JPS61194620A - Thin film magnetic head - Google Patents

Abstract

PURPOSE:To execute the high density recording under optimum conditions of recording and reproducing effeciency by sharing some part of one magnetic layer of the 1st magnetic circuit, opening medium facing ends of a medium and providing the 2nd reproducing magnetic converter constituted with the 2nd magnetic circuit in-cluding a magneto resistance effect element structure having one connected end inside. CONSTITUTION:A base insulating material 2 is formed on a substrate 1 and then the magnetic layer 3 is formed. Moreover the MR element structure 4 is formed at the medium facing end 11 of the magnetic layer 3, and then a magnetic layer 5 is formed. Gaps 13a and 13b are formed between the magnetic layers 3 and 5 and the MR element structure 4 and connected to the end which does not face the medium. Said magnetic layers 3 and 5 comprise one end of a recording magnetic circuit 10. Then a gap 6 is built up and thereon a conductive coil 6 is formed. Next a magnetic layer 8 is formed so that the magnetic layer 5 and the medium facing end 11 can comprise the gap 6 and the layer 8 can connect to the magnetic layer 5 at its other end. The element group is cut, and the medium facing end 11 is processed, whereby the recording magnetic circuit 11 with the magnetic gap 6 and the MR element structure 4 form integrally a thin film magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a thin-film magnetic head, and more particularly to a thin-film magnetic head suitable for high-density recording under optimal conditions for recording efficiency and reproduction efficiency.

[Background of the invention]

Conventionally, an example of a thin film magnetic head for high-density recording is a magnetoresistive element structure (hereinafter referred to as an MR element structure).
A single head assembly incorporating an inductive magnetic circuit is known (Japanese Unexamined Patent Publication No. 59-30223, No. 5).
1 148411). These examples are shown in Figure 2.
It is shown in Figure 3.

The thin film magnetic head shown in FIG. 2 has an MR element structure 31 placed in a gap 36 between an inductive recording magnetic circuit (hereinafter referred to as a recording magnetic circuit) 32 consisting of a conductor coil 35 and magnetic layers 33 and 34. It is.

However, according to this structure, the MR element structure 3 during reproduction
The gap 36, which determines the efficiency of the recording magnetic circuit 32 during writing, and the gap 37, which determines the efficiency of the recording magnetic circuit 32 during writing, are in a contradictory relationship, making this structure difficult to optimize both recording efficiency and reproduction efficiency. .

The above structure is improved as shown in FIG.

JP-A-51-148411 discloses a structure in which thin magnetic shielding films 41 and 42 are provided on both sides of the MR element structure 31 within the gap 36 of the recording magnetic circuit 32. According to this structure, recording efficiency and reproduction efficiency can be individually optimized, but there is a problem that the manufacturing process increases because the magnetic shield films 4+ and /12 are formed.

[Purpose of the invention]

The purpose of the present invention is to solve these conventional problems and provide a thin-film magnetic head that can perform high-density recording under optimal conditions for recording efficiency and playback efficiency without significantly increasing the magnetic head manufacturing process. It's about doing.

[Summary of the invention]

In order to achieve the above object, the present invention provides a first magnetic circuit made up of at least two magnetic layers with one end facing the medium open and the other end connected, and a conductor interlinked with the first magnetic circuit. A magnetic converter that shares at least a part of one magnetic layer of the first magnetic circuit, has an open end facing the medium, and has the other end connected to a first recording magnetic transducer configured with a coil. The present invention is characterized in that it has a second reproducing magnetic transducer constituted by a second magnetic circuit including a resistive effect element structure therein.

[Embodiments of the invention]

Two embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional structural diagram of a thin film magnetic head showing one embodiment of the present invention.

In FIG. 1, a base insulator 2 is formed on a substrate 1, and a magnetic layer 3 is formed. Furthermore, the medium facing end 11 of the magnetic layer 3
An MR element structure 4 is formed thereon, and a magnetic layer 5 is formed thereon. M
The R element structure 4 is composed of an MR film (magnetoresistive film), a bias layer, and the like. In addition, magnetic layers 3 and 5 and M
R element structures 13a and 13b are formed. magnetic layer 3
．． 5 is made of a magnetic material and connected at the end not facing the medium, and these magnetic layers 3 and 5 form one leg of the recording magnetic circuit 10.

Next, a gap 6 is formed, and a single or double layer conductor coil 7 is wound a predetermined number of times (for example, several times to several times) on the gap 6.
form. Then, a magnetic layer 8 having a thickness of 1000OA to 2000OA is formed so as to form a gap 6 between the magnetic layer 5 and the medium facing end 11, and to be connected to the magnetic layer 5 at the other end.

In this way, the recording magnetic circuit 10 is formed.
The previously formed conductor coil 7 is interlinked with the recording magnetic circuit 10. Further, the gap 6 between the magnetic layer 5 and the magnetic layer 8 at the medium facing end 11 of the recording magnetic circuit 10 is 5.
Selected from 000A to 2000OA.

Furthermore, these are covered with a protective insulator 9. The element group formed all at once on the substrate 1 through such a process is cut by one machining process, and the medium facing end 11 is processed to form a recording magnetic circuit 10 having a magnetic gap 6 and an MR element structure. 4 is integrated to form a thin film magnetic head.

The operating principle of the thin film magnetic head shown in FIG. 1 will be explained below.

A recording current is passed through the conductor coil 7 interlinked with the recording magnetic circuit 10. At this time, magnetic flux flows through the magnetic layers 3, 5, and 8 constituting the recording magnetic circuit 10, and information is written on the medium 12 by leakage flux generated by the magnetic gap 6. Magnetic layer 3 used as one leg of recording magnetic circuit 10
．． The medium facing end 11 of 5 includes the MR element structure 4 and gaps 13a and 13b, or by setting the gap 6 on the medium outflow side 14, the recording magnetic field to the medium 12 is determined by the magnetic layer 8. The influence of the MR element structure 4 and the gaps 13a, 13b is almost eliminated. The recording efficiency was measured for magnetic layers 3, 5 and 8. The regeneration efficiency, which will be described later, is determined by the gap 6, and each dimension can be individually determined and optimized.

On the other hand, during reproduction, the magnetic flux on the medium 12 is detected by the MR element structure 4. At this time, the magnetic layer 3.5 acts as a shield layer for the MR element structure 4. The reproduction efficiency of the MR element structure 4 is determined by the gap 13a, 1 rather than the thickness of the magnetic layer 3.5.
3b, an extremely efficient reproducing head can be obtained.

In this manner, according to the present embodiment, the recording magnetic circuit 1
0 magnetic layers 3.5 and 8 can be made thicker, and the gap 6 can also be designed to have an optimal length. Furthermore, regarding the MR element structure 4 for reproduction, due to the gaps 13a and 13b,
Since it can be designed under optimal conditions, extremely efficient recording and reproducing magnetism can be obtained.

Also, to further improve recording efficiency.

It is also possible to make one or both of the magnetic layers 5 and 8 thick by forming magnetic layers 21 and 22, as in the thin film magnetic head shown in FIG. 4 of another embodiment.

Furthermore, according to this embodiment and other embodiments, the recording head and the reproducing head have an integrated structure, and the recording head and the reproducing head can be manufactured separately in a structure with optimal conditions, and a high density Recording (especially high-frequency recording) becomes possible [Effects of the Invention] As explained above, according to the present invention, each of recording efficiency and reproduction efficiency can be improved without significantly increasing the magnetic/rad manufacturing process. enables high-density recording under optimal conditions.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional structural diagram of a thin-film magnetic head showing one embodiment of the present invention, FIGS. 2 and 3 are cross-sectional structural diagrams of a conventional thin-film magnetic head, and FIG. 4 is a cross-sectional structural diagram of a conventional thin-film magnetic head. FIG. 2 is a cross-sectional structural diagram of the thin film magnetic head shown in FIG. 1: Substrate, 2: Base insulator, 3.5, 8, 2122.3
3.34: Magnetic layer, '4.31: MR element structure, 6,
13a, 13b, 36.37: Gap, 7, 35: Conductor coil, 9: Protective insulator, 10.32 Two recording magnetic circuits, 11: Medium facing end, 12: Medium, 14: Medium outflow side, 41 , 42: Magnetic shielding film. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (1) A first magnetic circuit consisting of at least two magnetic layers with one end facing the medium open and the other end connected, and a conductor coil interlinked with the first magnetic circuit. The recording magnetic transducer includes therein a magnetoresistive element structure that shares at least a portion of one magnetic layer of the first magnetic circuit, has an open end facing the medium, and is connected to the other end. A thin film magnetic head characterized by having a second reproducing magnetic transducer constituted by a second magnetic circuit.