JPH04362506A - Laminated head - Google Patents

Abstract

PURPOSE:To allow the use of a high-permeability and high-saturation magnetization alloy which is inferior in terms of corrosion resistance and to provide the laminated head having excellent writing and reading out characteristics by forming the laminated head of the constitution provided with corrosion resistance. CONSTITUTION:A pair of pole pieces 23, 25 of a yoke 9 of the laminated head are formed by using, for example, 'SENDUST(R)' which is a high-corrosion resistant magnetic material and rear side regions 24, 25 are formed by using, for example, Fe-Si, which is the high-permeability and high-saturation magnetization alloy.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stacked head, particularly a thin film magnetic head used for a magnetic disk, a perpendicular thin film magnetic head, and a yoke type MR head.

0002

2. Description of the Related Art A stacked head writes and reads high-density data on a magnetic recording medium such as a magnetic disk. The following laminated head configured to improve the writing and reading characteristics is known.

As shown in FIG. 3, which is a partial cross-sectional view of the yoke and windings of a thin-film magnetic head 39, which is a laminated head, the thin-film magnetic head 39 is formed on a base 30, and has a pair of pole pieces 31. , 33 and rear regions 32, 34, and a conductive winding 37 electrically insulated by insulator layers 36, 38 between the two magnetic layers. It is a laminated head.

The pair of pole pieces 31 and 33 are made of a high saturation magnetization alloy, for example 45/55Ni-F.
By using 81/19Ni-Fe, which is a high magnetic permeability alloy, in the rear regions 32 and 34, the writing and reading characteristics are improved (Japanese Patent Laid-Open No. 60-1
Publication No. 0410).

[0005] As the performance of the laminated head increases,
It is desired to use materials with even higher magnetic permeability than permalloy, and in some systems, materials with high permeability and high saturation magnetization,
For example, Fe-Si, Fe-N, Fe-N-Zr, Co-
Fe-Si, Co-Fe-P, etc. have been developed.

[0006]

However, when the above-mentioned high magnetic permeability, high saturation magnetization alloy is used in a laminated head, the following problems occur. In other words, most of the high magnetic permeability, high saturation magnetization alloys are inferior to permalloy in terms of corrosion resistance, and due to the structure of the laminated head, they are corroded and oxidized at the tip of the pole piece, which is constantly exposed to the atmosphere. .

The present invention has been made in view of the above circumstances, and by using a high magnetic permeability and high saturation magnetization alloy as the material of the laminated head, the magnetic permeability and saturation of the entire yoke including the pole piece can be improved. It is an object of the present invention to provide a laminated head having a structure that can maintain magnetization at a high level and solve the problem of poor corrosion resistance of the above-mentioned materials.

[0008]

Means for Solving the Problems In order to achieve the above object, the laminated head of the present invention has a pair of pole pieces defining a transducing gap at one end, and two pole pieces in contact with each other at the other end. A laminated head having a yoke made of a magnetic layer and a conductive winding electrically insulated between the two magnetic layers, the pole piece extending from a transducing gap of the yoke to a position exceeding an initial saturation point. Made of highly corrosion resistant magnetic material,
The remaining portion of the yoke is made of an alloy with high magnetic permeability and high saturation magnetization.

[0009]

[Function] According to the above-mentioned configuration, since the yoke portion is made of an alloy with high magnetic permeability and high saturation magnetization, the magnetic permeability and saturation magnetization of the laminated head can be maintained at a high level, and the pole piece Since it is made of a highly corrosion-resistant magnetic material, the high magnetic permeability and high saturation magnetization alloy is thereby not exposed to the atmosphere and is not corroded.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be specifically described below with reference to the drawings.

The structure of a thin film magnetic head, which is a laminated head, is shown in FIG. The thin film magnetic head 1 is formed on a base body 2 made of an insulating material, and has a fan-shaped yoke 9 formed at its tip. A foil coil 6 having a substantially elliptical shape as a whole is provided so as to include this yoke 9. The foil coil 6 is electrically insulated, and one end thereof is connected to a lead portion 12 at the center portion 11, and the other end is connected to a lead portion 13, and write and read signals are transmitted via the lead portions 12 and 13. and transmitted. The yoke 9 includes a pair of pole pieces P extending from the conversion gap at the tip to a position exceeding the initial saturation point, and a rear region B.
and a rear gap 10 provided within this rear region B.

Further, as shown in FIG. 2, the yoke 9 includes a lower magnetic layer 3 having one pole piece 23 and a rear region 24, and a lower magnetic layer 3 having one pole piece 23 and a rear region 24.
6 and an upper magnetic layer 8.

The pair of pole pieces 23 and 25 are made of a highly corrosion-resistant magnetic material such as sendust, and the rear regions 24 and 26 are made of a high magnetic permeability and high saturation magnetization alloy such as Fe- It is made of Si. This Fe-
Si is 2.0, although it varies depending on the Si content.
It has a high saturation magnetization of around [T] and a high magnetic permeability of 1500 or more. The high permeability and high saturation magnetization alloys used here include Fe-N, Fe-N-Zr,
May be Co-Fe-Si, Co-Fe-P, etc.
Further, the highly corrosion-resistant magnetic material may be Fe-Ni or the like.

Between the lower magnetic layer 3 and the upper magnetic layer 8, a gap-forming nonmagnetic layer 4 and a first insulating layer 5 made of, for example, Al2O3 and having a predetermined thickness are formed. has been done. A foil coil 15, which is a conductive winding, is attached on the first insulator layer 5, and a second insulator layer 6 and a third insulator layer 7 are formed to cover this.

The thin film magnetic head 1 described above is first made of Al2
One pole piece 23 made of Sendust is patterned on the base 2 made of O3 and having a predetermined thickness, and the rear region 2 of the lower magnetic layer 3 made of Fe-Si is formed.
4 is patterned. On top of this, add Al2O3,
After a gap-forming non-magnetic layer 4 having a predetermined thickness has been formed, for example by sputtering deposition, a first insulating layer 5 consisting of an insulating layer such as a novolac resin-based layer is formed. Next, place the foil coil 1 on top of this.
5 is formed by masking techniques and electrodeposition,
A second insulator layer 6 made of an insulator layer such as a novolac resin is formed, and a foil coil 15 and a third insulator layer 7 are formed in the same manner. Thereafter, the remaining pole piece 25 made of Sendust is patterned and F
The rear region 26 of the upper magnetic layer 8 of e-Si is patterned.

In this way, a highly corrosion-resistant magnetic material is used only in the pair of pole pieces 23 and 25 of the thin-film magnetic head 1,
By forming the rear regions 24 and 26 using an alloy with high magnetic permeability and high saturation magnetization, the thin film magnetic head 1 has a structure that is substantially the same as if the entire yoke were formed from an alloy with high magnetic permeability and high saturation magnetization. , can perform write and read functions with excellent characteristics.

By forming the pair of pole pieces 23 and 25 exposed to the atmosphere using Sendust, which is a highly corrosion-resistant magnetic material, the rear regions 24 and 26 are made of an alloy with high magnetic permeability and high saturation magnetization. It is possible to prevent corrosion of

[0018]

According to the present invention described in detail above, it is possible to use a high magnetic permeability and high saturation magnetization alloy, which is inferior in corrosion resistance, as a material for a laminated head.
It becomes possible to provide a stacked head with excellent read characteristics.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway enlarged perspective view of a laminated head according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line X-X' of the laminated head shown in FIG. 1;

FIG. 3 is a partial cross-sectional view of a yoke and a winding of a conventional laminated head.

[Explanation of symbols]

1 Thin film magnetic head 2 Base 3 Lower magnetic layer 4 Gap forming non-magnetic layer 5 First insulator layer 6 Second insulator layer 7 Third insulator layer 8 Upper magnetic layer 9 York 15 Foil coil 23, 25 Pole piece 24, 26 Posterior area

Claims (1)

[Claims] 1. A yoke comprising two magnetic layers having a pair of pole pieces defining a transducing gap at one end and in contact with each other at the other end, and a conductive material having electrical insulation between the two magnetic layers. a laminated head having a winding, the pole piece extending from the transducing gap of the yoke to a position beyond the initial saturation point is formed of a highly corrosion-resistant magnetic material, and the remaining portion of the yoke is made of a highly permeable and highly resistant magnetic material; A laminated head characterized by being made of a saturation magnetization alloy.