JPS6040511A - Vertical recording magnetic head - Google Patents

Abstract

PURPOSE:To write and read the vertical magnetic record with high density through a simple constitution by forming a magnetic thin film on a surface having a contact with a recording medium of a magnetic head and at the same time a read gap having small width at a position where the read gap overlaps a write gap of a magnetic thin film. CONSTITUTION:A magnetic thin film 8 is formed on a surface 7 having a contact with a recording medium 6 of a magnetic head; while a read gap 9 having smaller width than a gap 4 is formed at a position where both gaps 9 and 4 overlap to each other. The width lW of the gap 4 is larger than the thickness (d) of the medium 6; while the width lR of the gap 9 is smaller than the minimum inversion width of the magnetic record. A magnetic flux shown by arrows A is produced by supplying a current to a coil 3 to increase the current value and then saturate magnetically the film 8. Then the vertical magnetic recording is possible with high density since the component is comparatively large in the direction vertical to a magnetic surface 6a of the medium 6. Furthermore the magnetic record of high density can be read out since the width of the gap 9 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a perpendicular recording magnetic head that is capable of simply writing and reading data at high recording density.

Fig. 1 shows an example of a conventional ring-shaped magnetic head, where 1 is a ferrite core, 2 is a head yoke also made of ferrite, 3 is a coil, and 4 is between the herad core 1 and head yoke 2. The formed gap, 5, is glass filled in the gap 4, and 6 is a perpendicular recording medium having magnetic anisotropy in a direction perpendicular to the magnetic surface 6a. Gap width t
1 is larger than the thickness d of the medium 6, as shown in FIG.
In a), due to the component of the magnetic flux of the magnetic head in the direction perpendicular to the magnetic surface 6a, indicated by the arcuate arrow ■, as shown in FIG.
), relatively high-density perpendicular recording is possible. However, the gap width is 1. is the minimum reversal interval t for magnetic recording
Since it is more than twice F, the perpendicular recording shown in FIG. 1 (1) cannot be read by the magnetic head.

FIG. 2 shows a ring-shaped magnetic head in which the gap width t2 is approximately equal to the thickness d of the medium 6, and the magnetic flux of the magnetic head is directed perpendicularly to the magnetic surface 6a of the medium 6, as indicated by the arcuate arrow @. It is clear that the component is smaller than that in FIG. 1(a) and is limited to the surface layer of the medium 6, making it impossible to perform sufficient perpendicular recording.

Therefore, in order to realize perpendicular recording with a conventional ring-shaped magnetic head, two magnetic heads are required: a ring-shaped magnetic head with a large gap for writing, and a ring-shaped magnetic head with a small gap for reading. 2
There are complications such as the need to correctly set the arrangement of each magnetic head.

In order to eliminate these drawbacks, the present invention forms a magnetic thin film on the head surface including the write gap of the magnetic head.
The position overlapping the gap (where the second readout gap is formed, will be described in detail with reference to the drawings below).

FIG. 3(a) (+)IrJ shows an embodiment of the present invention, in which the same components as those of the conventional example are denoted by the same reference numerals. That is, 1 is Herad core, 2 is head yoke,
3 is a coil, 41 writing, main gap, 5 is glass, and 6 is a perpendicular recording medium. It is composed of a head core 1, a head yoke 2, and a glass 5: ri 1 includes a gap 4 for immediate writing, and a gap 7 in contact with a medium 6 has a nozzle ξ.
- A magnetic thin film 8 such as Malloy is formed by vapor deposition or the like, and a read gap 9 having a narrower gap width than the gap 4 is formed in the magnetic thin film 8 at a position overlapping the gap 4 using a laser beam or the like. Here gap 40 width t
It is assumed that y is larger than the thickness d of the perpendicular recording medium 6, and the width of the gear horn '9 is smaller than the minimum reversal interval tF of the magnetic field.

In the above magnetic head, when a current is passed through the coil 3,
When the current value is small, most of the magnetic flux is transferred to the Herad core 1. Magnetic wail8. The current flows through the head yoke 2, but when the current value is increased, the magnetic thin film 8 becomes magnetically saturated, and the magnetic flux φ shown by the arrow
produces W.

Similar to the magnetic flux of the magnetic head shown in FIG. 1, the magnetic flux φW has a relatively large component in a direction perpendicular to the magnetic surface 6a of the medium 6, so that high-density perpendicular magnetic recording is possible. Reading of perpendicular magnetic recording is performed by a gap 9 formed in the magnetic thin film 8, and the length of the gap 9 can be made as small as possible regardless of the size of the gap 4.

It is possible to read high-density perpendicular magnetic recording with a minimum reversal interval of .fl equivalent to the minimum processable gap width, and therefore it is possible to write and read high-density IJ'' with a single solid head. Incidentally, the thickness of the magnetic thin film 8 is generally sufficient to be about the minimum reversal interval t4r or tf.

FIG. 4 shows another embodiment of the present invention, in which an example suitable for a flexible disk device or the like that performs perpendicular recording on both sides of the medium is shown.

That is, in the figure, 10 is a slider part, 11 is a core support part,
These are both made of ceramic and are bonded to the head yoke 2 and the head core 1 through glass 2, respectively. Further, the surfaces of the slider section 10 and the core support section 11 that come into contact with the recording medium have Herad cores 1. Similar to the head yoke 2 and the like, an @-type thin film 8 is provided. The magnetic head having such a configuration is defeated by a head load arm (not shown) via the slider part 10 and the core support part 11, and is connected to other magnetic heads having the same configuration, the gaps 4 and 9, and the slider part 10. They are used by being arranged in opposite directions so that they face each other with the recording medium in between and press against each other.

According to the above magnetic head, since the writing gap 4 and the reading gap 9 are located at the same position, the number of parts can be reduced compared to the case where two conventional magnetic heads for writing and reading are used. Of course, the configuration can be simplified, and the head position control during writing and reading can be performed in exactly the same way, that is, as when writing and reading data with one magnetic head. I can do it. Here, since the distance between the slider section 10 and the helad yoke 2 is much wider than the gap of 4°9, even if the magnetic thin film 8 is provided on the slider section 10, there will be no inconvenience in writing or reading magnetic recording. Does not occur. In addition,
Other configurations and effects are the same as those of the previous embodiment.

As described above, according to the present invention, a magnetic thin film is formed on the surface of the magnetic head that includes the writing gap and is in contact with the recording medium, and a readout film with a narrow gap width is formed on the magnetic thin film at a position overlapping the gap. Because a gap was formed, 1
It is possible to write and read high-density perpendicular magnetic recording with a single magnetic head, reduce the number of parts, simplify the configuration, and eliminate the need to arrange multiple magnetic heads. It has the advantage of being able to implement a recording system.

[Brief explanation of drawings]

The following information is provided to explain the present invention; FIG. 1(a) is a side view showing an example of a conventional perpendicular recording magnetic head, and FIG. 1(1)) is a side view of a recording medium showing an example of the recording. Explanatory diagram, 2nd
The figure shows another example of a conventional perpendicular recording magnetic head.
Fig. 3(a) is a side view showing an embodiment of the perpendicular recording magnetic head of the present invention, and Fig. 3(1)) is a side view showing an embodiment of the perpendicular recording magnetic head of the present invention.
) Theory showing the state of magnetic flux in the magnetic head, Kaikoku 1
FIG. 4 is a perspective view showing another embodiment 7/iii of the present invention. 1... Head core, 2... Head yoke, 3... Coil, 4... Gap for blue engraving, 5... Glass,
6. Recording medium, 7. Surface in contact with recording medium, 8.. Magnetic thin film, 9. 6. For gear patent for sale. Applicant: Nippon Telegraph and Telephone Public Corporation Representative, Patent Attorney Yoshi) J] Seitaka Figure 1 ( (1) (b) Figure 2

Claims (1)

[Claims] A magnetic head for perpendicular recording, characterized in that a magnetic thin film is formed on a surface of the magnetic head that includes a writing gap and is in contact with a recording medium, and a read gap with a narrow gap width is formed in a position of the magnetic thin film that overlaps the gap. .