JPH0630905U - Magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the recording sensitivity of a laminated magnetic head in which magnetic films are laminated in the track direction. [Structure] By laminating the stacking position of the multilayer magnetic film 12 composed of the magnetic film 12a and the non-magnetic layer 12b in the track width direction with a gap as a boundary, the non-magnetic layers 12b on both sides forming an unrecorded area are formed. , 12b are arranged so that they do not overlap each other, and the non-recording area in the track is eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head using a magnetic film.

[0002]

[Prior art]

 Conventionally, in Japanese Laid-Open Patent Application No. 4-125806, there is known a magnetic head in which a pair of cores having a magnetic film formed thereon are arranged to face each other to form a predetermined gap. In a magnetic head using such a magnetic film, a so-called laminate type magnetic head has recently been developed, in which magnetic films are laminated in the track width direction.

In this laminated magnetic head, for example, as shown in FIGS. 5 and 6, each of a pair of cores 1 and 1 arranged to face each other so as to form a gap G in the track width direction. Laminated magnetic films 2 and 2 are formed, and non-magnetic substrates 3 and 3 are arranged on both sides of each magnetic film 2 in the track width direction so as to sandwich the magnetic film 2. There is. The magnetic film 2 is formed by stacking a magnetic film made of a ferromagnetic material and a non-magnetic layer made of glass or the like. The magnetic film 2 and the non-magnetic substrate 3 described above are covered with a tape on the gap forming surface. Is configured to run. A coil 6 for inputting and outputting a recording / reproducing signal is wound around the core 1 through a coil window 5 formed in a portion where the cores 1 and 1 face each other.

At this time, in particular, as shown in FIG. 6, in the cores 1 on both sides of the gap G, the layers of the magnetic film 2 are aligned in the track width direction. That is, the respective layers of the magnetic film 2 on both sides of the gap G are set to have the same film thickness so as not to cause the track shift, and are arranged at the same laminated position.

[0005]

However, as shown in FIG. 7, a portion corresponding to the non-magnetic layer (glass) is included in the track T recorded by the laminated magnetic head having the above structure. In addition, there is a problem that the non-recorded area T ′ remains in a strip shape. If such a non-recording area T'is left, the so-called recording sensitivity is lowered, and there is a possibility that reproduction deterioration may occur.

Therefore, the present invention aims to provide a laminated magnetic head having excellent recording sensitivity.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a magnetic head in which cores are arranged facing each other on both sides of a predetermined gap as a boundary, and the core has a track width of a set in which a magnetic film and a non-magnetic layer are superposed. It has a multilayer magnetic film formed by laminating a plurality of sets in the direction, and the magnetic film and the non-magnetic layer in the multilayer magnetic film are displaced in the track width direction on both sides of the gap.

[0008]

[Action]

 In the means having such a structure, since the multilayer magnetic film is displaced in the track width direction, recording is performed evenly over the entire track width, and no non-recorded area is formed in the track. It is like this.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a multilayer magnetic film 12, 12 is laminated in the track width direction (vertical direction in FIG. 1) on each of the pair of cores 11, 11 arranged so as to face each other so as to form the gap G. Has been done. Non-magnetic substrates 13 and 13 are arranged on both sides of each of the multilayer magnetic films 12 in the track width direction so as to sandwich the multilayer magnetic film 12, respectively. The tape is run on the surface on which the gap G at 13 is formed.

The multi-layered magnetic film 12 is formed by laminating a plurality of sets in which the magnetic film 12a and the non-magnetic layer 12b are superposed on each other in the track width direction. Among them, the magnetic film 12a is a ferromagnetic metal. For example, sendust or the like is used, and a glass material (SiO ₂ ) or the like is used as the nonmagnetic layer 12b. The magnetic film 12a and the non-magnetic layer 12b are formed to have a uniform film thickness by a known thin film forming technique such as sputtering, ion beam sputtering or vapor deposition. Is formed to have a sufficient film thickness.

At this time, the magnetic film 12a and the non-magnetic layer 12b of the multilayer magnetic film 12 are displaced in the track width direction on both sides (both left and right in the figure) with the gap G as a boundary. That is, the magnetic films 12a and the non-magnetic layers 12b on both sides of the gap G are set to have the same film thickness, but the arrangement positions in the track width direction are displaced from each other. That is, the non-magnetic layer 12b forming the non-recorded area (see reference numeral T'in FIG. 7) is displaced in the track width direction on both sides of the gap G so as not to overlap. The positional shift amount between the multilayer magnetic films 12 in this embodiment is set within a range not exceeding ± 50% with respect to the film thickness of the magnetic film 12a.

On the other hand, as the non-magnetic substrate 13 of each core 11, a non-magnetic head substrate material such as crystallized glass or ceramics is used. Note that the non-magnetic material as in this embodiment is used, for example, when it is premised on the use of a high frequency band near 10 MHz, and when it is assumed that it is used up to a high frequency band of about 5 MHz. Ferromagnetic oxides such as ferrite and sendust alloy, which have high magnetic permeability, are used.

As described above, in the present embodiment, the non-magnetic layers 12b and 12b forming the non-recorded area are displaced from each other with the gap G as a boundary so as not to overlap in the track width direction. Recording is being performed over the entire width. That is, a non-recording area (see T'in FIG. 7) is not formed in the recording track, and as a result, the recording sensitivity is improved.

More specifically, as shown in FIG. 4, “sensitivity” (“sensitivity” () of the conventional laminated magnetic head in which the “shift amount with respect to film thickness” (horizontal axis) is set to “0”. When the (vertical axis) is A, the “sensitivity” of the laminated magnetic head in which the multilayer magnetic film 12 is displaced in the track direction as in the present embodiment is the above A as shown in the area B. Has been improved over.

Next, in the embodiment shown in FIG. 2, the multi-layered magnetic film 12 on one side (the left side in the figure) with the gap G as a boundary is formed by a magnetic film 12a and a non-magnetic layer 12b having a normal film thickness. The multi-layered magnetic film 12 on the other side (on the right side in the drawing) is constituted by a magnetic film 12a and a non-magnetic layer 12b having different thicknesses. In the second embodiment as well, the magnetic films 12a and the non-magnetic layers 12b on both sides of the gap G are displaced from each other, and the same action and effect as those of the first embodiment can be obtained. Obtainable.

Further, in the embodiment shown in FIG. 3, the magnetic film 12a and the non-magnetic layer 12b in the multilayer magnetic film 12 on the one side (the left side in the figure) with the gap G as a boundary are formed with normal film thicknesses. , The magnetic films 12a and the non-magnetic layers 12b in the multilayer magnetic film 12 on the other side (the right side in the drawing) are provided with different numbers of films, so that the magnetic films 12a and the non-magnetic layers 12b on both sides of the gap G are different from each other. Are displaced from each other. Also in such a third embodiment, it is possible to obtain the same action and effect as those of the first and second embodiments.

[0017]

[Effect of device]

 As described above, in the laminated magnetic head according to the present invention, the stacking position of the multilayer magnetic films is displaced in the track width direction so that the non-magnetic layers forming the non-recorded area are separated by the gap G. The recording sensitivity is improved by eliminating the non-recording area in the track.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing the structure of a laminated magnetic head according to a first embodiment of the invention.

FIG. 2 is a cross-sectional explanatory view showing the structure of a laminated magnetic head according to a second embodiment of the invention.

FIG. 3 is a cross-sectional explanatory view showing the structure of a laminated magnetic head according to a third embodiment of the invention.

FIG. 4 is a diagram showing the relationship between the positional shift amount of a magnetic film and recording sensitivity.

FIG. 5 is an external perspective view illustrating a general structure example of a laminated magnetic head.

6 is a cross-sectional explanatory view of the general laminate type magnetic head shown in FIG.

FIG. 7 is an enlarged plan view showing a track recorded by a general laminate type magnetic head.

[Explanation of symbols]

 11 core 12 multilayer magnetic film 12a magnetic film 12b non-magnetic layer 13 non-magnetic substrate G gap

Claims (2)

[Scope of utility model registration request] 1. A magnetic head in which cores are arranged facing each other on both sides of a predetermined gap as a boundary, and the core is formed by stacking a plurality of sets in which a magnetic film and a non-magnetic layer are superposed in the track width direction. And a magnetic film and a non-magnetic layer in the multi-layered magnetic film, wherein the magnetic film and the non-magnetic layer are displaced from each other in the track width direction on both sides of the gap. 2. The magnetic head according to claim 1, wherein the thickness of the magnetic film is different on both sides of the gap.