure groove sandwiching an introducing groove. SOLUTION: A slope 13 is formed in the front end part of each of side rails 12 on the both edge sides of a slider main body 10 and an introducing groove 14 is formed between the front sides of both side rails 12. Spare negative pressure grooves 16 and 16 each communicated with the introducing groove 14 and having a width larger than that of the introducing groove 14 sandwiching the introducing groove 14 are formed, communicated with a main negative pressure groove 15 and the rear part of the main negative pressure groove 15 is formed so as to be narrowed backward. The rear end part of the side rail 12 is formed so as to gradually widened and the side rail 12 is used as a positive pressure generation section while the main negative pressure groove 15 and the spare negative pressure groove 16 are used as negative pressure generation sections.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head slider that floats on a magnetic recording medium at minute intervals to record and reproduce magnetic information, and more particularly to a technique capable of stabilizing the flying characteristic.

[0002]

2. Description of the Related Art Conventionally, as a magnetic recording device for a computer, a magnetic disk device as shown in FIG. 7 is known. This magnetic disk device has a structure in which a magnetic head 2 is arranged oppositely on a disk-shaped magnetic disk 1 that is rotatably provided, and the magnetic head 2 is supported by a support arm 4 via a triangular spring plate 3. The magnetic head 2 is supported and is configured so that the magnetic head 2 can be moved to a desired position in the diametrical direction of the magnetic disk 1 by a rotation operation around the rotation center portion 4a of the support arm 4.

In the magnetic disk device having the structure shown in FIG. 7, when the magnetic disk 1 is stopped, the magnetic head 2
The bottom surface of the magnetic disk is lightly pressed against the magnetic disk 1 by the urging force of the spring plate 3 that supports the magnetic head 2. When the magnetic disk 1 is rotated, the magnetic field is generated by using the air flow generated by the rotation. The head 2 is configured so as to fly over the magnetic disk 1 at a predetermined height, and when the rotation of the magnetic disk 1 is stopped, the magnetic head 2 that was running while flying again contacts the magnetic disk 1 and is stopped. However, it is configured such that magnetic information is read from and written to the magnetic recording layer of the magnetic disk 1 at the time of flying as described above,
This series of operating conditions is usually called CSS (contact start stop).

FIG. 8 and FIG. 9 show a floating running state of a two-rail type magnetic head 2 which is widely used at present. The bottom surface of the magnetic head 2 is provided with one groove 5 in the central portion. Then, side rails 6, 6 are formed on both sides thereof, and an inclined surface 6a is formed on the tip lower surface side of each side rail 6 (upstream side in the rotation direction of the magnetic disk 1). As shown by an arrow A in FIG. 8, the bottom surface of the side rail 6 of the magnetic head 2 serves as a positive pressure generating portion when air flows in, so that the magnetic head 2 floats. In addition, as shown by the chain double-dashed line in FIG.
A negative pressure groove 6b is formed on the bottom surface of the magnetic field, and the negative pressure generated in the negative pressure groove 6b and the positive pressure generated in the side rails 6, 6 are balanced to stabilize the floating running performance. The configuration of the head is also known.

By the way, FIG. 8 shows the state in which the magnetic head 2 is viewed from the side surface side, and FIG. 9 shows the state in which the magnetic head 2 is viewed from the rear side. When the magnetic head 2 is flying, the inclined surface is shown. When the air flows into the bottom surface side of the magnetic head 2 via 6a and further the negative pressure groove 6b is formed, a negative pressure is generated on the rear side of the magnetic head. The inflow side is lifted upward, and the vehicle is levitating while tilting at a slight angle, and this tilt angle is generally called a pitch angle (α: usually about 100 μRad).
In addition, as shown in FIG. 9, when the magnetic head 2 in the floating traveling state is viewed from the rear, the angle at which the magnetic head 2 tilts to the left and right is called the roll angle (β). On the other hand, when the magnetic head 2 is moved to the position shown by reference numeral 2'in FIG. 7 by the rotation of the support arm 4, the center line of the magnetic head 2 (the side surface of the magnetic head 2 passing through the center of the magnetic head 2). The line a parallel to the magnetic head 2 does not coincide with the tangent line b of the magnetic disk 2 passing through the center line portion of the magnetic head 2, but the angular deviation in this case is called the skew angle (γ), These pitch angle, roll angle and skew angle are one of the driving stability.
It is used as one guide.

[0006]

In the magnetic head 2 having the above-described structure, it is advantageous that the magnetic head 2 approaches the magnetic recording layer of the magnetic disk 1 from the viewpoint of magnetic recording. It is desirable to make the height of the magnetic head 2 as low as possible during floating operation so that the magnetic head 2 does not collide with fine foreign matter such as dust on the magnetic disk 1 from the viewpoints of stability and reliability of floating operation. Therefore, there is a conflicting requirement that it is desirable to make the height during levitation as high as possible, and at present, the levitation height is set by taking a compromise point of these conflicting requirements.

However, in the magnetic disk 1, the peripheral speed is different between the inner peripheral side and the outer peripheral side, and the amount of air flowing into the bottom side of the magnetic head 2 is also different.
The flying height is different between the inner circumference side and the outer circumference side of the magnetic disk 1. Moreover, since the skew angle γ of the magnetic head 2 is different between the inner peripheral side and the outer peripheral side of the magnetic disk 2 due to the rotation of the support arm 4, the positive pressure generated on the two side rails 6 of the magnetic head 2 may be different. Therefore, there is a problem that the pitch angle α and the roll angle β of the magnetic head 2 become unstable due to the combined effects of these.

From the above background, even when the skew angle γ of the magnetic head 2 changes, that is, regardless of where the magnetic head moves to the inner or outer circumference side of the magnetic disk, the pitch angle is changed. Although it is desired to develop a magnetic head that has a small effect on the roll angle and a stable flying height, the conventional magnetic head 2 having two side rails 6 has a skew angle. The roll angle and the pitch angle change sensitively to the change of.

Therefore, conventionally, in addition to the positive pressure generating portion mainly composed of the side rails, a negative pressure generating portion is formed by forming a U-shaped rail portion or groove on the center side of the bottom surface of the magnetic head. There is known a magnetic head having a structure that attempts to stabilize the floating running state by skillfully balancing the pressure and the negative pressure. This type of magnetic head is disclosed in JP-A-6-44719, JP-A-6-124562, JP-A-6-195916,
It can be found in Japanese Patent Laid-Open No. 6-215516. However, even in the magnetic heads according to these patents, for example, when the atmospheric pressure at the place where the magnetic head is installed is low, that is, when the magnetic head is used in a low pressure state due to the influence of the altitude difference of the installation place, running stability is insufficient. Could occur.

The present invention has been made in view of the above circumstances, and even when it is installed in a place having a large difference in altitude, the running stability can be sufficiently stabilized and an appropriate flying height can be secured. An object is to provide a magnetic head slider.

[0011]

In order to solve the above-mentioned problems, a magnetic head core is provided in a plate-shaped slider body, and the magnetic head core is floated on a magnetic disk to write magnetic information. Alternatively, in a magnetic head for reading, side rails extending from the front side to the rear side of the slider body are formed on both edge sides of the medium facing surface on the magnetic disk side of the slider body. An inclined surface is formed at the front end, an introduction groove is formed between the front sides of both side rails, and a reserve wider than the introduction groove communicates with the introduction groove between the center part and the rear side of both side rails. A negative pressure groove is formed, and the rear side of the preliminary negative pressure groove is formed in a rearward constricted shape to reach the rear end of the slider body, and both sides of the communication portion between the introduction groove and the preliminary negative pressure groove are adjacent to this communication portion. From A main negative pressure groove extending toward the front end side of the drail and communicating with the preliminary negative pressure groove is formed side by side with the introduction groove, while a rear end side of the side rail is formed in a divergent shape. The side rail is a positive pressure generating portion, and the preliminary negative pressure groove and the main negative pressure groove are negative pressure generating portions.

In the above construction, it is preferable that the inclination angle of the inner inclined portion in the divergent portion of the rear end portion of the side rail is 33 to 37 °. Further, in the above configuration, it is preferable that a cutout portion is formed on a side surface side of the rear end portion of the side rail. Further, in the above structure, it is preferable that the leading end side of the main negative pressure groove located on the front side of the slider body is formed in a tapered shape.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of a magnetic head slider according to the present invention. A magnetic head slider S of this example comprises a plate-shaped slider body 10 and a magnetic core 11 having a structure to be described later. The parts other than the magnetic core part are entirely composed of a substrate made of ceramics or the like, and are used similarly to the conventional magnetic head shown in FIG. The bottom surface (the upper surface in FIGS. 1 and 2 and the medium facing surface facing the magnetic disk) of the slider body 10 is located on both side edge portions thereof and extends from the front side to the rear side of the slider body 10. Two side rails 12 are formed. In the present specification, the upper side of the slider body 10 in FIG. 1 is referred to as the front side of the slider body 10, and this front side is generally referred to as the leading side of the slider, and the air flow from the magnetic disk flows in. On the contrary, the lower side of the slider body 10 in FIG. 1 is referred to as the rear side of the slider body 10, and this rear side is generally referred to as the trailing side of the slider, and the air flow from the magnetic disk flows out. On the side.

The side rails 12 are formed such that the front end side is wide and the central part side is narrow, and the side rails 12 gradually widen from the central part to the rear end part. A rectangular slanted surface 13 is formed at the tip of each side rail 12, and an elongated guide groove 14 of equal width is formed between the side rails 12 on both sides while being sandwiched between the side rails 12, 12. On the rear side of the introduction groove 14, a preliminary negative pressure groove 15 is formed which communicates with the introduction groove 14 while being sandwiched between the side rails 12, 12. The preliminary negative pressure groove 15 is formed wider than the introduction groove 14, and the rear side thereof is formed in a rearward constricted shape by being sandwiched by the flared end portions of the side rails 12. Further, the communicating portion 14a between the introduction groove 14 and the preliminary negative pressure groove 15
Main negative pressure grooves 16 and 16 extending from these portions to the front side of the side rail 12 are formed on both sides of the main rail so as to be aligned with the introduction groove 14. The main negative pressure grooves 16 and 16 are formed in a trapezoidal shape in a tapered shape.
Introducing pieces 17 are formed on both sides of the introducing groove 14 so as to be sandwiched between. By forming the introduction piece 17 in this way, negative pressure is effectively generated in the main negative pressure grooves 16, 16.

The inclination angle ε of the tapered portion on the tip end side of the main negative pressure groove 16 on the side of the introduction piece 17 may be any angle, but if this angle is increased, the main negative pressure groove 16 Since the area becomes smaller, the area of the main negative pressure groove 16 can be adjusted by adjusting the angle ε. In the example of this figure, the areas of the left and right main negative pressure grooves 16 are the same, but the areas of the left and right main negative pressure grooves 16 may be formed differently. By forming in this way, the roll angle β of the slider body 10 can be adjusted. Further, since the main negative pressure groove 16 is formed in a tapered shape, the pitch angle α becomes large. Therefore, the slider body 10 can be quickly levitated when the magnetic disk is started. Further, the roll angle β can be efficiently adjusted by adjusting the inclination angle ε ′ of the main negative pressure grooves 16, 16 on both side edges of the slider together with the inclination angle ε. By appropriately setting the width of the side rail 12 at the end surface portion to adjust the positive pressure, appropriately setting the inclination angles ε and ε ′, and adjusting the negative pressure, the magnetic disk 1 is subjected to the inner peripheral surface side to the outer peripheral surface. It is possible to keep the roll angle β constant on all tracks.

Next, the outer side portion 1 of the side rail 12
8 is formed in a linear shape over substantially the entire length of the side rail 12, and a linear step portion 20 is formed beside the side portion 18 of the side rail 12 over the entire length of the slider body 10. In addition, the central portion of the side rail 12 is a narrow portion 21 having an equal width, and the rear portion of the side rail 12 has an inclined portion 22 on the inner side thereof, so that the side rail 1 is formed.
The rear portion 2 is formed in a divergent shape, and the end of the inclined portion 22 reaches the rear end portion of the slider body 10 continuously with the outflow portion 23 parallel to the side surface of the slider body 10. Further, the side rail 1 is provided on the slider body 10 near the rear end side surface.
A notch portion 24 is formed by obliquely notching the rear end portion of 2.

Further, the inclination angle θ of the inclined portion 22 of the side rail 12 (the inclined portion 22 with respect to the side surface of the slider body 10)
(Indicated as an angle between a line e parallel to the side surface of the slider body 10 in FIG. 1) is in the range of 33 to 37 °. This inclination angle θ is such that the side rail 12 serves as a positive pressure generating portion. Therefore, when the inclination angle θ is reduced, the area of the side rail 12 is reduced, the positive pressure generating force is reduced, and the levitation force of the slider body 10 is reduced. And conversely, the tilt angle θ
Since the positive pressure generation force increases and the levitation force increases with increasing, the setting was made in consideration of the fact that the levitation amount does not fluctuate due to the altitude difference of the installation location. When the tilt angle is less than 33 °, the flying height of the slider body 10 starts to be greatly affected, and when it exceeds 37 °, the flying height is little affected.
Therefore, the reliability of the slider body 10 during traveling decreases.

Next, the structure of the magnetic core 11 formed in the center of the rear end of the slider body 10 will be described. The magnetic core 11 shown in this example is a composite magnetic head core whose sectional structure is shown in FIGS.
An MR head (reading head) h1 and an inductive head (writing head) on the rear end surface (trailing end surface)
and h2 are laminated in this order.

The MR head h1 detects a leakage magnetic flux from a recording medium such as a disk by utilizing a magnetoresistive effect and reads a magnetic signal. As shown in FIGS. 3 and 4, the MR head h1 has a structure in which the alumina (Al _{2 is formed} on the lower shield layer 33 made of a magnetic alloy such as sendust (Fe—Al—Si) formed at the rear end of the slider body 10. A lower gap layer 34 made of a nonmagnetic material such as O ₃ ) is provided, and a magnetoresistive effect material film 35 is laminated on the lower gap layer 34. On both sides of the giant magnetoresistive effect material film 35, a hard bias layer for applying a bias magnetic field to the film, an electrode layer for applying a detection current, and the like are formed, and an upper gap layer is formed on the hard bias layer and the electrode layer. An upper shield layer is formed on the upper surface of the inductive head h2.
It is also used as the lower core layer 45.

In the inductive head h2, the gap layer 44 is formed on the lower core layer 45, and the coil layer 46 patterned so as to have a planar spiral shape is formed on the gap layer 44.
And the coil layer 46 is surrounded by the insulating material layer 47. Upper core layer 48 formed on insulating material layer 47
Is provided such that its tip end 48a faces the lower core layer 45 with a minute gap at the ABS surface 31b, and its base end 48b is magnetically connected to the lower core layer 45. A protective layer 49 made of alumina or the like is provided on the upper core layer 48.

In the inductive head h2, a recording current is applied to the coil layer 46, and a recording magnetic field is applied from the coil layer 46 to the core layer. Then, a magnetic signal can be recorded on a magnetic recording medium such as a magnetic disk by a leakage magnetic field from the tips of the lower core layer 45 and the upper core layer 48 at the magnetic gap G. Further, in the MR head h1, the electric resistance of the magnetoresistive effect material film 35 changes depending on the presence / absence of a minute leakage magnetic field from the magnetic disk.
By reading this resistance change, the recorded contents of the magnetic disk can be read.

In the magnetic head slider 10 constructed as described above, the magnetic head 1 floats on the magnetic disk 1 by CSS as in the conventional magnetic head 2 shown in FIG. Write and read. Therefore, when the magnetic disk 1 is stopped, the magnetic head slider S is stopped while the bottom surface of the side rail 12 is lightly pressed against the surface of the magnetic disk 1 by the urging force of the spring plate 3.

When the magnetic disk 1 starts to rotate from this state, an air flow is generated on the surface of the magnetic disk, and this air flow flows into the bottom surface side of the slider body 10 via the inclined surfaces 13 of the slider body 10. . Here, since the lift force is generated on the inclined surfaces 13 and 13 due to the generation of the air flow, when the lift force has a magnitude overcoming the biasing force of the spring plate 3, the slider body 10 starts to fly. Also, the inclined surfaces 13, 1
The air that has passed through 3 and has flowed into the bottom surface of the slider body 10 and the air that has passed between the inclined surfaces 13 and 13 has the preliminary negative pressure groove 1
5, a large negative pressure is generated here, so that the slider body 10 tilts at a predetermined pitch angle α with the tilted surface 13 side lifted up like the magnetic head 2 shown in FIG.

A part of the air that has passed through the inclined surfaces 13 and 13 flows along the side rails 12 to generate positive pressure, but passes through the inclined surfaces 13 and 13 and flows into the main negative pressure groove 16. The air also generates a negative pressure in the main negative pressure groove 16. Here, if negative pressure is generated at the three triangular positions of the preliminary negative pressure groove 15 and the preliminary negative pressure portions 16 and 16 located on both sides of the front negative groove, the negative pressure is applied to the slider body 10 at the three triangular positions. At the position, the force for attracting the slider body 10 to the magnetic disk 1 side is generated at the triangular position, so that the slider body 10 can be attracted to the magnetic disk 1 side with a well-balanced attraction force. Therefore, the flying stability of the slider body 10 can be improved.

Next, although the area of the positive pressure generating portion including the side rails 12 may be reduced by forming the main negative pressure groove 16, in the slider body 10 of this example,
The rear end side of the side rail 12 is formed in a divergent shape to prevent the area of the positive pressure generating portion from decreasing. Such area adjustment of the positive pressure generating portion can be performed by setting the inclination angle θ of the inclined portion 22 within an appropriate range. In this example, θ is 33 to 3
By setting the angle to 7 °, the floating stability can be secured.

Next, notches 24 are formed on both sides of the rear end of the slider body 10, and these notches 24, 24 are formed.
Prevents the end of the slider body 10 on the side closer to the magnetic disk 1 from coming into contact with the magnetic disk 1 when the roll angle of the slider body 10 becomes large for some reason. Further, when the slider main body 1 completes the floating traveling, the flying height is sufficiently secured, so the probability that the rear end of the slider main body 10 will contact the magnetic disk 1 by the roll ring is low, but in CSS the slider main body is Since the flying height is small at the time when 10 starts to fly, if large rolling occurs at this time, there is a risk that the trailing edges of the slider body 10 will contact the magnetic disk 1, but these notches 24, 24 By providing it, this problem can be solved.

Next, in the example shown in FIGS. 1 and 2,
Although the areas of the main negative pressure grooves 16 on both sides of the introduction groove 14 are the same, the areas of the main negative pressure grooves 16 do not have to be the same on the left and right as described above. For example, by changing the areas of the left and right main negative pressure grooves 16, the negative pressure generated on the left and right of the introduction groove 14 can be changed, so that the outer peripheral side of the magnetic disk is affected by the skew angle of the slider body 10. When an excessive levitation force is generated on the side rails 12 located at, and the roll angle of the slider body 1 is increased, the main negative pressure groove 16 on the outer peripheral side of the magnetic disk is formed smaller than the main negative pressure groove 16 on the opposite side. This makes it possible to obtain roll angles in the same range on the inner circumference side and the outer circumference side of the magnetic disk.

[0028]

EXAMPLE A rectangular slider body having the shape shown in FIGS. 1 and 2 has a long side length of 2.043 mm, an inclined surface length of X mm, a width of 0.675 mm, and an introduction groove width of 0. 15mm,
Length 0.8mm, minimum width of side rail 0.215mm,
The width of the step is 0.05 mm, the distance from the start of the inclined part to the rear end of the slider body is 0.78 mm, and the part of the rear end of the slider body, which is 0.08 mm x 0.15 mm, is cut out. And the notch is formed, the inclination angle θ of the inclined portion is set to 26 to 46 °, and the depth of the main negative pressure groove and the auxiliary negative pressure groove is set to 4 μm from the surface of the side rail.
A slider body made of a composite ceramic of l ₂ O ₃ and TiC was produced.

In the slider main body of this structure, the length of the inclined surface of the side rail (length along the length direction of the slider main body) X and the inclination angle θ were changed to various values to produce an altitude of 3000 m ( It was installed in a test room corresponding to an atmospheric pressure of 10,000 feet) and a running test was carried out when the magnetic disk was levitated. In this test, the value of the flying height reduction amount of the sample in which the value of the tilt angle θ was fixed to 33.5 ° and the ratio of the length of the tilt surface to the length of the slider body was changed was measured. Shown in inches [μ "] and nanometer (nm) unit, the value of X is fixed to 0.2 mm, and the flying height measurement result of the sample in which the tilt angle θ is changed is shown in FIG. 6 in nanometer (nm) unit. In addition, in FIG.
The inclination angle θ was taken as a parameter on the horizontal axis.
Since the length d of the outflow portion at the rear part of the slider body can also be used as a parameter that can be considered in the same manner as above, the corresponding length of the outflow portion is also shown as d (mm) on the horizontal axis.

From the results shown in FIG.
It has been found that the value of (length of inclined surface) / (length of slider body) needs to be 0.13 or less in order to reduce the size to 38 micro inches or less. This amount of decrease in ascent-0.3
8 microinches is the currently commonly used 2
In a magnetic head slider having two side rails, a negative pressure groove is not provided, and a step portion is provided at a side edge of two side rails. is there. Therefore, in the magnetic head having the configuration of this example, by setting the value of (the length of the inclined surface) / (the length of the slider body) to 0.13 or less, compared with the conventional general magnetic head slider. It is clear that the amount of reduction in flying height can be made comparable to the above.

Next, considering the results shown in FIG. 6, there is a demand for minimizing the side rail area and increasing the flying height in view of the general CSS of the magnetic head. Obviously, it is preferable to set the flying height to 33 ° or more, where the flying height is sharply reduced. Even if the inclination angle θ is increased to 33 ° or more and the area of the side rail is increased, the flying height is hardly improved as shown in FIG.
In order to suppress the rate of increase in the area of the side rails to about 1%, it is preferable to set the inclination angle θ to about 37 ° or less. If the area of the side rail is unnecessarily increased, the bottom surface of the side rail is more likely to be attracted to the magnetic disk when the magnetic head slider is stopped.

[0032]

As described above, according to the present invention, the inclined surfaces are formed at the front end portions of the side rails on both side edges of the slider body, and the introduction groove is formed between the front portions of both side rails. ,
A preliminary negative pressure groove, which is wider than the introduction groove and communicates with the introduction groove, is formed between both side rails, the rear side of the preliminary negative pressure groove is formed in a rearward constricted shape, and the both sides of the introduction groove are formed. A main negative pressure groove communicating with the preliminary negative pressure groove is formed, while a rear end side of the side rail is formed in a divergent shape, and the side rail serves as a positive pressure generating portion and the main negative pressure groove and the main negative pressure groove. Since the negative pressure groove is used as the negative pressure generating portion, the slider main body can be levitated while maintaining balance between the positive pressure generated by the positive pressure generating portion and the negative pressure generated by the negative pressure generating portion. Therefore, when the peripheral speed of the magnetic disk is different on the inner or outer circumference side of the magnetic disk and the amount of air flowing into the bottom side of the slider body is slightly different, or the skew angles are different, the left and right side rails are different. It is possible to provide a magnetic head slider capable of stabilizing the flying height of the slider body and stabilizing the flying traveling state even when the positive pressures generated differ.

In the above structure, by setting the inner inclination angle in the divergent portion of the rear end of the side rail to 33 to 37 °, the area of the side rail as the positive pressure generating portion can be adjusted to an appropriate value, and the altitude can be adjusted. Even when installing in a place where there is a large difference, an appropriate flying height can be secured and a stable running state can be obtained. Further, by forming the notch on the side surface of the rear end of the side rail, even if the rolling angle of the slider main body becomes large and the side of the rear end of the slider main body approaches the magnetic disk surface,
The slider body is less likely to come into contact with the magnetic disk.

[Brief description of drawings]

FIG. 1 is a bottom view of an example of a magnetic head slider according to the present invention.

FIG. 2 is a perspective view showing the shape of the bottom surface side of an example of a magnetic head slider according to the present invention.

FIG. 3 is a sectional view showing an example of a magnetic core portion provided in a magnetic head slider according to the present invention.

FIG. 4 is a partial cross-sectional view showing an example of a magnetic core portion provided in the magnetic head slider according to the present invention.

FIG. 5 is a diagram showing the measurement result of the flying height decrease amount with the length of the inclined surface of the slider body, which is measured at a high altitude of about 3000 m using an example of the magnetic head slider according to the present invention.

FIG. 6 is a diagram showing a relationship between a tilt angle of a tilted portion and a flying height reduction amount measured at a high altitude of about 3000 m using an embodiment of a magnetic head slider according to the present invention.

FIG. 7 is a diagram showing an arrangement relationship between a general magnetic head and a magnetic disk.

FIG. 8 is a side view showing a flying state of an example of a conventional magnetic head.

FIG. 9 is a rear view showing a flying traveling state of an example of a conventional magnetic head.

[Explanation of symbols]

 S magnetic head slider 10 slider body 11 magnetic core 12 side rail 13 inclined surface 14 introduction groove 15 preliminary negative pressure groove 16 main negative pressure groove 22 inclined portion

Claims (4)

[Claims] 1. A magnetic head slider in which a magnetic head core is provided in a plate-shaped slider body and floats and runs on a magnetic disk to write or read magnetic information, the medium being on the side of the magnetic disk of the slider body. Side rails that extend from the front side to the rear side of the slider body are formed on both edge sides of the facing surface, and an inclined surface is formed at the front end of each side rail. An introduction groove is formed on the side rail, and a preliminary negative pressure groove is formed between the central portion and the rear side of both side rails and communicates with the introduction groove and is wider than the introduction groove. Is formed on the slider body and reaches the rear end of the slider body, and extends on both sides of the communication portion between the introduction groove and the preliminary negative pressure groove from the vicinity of the communication portion toward the front end side of the side rail to the preliminary negative pressure groove. Communicating While the main negative pressure groove is formed side by side with the introduction groove, the rear end side of the side rail is formed in a divergent shape, and the side rail is a positive pressure generating portion and the auxiliary negative pressure groove and the main negative pressure groove. A magnetic head slider comprising a negative pressure groove as a negative pressure generating portion. 2. The magnetic head slider according to claim 1, wherein an inner inclination angle of the flared end portion of the rear end of the side rail is 33 to 37 °. 3. The magnetic head slider according to claim 1, wherein a notch is formed on the side surface side of the rear end of the side rail. 4. The magnetic head slider according to claim 1, wherein the front end side of the main negative pressure groove located on the front side of the slider body is formed in a tapered shape.