JPH1049822A - Manufacture of magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the recording density without lowering reliability by providing a terminal sagging part in the lowest end part of a magnetic head near the magnetic disc at the time when the magnetic head is in a posture for wiring or reading information while it is inclined to the magnetic disc. SOLUTION: The terminal sagging part 10 is generated at the end part of the floating surface 9 of a magnetic head 1 by polishing the tape of using soft surface. Next, the floating surface 9 is polished by a processing method resulting in generate of a small amount of terminal agging to eliminate the polishing margin 11 for adjusting sagging width. When a shape curve 12 obtained at the terminal sagging part 10 is expressed as y=f(x) at the cross-section of the magnetic head 4 passing a head element 5 which is cut at the plane parallel to the relative movement direction for the magnetic disc and is vertical to the surface of the magnetic disc, it can be expressed approximately by any one of the formula 1 or 2. Here, A, B and C are constant. Therefore, the terminal sagging part 10 can easily be generated in a large number and an impact generated during contact with the magnetic disc becomes small and thereby a trouble is not easily generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flying or contact type magnetic head for a magnetic disk drive.

[0002]

2. Description of the Related Art As shown in FIG. 1, for example, a magnetic disk device, which is a kind of external storage device, uses a magnetic head (slider) 1 supported by a gimbal 2 to transfer information to a rotating disk-shaped magnetic disk 3. The writing / reading of data is performed magnetically. The magnetic head 1 is usually made of ceramic, and has an element for recording a magnetic signal and an element for reproducing the magnetic signal at its end.

In a magnetic disk drive, a magnetic disk 3
And the magnetic head 1 are relatively moving at a speed of several tens m / s or more and tilted at a certain tilt angle 7. At this time, the magnetic disk 1 floating with the magnetic head 1 receiving the dynamic pressure of the gas is called a floating type (see FIG. 2), and the magnetic head 3 that slides in contact with the magnetic disk 3 is called a contact type (see FIG. 3). .

In the case of the floating type, as shown in FIG. 2, the recording density can be improved by reducing the floating amount 6. Here, the flying height 6 is defined as an average distance between the lowermost end of the magnetic head 1 and the magnetic disk 3. But,
If the flying height 6 is inadvertently reduced, the number of collisions between the magnetic head 1 and the magnetic disk 3 increases due to factors such as dust and vibration, and an element for detecting or reproducing a magnetic signal may be damaged, or magnetized information may be lost. Or lost. Further, when the magnetic head 1 and the magnetic disk 3 come into contact with each other, the temperature of the reproducing element rises, noise is generated in the reproduced signal, and the reliability of information is lost.

In order to avoid such obstacles and to increase the recording density, the magnetic head element 5 must be
Needs to be close to the lowermost part when viewed from the whole. A method of manufacturing a magnetic head in consideration of this point is disclosed in, for example, JP-A-63-96722 and JP-A-Hei.
Japanese Patent Application Laid-Open No. 92922/92 and Japanese Patent Application Laid-Open No. 7-57219.

[0006]

However, Japanese Patent Application Laid-Open No.
In the prior art disclosed in Japanese Patent Application Laid-Open No. 96722, only a normal machining method is shown as a means for realizing this, and according to this method, it is not possible to mass-produce a magnetic head having an appropriate shape industrially. Have difficulty.

Further, in the prior arts of Japanese Patent Application Laid-Open Nos. 1-92922 and 7-57219, a method in which a magnetic head is levitated and processed by burnishing is disclosed. However, in recent years, a magnetoresistive reproducing element used as a magnetic head element may be destroyed due to a high temperature near an element which is a processing point or a problem of generation of static electricity.

Further, in these prior arts, since the chamfering is performed using the flying attitude, it is very difficult to change the inclination angle 7 and the shape with respect to the magnetic disk 3. Further, in these prior arts, since only one slider 1 can be fixed to the gimbal 2 and processed one by one, the throughput is small, and it is difficult to form the final protective film on the air bearing surface, which is a bottleneck.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems, and has as its object to provide a magnetic head and a method of manufacturing the same which can improve the recording density without lowering the reliability. To provide. Another object of the present invention is to provide a magnetic head of a contact type that can reduce the possibility of damaging a magnetic disk during sliding, and a method of manufacturing the same.

More specifically, an object of the present invention is to provide a magnetic head having a lower end or a lower end with respect to the lowermost end of the magnetic head in an operating state without damaging the element. It is an object of the present invention to provide a magnetic head and a method of manufacturing the same, which have a shape of a lowermost end portion that does not hinder the magnetic disk while bringing a portion immediately below the magnetic head closer.

[0011]

In order to achieve the above object, the present invention relates to a method of manufacturing a magnetic head, wherein a magnetic head (slider) for a magnetic disk drive floats or contacts a magnetic disk while being inclined with respect to the magnetic disk. When reading and writing information, remove the lowermost part of the magnetic head, which is closer to the magnetic disk than the magnetic information read element or write element, on the surface of the magnetic head facing the magnetic disk. By doing so, an end sag portion is formed.

Various shapes for reducing the distance between the lower end portion of the head element portion and the magnetic disk obtained by removing the lowermost end portion of the magnetic head in a floating position are conceivable, for example, as shown in FIG. As described above, in the cross section of the magnetic head 4 passing through the head element section, which is cut in a plane parallel to the direction of relative movement with respect to the magnetic disk and perpendicular to the surface of the magnetic disk, the shape curve 12 obtained for the end sag portion is obtained. y =
If represented by f (x), at least a part thereof is configured to be approximately expressed by one of the following two equations.

Y = f (x) = A + B · EXP (−C · x) (Equation 1) y = f (x) = A + B · EXP (−C · x ² ) (Equation 2) Here, A, B, and C are constants. Note that this shape curve 1
Reference numeral 2 denotes a shape of a sag portion before a portion 11 described later is removed. According to such a shape, it is easy to mass-produce the above-mentioned edge sagging portion, which is a characteristic configuration of the present invention, and when it comes into contact with a magnetic disk, the impact is small geometrically and trouble occurs. The effect of being difficult is obtained.

Further, in the present invention, in order to obtain the above-mentioned shape, for example, tape polishing and chamfering may be performed by lapping with free abrasive grains and a metal platen, or the magnetic head may be slightly swung. Is used to carry out mechanical polishing while holding the wafer. Here, when performing the mechanical polishing, the magnetic head is held by the elastic body, or the mechanical polishing is performed while applying a polishing pressure to the magnetic head with a fluid. Further, the edge sagging portion may be polished using a polishing platen or a fixed abrasive grindstone having a Young's modulus of 10 GPa or less, or a curved surface of the portion may be polished using a heterogeneous material having a Young's modulus difference of 1 GPa or more. The polishing may be performed by using a polishing platen or a fixed abrasive grindstone in which the material is laminated a plurality of times. In the latter polishing method, the thickness of the polishing platen or the upper layer of the fixed abrasive grindstone is, for example, 10 μm or less.

By the way, in the method of creating the end sagging portion using the sagging as described above, a variation in shape is likely to occur during mass production. Therefore, in the present invention, a large sag is first formed, and then the surface facing the magnetic disk is mechanically polished with a small amount of end sag, thereby providing a sag width adjustment sag 11.
(See FIG. 4) to finally obtain the target shape.

When a large end sag is formed, a dent (called a processing step) may occur in the element portion of the magnetic head. In order to reduce the processing step, it is desirable that the surface facing the magnetic disk is mechanically polished again flat. Further, since the processing method for creating the end sag 10 tends to increase the processing step, it is effective to form the end sag region on the surface facing the magnetic disk so that the lower end of the head element portion is not included. .

According to such a process, the boundary between the curved surface portion due to the sag and the surface facing the magnetic disk becomes clear. Further, when the magnetic head comes into contact with the magnetic disk, the contact portion is slightly displaced from the element portion, so that damage to the element is reduced and thermal noise is hardly picked up.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a magnetic head and a method of manufacturing the same according to the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

As shown in FIG. 4, the magnetic head 4 according to the present embodiment has an end sag portion 10 approximated by a shape curve 12 defined by either of the above equations (1) and (2).
It has a structure provided at least on the side of the air bearing surface 9 where the head element portion 5 is arranged.

In the method of manufacturing the magnetic head according to the present embodiment, for example, a magnetic head having a conventional structure as shown in FIGS. The processing method is composed of two steps: a step of forming an end sag portion and a step of adjusting the width of the end sag portion.

(1) As an example of the step of creating the edge sagging portion, an example using a processing method by tape polishing will be described.

In this step, as shown in FIG. 5, the elastic body 14 having a spring constant k = 1 to 4 kPa / m has a base thickness 25 μm.
, a polishing tape 16 having diamond abrasive grains of 0.25 μm is adhered, an average moving speed is 1 m / min, and a polishing pressure is 2.8 M.
With Pa, the plurality of floating magnetic heads 15 fixed to the jig 13 are dry-ground. By this method, the end of the floating surface (the surface facing the magnetic disk) of each magnetic head 15 is chamfered to create an end sagging portion.

Here, the shape y of the end sag portion changes according to the following equation.

(1 / C) · (∂y / ∂t) = TΔy−ky (Equation 3) where, y: shape T: polishing tape tension t: processing time k: elastic body spring constant C: Polishing constant Δ: Laplacian. Solving Equation 3, the shape y is approximately represented by the function of Equation 2. Since the sagging shape changes with the machining time, the machining is immediately stopped when the required shape is obtained. Although the function form of the shape curve may be different depending on the actual processing conditions, the desired shape can be obtained by adjusting the processing conditions and method.

(2) As an example of the step of adjusting the edge sag width,
An example using a polishing method using fixed abrasive grains will be described.

In this step, in order to reduce the required amount of edge sag created by the above-described process, polishing is performed with a small amount of edge sag, and the portion 11 in FIG. 4 is removed.

More specifically, the surface of the polishing platen is provided with a correction device capable of spirally forming a groove of 1 to 50 μm with a diamond tool on a polishing machine, and is supported by an air bearing having high shaft rigidity. Use a wrap device with a rotating part.
It is desired that the mass of the rotating portion be 1.5 to 4 times the mass of the polishing platen and the polishing jig.

It is desirable that the eccentricity of the outer periphery of the polishing platen when the polishing platen is attached is 0.1 to 10 μm. Further, the polishing platen to be used is fixed to a firm base, and tin or 0.1
It is assumed that it is made of an alloy composed of about 40% of different metals. Pb, In, Cu, F
e, Ag, Sb, Zn, Bi and the like. The radius is 3 to 20 mm on the inner and outer sides when the correction ring is placed on the surface plate.
The size that it protrudes is good.

For the formation of the groove, it is necessary to have a flatness of 1 μm to 10 μm in a region in contact with the repair ring. Tip R is 0.05 ~
It is preferable that the tip angle is 2 mm and the tip angle is about 30 to 75 degrees.

The surface plate may be corrected by removing unnecessary burrs and irregularities sufficiently with a correction device, and then cutting the diamond plate with a diamond tool of about 1 μm to 50 μm. further,
Using a ceramic correction ring, the polishing plate is rotated on the polishing plate while dropping the polishing liquid until the polishing plate has sufficient flatness. At this time, it is assumed that the correction ring has a mechanism capable of forcibly applying a rotational movement. It is necessary to sufficiently stabilize the rotation ratio between the platen and the correction ring. As the polishing liquid, a diamond slurry containing a surfactant and having an average abrasive particle diameter of 1/10 to 1/2 μm is used. Confirm that the flatness of the polishing platen is sufficiently formed, and remove abrasive grains from the polishing platen and the correction ring.
Wash.

Further, as shown in FIG. 6, one or more magnetic heads are arranged on the support jig 20, or a plurality of magnetic heads are fixed. This was placed on a polishing platen 18 on which the abrasive grains were fixed, together with a correction ring 19, and
Polishing is performed while rotating at about 30 rpm and dropping a lubricant 17 containing a highly viscous surfactant. At this time, the polishing efficiency of the surface plate is checked in advance, and the target shape is obtained by polishing about 50 to 200 nm.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the present embodiment, an example will be described in which the processing method by grinding is used in the step of adjusting the edge sag width. In this example, as shown in FIG. 7, the magnetic head 22 fixed to the rotating shaft 23 is processed while using a fine abrasive whetstone 21 having a particle size of 6000 to 20,000 having uniform cutting edges and spraying a grinding fluid with a coolant 24. The desired shape is obtained by precision grinding with an amount of about 50 to 200 nm.

According to the present embodiment, the sag width of the end sag portion can be adjusted with high accuracy.

Next, a third embodiment of the present invention will be described with reference to FIG.

In this embodiment, in the step of forming the edge sagging portion, a processing method using free abrasive grains and a metal platen is used. That is, in order to create an edge sag, as shown in FIG. 8, while dropping a surfactant in which diamond abrasive grains 25 of 0.25 μm are dispersed on a tin platen 26,
Magnetic head 4 with a polishing pressure of 4000 Pa added
50m only in the direction perpendicular to the required edge of the sag
Polishing is performed with a relative motion of / min. At this time,
Since the diamond abrasive grains 25 are polished while being embedded in the tin platen 26 by the end of the magnetic head 4, the processing amount changes according to the distance from the end.

According to the present embodiment, the plastic deformation of tin on the surface of the tin platen 26 can be expressed as
Alternatively, it is possible to obtain a cross-sectional shape in which at least a part thereof is approximately represented.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

This embodiment is a processing method using a soft polishing platen. In the present embodiment, as shown in FIG.
Young's ratio of 0.7 μm dispersed diamond abrasive grains is 0.7
A fixed abrasive grindstone 27 of about GPa is created. This polishing platen is made of a metal powder such as tin and a synthetic resin such as polyvinyl alcohol, phenol resin, polyimide, etc., of 25 to 35.
% By mixing and baking and solidifying it. On this surface plate, the magnetic head 4 to which a polishing pressure of 4000 Pa has been applied while dropping a lubricant is polished while performing a relative movement of 50 m / min only in a direction perpendicular to a required end of the sag.

According to the method of this embodiment, the abrasive grains are
Since the magnetic head 4 moves up and down due to the elasticity of the magnetic head 7, sagging can be created at the end of the magnetic head 4.

In this embodiment, the Young rate is 0.7
Although the example using the fixed abrasive grindstone 27 of about GPa was shown,
In general, the same effect as in the present embodiment can be obtained by using a polishing platen having a Young's modulus of 10 GPa or less or a fixed abrasive wheel.

Next, a fifth embodiment of the present invention will be described with reference to FIG.

In this embodiment, a processing method using a multilayer polishing platen is used. In this embodiment, as shown in FIG. 10, a normal metal platen 29 is first flattened, and a liquid synthetic resin is applied thereon by spin coating to form a film 2 having a thickness of about 1 μm.
8 is formed. This is flattened by cutting, and abrasive grains having an average particle size of 0.5 μm are embedded using a correction ring. By performing processing using this, the shape of the surface plate is deformed by the polishing pressure, and an end sag can be created in the magnetic head 4.

According to the present embodiment, the sag shape formed on the magnetic head 4 can be changed by controlling the thickness of the laminated film 28. Specifically, the laminated film 28
By increasing the thickness, the sag width increases, and the radius of curvature of the sag shape curve increases.

In this embodiment, the platen on which the laminated film in which the abrasive grains are embedded is described. However, in the present invention, if the following conditions are satisfied, the abrasive is not necessarily included in the laminated film. There is no need to be embedded. That is, in the present invention, Yo on the normal surface plate is 1 GPa or more.
It is desirable to use a surface plate or a fixed abrasive wheel constructed by laminating a plurality of different materials having different ung rates a plurality of times. With this configuration, the same effect as in the present embodiment can be obtained. Here, the thickness of the uppermost layer of the laminated film is desirably 10 μm or less.

Next, a sixth embodiment of the present invention will be described with reference to FIG.

This embodiment is a processing method using a polishing platen which holds a body to be polished with an elastic body. In the present embodiment, FIG.
As shown in (1), when the magnetic head 4 which is the object to be polished is held by the holding jig 13 by mechanical polishing using the ordinary metal platen 30, the polishing is performed while holding the magnetic head 4 via the synthetic rubber 14.

According to the present embodiment, the polishing force acting in the normal direction of the surface plate and the resultant force of the polishing resistance acting in the moving tangential direction,
The synthetic rubber 14 which is an elastic body is deformed, and sag occurs at the end of the magnetic head 4. Thereby, for example, a magnetic head having a shape as shown in FIG. 4 can be manufactured.

In this embodiment, an example using the synthetic rubber 14 has been described. However, the present invention is not limited to this, and a member made of another elastic body may be used.

Next, a seventh embodiment of the present invention will be described with reference to FIG.

In the present embodiment, a polishing platen for holding a body to be polished by a fluid is used. In the present embodiment, as shown in FIG. 12, mechanical polishing using a normal metal platen 30,
The magnetic head 4 to be polished is held by the template 32 so as not to be laterally displaced, and polishing is performed in a state where a polishing pressure is applied to the magnetic head 4 by air passing through the air passage 31 provided in the template 32. . The air pressure here is a gauge pressure of 0.1 to 0.5MP
Add about a.

According to the present embodiment, when the polishing direction at the time of polishing changes, the magnetic head 4, which is the object to be polished, slightly moves, and end sagging occurs. Thereby, for example, a desired shape as shown in FIG. 4 can be obtained.

Although air is used to apply a polishing pressure to the magnetic head 4 in this embodiment, other types of gases and fluids may be used if polishing conditions permit.

As described above, according to the magnetic head manufactured according to each of the embodiments of the present invention, the distance between the head element unit serving as the signal detecting unit of the magnetic head and the magnetic disk serving as the recording medium can be reduced. Thus, the recording density can be improved. Further, in the magnetic head according to the present invention, since the portion close to the magnetic disk has a sag shape, damage to the magnetic disk and the magnetic head when the magnetic head accidentally contacts the magnetic disk is suppressed. In addition, it is possible to reduce the noise at the time of contact in the reproduction signal. In addition, adhesion between the magnetic head and the magnetic disk hardly occurs.

[0055]

According to the present invention, it is possible to provide a magnetic head capable of improving the recording density without lowering the reliability and a method of manufacturing the same. Further, according to the present invention, it is possible to provide a magnetic head of a contact type that can reduce the possibility of damaging the magnetic disk during sliding, and a method of manufacturing the same.

Further, according to the present invention, the lower end portion of the element or a portion immediately below the lower end portion of the magnetic head in a state where the magnetic head operates without damaging the element portion of the magnetic head. And a method of manufacturing the same, which has a shape of the lowermost end portion that does not impede the magnetic disk.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of a magnetic disk drive to which the present invention is applied.

FIG. 2 is an explanatory diagram showing a flying attitude during operation of a flying magnetic head.

FIG. 3 is an explanatory view showing a posture of the contact type magnetic head during operation.

FIG. 4 is an explanatory diagram showing a cross-sectional shape of a magnetic head according to the present invention.

FIG. 5 is an explanatory view showing a processing method by tape polishing in the first embodiment.

FIG. 6 is a perspective view showing a polishing method using fixed abrasive grains in the first embodiment.

FIG. 7 is an explanatory view showing a processing method by grinding in the second embodiment.

FIG. 8 is an explanatory view showing a processing method using free abrasive grains and a metal surface plate in the third embodiment.

FIG. 9 is an explanatory diagram showing a processing method using a soft polishing surface plate in the fourth embodiment.

FIG. 10 is an explanatory view showing a processing method using a multilayer polishing surface plate according to a fifth embodiment.

FIG. 11 is an explanatory view showing a processing method using a polishing platen used for an elastic body according to a sixth embodiment.

FIG. 12 is an explanatory view showing a processing method using a polishing platen with a fluid in a seventh embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 magnetic head (slider) (lower side: floating surface) 2 gimbal 3 magnetic disk 4 magnetic head (cross section) 5 magnetic head element part 6 floating amount 7 inclined surface 8 magnetic disk (cross section) 9 floating surface 10 edge sag 11 sagging width Polishing allowance for adjustment 12 Approximate curve of cross-sectional shape 13 Holding jig 14 Elastic body 15 Arrangement of magnetic heads 16 Polishing tape 17 Lubricating liquid not containing abrasive particles 18 Fixed abrasive platen plate 19 Correction ring 20 Fixed magnetic head Polishing jig 21 Grinding stone 22 Magnetic head 23 Rotating shaft 24 Coolant 25 Embedded abrasive 26 Metal polishing platen 27 Soft platen 28, 29 Polishing platen made of materials having different Young's modulus 30 Polishing platen 31 Air passage 32 Template.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiharu Waki 2880 Kozu, Odawara-shi, Kanagawa Storage System Division, Hitachi, Ltd.

Claims (18)

[Claims] 1. A method of manufacturing a magnetic head for reading or writing information on a magnetic disk, wherein at least the magnetic head is tilted with respect to the magnetic disk when reading or writing information. A method for manufacturing a magnetic head, comprising at least a step of creating an end sag portion for removing a corner of one side closest to a disk. 2. A method of manufacturing a magnetic head having a head element portion having at least one of a read element and a write element for reading and writing information on a magnetic disk, wherein the magnetic head is tilted with respect to the magnetic disk. When the magnetic head is in a posture of reading and writing information by floating or contacting, the surface of the magnetic head facing the magnetic disk is closer to the magnetic disk than the head element portion and corresponds to the lowermost end of the magnetic head. A method of manufacturing a magnetic head, comprising at least a step of forming an end sag portion so that a portion to be removed is removed. 3. The step of controlling the width of the edge sagging portion according to claim 2, wherein, after the step of forming the edge sagging portion, the surface of the magnetic head facing the magnetic disk is polished again flat to control the width of the edge sagging portion. A method for manufacturing a magnetic head, further comprising: 4. The method of manufacturing a magnetic head according to claim 2, wherein a portion of the end sag portion removed in the step of forming does not include a lower end of the head element portion. 5. The end sag portion according to claim 2, wherein the shape of the end sag portion passes through the head element portion by a surface parallel to a direction of relative movement with the magnetic disk and perpendicular to a rotation surface of the magnetic disk. On the cross section of the magnetic head cut as described above, y = f (x) = A + B · EXP (−C · x) at least approximately using constants A, B, and C. A method of manufacturing a magnetic head. 6. The head element portion according to claim 2, wherein a shape of the end drooping portion passes through the head element portion by a surface parallel to a direction of relative movement with the magnetic disk and perpendicular to a rotation surface of the magnetic disk. At least approximately using the constants A, B, and C on the section of the magnetic head cut as described above, y = f (x) = A + B.EXP (-C.x ² ). A method for manufacturing a magnetic head. 7. The method for manufacturing a magnetic head according to claim 1, wherein the step of forming the end sag portion is performed by tape polishing. 8. The method of manufacturing a magnetic head according to claim 3, wherein the step of controlling the width of the edge sag is performed by lapping with loose abrasive grains and a metal platen. 9. The method according to claim 1, wherein the step of forming the end sag portion is performed in a state in which the magnetic head is used as an object to be polished and the object to be polished is held so as to be able to swing slightly. A method for manufacturing a magnetic head, which is performed by mechanical polishing. 10. The method of manufacturing a magnetic head according to claim 9, wherein the magnetic head is held via an elastic body during the mechanical polishing. 11. The method for manufacturing a magnetic head according to claim 9, wherein a polishing pressure is applied to the magnetic head by a pressure of a fluid during the mechanical polishing. 12. The method according to claim 1, wherein the step of forming the edge sag portion is performed at a Young's modulus of 10 GPa.
A method for producing a magnetic head, wherein the polishing is performed by using one of a polishing platen and a fixed abrasive wheel described below. 13. The method according to claim 1, wherein the step of forming the edge sag portion comprises laminating a plurality of different materials having a Young's modulus difference of 1 GPa or more on the surface of a polishing platen or a fixed abrasive wheel. A method for manufacturing a magnetic head, wherein the method is polished by using the obtained material. 14. The method according to claim 13, wherein the thickness of the uppermost layer of the laminated film formed on the surface of the polishing platen or the fixed abrasive grindstone is 10 μm or less. 15. A magnetic head manufactured by the manufacturing method according to claim 1. 16. A magnetic head for reading or writing information on a magnetic disk, the magnetic head being closest to the magnetic disk when the magnetic head is inclined with respect to the magnetic disk to read and write information. A magnetic head comprising: an end sag portion in which one side corner is removed. 17. A magnetic head having a head element portion provided with at least one of a read element and a write element for reading and writing information on a magnetic disk, wherein the magnetic head floats or contacts while tilting with respect to the magnetic disk. When reading and writing information, the surface of the magnetic head facing the magnetic disk has a portion corresponding to the lowermost end of the magnetic head closer to the magnetic disk than the head element portion. A magnetic head comprising a removed end sag portion. 18. A magnetic head having a head element section for reading and writing information on a rotating disk-shaped magnetic disk, and reading and writing information by floating or contacting the magnetic head while inclining with respect to the magnetic disk. And a gimbal mechanism for holding the gimbal mechanism in a position where the magnetic head is manufactured. The magnetic head is manufactured by the manufacturing method according to any one of claims 1 to 14, wherein the gimbal mechanism includes a gimbal mechanism of the magnetic head. A magnetic disk drive characterized in that the end sag portion can be held so as to be located at the lowermost end of the entire magnetic head.