JPS60211607A - Vertical magnetic head - Google Patents

Abstract

PURPOSE:To obtain a vertical magnetic head which is easily manufactured, excellent in the magnetizing efficiency, and improved in the recording sensitivity, by winding a coil around a projected part at the center of a high-magnetic permeability magnetic substance body which is magnetically coupled with one end of a main magnetic pole. CONSTITUTION:A main magnetic pole 10 of a soft magnetic thin film is held between base bodies 11a and 11b and a high-magnetic permeability magnetic substance block 30 worked to have a projecting shape is joined with them so that the block 30 can be connected magnetically with one end section of the main magnetic pole 10. A coil 20 for recording and reproducing is not wound around the main magnetic pole 10 but around a projected part at the center of the block 30. Therefore, the coil can be wound easily. Moreover, since no magnetic saturation takes place at the section beyond the front end of the main magnetic pole 10, this vertical magnetic head becomes excellent in magnetizing efficiency. As a result, the front end of the magnetic pole is intensely magnetized and the recording sensitivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a perpendicular magnetic head used in a perpendicular magnetic recording system, and more particularly to an improvement in the structure of a main pole excitation type single pole head.

[Prior art]

As is well known, the perpendicular magnetic recording method is a method that performs magnetic recording in the "thickness direction" of a recording medium such as a tape or disk. A reproducing head, that is, a perpendicular magnetic head, naturally requires a head with characteristics different from those of conventional magnetic heads. In other words, in a perpendicular magnetic head, a) since the recording medium has magnetic perpendicular anisotropy,
The distribution is sharp and a large perpendicular magnetic field can be generated to sufficiently magnetize it.

and b) It is possible to record on a recording medium with a small magnetomotive force, and to extract a large playback output from the recorded recording and medium.

is mainly required. It is also well known that the above-mentioned main pole excitation type single magnetic pole head has been proposed as one of the devices that satisfies such requirements. The basic configuration of this main magnetic pole excited single magnetic pole is shown in FIG.

In other words, as shown in FIG.
The main magnetic pole 1 is disposed so as to be in sliding contact with the magnetic layer of M (thread 1 line part in the figure), and the excitation coil 2 is wound around the main magnetic pole l. Na'i
A signal is recorded on the magnetic layer of the recording medium RM by the strong perpendicular magnetic field of the main magnetic pole 1 generated by excitation of the main magnetic pole 1 by flowing 4j, 1llf, and the main magnetic pole is 1 is magnetized, and an induced voltage corresponding to this magnetization is extracted from the excitation coil 2 to reproduce a signal.

However, this main pole excitation type single pole head is difficult to manufacture because it is necessary to wrap the coil 2 around the main pole 1 which is formed of a thin film (actually about 1 μm) as described above.

The coil winding portion of the main magnetic pole 1 is likely to be magnetically saturated, and the tip of the main magnetic pole 1 that comes into sliding contact with the recording medium RM cannot be strongly magnetized.

Due to such problems, it has not yet been put into practical use.

[Purpose of the invention]

An object of the present invention is to solve the above-mentioned disadvantages of the main pole excitation type single pole head, and to provide a perpendicular magnetic head that is easy to manufacture and has excellent magnetization efficiency at the tip of the main pole, and is suitable for practical use. .

[Structure of the invention]

In other words, in this invention, instead of directly winding a coil around a high magnetic permeability soft magnetic thin film serving as the main magnetic pole, a high magnetic permeability magnetic block processed into a tapered or convex shape is formed so that the end surface thereof is on one side of the soft magnetic thin film. A coil is wound around the tip of the magnetic block by joining the magnetic block so as to be magnetically coupled to the end thereof. Of course, the high magnetic permeability soft magnetic thin film serving as the main magnetic pole is held in advance by a suitable non-magnetic material so that it can be easily joined to the magnetic block. In addition, the winding part of the coil, that is, the tip of the magnetic material block mentioned above, can become magnetically saturated before the tip of the soft magnetic thin film that serves as the main pole. It disappears.

This means that the main pole tip is strongly magnetized. Of course, this also improves recording sensitivity.

In addition, if a high magnetic permeability magnetic block is further bonded in parallel with the soft magnetic thin film and connected to the nonmagnetic substrate and high magnetic permeability magnetic block, it is possible to further bond the magnetic layer of the recording medium. Since a so-called magnetic field loop is formed through the magnetic field, the recording/reproducing sensitivity is further improved. Of course, in this case, the high permeability magnetic blocks may be formed integrally.

〔Effect of the invention〕

As described above, the perpendicular magnetic head according to the present invention has a structure that is easy to manufacture and has excellent magnetic performance, and is capable of practical and highly sensitive perpendicular magnetic recording and reproducing.

〔Example〕

FIG. 2 shows an embodiment of the perpendicular magnetic head according to the present invention. However, in this embodiment head, the present invention is applied to a magnetic head of an apparatus using a burnable floppy disk as a perpendicular magnetic recording medium.

Now, in this embodiment head, the main magnetic pole 10 is made of a high permeability soft magnetic thin film such as Co-Zr or Ni-Fe, and the main magnetic pole 10 is made of a non-magnetic material such as lath or alumina titanium carbide. The bases 11a and 1lb, which are held in place, are connected to the floppy disk drive (not shown) through the IJ-drive wire 21.
A recording/reproducing coil 20 is electrically connected to the reading device, and the coil 20 is made of a high magnetic permeability magnetic material such as Mn-Zn ferrite and has a convex projection in the center thereof.
The block 30 is wound around the main magnetic pole 10 and the non-magnetic bases 11a and llb which are the holders thereof, respectively, as shown in the figure, to form a magnetic circuit as the magnetic head. Further, this magnetic circuit is integrally held by a slider made of a non-magnetic material such as Chitapari or alumina titanium carbide and processed as shown in the figure, so that at least the above-mentioned main magnetic The tip of 10
It is designed to allow good sliding contact with the second flow and P disk.

In this way, instead of winding the coil 20 directly around the main magnetic pole 10, the coil 20 is wound around the protrusion of the core of the high permeability magnetic block 30, which is magnetically coupled to the bottom end of the main magnetic pole 10. This fabrication becomes extremely easy.

Hereinafter, with reference to FIGS. 3 to 7, the fabricator 1 of the head according to the embodiment will be explained.

(2) One end of the base 11a made of a non-magnetic material such as glass or alumina titanium carbide as described above is polished to a mirror finish, and a Co-Zr or Ni-
A high magnetic permeability soft magnetic film such as Fe is formed on the non-magnetic substrate 11, and the formed soft magnetic film is further sandwiched between the non-magnetic substrates 11 and 11.
The same base body 11b as in a is glued and fixed (see FIG. 3).

2) High magnetic permeability magnetic block 3 such as Mn-Zn ferrite, which is part of the magnetic block 30 (see FIG. 2)
1 is processed so that its center part becomes convex as shown in FIG. 4, and the two are fixed with adhesive so that the tip surface of this protrusion is joined to one end of the soft magnetic film (main pole 10). .

3) As shown in FIG. 5, the coil 20 is wound around the protrusion of the magnetic block 31, and the lead wire 21 is pulled out.

4) High permeability magnetic blocks 32a and 32b, which are the same as the magnetic block 31, are joined to the same magnetic block 31 and the non-magnetic substrates 11a and llb in a manner parallel to the main magnetic pole 10, as shown in FIG. let

5) A non-magnetic material 41a such as chitapari or alumina titanium carbide is coated on the side surface of the magnetic circuit constructed in this manner, for example, in the manner shown in FIG.

41b, 42a, and 42b are joined to form the slider 40.
form.

6) Finally, the vertical length of the main magnetic pole IO is 100
This surface was integrally ground and polished to ~200μ7n, and the head surface was then wrapped and chamfered to ensure stable and smooth sliding contact with the disk surface as a magnetic head for proppy disks. Let's do it. Note that the length of the main magnetic pole 10 of 100 to 200 μm is a useful value for sufficiently magnetizing the tip of the coil 20, and if the length is still within this range, it is difficult to manufacture the same head. is also easy.

Through the above steps, the embodiment head as shown in FIG. 2 is completed.

The magnetic block 31 does not necessarily have to have a convex shape as shown in FIG.
Alternatively, as shown in FIG. 8, it may be processed into a suitable chieve shape. In short, it is only necessary that the tip portion joined to the main magnetic pole 10 has a shape that facilitates winding of the coil 20 and makes the magnetization of the main magnetic pole 10 by the coil 20 highly efficient. .

Further, as the magnetic block 30, a block previously processed into an E-shape as shown in FIG. 9 can also be used. In this case, the coil 20 is wound in advance around a winding frame, etc., and the wound coil is inserted into the protrusion of the center shaft of the block 30, and then the main magnetic pole 10 and the brackets that hold it are inserted. It is preferable to bond it to a block consisting of magnetic substrates 11a and 11b.

FIG. 10 schematically shows the functional aspect of the slider (the slider 40 is not shown) in the above-described embodiment.

That is, assuming that the magnetic layer of the recording medium RM has a two-layer structure consisting of a soft magnetic film layer made of Ni-Fe or the like and a perpendicularly magnetized film layer made of Co-Cr or the like, the recording by the same head When writing data to the medium RM or reading data from the recording medium RM, these magnetic layers and the above-mentioned main magnetic pole 10 and magnetic block 3 of the same head
0, a magnetic field loop as shown by the arrow in FIG. 10 is formed. As a result, the perpendicular magnetic film layer and the main magnetic pole 11j are strongly magnetized to each other.

As described above, the head of this embodiment not only facilitates the 11th operation, but is also effective in increasing the recording/reproducing sensitivity of the perpendicular magnetic recording apparatus. Further, the coil 20 is connected to a magnetic block magnetically coupled to the bottom end of the main magnetic pole 10;
0 by winding it around the central protrusion, the main (1
The fact that the magnetization efficiency at the tip of the eaves pole 10 is also improved is greater than 1.11 as described above.

Note that the portion of the magnetic block 30 that corresponds to block 32at or 32b in FIG. 6, for example, is
The effect can be obtained by simply providing it at least on the upstream side in the recording medium moving direction.

Further, even if the structure does not include the portions corresponding to the blocks 32a and 32b, the various problems conventionally associated with the above-mentioned main pole excitation type single magnetic pole head can be effectively solved.

[Brief explanation of drawings]

FIG. 1 is a side view showing the basic structure of a main pole excitation type single magnetic pole head, FIG. 2 is a perspective view showing the structure of an embodiment of the perpendicular magnetic head according to the present invention, and FIGS. FIGS. 8 and 9 are perspective views showing other shapes of the magnetic blocks used in the example head shown in FIG. 2; FIG. 10 is a diagram schematically showing the functions of the embodiment head shown in FIG. 2. 1.10...Main magnetic pole, 2,20...Coil, 11a
. 11b...Nonmagnetic base, 21...Coil lead wire,
30...High permeability magnetic material block, 40...Holder, RM...Engraving of recording medium drawing (no change in content) Figure 1 Figure 3 Figure 4-3C Figure 10 Director General of the Japan Patent Office 1. Indication of matter 1'1 1978: Patent Application No. 68232 2. Name for light use ii'j 田き1\ツI~ 3.7 ■ Relationship with positive event 1'F Special i1 applicant Tomigami Xerox Co., Ltd. 4, f (embedded

Claims (3)

[Claims] (1) A high permeability soft magnetic thin film held between non-magnetic substrates, and a high permeability soft magnetic thin film processed into a chi-shaped or 'convex shape and whose tip end surface is joined to one end of the high permeability soft magnetic thin film. A magnetic circuit includes a magnetic block of high magnetic permeability and a coil wound around the tip of the high permeability magnetic block.
Hil, to perpendicular magnetism characterized by what he did, de. (2) A high magnetic permeability soft magnetic thin film sandwiched between non-magnetic substrates, and a tip formed into a curved or convex shape and whose tip end surface is joined to one end of the high magnetic permeability soft magnetic thin film. a high magnetic permeability magnetic block m1; a coil wound around the tip of the high permeability magnetic block m1; and a coil wound around the tip of the high permeability magnetic block m1, and 1. A perpendicular magnetic head comprising a first high permeability magnetic material block and a second high permeability magnetic material block bonded to the first high permeability magnetic material block to form a magnetic circuit. (3) The perpendicular magnetic head according to claim (2), wherein the first and second high permeability magnetic blocks are integrally formed.