JPS58171711A - Vertical magnetizing head - Google Patents

Abstract

PURPOSE:To make the tunnel erasure possible, by forming a main magnetic pole thin film on one side face of a core where the center part in one end part is notched and a nonmagnetic material is packed there and providing an erasing gap between two U-shaped cores on the side opposite to this thin film. CONSTITUTION:A notched part is provided in the center of one end part of a core 8 consisting of a magnetic material, and a nonmagnetic material 10 is packed there, and projecting parts 8' and 8'' are formed on both sides of the core 8. A soft magnetic thin film 3 is formed on one face of the core 8 including the nonmagnetic material part 10 to make a main magnetic pole of vertical magnetic recording. U-shaped cores 11 and 11' where coils 13 and 13' (which are not shown in figure) are butted on the opposite face of the core 8, and a gap material is inserted between end parts 8 and 8' to form erasing magnetic heads 12 and 12'. Thus, both end parts of a track where information is recorded vertically magnetically by the main magnetic pole 2 and an auxiliary magnetic pole, which is not shown in figure, are erased effectively by erasing magnetic heads 12 and 12', and a head suitable for high-density recording is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a perpendicular magnetization head used in a perpendicular magnetic recording/reproducing device such as a floppy disk drive device, and provides a perpendicular magnetization head having a function of erasing both ends of a data track (tunnel erasing). It is.

FIG. 1 is similar to conventional perpendicular magnetization by showing a do (hereinafter simply referred to as a perpendicular head).

In FIG. 1, 1 is a main magnetic pole in which a soft magnetic thin film (main magnetic pole thin film) 2 of permalloy or the like formed by a method such as a sputtering method or vapor deposition method is sandwiched between non-magnetic materials 3, and 4 is a winding 5. This is an auxiliary magnetic pole made of a soft magnetic material such as ferrite.

The recording medium 6 runs in contact with the tip of the main magnetic pole 1 on the side facing the auxiliary magnetic pole 4 . In FIG. 1, the magnetic field generated by the auxiliary magnetic pole 4 is focused by the main magnetic pole thin film 2, and recording is performed on the recording medium 6 by this focused strong and sharp magnetic field.

On the other hand, as shown in FIG. 2, an excitation method is already known in which a winding 5 is directly applied to the main pole 1 and the auxiliary pole is omitted. Regarding the recording/reproducing sensitivity, the main magnetic pole excitation shown in FIG. 2 is generally inferior to the auxiliary magnetic pole excitation shown in FIG. 1.

The following method is known for improving the recording and reproducing sensitivity of the conventional vertical head.

That is, as shown in FIG. 3(a), a core 7 made of a soft magnetic material such as a plate or a modified ferrite is placed on one or both sides of the main pole film 2 at the base of the main pole film 2. This is something I would like to ask you about. Here too, the tip of the main pole film is protected by the non-magnetic material 3. This improvement can also be applied to main pole excitation, as shown in (1) in the same figure.

By the way, generally in a magnetic recording device, the track position is 16.
If this is done in a state where there is a misalignment (so-called off-track), the magnetic disk I
+" Data DI remains without being updated. Since this degrades the S/N ratio of the reproduced signal as noise, it is important in practical applications to take measures against this phenomenon. For this purpose, it is effective to erase both ends S of the data track using an erase head (tunnel erase) as shown in FIG. 1(b).

In recent years, many proposals have been made for perpendicular magnetic recording heads, which have attracted attention as a high-density recording method, and the tunnel erase head (hereinafter simply referred to as erase head) has been proposed.
There is no such thing that takes into account the provision of.

However, since off-track occurs due to expansion and contraction of the disk and various parts of the drive due to fluctuations in temperature and humidity, a vertical head without an erase head causes the above-mentioned drawbacks.

The present invention eliminates this drawback, and its structure and operation will be described below.

FIG. 5 shows a perpendicular magnetization head in one embodiment of the present invention. In FIG. 5, reference numeral 8 denotes a rectangular parallelepiped core made of magnetic material, and one end surface (the end surface that contacts the recording medium) of this core 8 has both end portions 8' and 8'' as shown in FIG.
A notch 9 is formed leaving the . 10 is a non-magnetic material filled in the notch 9. 2 is a soft magnetic thin film (main magnetic pole thin film) provided at the center of one side of the core 8 including the side of the non-magnetic material 10, and this soft magnetic thin film 2 is made of permalloy or the like. It can be formed by sputtering, vapor deposition, etc. 11.11' is a U-shaped core made of a soft magnetic material such as ferrite, and one end surface of this U-shaped core 11, II' is connected to the other side of the core 8 (where the soft magnetic thin film 2 of the core 8 is attached). (on the opposite side of the screen). 1
2.12' is a gap formed between the other end surface of the U-shaped core 11.11' and the other side surface of the core 8, and 13.13' is a gap wound around the U-shaped core 11.11'. This winding 13.13' is an IJ-shaped core 11.
It is provided by utilizing the gap between 11' and the core 8. Note that the winding port is not shown. The above U-shaped core 11, l
l' may be fixed to the side of the core 8 where the main pole thin film 2 is provided.

In FIG. 5, both ends 8 of the core 8 viewed in the track direction
The area around ' and 8'' becomes part of the magnetic path of the ring-shaped erase head, while the central part performs the core function of the vertical head for recording and reproducing.Therefore, the erase track width is It is defined by the width of the remaining core and the tr-shaped core.At this time, the data track width is definitely limited to 11:1 by the width of the soft wire thin film 2 due to the sharp magnetic field distribution of the vertical head.

In addition, in order to reduce crosstalk through the erasing head during beef cattle, core 8 and U-shaped core 11.1 are used as shown in Fig. 8.
1' of the erasing head formed by the gap 12.1';
! It is effective to make the magnetic field inclination and non-parallel with respect to the soft magnetic thin film 2 to intentionally cause so-called anomalous loss on the erase side.

As mentioned above, Q-F is used as an excitation method for vertically (
There are two types: a) auxiliary magnetic pole excitation, and (b) main magnetic pole excitation.
Both of these are possible in the present invention.

A specific example will be described. That is, (a) Auxiliary magnetic pole excitation As shown in FIG. 9, erasing windings 13, 13' are applied to the U-shaped core 11, 11', and the cores 11, 11' are arranged opposite to the soft magnetic thin film 2 with the recording medium in between. The auxiliary magnetic pole 4 is arranged at the position. By doing so, it is possible to achieve both recording/reproducing and tunnel erasing functions that operate independently.

(b) Main magnetic pole excitation As shown in FIG. 1 ( ), a winding 14 is provided on the core 8, and this winding 14 is used for both recording and reproducing and erasing. When a recording current is passed through this winding 11, recording is performed through the soft magnetic thin film 2, but at the same time, the signal magnetic flux is transferred to the U-shaped core 11.
′ also flows. At this time, since recording demagnetization is significant in the wide gear knob 7, no signal is recorded, and as a result, the recording medium is erased in an alternating current manner.

Needless to say, it is also possible to wind the U-shaped core 11, 11' so that it functions independently as a cancellation winding, or in this case it would be necessary to provide a total of three sets of windings. . Furthermore, erasing using the recording demagnetization phenomenon described above can also be applied to the auxiliary magnetic pole excitation described in (a), where a recording signal current is applied to both the recording/reproducing winding and the erasing winding. However, it is also possible to omit the erasing electronic circuit.

Note that reproduction in the head of the present invention is performed in exactly the same way as in a normal head.

The present invention has the above configuration, and the following effects can be obtained according to the present invention.

(a) Since the recording/reproducing vertical head and the erasing head are arranged close to each other, it is possible to realize a perpendicular recording front disc head that is capable of tunnel erasing, which is important in practice.

(b) Since the core is also used as a part of the core of the erasing ring head, the structure is simple and manufacturing is easy.

It goes without saying that the present invention is not limited to the above-mentioned embodiments, and that various modifications can be made in accordance with the principle of constructing a tunnel erasing head using a part of the core of the vertical head.

[Brief explanation of the drawing]

1 and 2 are diagrams showing the basic configuration of a conventional perpendicular magnetization head, respectively, FIGS. 3(a) and 3(b) are diagrams showing the basic configuration of another conventional perpendicular magnetization head, and FIG. a) (
FIG. 5 is a perspective view of a perpendicular magnetization head according to an embodiment of the present invention, and FIG.
7 is a perspective view of the core of the perpendicular magnetization head, FIG. 8 is a two-sided view of another embodiment of the present invention, FIG. 9 is a perspective view of the same, and FIG. 10 is a further embodiment of the present invention. FIG. 7 is a perspective view of another embodiment. 2... Soft magnetic thin film 8... Core 9... Notch 10... Non-magnetic material 11, II'... U-shaped core 12.12'... Gap 13.13'... winding wire
14... Winding wire. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure (b) Figure 4 Figure II 8

Claims (1)

[Claims] (1) A core provided with a non-magnetic material in the center of one end;
It has a main magnetic pole thin film provided on the side surface of the non-magnetic material and the core, and a U-shaped core with one end fixed to the side surface of the core, and the other end surface of the U-shaped core and the core described above. A perpendicular magnetization head with an erasing gap formed between the side surface of the non-magnetic material and the side surface of the non-magnetic material. (2. A perpendicular magnetization head according to claim 1, in which a notch is formed in the center of one end of the core, and this notch is filled with a non-magnetic material. ( 3) A perpendicularly magnetized head according to claim 1, in which the erasing gap is tilted and non-parallel to the main pole thin film.