JPS60119610A - Single magnetic pole type magnetic head for vertical recording - Google Patents

Abstract

PURPOSE:To lower winding impedance per the same winding and to improve recording and reproducing sensitivity by winding coils around a main magnetic pole and the first and second nonmagnetic bodies without providing an auxiliary magnetic pole. CONSTITUTION:The main magnetic pole 2 is held between base plates 4a and 5a of the main magnetic pole of nonmagnetic guard materials 4, 5. The end part 2a which is in contact with a magnetic recording medium of the main magnetic pole 2 is formed thinner than the thickness of winding 2b by specified thickness. For instance, the thickness of a part 5mum from the contact face of the magnetic recording medium of the main magnetic pole 2 is made to 0.3mum, and the thickness of a part behind it is made to 4mum. A pad material 15 is made of a nonmagnetic material, and a protecting film 16 is made of an insulating film of SiO2, etc. Desirably, the nonmagnetic material 17 is compact and hard having a coefficient of thermal expansion rear to the magnetic material part 6. A notched part 20 is provided to bring a winding 14 as close as possible to contact face side. Other parts are constituted similarly to a conventional single magnetic pole type magnetic head for vertical recording.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a single-pole magnetic head for perpendicular recording, which performs magnetic recording by applying a perpendicular magnetic field to a magnetic recording medium having perpendicular anisotropy. It is.

BACKGROUND TECHNOLOGY AND PROBLEMS Recently, single-magnetism for perpendicular recording, as shown in Figure 1, has been developed, which performs high-density magnetic recording by applying a perpendicular magnetic field to a magnetic recording medium with perpendicular anisotropy. A head 111 is proposed. In this FIG. 1, (2) has a thickness of, for example, 0.
The main magnetic pole for recording and reproducing is made of 11M of soft magnetic material such as permalloy, sendust, magnetic amorphous, etc. with a diameter of 5 to 3μ. A protective film (3) is bonded to the negative side surface of the main magnetic pole for recording and reproducing (2). Konoho NII! (31 is an insulating image Wi film formed from 5i02+ Si3N+ +^1203 etc.) And these main magnetic poles (2
) and the protective film (3) are sandwiched from both sides by the non-magnetic guard material (41 (61) and the magnetic material part (6) (?).

Here, a magnetic recording medium contacting surface S is formed by the curved surfaces formed by the nonmagnetic guard materials (4) and (5). Further, the bonding interface S1 between the non-magnetic guard material (4) and the magnetic material part (6)
, the bonding interface S2 between the non-magnetic guard material (5) and the magnetic material portion (7) is inclined at a predetermined angle W4. Non-magnetic guard material (4
) and (5) are made of non-magnetic ferrite, forsterite, photoceram, crystallized glass, barium titanate, potassium titanate, AhOi T-coated ceramics, etc. In addition, the magnetic material part (6) and (
7) are formed of Mn-Zn-based ferrite, Ni-Zn-based ferrite, etc., and serve as auxiliary magnetic pole parts (8) and (9) that assist the main magnetic pole (2), respectively, and a return path for the magnetic flux of the main magnetic pole (2). the return bus portions O1 and (11), the groove portion (12a) dividing the auxiliary magnetic pole portion (8) and the return bus portion aφ;
), auxiliary magnetic pole part (9) and return bus part - (11)
It has 8 parts (t2b) to divide it into. here,
Non-magnetic guard material +41 +51 and magnetic material part (61 (71
It is desirable for the coefficient of thermal expansion to be similar to that in the manufacturing process of joining by glass fusion. Further, (13) indicates a magnetic recording medium having perpendicular anisotropy. This magnetic recording medium (1
3) is a high magnetic permeability layer (-13b) on a support (13a) made of a thermoplastic resin such as polyethylene terephthalate.
) and a perpendicular recording layer (13c) having perpendicular anisotropy are laminated in this order. Here, the perpendicular recording layer (13c) has magnetic anisotropy in the thickness direction of the magnetic recording medium (13), that is, in the perpendicular direction. Then, perpendicular recording is performed on this perpendicular recording layer (13c) by the perpendicular magnetic field from the main magnetic pole (2) described above. Further, the coil (14) is wound through the grooves (11) and (12) around the main pole (2) and the auxiliary pole part 17 (81), both of which are made of magnetic material. Perpendicular recording is performed by changing the perpendicular magnetic field in response to the excitation current flowing through the magnetic field.

In the single-pole magnetic head for perpendicular recording configured in this way, a magnetic recording medium having perpendicular anisotropy is formed from the tip of the main pole (2) in response to the excitation current flowing through the winding (14). A magnetic field is generated in a direction perpendicular to (13), resulting in perpendicular recording. Furthermore, the main magnetic pole (2) picks up the vertical magnetic field generated from the recorded magnetic recording medium, and a current corresponding to the change in magnetic flux passing through the main magnetic pole flows through the winding (14). A regeneration operation will be performed.

The conventional single-pole magnetic head for perpendicular recording configured in this way performs magnetic recording by applying a perpendicular magnetic field from the main pole (2) to a magnetic recording medium (13) having perpendicular anisotropy. Therefore, magnetic recording can be performed at a higher density than by the so-called longitudinal recording method in which recording is performed on a magnetic recording medium by magnetization in a direction along the direction of relative transition with respect to the direction of the magnetic head. This is thought to be due to the fact that the self-demagnetizing field in the magnetic layer becomes smaller as the wavelength of the recording signal becomes shorter than in the case of the longitudinal recording method. Furthermore, it has been demonstrated that the sensitivity is equivalent to or greater than that of a ring-type magnetic head based on the longitudinal recording method.

By the way, we considered narrowing the width of the trunk for recording on the magnetic recording medium (13) by this perpendicular recording single-pole magnetic head Tl). The reproduction voltage is the main magnetic pole (
2) It is proportional to the amount of magnetic flux flowing into the wire, and also proportional to the number of turns of the winding. By the way, during reproduction, the amount of magnetic flux flowing from the magnetic recording medium into the main magnetic pole (2) is proportional to the width of the recording track, so the magnetic flux passing through the main magnetic pole decreases. Further, the number of turns of the winding wire is determined because the impedance of the winding wire is determined by the necessity that the resonant frequency when connected to the device is higher than the upper limit frequency of use. That is, the number of turns depends on the impedance per unit number of turns. Mathematically, when the track width changes from Wl to W2, the reproduction voltage E per the same impedance is as follows, assuming that the impedance per number of turns changes from 21 to 22. Here, impedance Z1. Z2 is the number of turns 2
When comparing the reproduction sensitivity of magnetic heads, the winding impedance of a single magnetic pole head is proportional to the winding diameter and the winding, regardless of the track width. It is determined by the cross-sectional area of the magnetic member inside, for example, the ferrite core. On the other hand, in the case of a ring-type magnetic head, the winding impedance is determined approximately by the resistance of the magnetic recording medium in the gap portion and is therefore approximately proportional to the trunk width, and the reproduction voltage per same impedance is proportional to the square root of the track width. Therefore, in the case of a single-pole type magnetic head for perpendicular recording, when the trunk width is narrowed, the reproduction voltage at the same impedance decreases in proportion to the track width. There was a problem that the voltage decreased significantly.

In response to this problem, a single-pole magnetic head for perpendicular recording has been proposed, as shown in FIGS. 2 and 3, which has a narrow track and lowers the winding impedance. In FIGS. 2 and 3, parts corresponding to those in FIG. 1 are given the same reference numerals, and detailed explanation thereof will be omitted.

In this example, the length of the auxiliary magnetic pole part T81 (91) in the track width direction in the winding (14) in the example shown in FIG. The part is made of glass (8a) to supplement its strength (
9a). By doing this, the cross-sectional area of the auxiliary magnetic pole part (81 (91) in the winding can be reduced and the winding impedance can be lowered. However, since the width of the ferrite is narrowed by machining, the auxiliary magnetic pole part +81 (91) can be reduced.
There is naturally a limit to forming the auxiliary magnetic pole part +81 (91) narrowly due to the strength limit of the winding (14).
Since the diameter of the auxiliary magnetic pole parts (8) and (9) remains unchanged, the cross-sectional area of the auxiliary magnetic pole parts (8) and (9) becomes smaller, and the diameter of the winding remains large, so there is a limit to lowering the impedance.

Furthermore, as shown in FIG. 4, a single-pole magnetic head for perpendicular recording has been proposed in which the winding portion is constricted and concave in the track width direction to reduce the winding diameter. In this example (
15) (16) and (17) are glass materials. However, even with this configuration, the need to maintain the mechanical strength of the auxiliary magnetic pole section (81(9) above a predetermined value) imposes restrictions on making the winding section thinner.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned drawbacks, to provide a single-pole magnetic head for perpendicular recording, which can lower the winding impedance per number of turns and increase the recording and reproducing sensitivity.

Summary of the Invention The single-pole magnetic head for perpendicular recording of the present invention has a main magnetic pole whose one end facing the magnetic recording medium is formed thinner than the thickness of the winding, and first and second magnetic poles that hold the main magnetic pole from both sides of the main magnetic pole. It has a second non-magnetic material and a winding wound around the main pole and the first and second non-magnetic materials, which lowers the winding impedance per number of turns and improves recording and reproducing sensitivity. It is the one that raised the.

Embodiment Hereinafter, an embodiment of the single-pole magnetic head for perpendicular recording of the present invention will be described with reference to FIGS. 5 and 6. In these figures 5 and 6, figures 1, 2, 3
Portions corresponding to those in the figures and FIG. 4 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In Figure 5, (48) and (5a) indicate the main magnetic pole substrate portions of the non-magnetic guard materials (4) and (5), and the main magnetic pole substrate portions (4a) and (5a) form the main magnetic pole (2). so that it is held between the two. The main magnetic pole (2) is as shown in Figure 6.
The end portion (28) of the main pole (2) that faces the magnetic recording medium is formed to be thinner by a predetermined thickness than the thickness of the winding portion (2b). For example, the thickness of the portion of the main pole (2) from the surface facing the magnetic recording medium to the 5 μm fog is 0.3 μm, and the thickness of the portion behind it is 4 μm. (15) indicates a pillow material made of a non-magnetic material. Further, (16) indicates a protective plate made of an insulating film such as 5i02, and (17) indicates a non-magnetic member portion. This non-magnetic material portion (17) is preferably dense and hard, and desirably has a coefficient of thermal expansion close to that of the magnetic material portion (6). Also (20)
is a notch for bringing the winding (14) as close to the facing surface as possible. In addition, other parts are constructed in the same manner as a conventional single-pole magnetic head for perpendicular recording.

Next, an example of the manufacturing process of this embodiment will be explained with reference to FIGS. 7, 8, 9, 10, 11, and 12.

A first non-magnetic block (18) is prepared as shown in FIG. This 1@1 non-magnetic block (18) can be made of non-magnetic ferrite, Zn ferrite, forsterite, photoceram, crystallized glass, barium titanate, potassium titanate, ceramics such as Al2O3TiC threads, and the like. Moreover, this first non-magnetic block (18)
There are columnar protrusions (18a) (IBb) at predetermined intervals.
(18c) (18d) . . . form a column. These protrusions (18a) (18b) (18c) (18
d) For example, the width W3 in the front-rear direction of the row of protrusions in FIG. 7 is approximately equal to the trunk width on the width of the main pole (2). Further, (19) indicates a second non-magnetic block, and grooves (19a) are formed at predetermined intervals on the negative surface of this second non-magnetic block (19). These first and second
The surfaces of the non-magnetic blocks (18) and (19) to be bonded are polished to a smooth surface and the adhesive layer is made thin. Next, as shown in FIG. 8, after forming a cut (20) in the first non-magnetic block to bring the winding portion closer to the contact surface side, the first non-magnetic block (18) and the second and the non-magnetic block (19). For this bonding, an organic adhesive such as epoxy resin or an inorganic adhesive such as water glass can be used. Glass fusion bonding is desirable from the viewpoint of reliability of this bonding. Next, the base block (21) shown in FIG. 9 is obtained by cutting along the plane m shown in FIG. The cut surface of this basic block (21) is mirror polished. When performing this mirror polishing, the main pole substrate part (4a)
The main magnetic pole substrate portions (4a) and (5a) are formed as thin as mechanical strength allows, also in order to adjust the thickness t of the portion (5a). This is to make the winding diameter of the coil (14) as small as possible. In this case, since the substrates (4a) (5a) are made of a non-magnetic material, the main magnetic pole substrate parts (4a) (5a) are superior in strength to those made of magnetic materials. ) can be made thinner and can be easily processed. Here, the hole visible in the cut surface is for constricting the winding portion, and its width corresponds to the width w3 of the protrusion formed in the first non-magnetic guard material.

Next, an insulating protective film (not shown) is applied to the polished surface (21a) to a thickness of about 0.1 to 0.5 .mu.m. This insulating protective film is made of 51021 Si3N4+ Al2O3+ Zr
(H, etc.) to improve the magnetic properties of the soft magnetic thin film attached thereon.Next, as shown in Fig. The first main magnetic pole (22) reaches the medium contact surface
Add. The first main magnetic pole (22) has a high saturation magnetic flux density BS and a high magnetic permeability μ, and is formed of a soft magnetic thin film with particular emphasis on the quotient of the saturation magnetic flux density BS. Examples of this type of soft magnetic thin film include Sendust, Co-Zr,
Possible materials include an amorphous magnetic film such as Co-(NbZr), permalloy, and the like. This formation method uses a photoetching method to form stripes of a predetermined track width. Alternatively, a lift-off method may be used instead of the photo-etching method.

Here, the thickness of the first main magnetic pole (22) depends on the required resolution, and is 0.05 to 2 pta, main magnetic pole, 0.
．． 1-0.5μ- is used. Next, the magnetic recording medium (
13) From the position where the contact surface will be formed at the time of completion, a few μm ~ l
Oμ - A second main magnetic pole (23) is attached on the first main magnetic pole (22) rearward from the retreated position, for example, by a lift-off method. This second main magnetic pole (23) is made of a material with a large saturation magnetic flux density Bs and a high magnetic permeability μ, particularly a high magnetic permeability p.

Further, the width of the second main magnetic pole (23) is the same as that of the first main magnetic pole (22).
) is suitable for improving recording and reproducing sensitivity. The thickness of the second main pole (23) is approximately 2 to 10 μm. Both magnetic films have magnetic anisotropy in the track width direction and are formed by, for example, annealing in a magnetic field, sputtering in a magnetic field, vapor deposition, etc. so that the axis of easy magnetization is in the track width direction.

This is because if the axis of difficult magnetization is set in the direction in which the magnetic flux passes, Barkhausen noise during reproduction can be prevented and the frequency characteristics of the magnetic permeability μ can be improved. Since it is sufficient that the direction of the axis of difficult magnetization is the direction in which magnetic flux passes, the axis of easy magnetization may be oriented in the thickness direction. A structure with return buses on both sides may be used, but since the part (24) that becomes the substrate (4a) or (5a) on which the main pole film is attached is made of a non-magnetic material, sputtering, vapor deposition, and ion blating in a magnetic field are possible. , plating, etc. can be done easily.

Furthermore, since it is made of a non-magnetic material, there is no possibility that disturbance of the magnetic field will cause an adverse effect. Next, 5i021 yellow,
Si3N4g1n Al2O31Q! l ZrO2 film, etc. is attached to flatten the surface.The foundation block on the opposite side corresponds to Fig. 9, with the non-magnetic material block (19) in Fig. 7 being formed from a magnetic material block (19'). Form in the same way up to the part to be removed. Then, the block formed as shown in Fig. 11 and the constricted part are aligned and joined as shown in Fig. 12, the sliding surface S is formed by cylindrical polishing, and the cut surface n is formed on each head. Cut the wire at
14) to obtain the single-pole magnetic head for perpendicular recording shown in FIG.

Next, with reference to FIGS. 13 and 14, the recording and reproducing performance of the perpendicular recording single pole magnetic head of this embodiment will be discussed. Figure 13 is an example of calculating the magnetic flux density in the main magnetic pole (2), and shows the magnetic flux density at each part of the main magnetic pole (2) when a magnetic flux density of 5000 Gauss is generated at the tip of the main magnetic pole (2). . The magnetic field required for recording is approximately Hc + 4x M5, where the coercive force of the magnetic recording medium is Hc and the saturation magnetization is Ms.
Therefore, at least 5000 to 60000e is required. In this Figure 13, graphs (26) (27)
(2B) and (29) are the main pole (2) tip 5, respectively.
The thickness of the part up to the μm is 0.3 μm, and the thicknesses of the parts behind it are sequentially 0.3 μm, 1 μm, 2 μm, and 4 μm. The magnetic flux density in the thicker part is smaller. As can be seen from Fig. 13, when the thickness of the main magnetic pole (2) is constant and 0.3 μm, the magnetic flux density in the rolled magnetic pole (2) near the coil is high, reaching a maximum of about 20,000 Gauss. It has become. In this calculation, magnetic saturation does not occur because the calculation is linear, but in reality, the saturation magnetic flux of currently available high magnetic permeability films is about 15,000 Gauss at most, so the coil (14) At close to ■S minutes, magnetic saturation will be complete. On the other hand, if the rear part of the main magnetic pole (2) is made thicker, for example, the main magnetic pole (2)
If the diameter is 1 μm, which is about three times that of the tip, the magnetic flux density will drop to about 5,700 Gauss. In this case, as shown in the graph, the location where the magnetic flux density is highest is the part where the main magnetic pole (2) is just about to become thicker. Thus, it can be confirmed that for magnetic recording, it is sufficient to make the thickness of the rear part of the main pole three times that of the tip part. Further, when the thickness is further increased, the recording sensitivity is improved.

Next, with reference to FIG. 14, the thickness of the main pole for highly sensitive reproduction with a single pole type magnetic head for perpendicular recording will be discussed. The magnetic permeability of the soft magnetic S' gland is approximately several thousand at most in the MHz band. Therefore, magnetic permeability μ=2000.5
000, the relationship between the thickness of the rear main pole film and the reproduction efficiency will be investigated. Here, the regeneration efficiency is taken as the ratio of the magnetic flux linked to the winding (14) out of the magnetic flux flowing in from the tip of the main pole. In FIG. 15, the horizontal axis represents the thickness behind the main magnetic pole (2), and the vertical axis represents the regeneration efficiency of the main magnetic pole (2). (3
0) shows a graph for the magnetic permeability μ-5000 of the main magnetic pole (2), and (31) shows a graph for the magnetic permeability 2000 of the main magnetic pole. In both graphs (3o) and (31), the thickness of the tip 5μ of the symbiotic magnetic pole (2) is 0.3μ. It can be seen from this graph that in order to reproduce with high sensitivity, it is preferable that the thickness of the rear part of the main magnetic pole be approximately 3 to 4 microns.

In this way, in the perpendicular recording single-pole magnetic head of this embodiment, the magnetic pole part in the winding (14) is made of only a soft magnetic thin film, so it is different from the conventional auxiliary magnetic pole part (81) made of magnetic ferrite, for example. (Compared to the single-pole magnetic head for perpendicular recording having 91, it has the following effects.

(2) Even if the cross-sectional area of the magnetic pole portion is small, there is an advantage that it can be made into a single-pole magnetic head for perpendicular recording with high recording and reproducing sensitivity.

This is because the magnetic ferrite that conventionally formed the auxiliary magnetic pole part +81 (91) has a saturation magnetic flux density Bs = 5000 Gauss and a magnetic permeability u -1000 (5 MHz) or less, whereas a soft magnetic thin film has a saturation magnetic flux density B s = 150
00 Gauss, permeability p = 3000~5000 (5M
This is due to the presence of materials such as l1z).

■ A single magnetic pole type magnetic throat for perpendicular recording that can record and reproduce with high accuracy and narrow track width is obtained. If there is an auxiliary pole part made of magnetic ferrite as in the past, it requires mechanical processing, so there is a limit to reducing the cross-sectional area of the winding in terms of processing accuracy and mechanical strength.In this embodiment, spatter etc. Since the magnetic portion of only the main pole can be formed using the thin film fabrication process and the photoetching process, the thickness and width can be easily controlled to A1 accuracy, allowing excellent magnetic recording and reproduction with a narrow track width. However, this soft magnetic thin film is made thicker at a position slightly set back from the surface facing the magnetic recording medium, as shown in FIG. 6. This results in
With a uniform film thickness, perpendicular recording and reproducing can be performed satisfactorily without causing magnetic saturation, unlike when the film is made thinner by increasing the reproducing resolution.

■ Main pole board part (4a) (5a) inside winding (14)
) is made of a non-magnetic material, which has better mechanical strength and workability than magnetic materials, and the main pole substrate parts (4a) and (5a) can be formed with a small cross-sectional area, making it possible to reduce the diameter of the winding (14). This also allows the winding impedance to be lowered.

In this way, it is particularly useful for perpendicular recording single-pole magnetic heads for narrow tracks, where it is very important to reduce the winding impedance and to facilitate the processing of narrow tracks. be.

Further, FIG. 15 shows another embodiment of the present invention. This first
In FIG. 5, parts corresponding to those in FIGS. 1, 5, and 6 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, the bonding interface S1°S between the non-magnetic guard materials (4) and (5), the magnetic material part (6') and the non-magnetic material part (17)
2 is set back from a plane perpendicular to the main pole and the tip of the main pole to the side away from the surface facing the magnetic recording medium. The other parts are formed in the same manner as in the above embodiment. From the standpoint of recording and reproducing efficiency, it is preferable to wind the winding (14) as close to the tip as possible. In order to bring the winding (14) to the tip, the thickness of the non-magnetic guard material (4) (5) at the top of the winding groove (12a) (12b) must be made thinner. . In this case, since the magnetic recording medium contacting surface S is formed in a substantially cylindrical shape, the joining surface S be. In this way, by slanting the joining surfaces 31 and 32 and making the thickness of the upper part approximately uniform or thicker at both ends, the non-magnetic guard material (4) (5) is made as a whole.
) can be made thinner and the winding (14) can be placed at the tip, improving recording and reproducing sensitivity. In addition, in the manufacturing of this example, the protrusions (18a) (18b) are
... After forming the groove (19a) at a predetermined angle of about 1, it is glued as shown in Fig. 17, and the process is partially changed to the step of cutting at a predetermined interval at a slope at the cutting surface m1. . According to this example, the same effects as those of the above embodiment can be obtained, and there is an advantage that the main pole tip Lm can be shortened and the recording and reproducing efficiency can be improved.

Moreover, the main magnetic pole (2) of one embodiment of the present invention shown in FIG.
Regarding the formation of
It is also possible to attach the main magnetic pole (22) at a predetermined position on the non-magnetic block (19) and the second main magnetic pole (23) at a predetermined position on the magnetic block (19'). In this way, since the first main pole (22) is on the non-magnetic material, it can be well attached by sputtering in a magnetic field. When the main pole (22) is attached by sputtering in a magnetic field, the
There is an advantage that the main magnetic pole can be made without Barkhausen noise even when the S test is less than μm. Further, the second main magnetic pole (23) is attached onto the magnetic block (19) by heat treatment, as shown in FIG. Note that the film is thick enough to prevent Barkhausen noise, so the second main pole (
23) does not particularly require sputtering in a magnetic field. Here, the main magnetic pole 1* (22) may be formed into a stripe shape equal to the trunk width W1, and may be widened at a position slightly set back from the tip, but since there is a thick main magnetic pole film (23), it is not necessary to make it particularly wide. No, and the width W2 of the main pole (23)
It is desirable that Wl be equal to or slightly wider than Wl. The part below the winding part may be attached to the entire surface as shown in the figure, but since thick metal films generally tend to have weak adhesive strength, the part that will be at the end when cut into individual heads is fine. There is also a method of removing it by etching and increasing the adhesive strength with a non-magnetic pillow material (metal oxide, nitride, etc.).Although not shown, a protective film is attached, and after flattening, heat treatment is performed to bond the two. There is also a way to make it into a head. In this way, a head having a two-layered main magnetic pole can be manufactured using materials subjected to different heat treatment conditions.

FIG. 20 depicts another embodiment of the invention. In this example, three single-pole magnetic heads for perpendicular recording are combined to form a so-called tunnel erase type magnetic head.

As shown in Fig. 21, a main pole film (2) is formed on a magnetic material part (6) made of magnetic ferrite and a non-magnetic composite substrate (4a).
A protective film is applied to the track so that it has a predetermined track width and spacing, and then a protective film is applied. After forming grooves that will become the winding space, a non-magnetic block (3) that will become the inter-channel spacer (32) is
3) are joined and cut at the cutting surface m2 to make a block with a spacer. The main magnetic pole film is placed on the composite substrate in the same way!
! A block with a film attached is made, the main pole is placed in a predetermined position, the blocks are joined together, the opposing surfaces are polished, the heads are cut into individual heads, and the blocks are wound. Note that in this head, since the winding portions do not face each other but alternate, winding is possible even if the distance W3 between the main poles on the recording side and the tunnel erase side is narrowed. FIG. 22 shows another embodiment of the invention. The non-magnetic material near the main pole of the surface facing the magnetic recording medium is made of a harder material than the material on the outside, and the shape of the contact surface is slightly protruded only near the main pole to improve contact characteristics. As shown in Fig. 23, the manufacturing process involves preparing a non-magnetic block (18) with grooves (32) and mirror-finished opposing surfaces, and a rectangular bar-shaped non-magnetic material (33).
1 (32). At this time, the non-magnetic material (33
) is harder than the non-magnetic block (18) and wears out ((,s
choose something. The surface (33a) of the non-magnetic material (33) is made into a mirror surface, and the subsequent steps are exactly the same as those in the example shown in FIG. 5, for example. Since the area near the main magnetic pole is hard and the outer side is softer, when the opposing surfaces are polished, only the area near the main magnetic pole protrudes slightly into the shape shown in FIG. 22, which improves the contact with the recording medium. At this time, it is necessary to use a hard protective film for the main pole as well as the nonmagnetic substrates (4') and (5'). Since the main pole is made of metal, it is easily worn out, but since it is actually very thin, the main pole part will not be dented due to wear. In this example, there is also the advantage that the contact between the head and throat of the magnetic recording medium can be improved.

FIG. 24 shows another embodiment of the invention. In this embodiment, the magnetic ferrite is wound around the wire (14) on the magnetic material part (6) side.
Since the winding impedance increases when the winding impedance is close to the magnetic flux, a non-magnetic material (34) such as glass is placed at the bottom of the groove (12a) to block the magnetic flux and suppress the increase in the winding impedance. .

The other parts are formed in the same manner as in the above embodiment.

In order to provide this non-magnetic material (34), the non-magnetic guard material (
18) and the magnetic material part (19') by glass fusing or the like, or at the same time as the glass fusing, as shown in FIG. A step of forming a layer is added to the manufacturing process of the above embodiment. In this example as well, the winding (14)
It is easy to understand that recording and reproducing efficiency can be improved by lowering the impedance.

Moreover, this non-magnetic material part is wound as shown in FIG.
It is also possible to form the non-magnetic material portion (36) with an angular cross-section so as to cover the entire portion where the magnetic material portion 4) and the magnetic material portion (6) face each other.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations may be adopted without departing from the gist of the present invention.

Effects of the Invention According to the present invention, there is provided a main magnetic pole whose one end facing the magnetic recording medium is formed to be thinner than the thickness of the winding portion, and first and second non-magnetic materials that hold the main magnetic pole from both sides of the main magnetic pole. Since the coil is wound around the main pole and the first and second non-magnetic materials by -4° without providing an auxiliary magnetic pole part, it can be used in a single-pole magnetic head for perpendicular recording. This has the advantage of lowering the winding impedance per winding and improving recording and reproducing sensitivity.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional single-pole magnetic head for perpendicular recording, FIG. 2 is a cross-sectional view showing another example of a conventional single-pole magnetic head for perpendicular recording, and FIG. FIG. 4 is a diagram showing an example of a conventional single-pole magnetic head for perpendicular recording, and FIG. 5 is a diagram for explaining the main parts of the example shown in the figure. A perspective view showing one embodiment, wA
Figure 6 is a sectional view of the example shown in Figure 5, Figures 7, 8, and 9.
Figures 10, 11, and 12 are diagrams showing an example of the manufacturing process of the example shown in Figure 5, and Figures 13 and 14 are diagrams explaining the example shown in Figure 5. , FIG. 15 is a perspective view of another embodiment of the single-pole magnetic head for perpendicular recording of the present invention, and FIGS. 16 and 17 are diagrammatic views of an example of the manufacturing process of the example shown in FIG. 15. , FIGS. 18 and 19 are diagrams showing examples of other manufacturing processes of the present invention, FIGS. 20, 22, and 24.
26 and 26 are diagrams showing other embodiments of the present invention, respectively, and FIGS. 21, 2311, and 25 are diagrams 20
2 is a line 1 showing an example of a main part of the manufacturing process of the example shown in the figure, the example shown in FIG. 22, and the example shown in FIG. 24. (2) is the main pole, (2a) is the end of the main pole, (2b) is the winding part of the main pole, (4) and 5) are non-magnetic guard materials,
(4a) and (5a) are main pole substrate portions made of non-magnetic guard material, and (14) is a winding. Fig.14

Claims (1)

[Claims] a main magnetic pole whose one end facing the magnetic recording medium is formed to be thinner than the thickness of the winding portion; first and second non-magnetic materials that hold the main magnetic pole from both sides of the main magnetic pole; 1. A single-pole magnetic head for perpendicular recording, comprising a first and a second non-magnetic material and a winding wound around the first and second non-magnetic materials.