JPH0232682B2 - JIKIHETSUDO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and particularly to a magnetic head using a perpendicular recording method.

When high-density magnetic recording (short wavelength recording) is performed, magnetization in the thickness direction of the magnetic tape is preferred, rather than the so-called longitudinal recording method in which recording is performed by magnetization in the direction of relative movement between the magnetic tape and the magnetic head. ,
It is known that the so-called perpendicular recording method is more advantageous. This is because in the longitudinal recording method, the self-demagnetizing field becomes larger as the recording signal becomes shorter in wavelength, whereas in the perpendicular recording method, the self-demagnetizing field in the magnetic layer becomes smaller.

Various types of magnetic heads have been proposed for use in this perpendicular recording method, but in order to ideally perform recording (magnetization) in this perpendicular recording method, the main component of the magnetic field emitted from the magnetic head must be must be as perpendicular to the magnetic medium as possible. As shown in FIG. 1, such a magnetic head h includes a main magnetic pole 2 made of, for example, a permalloy thin film, which faces the magnetic recording medium 1 between them.
There is an auxiliary pole excitation type magnetic head which has an auxiliary magnetic pole 3 and a coil 4 wound around the auxiliary magnetic pole 3.

However, in this case, since it is necessary to place the auxiliary magnetic pole 3 behind the medium 1 and close to the medium 1, there is a drawback that the actual assembly and handling operations such as mounting of the magnetic medium are complicated.

In order to avoid such drawbacks, as shown in FIG. 2, a magnetic medium 1 has a structure in which a magnetic layer 7 backed by a high magnetic permeability material layer 6 is provided on a non-magnetic base 5. An auxiliary core 8 with high magnetic permeability is placed as a magnetic head on one or both surfaces of the main magnetic pole 2 at a position recessed from the tip of the main magnetic pole 2, that is, the sliding contact surface with the magnetic medium, and the coil 4
There is a device in which a main pole type single magnetic head h formed by winding a magnetic head on an auxiliary core 8 is arranged to perform recording.

However, since this type of magnetic head h has an open magnetic path configuration, its recording efficiency is generally lower than that of a ring-type magnetic head. Improving this recording efficiency is very important, and considering use at high frequencies, it is desirable to lower the impedance of the coil to facilitate driving.

As shown in FIG. 3 for this type of magnetic head h, let the distance between the main magnetic pole 2 and the center of the coil 4 be a, the length of the main magnetic pole 2 be b, and a/b1 to 1.5.
It has been experimentally and theoretically determined that this method has the highest recording efficiency. Furthermore, it is obvious that the recording efficiency can be increased and the impedance of the coil 4 can be lowered by winding the coil 4 as close to the tip of the auxiliary core 8 as possible and by reducing the winding diameter. The problem is how to make use of such a magnetic head to realize it.

In the magnetic head as shown in Fig. 3,
If the distance a between the main pole 2 and the center of the coil 4 is made smaller in order to increase the recording efficiency, the core becomes thinner and mechanical strength becomes a problem, and there is an actual upper limit.
Therefore, as shown in FIG. 4, a magnetic head is constructed by arranging non-magnetic protectors 10, 10' with winding window holes 9, 9' formed on the outer surfaces of auxiliary cores 8, 8' that sandwich the main magnetic pole 2. has been devised. This magnetic head is manufactured by the steps shown in FIG. First, one of the auxiliary cores 8 and one of the auxiliary cores 8 are attached to a non-magnetic block 11 that will become one of the protectors 10 and has a concave portion 11a forming the winding window hole 9 and an adhesive surface 11b to which one of the auxiliary cores 8 is bonded. A magnetic plate-like block 12 made of ferrite or the like is adhered with a glass adhesive 13 from the inner surface of the tip of the recess 11a to the adhesive surface 11b. Next, one composite block 14 is formed by mirror polishing the magnetic plate block 12 from the outer surface of the tip of the concave portion 11a of the non-magnetic block 11 to the side surface of the magnetic plate block 12 to a desired thickness. , the main pole film 2 is attached to this mirror-finished surface 14a. Then, the other composite block 14' manufactured in the same manner as the composite block 14 of the non-magnetic block 11 and the magnetic plate-like block 12 described above is joined to the other side of the main pole film 2. Thereafter, this joined body is cut with respect to the main magnetic film 2 to have a predetermined track width, and is adhered to a head mounting base (not shown), and the sliding surface with the magnetic medium is polished to form the recesses 11a, 11a. By winding the coil 4 through the winding windows 9, 9', the magnetic head shown in FIG. 4 is obtained.

By configuring the magnetic head in this way, even if the winding portion of the coil 4 is made thinner, the mechanical strength can be maintained because it is supported by the non-magnetic protectors 10 and 10' on both sides. Core 8, 8'
can be made thinner.

However, in a magnetic head with such a configuration, the non-magnetic blocks 11, 11' and the magnetic plate block 1
The following problems arise in the manufacturing process of composite blocks 14, 14' using blocks 2, 12'.

(1) When processing the non-magnetic blocks 11, 11',
The machining accuracy of the winding window hole recesses 11a, 11a', especially the tip inner surfaces p, p' of the winding window hole recesses 11a, 11a' and the joint surfaces 11b, 11b' of the magnetic plate blocks 12, 12'. It is difficult to improve the machining accuracy of the angle formed by the (See Figure 6A).

(2) Therefore, if the magnetic plate blocks 12, 12' are bonded together, the processing accuracy of the non-magnetic blocks 11, 11' cannot be improved, and since the bonding points are not on the same plane, it is difficult to make the adhesive layer thinner. It is. (See Figure 6B).

(3) As the adhesive layer becomes thicker, air bubbles c are likely to occur in it, and even if the adhesives 13 and 13' are made of glass, they are softer than general ferrite, etc., and dents d occur during mirror polishing. Naturally, as the layer becomes wider, the recess d becomes larger and deeper. (See Figure 7).

(4) On top of this, sputter a magnetic thin film that will become the main pole.
If it is attached by a method such as vapor deposition, bubbles c or dents d
A step break occurs in the portion, or even if it does not break, the magnetic thin film becomes thinner and the magnetic properties deteriorate.

There are drawbacks such as.

SUMMARY OF THE INVENTION The present invention aims to improve these drawbacks, provide a perpendicular recording head that is suitable for mass production, and has improved recording and reproducing efficiency.

Embodiments of the present invention will be described with reference to FIG. 8 and subsequent figures. In the figures, H generally indicates a magnetic head according to the present invention. FIG. 8 shows a first embodiment of a magnetic head according to the present invention. The magnetic head H in this example has a main magnetic pole 2 made of a thin film layer of soft magnetic material.
2 are joined together with a protective film 23 on one side and a guard material block sandwiched from both sides. The guard material blocks 24, 24' are formed of non-magnetic material parts 25, 25' extending from the contact surface of the magnetic medium to a required position, and magnetic material parts 26, 26' joined to the rear of the non-magnetic material parts 25, 25'. Material part 26,2
6' includes auxiliary magnetic pole parts 27, 27' that are joined to the main magnetic pole 22 and around which the coil 4 is wound, and return path parts 28, 2 that serve as return paths for the magnetic flux of the main magnetic pole 22.
A coil 24 is wound around the main magnetic pole 22 through the grooves 29, 29' via auxiliary magnetic pole parts 27, 27'.

A method of manufacturing this perpendicular recording magnetic head will be explained with reference to FIG.

First, a non-magnetic plate block 31 and a magnetic material block 32 are prepared. This non-magnetic plate block 3
1 is non-magnetic ferrite (Zn ferrite),
Forsterite, photoceram, crystallized glass, barium titanium, potassium titanate, Al ₂ O ₃
- The magnetic material block 32 can be made of Mn-Zn-based, Ni-Zn-based ferrite, etc., but the non-magnetic plate-like block 31 and the magnetic material block 32 have a coefficient of thermal expansion. It is desired that the non-magnetic plate block 31 and the magnetic material block 32 be made of non-magnetic and magnetic ferrite, respectively.
One surface of each of the non-magnetic plate block 31 and the magnetic material block 32 is mirror polished. Next, grooves 33 are formed at required intervals on the mirror-polished surface 32a of the magnetic material block 32. In this state, the mirror polished surface 32a of the magnetic material block 32 is joined to the mirror polished surface 31a of the non-magnetic plate block 31, facing each other. This bonding can be performed using a glass fusion surface or an epoxy adhesive, an inorganic adhesive, or an adhesive 34 such as water glass, but glass fusion is preferable since glass fusion may be performed again in a later process. Use high-temperature glass that does not melt during the second fusion. Next, the joined body 35 of the non-magnetic plate-like block 31 and the magnetic material block 32 is assembled to the desired thickness along the planes shown by chain lines m ₁ , m ₂ , m ₃ . 32 to cut out a plurality of composite plate-like bodies 36 that will become one of the guard material blocks 24, 24'. Then, one main surface 36a of the plate-like body 36 extending between the non-magnetic plate-like block 31 and the magnetic material block 32 is mirror-finished. In this mirror finish, in order to improve recording and reproducing efficiency, the thickness of the auxiliary magnetic pole section 27 near the tip of the main magnetic pole 22 is adjusted to a/b as explained in FIG. 3 above.
On the other hand, since the size of the dividing groove 29 cannot be made too small in order to sufficiently wind the coil, the edge of the groove 33 that becomes the dividing groove 29 is likely to break during polishing. Therefore, in order to ensure strength, the groove 33 of the magnetic material block 32 is formed into a trapezoid, and the auxiliary magnetic pole part 27 is made tapered.
Furthermore, it is desirable that the corners of the bottom portion corresponding to the lower part of the auxiliary magnetic pole portion 27 be rounded. In addition, the auxiliary magnetic pole part 2
Since the tip of 7 needs to be made thin, it is reinforced by covering it with adhesive glass to maintain its strength. By forming the auxiliary magnetic pole portion 27 in a tapered manner as described above, the recording and reproducing efficiency is improved.

Mirror surface 36 of composite plate-like body 36 formed in this way
For example, the thickness of the main magnetic pole 22 described above in a.
A magnetic thin film 37 of 0.5 to 3 μm made of permalloy, sendust, magnetic amorphous, etc. is deposited by sputtering, vapor deposition, ion plating, etc., and photoetched so that the main pole 22 is formed with the required track width and spacing. Next, an insulating protective film 38 of SiO ₂ , Si ₃ N ₄ , Al ₂ O ₃ or the like to form the protective film 23 is deposited thereon by sputtering, vapor deposition, ion plating, or the like. Thereafter, a composite plate-like body 36', which will become the other guard material block 24', manufactured in the same manner as the above-described composite plate-like body 36, is adhered from the insulating protective film 38 side. Although it is desirable to use a glass adhesive as the adhesive 39 from the standpoint of improving reliability, it is also possible to use an inorganic adhesive such as water glass or an organic adhesive such as epoxy resin.

In this case, a groove corresponding to the magnetic thin film 37, which will become the main magnetic pole 22, is formed in advance on the joint surface of the other composite plate 36' by, for example, etching, and an adhesive is filled in this groove. It is also possible to bond both composite plates 36 and 36' together.

Then, as shown by chain lines n ₁ , n ₂ , . . . , each band-shaped magnetic thin film 27 is cut, adhered to a head mounting base (not shown), and the tip end surface, that is, the surface side of the magnetized plate block 31, is polished. , a sliding contact surface S with the magnetic medium is formed here. In this way, the main magnetic pole 22 made of the magnetic thin film 37 is provided facing the sliding surface S with the magnetic medium, and the main magnetic pole 22 has non-magnetic material portions 25, 25' on both sides of its tip.
is arranged, and behind it are magnetic material parts 26, 26'.
are arranged, and the magnetic material parts 26, 2
According to the present invention, the coil 4 is wound in the grooves 29, 29' formed in the grooves 29, 29' to separate the auxiliary magnetic pole parts 27, 27' and the magnetic flux return path parts 28, 28' of the main magnetic pole part 22. A magnetic head H is obtained.

As shown in FIG. 10, the magnetic head H of this example configured in this manner is designed for a magnetic medium 1 having a magnetic layer 7 backed by a high magnetic permeability material layer 6 on a non-magnetic base 5. The magnetic flux φ of the main magnetic pole 22 is returned through the magnetic layers 6 and 7 to the return path portions 28 and 28' which are separated from the auxiliary magnetic pole portions 27 and 27'.

And it has the following characteristics.

(1) When manufacturing a composite block made of non-magnetic and magnetic materials, the joint surfaces are flat, so mirror polishing is possible, and processing accuracy can be easily increased, making it extremely thin. Furthermore, since it is bonded on the surface, the gluing process is easy, and therefore the conventional drawbacks such as bubbles and dents in the adhesive layer do not occur, and the structure of the groove that serves as the winding window is simple. It can be easily formed in a single process.

(2) In addition, the magnetic head having the structure shown in FIGS. 4 and 5 described above must be manufactured by gluing the composite blocks one by one, but according to the present invention, the composite blocks are glued once and then cut. It is suitable for mass production because a large number of composite blocks can be manufactured with just one.

(3) In order to make the shape of the auxiliary magnetic pole near the tip of the main magnetic pole tapered in order to increase mechanical strength and to improve recording and reproducing efficiency, in the conventional example described above, one ferrite block constituting the auxiliary magnetic pole was used. It is necessary to process the block into a tapered shape, and as the shape of the block becomes complicated, it is difficult to improve the processing accuracy, and furthermore, the processing requires a lot of effort. Since it only needs to be used, machining accuracy is improved and machining is simple.

(4) Furthermore, according to the present invention, the auxiliary magnetic pole part is formed into a large block in the form of a plate, and the magnetic pole part on the opposite side of the winding window hole part, that is, the magnetic pole parts on both sides, become the return path for the recording and reproducing magnetic field. Therefore, recording and reproducing efficiency is greatly improved.

(5) In addition, in the conventional magnetic head mentioned above, the adhesion range of non-magnetic material is wider than that of thin magnetic material.
Moreover, since it is bonded on two sides, there is a risk that the magnetic material will crack if materials with the same coefficient of thermal expansion are not used. However, according to the present invention, the non-magnetic material part is thin and small, so the bonding length is also small and the magnetic material can be broken. The range of thermal expansion coefficients that can be bonded is not as strict as in conventional magnetic heads, and the range of material selection is widened accordingly.

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

In this example, one half of the guard material block in the first example described above is made of only non-magnetic material. That is, the magnetic head according to this example is constructed by having a main magnetic pole 22 made of a thin layer of soft magnetic material coated with an insulating protective film 23 on one side and sandwiched between guard material blocks from both sides.
One guard material block 24 is a composite body consisting of a non-magnetic material portion 25 extending from the magnetic medium contacting surface to a required position and a magnetic material portion 26 largely joined to the rear side of the non-magnetic material portion 25. At the joining interface between the non-magnetic material part 25 and the magnetic material part 26, there is an auxiliary magnetic pole part 27 which is magnetically joined to the main magnetic pole 22 and becomes an auxiliary magnetic pole of a required width, and a return which becomes a return path for the magnetic flux of the main magnetic pole 22. A groove portion 29 is formed to separate the path portion 28 from the groove portion 29 . Also, the guard material block 2 of the other half
4' is formed of only a non-magnetic material part in the same shape as one guard material block 24, that is, the non-magnetic material part 25 corresponds to the non-magnetic material part 25 and magnetic material part 26 of one guard material block 24. ' and a non-magnetic material part 25'', both non-magnetic material parts 25',
A groove 29' corresponding to the groove 29 is formed between 25'', and the coil 4 is wound around the main pole through this groove 29' and the above-mentioned groove 29, thereby forming a magnetic head for perpendicular recording.

The manufacturing process of the magnetic head of this example will be explained with reference to FIG.

First, a non-magnetic material block 41 and a non-magnetic material plate block 42 are prepared, and one side 41a and 42 of each are prepared.
Mirror polish a. Next, a groove 43 that will become the dividing groove portion 29' is formed in the mirror surface 41a of the non-magnetic material block 41. Then, the non-magnetic block 41 and the non-magnetic plate block 42 are joined with mirror surfaces 41a and 42a facing each other to form a joined body. In this case, the non-magnetic block 41 and the non-magnetic plate block 42 are preferably joined by glass fusion. The thus formed joined body is cut to a required thickness across both blocks 41 and 42 to cut out a plurality of plate-shaped bodies 44 that will become guard material blocks 24'. One surface of this plate-like body 44, that is, the surface 4 on the front side of the groove 43
4a is mirror-finished, and on this surface 44a, a layer having a thickness of, for example, 0.5 to
A 3 μm magnetic thin film 45 made of armory, sendust, magnetic amorphous, etc. is deposited by sputtering, vapor deposition, ion plating, or the like.
This magnetic thin film 45 is removed by, for example, photo-etching, leaving parallel strips so that the main pole film 22 is formed with the required track width and spacing. Next, SiO ₂ , Si ₃ N ₄ , Al ₂ O ₃ is deposited on one main surface 44a of the non-magnetic plate 44 from above this strip-shaped magnetic thin film 45.
An insulating protective film 46 such as the like is applied.

On the other hand, a composite plate-like body, that is, a non-magnetic plate-like block 47 similar to that explained in the first embodiment shown in FIG.
and a magnetic material block 49 in which a groove 48 that becomes the groove part 29 is formed, and one main surface thereof is connected to the auxiliary magnetic pole part 27.
is mirror-polished to a required thickness to form a composite plate-like body 50, and this composite plate-like body 50 is placed on the one main surface 44a side of the non-magnetic plate-like body 44, that is, on the magnetic thin film 45. The insulating protective film 46 is adhered to the side of the insulating protective film 46. In this case, it is desirable to use glass fusion bonding from the viewpoint of improving reliability, but other adhesives may also be used. The assembled body is then cut into strips of magnetic thin film 45, and the tip surfaces thereof, that is, the surfaces on the side of non-magnetic material plate portions 42 and 47, are polished to form sliding contact surfaces with the magnetic medium.
Thereafter, the coil 4 is wound around the grooves 43, 48, that is, the dividing grooves 29, 29' of the plate-like bodies 50, 44, which become the guard material blocks 24, 24', thereby forming the magnetic head H shown in FIG. configured.

The magnetic head of the second embodiment constructed in this manner can also provide substantially the same performance as the magnetic head of the first embodiment described above. In addition, in the magnetic head of this example, the magnetic thin film 4 which becomes the main magnetic pole 22 is
5 is adhered to the non-magnetic guard material block 24' formed of the same non-magnetic material, so that no breaks occur in the magnetic thin film 45. That is, in the non-magnetic guard material block, the block portion 41 provided with the groove 43 serving as the dividing groove portion 29' and the plate-shaped block portion 42 joined thereto are formed of the same non-magnetic material, so that the surface to which the magnetic thin film 45 is adhered is made of the same non-magnetic material. This is because a substantially perfect mirror surface is formed across both portions 41 and 42 with almost no step difference occurring during mirror polishing. In addition, if there is a difference in hardness between the magnetic block portion 49 of the composite plate 50 and the non-magnetic plate 47 that are bonded to the magnetic thin film surface of the non-magnetic plate 44, the adhesion Although the layer becomes wider, if a reliable adhesive method such as glass fusion is used, it is possible to prevent deterioration of recording and reproducing characteristics due to a slightly wider adhesive layer.

FIGS. 13 and 14 show a third embodiment of the present invention. In the magnetic head according to this embodiment, the width of the auxiliary magnetic pole is formed to be approximately the same as the width of the main magnetic pole regardless of the thickness of the head, and the width of the auxiliary magnetic pole is formed to be approximately the same as the width of the main magnetic pole. The impedance of the motor is lowered to facilitate high-frequency driving.
That is, the magnetic head according to this example has a protective film 23 on one surface of a main magnetic pole 22 made of a thin film of soft magnetic material.
The guard material blocks 24, 24' which join the main magnetic pole 22 and sandwich the main magnetic pole 22 from both sides are joined to the non-magnetic material parts 25, 25' which extend from the surface facing the magnetic medium to a required position.
and magnetic material portions 26, 26', and an auxiliary magnetic pole of a required width is magnetically bonded to the main magnetic pole 22 at the bonding interface between the non-magnetic members 25, 25' and the magnetic members 26, 26'. The auxiliary magnetic pole parts 27, 27'
and the return path portions 28, 28' that serve as return paths for the magnetic flux of the main magnetic pole 22.
Furthermore, in the auxiliary magnetic pole parts 27, 27' and the return path parts 28, 28', the magnetic members 26, 26' are made of non-magnetic material 30,
30', and a coil 4 is wound around the main pole 22 through the grooves 29, 29' to constitute a perpendicular recording magnetic head.

Next, a method of manufacturing the perpendicular recording magnetic head of this example will be explained with reference to FIG.

First, for example, Mn-Sn ferrite or Ni-
Magnetic block 51 made of Zn-based ferrite, etc.
For example, a non-magnetic plate-like body 52 made of glass ceramics, non-magnetic Mn-based ferrite, etc. is prepared, and one main surface 51a of the magnetic block 51 is cut into a U-shape or a platform so as to match the cutting interval described later. A shaped groove 53 is formed, and this groove 53 is filled with a non-magnetic material 54 such as glass. Then magnetic block 5
1 and the surface of the nonmagnetic material 54 are mirror polished. In this mirror polishing, the non-magnetic material 54
The depth of the groove 53 filled with the above-mentioned auxiliary magnetic pole part 2 is
It is desirable that the depth be slightly shallower than the depth of the dividing groove portion 29 between the groove portion 7 and the return path portion 28 . Further, the width of the groove 53 is set so that the exposed width of the magnetic material 51 on the mirror-polished surface 51a matches the track width or is slightly wider.

When forming this groove 53, care must be taken to avoid cracking the edge of the magnetic material 51, and if there is a risk of cracking, the groove width must be narrowed to the extent that this will not occur. .

Next, grooves 55, which will become the aforementioned dividing grooves 29, are formed at required intervals on the main surface 51a of the magnetic block 51 in a direction perpendicular to the grooves 53 filled with the non-magnetic material 54. Then, the non-magnetic plate-like body 52 is bonded to this main surface 51a by mirror polishing its main surface 52a. The non-magnetic plate 52 is bonded to the non-magnetic material 52 filled in the groove 53.
It is desirable to use glass at a high temperature such that the glass does not melt, and it is also possible to use an inorganic adhesive such as water glass or an organic adhesive such as epoxy resin.

After joining the magnetic material block 51 and the non-magnetic plate-like material 52 in this manner, they are cut along the planes shown by chain lines m ₁ , m ₂ , m ₃ , . . . to form a plurality of guard material blocks 24. A composite plate-like body 56 is cut out. Next, the main pole forming surface 5 extending from the magnetic block 51' to the non-magnetic plate 52' of this composite plate 56
After polishing 6a to a mirror surface, a magnetic thin film 57 made of, for example, armory, sendust, magnetic amorphous, etc. with a thickness of 0.5 to 3 μm, which will finally constitute the main magnetic pole 22 described above, is deposited on this surface by sputtering, vapor deposition, ion plating, etc. Deposited by method. Next, the magnetic thin film 57 is removed, for example, by photoetching, leaving a balanced band shape with a predetermined track width and spacing. In this case, the strip-shaped magnetic thin film 57 is formed so as to be positioned between the grooves 53 filled with the non-magnetic material 54 of the magnetic block 51, that is, on the auxiliary magnetic pole portion. Furthermore, an insulating protective film layer 58 of SiO ₂ , Si ₃ N ₄ , Al ₂ O ₃ or the like, which will become the protective film 23, is formed on the main surface 56a of the composite plate-like body 56 from above the strip-shaped magnetic thin film 57.
be coated with. Therefore, a composite plate-like body 56' that is formed in the same manner as the composite plate-like body 56 and becomes the other guard material block 24' is prepared, and one main surface 56a' of the composite plate-like body 56' is polished to a mirror finish. It is bonded to the surface 56a side with an insulating protective film 58 interposed therebetween. In this case, the auxiliary magnetic pole part of the other composite plate-like body 56' is opposed to the auxiliary magnetic pole part of one composite plate-like body 56, and the strip-shaped magnetic thin film 57
Glue it in a way that holds it in place. And the dashed lines n ₁ , n ₂ ,
As shown in n ₃ , . . . , each strip-shaped magnetic thin film 57 is cut and its tip end surface is polished to form a sliding contact surface with the magnetic medium. In this way, the main magnetic pole 22 is provided facing the sliding surface with the magnetic medium, and this main magnetic pole 22
Non-magnetic material parts 25, 25' are arranged on both sides of the tip of the main pole, and auxiliary magnetic pole parts 27, 25' held by non-magnetic material parts 30, 30' are arranged behind the main pole parts 25, 25' according to the width of the main magnetic pole.
A magnetic head H of this example shown in FIG. 13 is obtained in which magnetic material parts 26 and 26' having magnetic flux return parts 27' and 27' are arranged.

In this way, the magnetic head of this example has the width of the auxiliary magnetic pole approximately equal to the width of the main magnetic pole, and the auxiliary magnetic pole is held by a non-magnetic member, so that the width of the auxiliary magnetic pole is proportional to the thickness of the head. Even if the width is narrow, sufficient mechanical strength is ensured, and since the auxiliary magnetic pole is narrow and approximately the same width as the main magnetic pole, the impedance of the coil wound around the auxiliary magnetic pole is equal to that of the core in the coil. Since it is approximately proportional to the cross-sectional area, it can be reduced, making high-frequency drive easier, and if the same impedance as before is allowed, then more coils can be wound, increasing recording and reproducing sensitivity. becomes possible. In particular, the magnetic head according to this embodiment is suitable for narrow track heads with narrow track widths.

As described above, according to the magnetic head according to the present invention, the main magnetic pole is sandwiched from both sides by the guard material blocks formed by the non-magnetic material portion that constitutes the magnetic medium contacting surface and the magnetic material portion that constitutes the auxiliary magnetic pole portion. This ensures sufficient mechanical strength, and the magnetic material part is divided into an auxiliary magnetic pole part that corresponds to the main magnetic pole and around which the coil is wound, and a return path part that serves as a return path for the magnetic flux of the main magnetic pole. Regeneration efficiency is greatly improved. It is clear that the magnetic head according to the present invention can produce similar effects even when applied to a multi-element magnetic head in which a plurality of main magnetic poles are arranged.

[Brief explanation of drawings]

Figures 1 and 2 are block diagrams of a perpendicular recording magnetic head, Figure 3 is an enlarged block diagram of a portion of Figure 2, Figure 4 is a conventional perpendicular recording magnetic head,
The figure is a process diagram of the manufacturing method of the magnetic head, Figure 6A is a front view of the joined state of the non-magnetic block and the magnetic plate block in the manufacturing process of the magnetic head, and Figure 6B is the same as Figure A. Partially enlarged front view, No. 7
8A is a front view of an example of the magnetic head according to the present invention, FIG. 8B is an enlarged perspective view of a portion of FIG. 10 is a partially omitted front view of the operating state of the magnetic head, FIG. 11A is a front view of another example of the magnetic head according to the present invention, and FIG. 11B is the same view A.
FIG. 12 is a process diagram of the manufacturing method of the magnetic head, FIG. 13 is a front view of yet another example of the magnetic head according to the present invention, and FIG. 14 is a non-magnetic material of the magnetic head. FIG. 15 is a perspective view of the main parts with some parts omitted, and is a process diagram of the manufacturing method of the magnetic head. In the figure, 22 is the main magnetic pole, 23 is a protective film, 24, 2
4' is a guard material block, 25, 25' are non-magnetic material parts, 26, 26' are magnetic material parts, 27, 27' are auxiliary magnetic pole parts, 28, 28' are return path parts, 29,
29' is a groove, and 4 is a coil.

Claims (1)

[Claims] 1 Consists of a main magnetic pole made of a thin layer of soft magnetic material and a pair of guard material blocks integrally bonded to sandwich the main magnetic pole from both sides, each of the guard material blocks extending from the surface in contact with the magnetic medium to a required position. An auxiliary magnetic pole is formed by combining an extending non-magnetic material part and a magnetic material part, and is magnetically joined to the main magnetic pole and becomes an auxiliary magnetic pole of a required width at the bonding interface between the non-magnetic material part and the magnetic material part. A magnetic head for perpendicular recording, in which a groove is formed to divide the main magnetic pole into a return path section and a return path section serving as a return path for the magnetic flux of the main magnetic pole, and a winding is applied to the main magnetic pole through the groove.