WO2002063614A1

WO2002063614A1 - Thin film magnetic head, magnetic head assembly, and composite thin film magnetic head

Info

Publication number: WO2002063614A1
Application number: PCT/JP2001/000785
Authority: WO
Inventors: Syuji Nishida; Ikuya Tagawa
Original assignee: Fujitsu Limited
Priority date: 2001-02-05
Filing date: 2001-02-05
Publication date: 2002-08-15

Abstract

A thin magnetic head wherein a lower pole layer (47) has a core width which decreases toward the front end facing the opposite surface (25) of a medium. The magnetic flux efficiently concentrates on the front end of the lower pole layer (47). The recording magnetic field increases. A radiating layer (49) is formed around the lower pole layer (47). The heat from a spiral coil pattern (53) is efficiently transmitted to the radiating layer (49). The radiating layer (49) can contribute to dissipation of heat from the spiral coil pattern (53) in addition to the lower pole layer (47). Even if the lower pole layer (47) is narrowed, an excessive rise in the temperature of the spiral coil pattern (53) can be avoided to the fullest extent.

Description

Specification

Thin film magnetic head and magnetic head assembly, composite thin film magnetic head

Technical field

The present invention relates to a thin-film magnetic head used in a magnetic recording medium drive such as a magnetic disk drive and a magnetic tape drive. Background art

Composite thin-film magnetic heads used in combination with read heads such as magnetoresistive (MR) elements are widely known. In such a composite thin film magnetic head, the lower magnetic pole layer generally also functions as a shield layer of the read head. Therefore, the lower pole layer must have a larger core width than the upper pole layer. In other words, the magnetic flux path is formed in the lower magnetic pole layer in a wider range than in the upper magnetic pole layer. It is not possible to sufficiently converge the magnetic flux at the tip facing the so-called medium facing surface. The magnetic flux flowing through the lower pole layer cannot make the maximum contribution to the formation of the recording magnetic field.

On the other hand, in order to increase the recording density of a magnetic recording medium, it is expected that a coil pattern incorporated in a thin-film magnetic head will be further miniaturized. When the coil pattern is miniaturized in this way, the heat generation of the coil pattern increases. It is desired that the heat of the coil panel be dissipated efficiently. Disclosure of the invention

The present invention has been made in view of the above circumstances, and has as its object to provide a composite thin-film magnetic head including a lower magnetic pole layer capable of efficiently concentrating magnetic flux at a tip facing a medium facing surface. . In addition, another object of the present invention is to provide a thin-film magnetic head capable of efficiently dissipating heat from a coil pattern.

To achieve the above object, according to the first aspect, a lower shield layer, an upper shield layer, and a magnetoresistive effect sandwiched between the lower shield layer and the upper shield layer and facing the medium facing surface are provided. An element, a nonmagnetic layer formed on a surface of the upper shield layer, A lower magnetic pole layer that extends along the surface of the non-magnetic layer while decreasing the core width toward the front end facing the medium facing surface, and a spiral coil pattern formed in the insulating layer at least partially on the lower magnetic pole layer A magnetic coupling is established between the lower magnetic pole layer at the center of the spiral coil pattern and the upper magnetic pole layer spreading along the surface of the insulating layer while narrowing the core width toward the tip facing the medium facing surface. A composite thin-film magnetic head characterized by comprising:

In such a thin film magnetic head, when a current is supplied to the conductive spiral coil pattern, a magnetic field is generated in the spiral coil pattern. The magnetic flux flows through the upper magnetic pole layer and the lower magnetic pole layer based on the generated magnetic field. At this time, in the upper magnetic pole layer and the lower magnetic pole layer, the path of the magnetic flux is narrowed as approaching the medium facing surface. As a result, the magnetic flux can be efficiently concentrated at the front ends of the upper magnetic pole layer and the lower magnetic pole layer. In particular, since the path of magnetic flux in the lower pole layer is narrowed to the utmost as compared with the conventional thin-film magnetic head, a magnetic field is generated efficiently at the front end of the upper pole layer and the lower pole layer. A maximally strong magnetic field can be established.

According to the second invention, the lower pole layer that extends along the surface of the base layer while reducing the core width toward the tip facing the medium facing surface, and the heat dissipation layer that extends around the lower pole layer along the surface of the base layer And a non-magnetic layer extending along the surface of the base layer around the heat radiation layer.

Generally, in a thin film magnetic head, a magnetic field is generated in a spiral coil pattern based on a supplied current. At this time, the spiral coil pattern generates heat based on the supplied current. Such heat is dissipated from the spiral coil pattern through the lower pole layer. If the heat radiation layer is arranged around the lower magnetic pole layer, the heat of the spiral coil pattern can be efficiently transmitted to the heat radiation layer even if the lower magnetic pole layer is narrowed. The heat dissipation layer can contribute to heat dissipation of the spiral coil pattern in addition to the lower pole layer. Heat dissipation from the spiral coil pattern can be facilitated. Excessive temperature rise of the spiral coil pattern can be avoided as much as possible.

In such a thin-film magnetic head, the spiral coil pattern may be formed in the insulating layer in the contour of the heat radiation layer, that is, in the region inside the outer edge. If the heat radiation layer spreads evenly over the area where the spiral coil pattern spreads, the heat of the spiral coil pattern will be It can be transmitted to the heat dissipation layer uniformly and efficiently. Therefore, the heat radiation of the spiral coil pattern can be surely promoted. However, the spread of the heat radiation layer may be narrower than the outer edge of the spiral coil pattern in accordance with the calorific value of the spiral coil pattern and the heat transfer characteristics of the heat radiation layer.

In order to promote heat dissipation of the spiral coil pattern, it is desirable that the heat dissipation layer be made of a metal material. In particular, if the heat radiation layer is made of a high heat conductive material having a higher thermal conductivity than the material forming the lower magnetic pole, the heat radiation of the spiral coil pattern can be more effectively promoted. Moreover, if such a high thermal conductive material shows non-magnetism, generation of unnecessary magnetic flux in the heat dissipation layer can be avoided, and therefore, the inductance of the thin film magnetic head can be reduced. it can. According to such a reduction in inductance, the response speed of the magnetization reversal can be improved in the upper pole layer and the lower pole layer when the current supplied to the spiral coil pattern is reversed.

The thin-film magnetic head as described above may further include a non-magnetic wall extending along the surface of the base layer and separating the lower pole layer and the heat dissipation layer. According to the function of the nonmagnetic wall, even when a magnetic material is used for the heat radiation layer, the magnetic coupling between the heat radiation layer and the lower magnetic pole layer can be surely inhibited. Even if the heat dissipation layer is arranged, the path of the magnetic flux is not expanded in the lower pole layer. It is desired that the non-magnetic wall has insulating properties.

The thin film magnetic head as described above may be used by being incorporated in a so-called magnetic head assembly. The magnetic head assembly may include, for example, a head slider that exposes a thin magnetic head on the medium facing surface facing the magnetic recording medium, and an elastic suspension that supports the head slider in a cantilever manner. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view schematically showing the structure of a hard disk drive (HDD).

FIG. 2 is an enlarged perspective view schematically showing the structure of a flying head slider according to a specific example. FIG. 3 is a front view schematically showing a composite thin-film magnetic head observed on the flying surface of the flying head slider.

FIG. 4 is a sectional view taken along line 4-4 in FIG.

FIG. 5 is a plan view of the thin-film magnetic head showing the shape of the upper pole layer.

FIG. 6 is a sectional view taken along the line 6-6 in FIG.

FIG. 7 is a graph showing the magnetic field strength of the thin-film magnetic head.

FIG. 8 is a graph showing the magnetic field characteristics of the thin-film magnetic head.

FIG. 9 is a plan view schematically showing one manufacturing process of the thin-film magnetic head. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 schematically shows a specific example of a magnetic recording medium drive, that is, an internal structure of a hard disk drive (HDD) 11. The HDD 11 includes, for example, a box-shaped housing main body 12 that partitions an internal space of a flat rectangular parallelepiped. One or more magnetic disks 13 as recording media are accommodated in the accommodation space. The magnetic disk 13 is mounted on the rotating shaft of the spindle motor 14. The spindle motor 14 is capable of rotating the magnetic disk 13 at a high speed such as, for example, 720 rpm or 1000 rpm. A lid or a cover (not shown) that seals the accommodation space between the housing body 12 and the housing body 12 is connected to the housing body 12.

The accommodation space further accommodates a carriage 16 that swings around a vertically extending support shaft 15. The carriage 16 includes a rigid swing arm 17 extending horizontally from the support shaft 15, an elastic suspension 18 attached to the tip of the swing arm 17 and extending forward from the swing arm 17. Is provided. As is well known, the flying head slider 19 is cantilevered at the tip of the elastic suspension 18 by the action of a so-called gimbal spring (not shown). A pressing force acts on the flying head slider 19 from the flexible suspension 18 toward the surface of the magnetic disk 13. The buoyancy acts on the flying head slider 19 by the action of the airflow generated on the surface of the magnetic disk 13 based on the rotation of the magnetic disk 13. The suspension with a relatively high rigidity during the rotation of the magnetic disk 13 due to the balance between the pressing force of the flexible suspension 18 and the buoyancy. The top head slider 19 can keep flying.

If the carriage 16 swings around the support shaft 15 while the flying head slider 19 is flying, the flying head slider 19 can cross the surface of the magnetic disk 13 in the radial direction. Based on such movement, the flying head slider 19 is positioned at a desired recording track on the magnetic disk 13. At this time, the swing of the carriage 16 may be realized through the operation of the actuator 21 such as a voice coil motor (VCM). As is well known, when a plurality of magnetic disks 13 are incorporated in the main body 12 of the housing, two elastic arms 17 are provided between adjacent magnetic disks 13 with respect to one swing arm 17. Suspension 18 is mounted.

FIG. 2 shows a specific example of the flying head slider 19. The flying head slider 1 9, A 1 ₂ 0 ₃ in the form of a flat parallelepiped - and T i C (AlTiC) made of slider body 2 2, is joined to the air outflow end of the slider body 2 2 reads head to lump write that and a a 1 ₂ 〇 ₃ head device built-in film 2 4 to the steel (alumina) with a built-in head 2 3 composite thin film magnetic. The slider body 22 and the head element built-in film 24 define a medium facing surface facing the magnetic disk 13, that is, a flying surface 25. The airflow 26 generated based on the rotation of the magnetic disk 13 is received by the air bearing surface 25.

On the floating surface 25, two rails 27 extending from the air inflow end to the air outflow end are formed. A so-called ABS (air bearing surface) 28 is defined on the top surface of each rail 27. In the ABS 28, the aforementioned buoyancy is generated in accordance with the function of the airflow 26. The composite thin-film magnetic head 23 embedded in the head element built-in film 24 forms a read gap or a write gap with ABS 28.

As shown in FIG. 3, the composite thin-film magnetic head 23 includes a read head 42 that reads magnetic information from a magnetic disk 13 by using a magnetoresistive (MR) element 41, which will be described later. Thus, the magnetic disk 13 is provided with a magnetic induction writing head, that is, a thin film magnetic head 43, for recording magnetic information on the magnetic disk 13 using a magnetic field generated by the spiral coil pattern. As is well known, the MR element 41 is sandwiched between a pair of upper and lower shield layers 44 and 45. The read gap is defined between the shield layers 44 and 45. The shield layers 44 and 45 are made of a magnetic material such as FeN or NiFe. It should be done. As the MR element 41, a giant magnetoresistance effect (GMR) element or a tunnel junction magnetoresistance effect (TMR) element can be used.

As shown in FIG. 4, the thin-film magnetic head 43 includes a lower pole layer 47 extending along an arbitrary reference plane 46 on the shield layer 45. This reference plane 4 6 is defined by the surface of the A 1 ₂ 0 ₃ such as the non-magnetic layer 4 8 which is laminated with a uniform thickness on the shield layer 4 5, for example. This nonmagnetic layer 48 cuts off magnetic coupling between the shield layer 45 and the lower pole layer 47. Around the lower magnetic pole layer 47, a heat radiation layer 49 is formed which also extends along the reference plane 46. The details of the lower magnetic pole layer 47 and the heat radiation layer 49 will be described later.

A non-magnetic gap layer 51 is formed on the lower magnetic pole layer 47 and the heat dissipation layer 49. On the non-magnetic gap layer 51, a spiral coil pattern 53 embedded in the insulating layer 52 is formed. An upper magnetic pole layer 54 is formed on the surface of the insulating layer 52. The rear end of the upper magnetic pole layer 54 is magnetically connected to the rear end of the lower magnetic pole layer 47 at the center of the spiral coil pattern 53. Thus, the upper magnetic pole layer 54 and the lower magnetic pole layer 47 form a magnetic core penetrating the center position of the spiral coil pattern 53. When a magnetic field is generated in the spiral coil pattern 53 according to the supply of the current, the magnetic flux flows in the magnetic core. The spiral coil pattern 53 may be made of a conductive metal material such as Cu.

A nonmagnetic gap layer 51 is sandwiched between the front end of the upper magnetic pole layer 54 facing the air bearing surface 25 and the front end of the lower magnetic pole layer 47 similarly facing the air bearing surface 25. Thus, a writing gap is formed. By the action of the non-magnetic gap layer 51, the magnetic flux flowing through the magnetic core leaks from the air bearing surface 25 at the front ends of the upper magnetic pole layer 54 and the lower magnetic pole layer 47. A gap magnetic field, that is, a recording magnetic field is formed by the function of the magnetic flux leaking in this manner. As is clear from FIGS. 3 and 4, between the lower magnetic pole layer 47 and the upper magnetic pole layer 54, there is a minute lower sub-pole protruding from the surface of the lower magnetic pole layer 47 toward the upper magnetic pole layer 54. A piece 55 and a small upper sub-pole piece 56 projecting from the surface of the upper pole layer 54 toward the lower pole layer 47 may also be arranged. According to the function of the lower sub pole piece 55 and the upper sub pole piece 56, a narrower write gap is defined as compared with the case where the lower pole layer 47 and the upper pole layer 54 simply face each other. be able to. This If was Ui' may if non-magnetic material is embedded such A 1 ₂ 〇 ₃ In example embodiment between the surface and the non-magnetic Giyappu layer 5 1 of the lower magnetic pole layer 4 7.

As shown in FIG. 5, the upper magnetic pole layer 54 includes a main body core layer 57 extending with a substantially uniform core width from the center position of the spiral coil pattern 53 toward the air bearing surface 25, and a main body core layer 57. And a tip pole layer 58 connected to the front end of the tip 57 and extending while reducing the core width toward the tip exposed at the air bearing surface 25. According to such an upper magnetic pole layer 54, the path of the magnetic flux flowing in the magnetic core can be narrowed as approaching the air bearing surface 25. As a result, the magnetic flux can be efficiently concentrated at the front end of the upper magnetic pole layer 54, that is, at the front end of the front magnetic pole layer 58. Such an upper pole layer 54 can greatly contribute to an increase in the recording magnetic field. The upper magnetic pole layer 54 may be made of a magnetic material such as FeN or NiFe.

Here, the lower magnetic pole layer 47 and the heat radiation layer 49 will be described in detail with reference to FIG. The lower magnetic pole layer 47 includes a main body core layer 61 extending from the center position of the spiral coil pattern 53 toward the air bearing surface 25 with a substantially uniform core width, similarly to the upper magnetic pole layer 54 described above. The core width of the main body core layer 61 may be set to be substantially the same as the back gap 62, which is the joint with the upper magnetic pole layer 54. That is, the spiral coil pattern 53 protrudes largely from the rear end and both sides of the main core layer 61. Thus, the extension of the lower pole layer 47 is limited. The path of the magnetic flux is relatively narrowed.

To the front end of the main body core layer 61, a tip magnetic pole layer 63 extending while reducing the core width toward the tip exposed at the air bearing surface 25 is connected. According to such a tip magnetic pole layer 63, the path of the magnetic flux flowing in the lower magnetic pole layer 47 can be narrowed as approaching the air bearing surface 25. Thus, the lower pole layer 47 is defined by a contour corresponding to the contour of the upper pole layer 54 described above. As a result, similarly to the upper magnetic pole layer 54, the magnetic flux can be efficiently concentrated at the front end of the lower magnetic pole layer 47, that is, at the front end of the front magnetic pole layer 63. The lower pole layer 54 may be made of a magnetic material such as FeN or NiFe.

As is clear from FIG. 6, the inside of the heat dissipation layer 49 is defined by the contour of the lower pole layer 47. On the other hand, the outer edge of the heat radiation layer 49 is defined by a rectangle larger than the outer edge of the spiral coil pattern 53. That is, the area including the spiral coil pattern 53 is It is limited to the outline of the heat radiation layer 49, that is, the inside of the outer shell. The front end of the heat radiation layer 49 faces the air bearing surface 25. Radiating layer 4-9, for example it may be made of a metallic material having a higher thermal conductivity than A 1 ₂ 0 _3. Here, the same material as the lower magnetic pole layer 47 is used for the heat radiation layer 49. Such a heat radiation layer 49 can efficiently absorb the heat of the spiral coil pattern 53. Around the heat radiating layer 4 9, along connexion spread to the reference plane 4 6 A 1 ₂ 0 ₃ such as the non-magnetic layer 6 4 is formed.

A nonmagnetic wall 65 extends between the heat radiation layer 49 and the lower magnetic pole layer 47 along the above-described reference plane 46. The non-magnetic wall 65 separates the heat radiation layer 49 and the lower magnetic pole layer 47 from each other. According to the function of the nonmagnetic wall 65, even if a magnetic material is used for the heat radiation layer 49, the magnetic coupling between the heat radiation layer 49 and the lower magnetic pole layer 47 is hindered. Can be done.

Now, assume that a write signal is supplied to the thin-film magnetic head 43. When a current is supplied to the spiral coil pattern 53, a magnetic field is generated in the spiral coil pattern 53. The magnetic flux flows through the upper magnetic pole layer 54 and the lower magnetic pole layer 47 based on the generated magnetic field. At this time, the path of the magnetic flux in the lower magnetic pole layer 47 is narrowed as much as in the upper magnetic pole layer 54, so that the recording magnetic field is efficiently generated in the write gap. A maximally strong recording magnetic field is established.

Each time the binary information specified by the write command is inverted, the direction of the current supplied to the spiral coil pattern 53 is inverted. When the direction of the current is reversed, the magnetic flux flowing through the upper pole layer 54 and the lower pole layer 47 is reversed. At this time, the surface area of the lower magnetic pole layer 47 is reduced to the maximum as in the case of the upper magnetic pole layer 54, so that the generation of the eddy current on the surface of the lower magnetic pole layer 47 is suppressed. When the generation of the eddy current is suppressed in this way, the magnetization can be instantaneously reversed in the lower pole layer 47. As a result, in the thin-film magnetic head 43, the response speed to the inversion of the binary information specified by the write command is increased. The thin-film magnetic head 43 can respond to a write command in a higher frequency range.

When a current is supplied to the spiral coil pattern 53 as described above, the spiral coil pattern 53 generates heat. The heat of the spiral coil pattern 53 is efficiently transmitted to the heat dissipation layer 49 in addition to the lower pole layer 47 and the upper pole layer 54. Lower pole layer 4 7, upper The surfaces of the magnetic pole layer 54 and the heat radiation layer 49 can contribute to heat radiation of the spiral coil pattern 53. As a result, heat radiation from the spiral coil pattern 53 is promoted. Excessive temperature rise of the spiral coil pattern 53 is largely avoided.

The present inventors have verified the magnetic field characteristics of the thin-film magnetic head 43 as described above. For this verification, numerical analysis was performed according to the three-dimensional finite element method. At this time, the magnetic field characteristics of the thin film magnetic head according to the comparative example were simultaneously analyzed. In this comparative example, the aforementioned nonmagnetic wall 65 was removed, and the aforementioned lower magnetic pole layer 47 and the heat dissipation layer 49 were completely integrated. That is, the lower magnetic pole layer was formed in a rectangular shape larger than the outer edge of the spiral coil pattern 53.

As a result of the verification, as shown in FIG. 7, it was demonstrated that the thin-film magnetic head 43 described above generates a larger recording magnetic field than the thin-film magnetic head according to the comparative example. However, as is clear from FIG. 8, it was demonstrated that the reversal of the magnetomotive force applied to the spiral coil pattern 53, that is, the reversal of binary information, responded more quickly than the thin film magnetic head according to the comparative example. Was. Here, the magnetomotive force is represented by the product of the magnitude [A] of the current supplied to the spiral coil pattern 53 and the number of turns [Turn] of the spiral coil pattern 53.

Next, a method of manufacturing the thin film magnetic head 43 will be briefly described. On this pre Me AlTiC made of wafer one (not shown) in the production, according to known methods, embedded in the shield layer 4 4, 4 5 and the shield layer 4 4, 4 while an example A 1 ₂ 〇 ₃ of 5 The MR element 41 is built. On the shield layer 45, a non-magnetic layer 48 is formed with a uniform thickness. Thus, a reference plane 46 is defined on the surface of the nonmagnetic layer 48. Subsequently, on the reference plane 46, for example, as shown in FIG. 9, a photoresist film 71 imitating the contours of the lower magnetic pole layer 47 and the heat radiation layer 49 is formed. At this time, the photoresist film 71 creates a wall 71 a corresponding to the nonmagnetic wall 65 between the contour of the lower magnetic pole layer 47 and the inner edge of the heat radiation layer 49. Thereafter, plating is performed on the reference plane 46 with a magnetic material such as FeN or NiFe. As is well known, when this electrolytic plating method is used, a plating base film for energization may be formed on the surface of the nonmagnetic layer 48 in advance. Through this deposition, the lower magnetic pole layer 47 and the heat radiation layer 49 are formed. After the formation, the photoresist film 71 is removed. Subsequently, the non-magnetic material such on the reference plane 4 6, for example A 1 ₂ 〇 ₃ Ru are stacked. Thereafter, when the lower magnetic pole layer 47 and the heat radiation layer 49 are subjected to a flattening process until they are exposed, a nonmagnetic wall 65 is established between the lower magnetic pole layer 47 and the heat radiation layer 49. At the same time, a non-magnetic layer 64 extending along the reference plane 46 is established around the heat radiation layer 49. After the lower magnetic pole layer 47, the heat dissipation layer 49, the nonmagnetic wall 65, and the nonmagnetic layer 64 are formed, the lower sub pole piece 55 and the nonmagnetic gap layer 5 are formed on the flattened exposed surface. 1, the upper sub pole piece 56, the insulating layer 52, the spiral coil pattern 53, and the upper pole layer 54 are sequentially laminated. A well-known forming method may be used for forming such a laminate. Head 4 3 to read thus formed to head 4 2 and thin film magnetic is eventually embedded into the A 1 ₂ 〇 _three layers. The head element built-in film 24 is formed. Thereafter, the individual flying head sliders 19 are cut out of the wafer.

In the thin-film magnetic head 43 described above, a non-magnetic material may be used for forming the heat dissipation layer 49 described above. By employing such a non-magnetic material, generation of unnecessary magnetic flux in the heat dissipation layer 49 can be avoided. The properties of the thin-film magnetic head 43 can be further enhanced. In this case, the aforementioned non-magnetic wall 65 may be removed. When a material different from the material of the lower magnetic pole layer 47 is used for forming the heat radiation layer 49, the lower magnetic pole layer 47 and the heat radiation layer 49 are separately laminated on the reference plane 46. Just do it.

In the above-described thin-film magnetic head 43, a high thermal conductivity material having a higher thermal conductivity than the material of the lower magnetic pole layer 47 may be used in forming the heat radiation layer 49. desired. For example, when FeN or NiFe is used for the lower magnetic pole layer 47 as described above, a high thermal conductivity material such as Cu may be used for the heat radiation layer 49. With the use of such a material, the heat of the spiral coil pattern 53 can be more efficiently transmitted to the heat radiation layer 49. Therefore, an excessive rise in temperature of the spiral coil pattern 53 can be more effectively avoided as compared with the case where the same material as the lower magnetic pole layer 47 is used in forming the heat radiation layer 49.

Further, in the above-described thin-film magnetic head 43, the spread of the heat radiation layer 49 may be adjusted based on the heat generation amount of the spiral coil pattern 53 and the heat transfer characteristics of the heat radiation layer 49. As long as sufficient heat radiation characteristics are obtained, the outer edge of the heat radiation layer 49 may be defined to be smaller than the outer edge of the spiral coil pattern 53.

The thin film magnetic head 43 as described above can be used not only for the HDD 11 as described above, but also for other magnetic recording medium drives such as magnetic disk drives and magnetic tape drives. May be done.

Claims

The scope of the claims

1. A lower pole layer that extends along the surface of the base layer while reducing the core width toward the tip facing the medium facing surface, a heat dissipation layer that extends along the surface of the base layer around the lower pole layer, and heat dissipation A thin-film magnetic head, comprising: a non-magnetic layer extending along the surface of the base layer around the layer.

2. The thin-film magnetic head according to claim 1, wherein the spiral coil pattern formed in the insulating layer inside the contour of the heat dissipation layer, and the lower magnetic pole layer at a center position of the spiral coil pattern. And a top pole layer that extends along the surface of the insulating layer while narrowing the core width toward the front end facing the medium facing surface.

3. The thin film magnetic head according to claim 2, wherein the heat radiation layer is made of a metal material.

4. The thin film magnetic head according to claim 3, wherein the heat radiation layer is made of a high heat conductive material having a higher heat conductivity than a material forming the lower magnetic pole. Thin film magnetic head.

5. The thin-film magnetic head according to claim 3, wherein the heat dissipation layer is made of a non-magnetic material.

6. The thin-film magnetic head according to claim 5, wherein the heat radiation layer is made of a high heat conductive material having a higher heat conductivity than a material forming the lower magnetic pole. Thin film magnetic head.

7. The thin film magnetic head according to claim 3, wherein a nonmagnetic wall separating the lower pole layer and the heat dissipation layer is formed on a surface of the base layer. Magnetic head.

8. The thin-film magnetic head according to claim 7, wherein the heat radiation layer is made of a high heat conductive material having a higher heat conductivity than a material forming the lower magnetic pole. Thin film magnetic head.

9. The thin-film magnetic head according to claim 7, wherein the heat dissipation layer is made of a non-magnetic material.

10. The thin film magnetic head according to claim 9, wherein the heat radiation layer is made of a high heat conductive material having a higher heat conductivity than a material forming the lower magnetic pole. Magnetic head.

11. The thin-film magnetic head according to claim 7, wherein the non-magnetic wall has an insulating property.

12. The thin-film magnetic head according to claim 11, wherein the heat radiation layer is made of a high heat conductive material having a higher heat conductivity than the material forming the lower magnetic pole. Thin film magnetic head.

13. The thin-film magnetic head according to claim 11, wherein said heat radiation layer is made of a non-magnetic material.

14. The thin-film magnetic head according to claim 13, wherein the heat radiation layer is made of a high heat conductive material having a higher heat conductivity than the material forming the lower magnetic pole. Thin film magnetic head.

15. A head slider that defines the medium facing surface, an elastic suspension that cantileverly supports the head slider, and a tip formed on the head slider that faces the medium facing surface A lower pole layer that extends along the surface of the base layer while decreasing the core width toward the bottom, a heat dissipation layer that extends along the surface of the base layer around the lower pole layer, and a surface of the base layer that surrounds the heat dissipation layer A magnetic coupling is established between the non-magnetic layer that extends along the gap, the conductive coil pattern formed in the insulating layer inside the contour of the heat dissipation layer, and the lower magnetic pole layer at the center of the conductive coil pattern. A magnetic head assembly comprising: an upper pole layer that extends along the surface of the insulating layer while narrowing the core width toward the front end facing the surface.

16. Lower shield layer, upper shield layer, sandwiched between lower shield layer and upper shield layer, formed on the magnetoresistive element facing the medium facing surface, and on the surface of upper shield layer A non-magnetic layer, a lower pole layer that extends along the surface of the non-magnetic layer while reducing a core width toward a front end facing the medium facing surface, and is formed at least partially in the insulating layer on the lower pole layer. The spiral coil pattern and the upper magnetic pole layer spread along the surface of the insulating layer while narrowing the core width toward the front end facing the medium, establishing magnetic coupling between the lower magnetic pole layer and the center of the spiral coil pattern. A composite thin-film magnetic head comprising: