JPH063641B2 - Head for perpendicular magnetic recording - Google Patents

Description

The present invention relates to a perpendicular magnetic recording head for recording / reproducing on / from a perpendicular magnetic recording medium.

<Prior Art> As an example of a magnetic head for recording on a perpendicular magnetic recording medium 6 composed of two layers of a perpendicular recording layer 4 and a high magnetic permeability layer 5 as shown in FIG. A main magnetic pole excitation type head has been used in which a thin film 2 made of a magnetically permeable material is additionally provided and a coil 3 is wound around a yoke 1.

Recording is performed by bringing the thin film 2 of the head into contact with the perpendicular magnetic recording medium and passing a signal current through the coil 3. At this time, due to the magnetic interaction generated between the thin film 2 and the high magnetic permeability layer 5, a strong recording magnetic field is generated in a direction perpendicular to the perpendicular magnetic recording medium 6 and sufficient magnetization is achieved for high density recording. I was getting the ability.

<Problems to be Solved by the Invention> However, the main magnetic pole excitation type head is basically an open magnetic path structure and has poor reproduction sensitivity. On the other hand, the ring head is used for perpendicular magnetic recording, but the ring head is originally closed magnetic field. Since it has a path structure, it has an advantage of high reproduction sensitivity, but it cannot generate a strong magnetic field in the perpendicular direction at the time of recording, and has a drawback that the medium has poor magnetizing ability.

<Means for Solving Problems> In the present invention, a thin film 2 made of a high magnetic permeability material is attached to the tip of a yoke 1 made of a magnetic material such as ferrite, as shown in FIG. Then, in the magnetic head in which the coil 2 is wound around the yoke 1, the yoke 1 is U-shaped, the thin films 2 are attached to both ends of the yoke 1, and two tracks having opposite polarities are formed on the perpendicular magnetic recording medium 6. A perpendicular magnetic recording / reproducing head capable of recording and reproducing.

<Operation> Not only is the high magnetic permeability layer 5 of the perpendicular magnetic recording medium 6 magnetically short-circuited at the tip of the yoke 1 to form a magnetic switching path, but also the magnetic medium is present in the magnetic circuit, so that the magnetization efficiency is improved. Good.

<Embodiment> As shown in FIG. 1, an embodiment of the perpendicular magnetic recording head according to the present invention has a U-shaped yoke 1 made of ferrite at both ends thereof.
It is formed by additionally providing a thin film 2 made of a high magnetic permeability material made of Co-Zr-Nb and winding a coil 3 around a yoke 1. The perpendicular magnetic recording head is brought into contact with the perpendicular magnetic recording medium 6 composed of the perpendicular recording layer 4 and the high magnetic permeability layer 5 and run in the direction of arrow 7. At this time, the high-permeability layer 5 is a single-pole recording / reproducing magnetic head as shown in the figure, but the open end of the yoke 1 is magnetically short-circuited to form a closed magnetic circuit structure and a high recording / reproducing effect is obtained.

In another embodiment according to the present invention, as shown in FIG. 2, a slider 8 made of ceramic or the like is attached to the tip of the yoke 1 by sandwiching both sides of the high magnetic permeability thin film 2 to wear the high magnetic permeability thin film 2. To reduce.

Further, since the perpendicular magnetic recording head according to the present invention is in contact with the perpendicular magnetic recording medium 6 at two points, two sets of tracks having opposite polarities are simultaneously recorded and reproduced.

Here, the results obtained by measuring the perpendicular magnetic recording heads according to the present invention and the conventional main magnetic pole excitation type head with the recording density on the abscissa recorded and reproduced on the perpendicular magnetic recording medium 6 as the output on the ordinate are shown. It is shown in FIG. As is clear from the figure, it is possible to increase the regeneration efficiency by a factor of 2 without particularly impairing the characteristics.

<Advantages of the Invention> As described above, according to the present invention, a perpendicular magnetic recording head having high reproducing efficiency and recording / reproducing two tracks having opposite polarities on the perpendicular magnetic recording medium 6 is provided. can get.

[Brief description of drawings]

FIG. 1 is a block diagram showing the outline of the structure of an embodiment of a perpendicular magnetic recording head of the present invention. (A) is an external perspective view, (b) is a side view, (c) is a front view, and FIG. Is another embodiment of the present invention, (a) is a side view, (b) is a front view, and FIG. 3 shows the relationship between the frequency and the recording / reproducing output of the perpendicular magnetic recording head of the present invention and the conventional one. FIG. 4 is a characteristic curve diagram shown in FIG. 4, which is a side view of a main magnetic pole excitation type head as an example of a conventional perpendicular magnetic recording head. In addition, 1: yoke, 2: thin film, 3: coil, 4: vertical recording layer,
5: high magnetic permeability layer, 6: perpendicular magnetic recording medium, 8: slider.

Claims (1)

[Claims] 1. A perpendicular magnetic recording head in which a thin film made of a high-permeability material is attached to the tip of a yoke made of a magnetic material around which a coil is wound, and the yoke is U-shaped and the thin films are formed at both ends. A perpendicular magnetic recording head characterized in that two tracks having opposite polarities are additionally recorded on and reproduced from the medium for perpendicular magnetic recording.