JPH03171406A - Head for perpendicular magnetic recording and reproducing - Google Patents

Abstract

PURPOSE:To prevent leak magnetic flux from being generated and to improve the reproduction efficiency by providing magnetic films for a return path which are made of magnetic films with high magnetic permeability at the part of a main magnetic pole part which faces the return path part of an auxiliary magnetic pole part. CONSTITUTION:A main magnetic pole film 7 is arranged at the center part of the main magnetic pole part 2 and a couple of magnetic films 11 for the return path are provided on both its dies opposite the return path part 5 of the auxiliary magnetic pole part 1. The magnetic films 11 for the return path are made of magnetic bodies with the high magnetic permeability and arranged in the same direction with the main magnetic pole film 7. A piece where the main magnetic pole film 7 is formed on one side 2a of the main magnetic pole part 2 and a piece where the couple of magnetic films 11 and 11 for the return path are formed on the other side 2b of the main magnetic pole 2 are adhered and this main magnetic pole part 2 is adhered to the top surface of an auxiliary magnetic pole part 1 where a coil 6 is mounted. Consequently, the head which has closed magnetic path structure is constituted and while magnetic flux is prevented effectively from leaking the main magnetic pole film part, the magnetic resistance is reduced, so the reproduction efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular magnetic recording/reproducing head for recording signals on a magnetic recording medium.

[Prior Art] The direct magnetic recording method has been known as a step toward increasing the density and capacity of magnetic recording devices.

Such perpendicular magnetic recording systems include those using a probe type head and those using a ring type head. Also, recently, one or more auxiliary magnetic poles are used as a so-called return path, and these are placed on the same medium surface side as the excitation type main pole using a coil to create a certain main pole excitation type single magnetic pole head. Using this head, a method was proposed for recording signals on a double-layered medium that combines a flat perpendicular magnetization film and a high permeability film (soft magnetic film), and excellent magnetic recording characteristics were obtained. ing.

Figures 3 and 4 show an example of a main pole excitation type single magnetic pole head used in such a force type, and this head is composed of an auxiliary magnetic pole part 1- and a main magnetic pole part 2. has been done. The auxiliary magnetic pole part 1 is made of a magnetic material, and on its upper surface (the joint with the main magnetic pole part 2), a central coil mounting part 4 and a return bus part 5 around it are formed by cross-shaped grooves 3. ing.

A coil 6 is wound around the coil mounting portion 4 .

On the other hand, the main magnetic pole part 2 is made of a non-magnetic material, and a main magnetic pole film 7 made of a high magnetic permeability magnetic film is provided in the central part of the split part facing the coil 6. .

In a head with such a structure, as shown in FIG. 5, the magnetic flux generated in the coil attachment part 4 is guided to the high magnetic permeability film 10 of the magnetic recording medium 8 via the main pole film 7, and the magnetic flux is sandwiched between them. By magnetizing the vertically magnetized film 9, a signal is recorded on the magnetic recording medium 8.

[Problems to be Solved by the Invention] As described above, in the conventional multigonal magnetic recording/reproducing head, a magnetic field with a multigonal quadratic component is generated from the main magnetic pole film 7, and a complete multigonal magnetization transition occurs in the medium 8''. It is possible to cause

However, the head has an open magnetic path structure in which only the main magnetic film 7 protrudes from the other return bus parts (7), and the return bus part 5 faces the medium 8 through the non-magnetic part of the main pole part 2. Therefore, during playback, the magnetic flux generated from the recorded medium 8 enters the main pole film 7 once, but all of it is not guided from the coil attachment part 4 to the return path part 5, but instead enters the main pole film 7. A magnetic flux leakage θ occurs from the middle.

Further, in the conventional head, the non-magnetic material of the main pole section between the return path section 5 and the medium 8 also serves as magnetoresistive. As a result, there was a problem in that the reproduction efficiency of the head decreased and only a small reproduction output could be obtained.

The present invention solves the problems of the prior art as described in 2.
It is an object of the present invention to provide a flat magnetic recording/reproducing head which prevents the occurrence of leakage magnetic flux θ in the main pole film portion and has excellent reproduction efficiency.

[Means for Solving the Problems] - In order to achieve the object L, the rectangular magnetic recording/reproducing head of the present invention has a high permeability structure in the part of the main pole part facing the return path part of the auxiliary pole part. A structural feature is that a return path magnetic film made of a magnetic film is provided.

[Function] In the present invention configured in this way, the return path provided from the high magnetic permeability film 10 on the medium 8 side to the main magnetic pole film 7, the auxiliary magnetic pole part 1, its return path part 5, and the main magnetic pole part 2 A head with a closed magnetic circuit structure than the conventional magnetic film is used, which effectively prevents magnetic flux from leaking from the main pole film, and at the same time reduces magnetic resistance, improving playback efficiency. 2 is now possible.

[Example] Hereinafter, an example of the present invention will be specifically described with reference to FIGS. 1 and 2. Incidentally, the same reference numerals are used for the same parts as in the prior art, and the description thereof will be omitted.

In this embodiment, the main magnetic pole film 7 is disposed in the center of the main magnetic pole part 2 which is divided into two parts, as in the prior art. A pair of return path magnetic films 11 are provided opposite the return path section 5 in the section 1 . The return path magnetic film 11 is made of a magnetic material with high magnetic permeability, and is arranged in the same direction as the main pole film 7.

To manufacture the head of this embodiment as described above, the bow main pole film 7 is formed on one side of one side 2a of the main pole part 2 which is divided into two parts, and the other part 2a of the main pole part 2 is divided into two parts.
A pair of return path magnetic films 11, 11 are formed on one side of b, and these magnetic films 7, 11, 11 are adhered to support the main magnetic pole part 2. Glue it to both sides of the magnetic pole part 1.

According to the head of this embodiment configured in this manner, the return path magnetic film 11.11 made of a high magnetic permeability magnetic material is disposed within the main pole portion 2 made of a nonmagnetic material. A continuous magnetic path is formed from the return path portion 7 of the magnetic pole portion 1 to the return path magnetic film 11.11. As a result, compared to conventional heads, the entire head has a closed magnetic circuit configuration, preventing leakage of magnetic flux in the middle of the main pole film 7, and at the same time, connecting the return path section and the high permeability film 10 on the medium 8 side. Since the distance between the two heads becomes shorter and the magnetic resistance is reduced, the reproduction efficiency of the head is improved and high reproduction output is possible. Furthermore, as in this embodiment, if the main magnetic pole part 2 is divided into two parts and the main magnetic pole film 7 and the return path magnetic films 11, 6 11 are formed separately in each part, the compatibility between the two parts can be improved. The shape can be changed freely to obtain the desired recording and playback characteristics.
It is also easy to manufacture.

In particular, as in this embodiment, the return path magnetic films 11.1
1 is also advantageous in that reproduction waveform distortion due to a pseudo gap does not occur even if the return path section and the medium 8 come into contact. That is, when the return path portion is placed close to the main magnetic pole film {=I, the return path portion and the main magnetic pole film form a ring head shape, forming a pseudo gap, causing distortion in the reproduced waveform.

However, by forming the return path section in the rack width direction as in this practical example, the width of the pseudo gap becomes equal to the main pole film thickness, and the influence of the pseudo gap on the reproduced waveform is reduced. It almost disappears.

[Other Embodiments] The present invention is not limited to the embodiments described in -1 and 2, and in manufacturing, the main magnetic frame film 7 and the return path magnetic film 11 are provided on one surface of the main magnetic pole portion 2. .11 can be formed in advance, or the main magnetic pole film 7 and the return path magnetic film 11.11 can be provided in advance on a film-like support.
It is also possible to support this between the main magnetic pole parts 2 which are divided into two parts.

[Initial effect] As described in 1-“, according to the present invention, a magnetic film for a return path is provided on the main magnetic pole portion made of a magnetic material, facing the return bus portion of the auxiliary magnetic pole portion. By this very simple means, it is possible to create a flat perpendicular magnetic recording head with high reproduction efficiency, no leakage magnetic flux in the middle of the main pole film, and little magnetic resistance.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of the perpendicular magnetic recording head of the present invention, FIG. 2 is a perspective view of the same in a completed state, FIG. This figure is a perspective view of the completed state, and FIG. 5 is a sectional view showing the state of magnetic flux in a conventional head. 1... Auxiliary magnetic pole part, 2... Main magnetic pole part, 3... Groove,
4... Coil attachment part, 5... Return path part, 6...
... Coil, 7... Main magnetic pole film, 8... Magnetic 9"c recording medium, 9... Perpendicular magnetization film, 10... High magnetic permeability film, 1 1,... Magnetic film for return path Foil 1 Figure JP-A-3 171406 (4)

Claims (1)

[Claims] An auxiliary magnetic pole part made of a magnetic material and having a coil attachment part and a return path part, and a main pole part made of a nonmagnetic material and made of a high permeability magnetic film facing the coil attachment part. Perpendicular magnetic recording characterized in that a main magnetic pole part provided with a magnetic pole film and a return path magnetic film made of a high magnetic permeability magnetic film are provided in a portion of the main magnetic pole part facing the return path part of an auxiliary magnetic pole part. play head.