JPH087213A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a metal-in-gap type magnetic head having high wear resistance, preventing a pseudo-gap effect and reduced in strain amt. due to difference of thermal expansion characteristics of the constituting material. CONSTITUTION:This magnetic head consists of a nonmagnetic body 4 arranged to form the contact face with a magnetic recording medium, ferromagnetic metal oxide joined to the back of the nonmagnetic body 4, and a ferromagnetic metal thin film 2 which is arranged to form a magnetic gap G on a part of the contact surface of the nonmagnetic body 4 to a magnetic recording medium and is magnetically coupled with the ferromagnetic metal oxide. This ferromagnetic metal thin film 2 is magnetically coupled with the ferromagnetic metal oxide only near the joined interface between the nonmagnetic body 4 and the ferromagnetic metal oxide 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly to a magnetic head which is suitable for high density recording and which prevents occurrence of a pseudo gap action and has improved abrasion resistance.

[0002]

2. Description of the Related Art Recently, the density of magnetic recording has been increased and a metal tape using a high coercive force magnetic powder has been widely used as a magnetic recording medium. In order to record on such a tape, a magnetic head that generates a strong magnetic force is required, and a metal-in-gap (hereinafter referred to as MIG) in which a ferromagnetic metal having a high saturation magnetic flux density is also arranged in the magnetic gap part in the material of the magnetic head. Call) head is used. In this MIG head, as shown in FIG. 3, a magnetic core half formed by depositing a ferromagnetic metal thin film 2 having a high saturation magnetic flux density such as sendust on a ferromagnetic metal oxide 1 such as ferrite The ferromagnetic metal thin film 2 is abutted against the gap G so that the surface on which the ferromagnetic metal thin film 2 is formed is non-parallel, and is integrally formed with the glass 3. This is because the ferromagnetic metal thin film 2 and the ferromagnetic metal oxide 1 are arranged with the magnetic gap G in between, so that between the ferromagnetic metal thin film 2 and the ferromagnetic metal oxide 1 or between the ferromagnetic metal oxides 1 and 1. This is to avoid the problem that each acts as a pseudo gap. On the other hand, in such an MIG head, since the tape contact surface is formed of the ferromagnetic metal oxide 1 having low abrasion resistance, there is also a problem in abrasion resistance. In order to solve this problem, as disclosed in JP-A-63-98806, most of the tape contact surface as shown in FIG. 4 is formed of ceramic 4 as a non-magnetic material having high hardness. Then, a ferrite 5 is arranged as a ferromagnetic metal oxide which becomes a magnetic core bonded to the rear of the ceramic 4, and is arranged so as to form a magnetic gap G in the central portion of the tape contact surface of the ceramic 4. There has been proposed a MIG head having a sendust thin film 2 as a ferromagnetic metal thin film magnetically coupled with.

[0003]

However, when manufacturing the MIG head in which the tape contact surface is formed of a non-magnetic material, the thermal expansion of the ferromagnetic metal oxide, the non-magnetic material and the ferromagnetic metal thin film is performed. It is very difficult to match the characteristics, and in particular, the ferromagnetic metal thin film formed across both the ferromagnetic metal oxide and the non-magnetic material causes cracks due to strain due to the difference in thermal expansion during the heat treatment process. There is a problem that the characteristics are deteriorated even if cracks are not generated. Therefore, in order to manufacture such an MIG head, the materials used are limited to a combination of ferromagnetic metal oxides, non-magnetic materials, and ferromagnetic metal thin films, which have similar thermal expansion characteristics, and particularly magnetic materials. There is a problem in that it is not possible to freely select a ferromagnetic metal thin film material having optimum characteristics. In order to solve the above problems, the object of the present invention is to minimize the formation area of the ferromagnetic metal thin film and reduce the amount of strain due to the mismatch of the thermal expansion characteristics so that the contact surface with the magnetic recording medium is It is an object of the present invention to provide a structure capable of manufacturing a MIG head formed mostly of a nonmagnetic material with a good yield regardless of the thermal expansion characteristics of a ferromagnetic metal thin film material.

[0004]

A non-magnetic material arranged so as to form a contact surface with a magnetic recording medium, a ferromagnetic metal oxide bonded to the rear of the non-magnetic material, and the non-magnetic material. A magnetic head comprising a ferromagnetic metal thin film, which is arranged so as to form a magnetic gap in a part of a surface of a body for contacting a magnetic recording medium, and which is magnetically coupled with the ferromagnetic metal oxide. The thin film is magnetically coupled to the ferromagnetic metal oxide only near the bonding interface between the non-magnetic material and the ferromagnetic metal oxide. It is preferable that the ferromagnetic metal thin film is a thin film in which a ferromagnetic metal thin film and a non-magnetic insulating thin film are alternately laminated, and the ferromagnetic metal thin film is a FeTaN alloy.

[0005]

According to the above construction, the amount of strain of the ferromagnetic metal thin film due to the mismatch of the thermal expansion characteristics can be reduced because the contact area between the ferromagnetic metal thin film and the ferromagnetic metal oxide is small. The contact surface of is made of non-magnetic material except for the vicinity of the magnetic gap, and the magnetic head with high wear resistance and without pseudo-gap action has a good yield regardless of the thermal expansion characteristics of the ferromagnetic metal thin film material. Can be manufactured. Therefore, since the ferromagnetic metal thin film material can be freely selected, the MIG in which the magnetic metal thin film and the nonmagnetic insulating thin film are alternately laminated is used as the ferromagnetic metal thin film to reduce the eddy current loss. MIG that uses a head and FeTaN alloy thin film to improve magnetic recording and reproducing characteristics for high coercive force media
It is possible to realize a MIG head having a high wear resistance and no pseudo-gap action, which is made of a material having an optimum magnetic property such as a head.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The MIG head of the present invention is characterized by the portion where the ferromagnetic metal thin film is formed. That is, as shown in FIG. 1, the ceramic 4 and the ferrite 5 are provided on the inclined surface 7 on the gap facing surface side of the magnetic core half body 6 in which the ceramic 4 as the non-magnetic material and the ferrite 5 as the ferromagnetic metal oxide are joined.
The FeTaN alloy as a ferromagnetic metal thin film is exposed by a method such as a spatula by exposing the area up to the contact surface with the recording medium through the winding groove 8 formed in the ferrite 5 near the bonding interface with The thin film 2 is formed. And FIG.
As shown in FIG. 3, the magnetic core half body 6 is abutted at the gap facing surface at the FeTaN alloy thin film 2 forming portion, and the gap 3 (not shown) is formed by the glass 3 filled in the winding groove 8.
The magnetic gap G is formed through the above, and the magnetic core chip 9 is obtained by joining and integrating. Further, a coil (not shown) is mounted on the magnetic core chip 9 through the winding groove 8 to complete the magnetic head of the present invention.

With this structure, FeTa
Since the N alloy thin film 2 and the ferrite 5 are magnetically coupled and the bonding area between the FeTaN alloy thin film 2 and the ferrite 5 is small, the thermal expansion characteristics in the heat treatment process such as bonding and integration with the glass 3 are The amount of strain due to the difference is also reduced, and the magnetic characteristics of the FeTaN alloy thin film 2 do not deteriorate. Further, most of the contact surface with the magnetic recording medium is formed of the ceramic 4 having high hardness to improve wear resistance, and the contact surface with the magnetic recording medium is all non-magnetic except near the magnetic gap G. Since it is composed of the body, no pseudo gap occurs. An example in which the region where the FeTaN alloy thin film 2 is formed is the slope 7 from the winding groove 8 on the gap facing surface side of the magnetic core half 6 to the contact surface with the magnetic recording medium has been described. The present invention is not limited to this example, and is arranged so as to form a magnetic gap in a part of the magnetic recording medium contact surface of the ceramic 4 and is magnetically coupled to the ferrite 5 only near the bonding interface between the ceramic 4 and the ferrite 5. So that Fe
It goes without saying that the TaN alloy thin film 2 may be formed. As described above, the nonmagnetic material is ceramic 4, the ferromagnetic metal oxide is ferrite 5, and the ferromagnetic metal thin film is FeT.
Although an example using the aN alloy thin film 2 has been described, in the present invention, the amount of strain due to the mismatch of the thermal expansion characteristics of the constituent materials is small and need not be considered. , Permalloy, amorphous, etc. can be freely selected and used in combination. By using, as the ferromagnetic metal thin film 2, a laminated film in which an insulating film and a ferromagnetic metal thin film are alternately laminated, it is possible to provide an MIG head with good characteristics in which eddy current loss is prevented.

[0008]

According to the magnetic head of the present invention, since the contact area between the ferromagnetic metal thin film and the nonmagnetic material or the ferromagnetic metal oxide is small, the amount of strain due to the mismatch of the thermal expansion characteristics can be reduced. In particular, it is possible to prevent the deterioration of the magnetic characteristics of the ferromagnetic metal thin film, and to freely select the ferromagnetic metal thin film material. The material with the optimum magnetic characteristics is used, and the wear resistance is high and the pseudo gap action is high. A MIG head that does not occur can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a ferromagnetic thin film forming portion on a magnetic core half body of a magnetic head of the present invention.

FIG. 2 is a perspective view of a magnetic head according to an embodiment of the present invention.

FIG. 3 is a perspective view of a conventional MIG head.

FIG. 4 is a perspective view of an improved conventional MIG head.

[Explanation of symbols]

 2 Ferromagnetic metal thin film (FeTaN alloy) 3 Glass 4 Non-magnetic material (ceramic) 5 Ferromagnetic metal oxide (ferrite) 8 Square groove 9 Magnetic core chip G Magnetic gap

Claims (3)

[Claims] 1. A non-magnetic material arranged to form a contact surface with a magnetic recording medium, a ferromagnetic metal oxide bonded to the back of the non-magnetic material, and magnetic recording of the non-magnetic material. In a magnetic head, which is arranged so as to form a magnetic gap in a part of a medium contact surface and comprises a ferromagnetic metal thin film magnetically coupled to the ferromagnetic metal oxide, the ferromagnetic metal thin film is A magnetic head characterized in that it is magnetically coupled with the ferromagnetic metal oxide only in the vicinity of a bonding interface between the magnetic body and the ferromagnetic metal oxide. 2. The magnetic head according to claim 1, wherein the ferromagnetic metal thin film is a thin film in which ferromagnetic metal thin films and nonmagnetic thin films are alternately laminated. 3. The magnetic head according to claim 1, wherein the ferromagnetic metal thin film is made of FeTaN alloy.