JPH02208807A - Magnetic head for perpendicular recording and reproduction - Google Patents

Abstract

PURPOSE:To prevent demagnetization, erasure, and recording and reproduction from being disturbed due to the outside leakage magnetic field of recorded magnetization information by employing such constitution that a soft magnetic material with a large volume is arranged at a position where a tip exposed to a medium confronting plane is not superposed on the tip of a main magnetic pole, or part of it is superposed in parallel in the neighborhood of the main magnetic pole. CONSTITUTION:The soft magnetic material 32 for magnetic field concentration whose tip 32a is exposed to the medium confronting plane is arranged via a nonmagnetic layer 33 in the thickness direction of the main magnetic pole 13. The tip 32a of the soft magnetic material 32 is formed in shape thinner that the thickness of another part and narrower than the width of the tip 13a of the main magnetic pole, and also, the material is arranged at the position where it is not superposed on the tip 13a of the main magnetic pole in the travel direction of the medium, or is superposed on its edge part in parallel. Therefore, the outside leakage magnetic field can be concentrated on the soft magnetic material 32 with the large volume. Thereby, the concentration of the outside leakage magnetic field on the main magnetic pole 13 can be blocked, and also, side erasure on the recording track of a perpendicular recording medium 21 can be performed by the leakage magnetic field from the tip of the soft magnetic material 32 on which the outside leakage magnetic filed is concentrated.

Description

[Detailed Description of the Invention] [Overview] [Industrial Application Field] The present invention relates to a perpendicular recording/reproducing magnetic head used in a perpendicular magnetic recording type magnetic tape device or the like.

In recent years, with the increase in the density of magnetic recording in magnetic tape devices, etc., a perpendicular magnetic recording system, which is theoretically more suitable for high-density recording than the conventionally used horizontal magnetic recording system, has been proposed, and is gaining popularity. However, there is a need for a head structure that can provide high output and good reproduction characteristics.

[Conventional technology]

Conventionally, for example, a fixed head type perpendicular recording/reproducing magnetic head used in, for example, a magnetic tape device is assembled with a recording/reproducing coil 14 on a non-magnetic substrate 12, as shown in a conceptual perspective view of main parts in FIG. A plurality of combined main magnetic poles 13 have their main magnetic pole tips 13a facing each other, for example, on a base film 2.
2, a high magnetic permeability soft magnetic layer (also referred to as an underlayer) 23 for magnetic flux return and a perpendicular recording layer 2 having perpendicular anisotropy.
Perpendicular magnetic recording tape medium 2 with a two-layer film structure in which 4 is laminated.
They are arranged so as to correspond to one plurality of recording tracks 21a, respectively.

A magnetic head 11 equipped with such a plurality of main magnetic poles 13
When recording information on each of the plurality of recording tracks 21a of the perpendicular magnetic recording tape medium 21 having the two-layer film structure facing each other, a signal current for recording is applied to each of the recording/reproducing coils 14 to The main magnetic pole 13 is magnetized, and the leakage magnetic field M from each main magnetic pole tip 13a passes perpendicularly through the perpendicular recording 124 in the plurality of recording tracks 21a of the tape medium 21 facing each other, as shown by the chain line in the figure, Recording is performed in a magnetization mode that passes horizontally through the soft magnetic layer 23 and returns vertically through the perpendicular recording layer 24 to return to the main magnetic pole 13. Each main magnetic pole 13 of the corresponding magnetic head 11 is magnetized by the leakage magnetic field from the perpendicular recording layer 24 in the recording track 21a, and at this time, the recorded information is reproduced by the signal voltage generated in each recording/reproducing coil 14. .

[Problem to be Solved by the Invention] However, in the perpendicular recording/reproducing magnetic head 11 having the above-described configuration, the leakage magnetic field M from the motor inside the magnetic tape device and the outside is as shown by the chain line in FIG. The leakage magnetic field that tends to concentrate on the main magnetic pole 13 leaks from the main magnetic pole tip 13a to demagnetize or erase the magnetization information of the perpendicular recording layer 24 in the plurality of recording tracks 21a of the opposing tape medium 21. There was a problem that the recording and reproducing of information was hindered.

Furthermore, when reproducing the recorded information on the tape medium 21, the recorded information of the recording track adjacent to the recording track to be reproduced by off-track and the writing blur of the recorded information of the adjacent recording track are also reproduced as noise. In order to solve this problem, as shown in FIG. 4, a guard band 21b having a width narrower than the width of the recording track 21a is provided between the respective recording tracks 21a. Although a non-magnetized area is provided, as the track density of such a magnetic tape medium 21 increases, the width of the guard band 21b naturally becomes narrower.
It has been difficult to reduce the side crosstalk as described above.

In view of the above-mentioned conventional problems, the present invention prevents external leakage magnetic fields from concentrating on the main magnetic pole, thereby preventing demagnetization, erasure, and recording/reproduction of recorded magnetized information caused by external leakage magnetic fields. Another object of the present invention is to provide a new magnetic head for perpendicular recording/reproduction which reduces side cross noise during reproduction.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a magnetic head that is combined with a recording/reproducing coil and is provided with one main pole such that its tip is exposed to the medium facing surface. A soft magnetic body for magnetic field concentration is disposed with its tip exposed to the medium facing surface through a non-magnetic layer in the horizontal direction, and the tip of the soft magnetic body is thinner than other parts;
It has a shape narrower than the width of the main pole tip, and is provided parallel to the main pole tip at a position that does not overlap in the medium running direction, or at a position where side edges overlap.

[For production]

In the present invention, a soft magnetic material having a large volume is disposed near the main magnetic pole in parallel so that the tip thereof exposed to the medium facing surface does not overlap with the tip of the main magnetic pole, or partially overlaps with the tip of the main magnetic pole. By doing so, the leakage magnetic field from the outside can be concentrated on the soft magnetic body with a large volume, so that the concentration of the external leakage magnetic field on the main magnetic pole as in the conventional case is prevented, and the concentration of the external leakage magnetic field is also reduced. The magnetic field leaking from the tip of the soft magnetic material causes side erase to the recording track of the perpendicular recording medium during recording and reproduction.
Erase) is performed, and the occurrence of side crosstalk noise due to off-track or writing blurring can also be reduced.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of a main part conceptually showing an embodiment of a magnetic head for perpendicular recording and reproducing according to the present invention, and FIG. 2 is a sectional view of the main part thereof, and the same parts as in FIG. is attached.

In this embodiment, comb-shaped Mn-Zn+ is formed on the non-magnetic substrate 12.
A large-volume soft magnetic body 32 made of Ni-Zn or the like is arranged, and sto,, AA z
A plurality of main magnetic poles 13 made of Ni--Fe or the like are arranged in combination with a recording/reproducing coil 14 as in the conventional case through a non-magnetic layer 33 made of oz. Here, according to the feature of this embodiment, each main pole tip 13a and each protruding end (tip) 32a of the soft magnetic body 32 are parallel to each other so that their side edges overlap in projection, as shown in FIG. It is arranged so as to be exposed to the medium facing surface.

Further, each protruding tip 32a of the soft magnetic body 32 has a thickness equal to the thickness of the main pole tip 13a, for example, 0.3 μ-
The width is about 0.2 μm, which is thinner than that, and the width is equal to the width of the main pole tip 13a, for example, 4 μm.
It is formed to have a diameter of about 150 to 200 μm, which is narrower than about 0.00 μm.

Therefore, the perpendicular recording/reproducing magnetic head 3 having such a configuration
1, each of the main magnetic pole tips 13a of 1 is formed of a base film 22 in which a high magnetic permeability soft magnetic layer (also referred to as a backing layer) 23 for magnetic flux return and a perpendicular recording layer 24 having perpendicular anisotropy are laminated on a base film 22, for example. If recording and reproducing are performed by arranging the perpendicular magnetic recording tape medium 21 with a layered film structure so as to correspond to a plurality of recording tracks 21a, the leakage magnetic field from an external motor etc. can be reduced as shown in FIG. The main magnetic pole 1 is not concentrated on each of the main magnetic poles 13 as shown by the chain line M in the figure.
The perpendicular magnetic recording layer 24 is concentrated in the soft magnetic material 32 having a larger volume than 3, and passes through the soft magnetic material 32 from the tip 32a of the perpendicular magnetic recording tape medium 21 between the recording tracks 21a of the opposing perpendicular magnetic recording tape medium 21. Since it passes through the soft magnetic layer 23, the information on the recording track 21a magnetized and recorded by each of the main magnetic poles 13 is not demagnetized or erased, nor does it interfere with recording and reproducing.

Furthermore, such concentration of the external leakage magnetic field on the main magnetic pole 13 is prevented, and as shown in FIG. Side erase is performed on the recording tracks 21a of the medium 21, and erase tracks 34 are formed between each recording track 21a, reducing the occurrence of side crosstalk noise due to off-track or writing blurring during recording and reproduction. It becomes possible to do so.

In addition, in the above embodiment, an example was explained in which a soft magnetic material for concentrating an external leakage magnetic field was placed near a plurality of main magnetic poles combined with a recording/reproducing coil. Alternatively, the same effect can be obtained by using a soft magnetic substrate as the substrate itself which becomes the slider for arranging the main magnetic pole and the like.

〔Effect of the invention〕

As is clear from the above description, according to the magnetic head for perpendicular recording and reproducing according to the present invention, concentration of external leakage magnetic field on the main pole is prevented, so information on the recording track can be demagnetized and erased. At the same time, side erasing is performed on the recording track due to the leakage magnetic field from the tip of the soft magnetic material provided to prevent this magnetic field concentration, so side crosstalk noise due to off-track or writing blurring is reduced. This has practical effects such as being able to stably obtain playback characteristics.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts conceptually showing an embodiment of the magnetic head for perpendicular recording and reproducing according to the present invention, and FIG. 2 shows the concentration of external leakage magnetic field on the magnetic head for perpendicular recording and reproducing shown in FIG. 3 is a plan view showing the relationship between the tip positions of the main pole and the soft magnetic material and the recording track in the magnetic head for perpendicular recording and reproducing according to the present invention; FIG. FIG. 5 is a perspective view of a main part conceptually showing an example of a magnetic head for perpendicular recording and reproducing. FIG. 5 is a diagram for explaining problems with the conventional magnetic head for perpendicular recording and reproducing. 1 to 3, 12 is a nonmagnetic substrate, 13 is a main pole, 13a is a main pole tip, 14 is a coil, 21 is a perpendicular magnetic tape medium, 21a is a recording track, 22 is a base film, and 23 is a soft 24 is a perpendicular recording layer, 31 is a perpendicular recording/reproducing magnetic head, 32 is a soft magnetic material, 32a is a tip of the soft magnetic material, 33 is a nonmagnetic layer, and 34 is an erase track. 3rd sentence, 2nd verse, Figure 4

Claims (1)

[Claims] In a magnetic head in which at least one main magnetic pole (13) combined with a recording/reproducing coil (14) is provided such that its tip (13a) is exposed to the medium facing surface, the thickness of the main magnetic pole (13) A soft magnetic body (32) for magnetic field concentration is disposed with its tip (32a) exposed to the medium facing surface through a nonmagnetic layer (33) in the direction, and the tip (32a) of the soft magnetic body (32) is thinner than other parts and has a shape narrower than the width of the main pole tip (13a), and is a position that does not overlap with the main pole tip (13a) in the medium running direction, or a position where the side edges overlap. A magnetic head for perpendicular recording and reproduction, characterized in that the head is provided parallel to the .