JPH0554330A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain good magnetic efficiency and S/N and to prevent soft magnetic characteristics from being impaired as well as to substantially prevent the generation of magnetic saturation. CONSTITUTION:At least two magnetic contact projecting parts 3 which magnetically connect an upper magnetic layer 4 and a lower magnetic layer 2 are provided between these two layers and coils 6 are formed around the respective magnetic contact projecting parts 3 as center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for magnetic recording and reproduction, and more particularly to a magnetic head having an improved magnetic circuit structure.

[0002]

2. Description of the Related Art In recent years, there have been remarkable improvements in magnetic recording density, and increasing the coercive force of recording media is becoming the mainstream technology for that purpose. Therefore, also for magnetic heads, the development of magnetic layers using magnetic materials having a high saturation magnetic flux density has become active. Particularly in the field of magnetic heads used at high frequencies, a technique for forming the thin film with a thin film has become mainstream, and a thin film process is promising in terms of characteristics and production.

However, in the thin film magnetic head, magnetic saturation of the magnetic layer is likely to occur during recording due to its structure, and a structure around the magnetic layer needs to be devised.

As a magnetic head in consideration of this point, there is, for example, one having a structure shown in FIG. In this magnetic head, as shown in the figure, a lower magnetic layer 2 and a coil 6 are formed on a substrate 1 by a thin film process, and an upper magnetic layer 4 and a protective plate 9 are formed on the lower magnetic layer 2 and a coil 6 via a magnetic gap 5. It is configured by joining and joining with the mounting process.

Reference numeral 3 is a magnetic contact convex portion for magnetically coupling the upper magnetic layer 4 and the lower magnetic layer 2, and 8 is a convex portion corresponding to the track width formed in the lower magnetic layer 2 by a thin film process. The magnetic gap 5 includes the convex portion 8 and the upper magnetic layer 4.
It is formed between and.

[0006]

However, the above-mentioned conventional example has the following problems.

(1) When the number of turns of the coil 6 is increased,
The magnetic path length of the upper magnetic layer 4 and the like becomes long, and the magnetic efficiency deteriorates.

(2) When the number of turns of the coil 6 is increased,
The coil length increases, the coil resistance increases, impedance noise occurs, and the S / N deteriorates.

(3) If the number of layers of the coil 6 is increased in order to solve the above (1) and (2), the number of manufacturing steps increases and the cost increases.

(4) When the number of layers of the coil 6 is increased, the layer thickness of the coil 6 becomes thicker, and the step over which the upper magnetic layer 4 and the like are crossed over becomes higher. The step coverage of the magnetic layer is deteriorated at the step portion, and the soft magnetic characteristics are significantly impaired due to the disorder of crystal growth and the concentration of stress during the film formation, and the efficiency is likely to be lowered.

The present invention has been made by paying attention to such conventional problems, and (1) magnetic efficiency is good, and (2)
Good S / N, (3) Soft magnetic properties are not impaired, (4)
An object of the present invention is to provide a magnetic head in which magnetic saturation hardly occurs.

[0012]

A magnetic head provided by the present invention is provided with at least two magnetic contact portions for magnetically connecting both magnetic layers between an upper magnetic layer and a lower magnetic layer. A coil is formed around the part around the part.

[0013]

According to the present invention, an increase in the magnetic path length of the magnetic layer or the like can be suppressed, and the coil resistance can be reduced to suppress the generation of impedance. Further, the step over the magnetic layer is not increased. Further, since the area of the magnetic contact portion is increased, magnetic saturation hardly occurs.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 is a substrate, 2 is a lower magnetic layer formed on the substrate 1, and two magnetic contact convex portions 3 to be described later are centered on the lower magnetic layer, and a coil 6 is provided around each of them three turns ( In the case of this embodiment), it is formed in a spiral shape. The magnetic contact protrusions 3 are provided on the lower magnetic layer 2, and are formed on the lower magnetic layer 2 and the upper magnetic layer 4 described later.
It is for magnetic coupling of. Reference numeral 7 denotes a conductor which passes above the coils 6 and is connected to the center of each coil 6.

Reference numeral 4 denotes an upper magnetic layer, one end of which is fixed to the magnetic contact convex portion 3 side located at the center of the spiral coil 6 and is magnetically coupled to the lower magnetic layer 2. . The other end of the upper magnetic layer 4 is guided to the sliding surface side of the magnetic recording medium and is fixed on the convex portion 8 formed in the lower magnetic layer 2 and corresponding to the track width. Reference numeral 5 is a magnetic gap formed between the tip of the protrusion 8 corresponding to the track width and the upper magnetic layer 4, and 9 is a protective plate.

The magnetic head having the above-mentioned structure is manufactured by the thin film deposition method, the photolithography technology and the mounting process technology. In this embodiment, the substrate 1 is made of a non-magnetic material such as glass, ceramic or ferrite, and the coil 6 is made of Cu or A.
A conductive material such as 1, Au or Ti is used, and the lower magnetic layer 2 and the upper magnetic layer 4 are made of a permalloy-based metal,
A magnetic material such as a sendust-based metal or a CoZr-based amorphous material was used. The material of the conductor 7 is the same as that of the coil 6.

Two magnetic contact protrusions 3 for magnetically coupling the lower magnetic layer 2 and the upper magnetic layer 4 are formed per track. As described above, the coils 6 are formed around each of them as a center. There is. In addition, the upper magnetic layer 4 is
A head half formed by forming the upper magnetic layer 4 by a thin film process on the protective plate 9 is butt-joined by a mounting process, or the upper magnetic layer 4 and Is formed by a thin film process and is formed into a predetermined shape by a photolithography technique.

Since the magnetic head of the embodiment is constructed as described above, the number of turns of the coil 6 can be increased without increasing the coil resistance. Further, although the number of turns of the coil 6 is increased, the increase in the magnetic path length of the upper and lower magnetic layers 4 and 2 can be suppressed to the minimum. Furthermore, since the step over the magnetic layer does not increase, the step coverage is not deteriorated.
Therefore, the soft magnetic characteristics are not impaired by the disorder of crystal growth and the concentration of stress when the magnetic layer is formed.

FIG. 2 shows another embodiment of the present invention. Figure 1
The same or corresponding parts are designated by the same reference numerals, and the description thereof will be omitted.

This embodiment differs from the embodiment of FIG. 1 in the positional relationship between the protrusion 8 corresponding to the track width and the magnetic contact protrusions 3a and 3b. That is, as is clear from comparison between FIG. 1 and FIG. 2, in this embodiment, as shown in FIG. 2, the protrusion 8 corresponding to the track width and the magnetic contact protrusion 3a are on the same center line C ₁ The magnetic contact protrusion 3a and the magnetic contact protrusion 3b are also formed on the same center line C ₂ .

Therefore, in the case of this embodiment, the convex portion 8
There is more freedom in the method for forming the. Therefore, the convex portion 8 can be formed by a method such as machining or etching, and a highly productive processing method such as cutting by a mounting process can be used. The function and effect are the same as in the case of the embodiment shown in FIG.

In each of the above-described embodiments, the protrusion 8 corresponding to the track width and the magnetic contact protrusion 3 for magnetic coupling are formed in a trapezoidal shape. It goes without saying that the shape may vary depending on the etching technique and the mounting process technique and may vary depending on the manufacturing method.

Further, in each of the above-mentioned embodiments, the magnetic contact convex portions 3 for the purpose of magnetic coupling are formed at two places, but the number and arrangement are not limited to those shown in FIGS. Absent. Of course, you may change to a more optimal number and arrangement.

Further, in each of the above-mentioned embodiments, the coil 6 formed with the magnetic contact protrusion 3 as the center.
Is formed as 3 turns, and the central portion of each coil 6 is connected by the conductor 7 to form a coil. The shape and connection method differ depending on the number and arrangement of the magnetic contact protrusions, and the shape changes depending on the manufacturing method. Of course you can.

[0025]

As is apparent from the above description, according to the present invention, at least two magnetic contact portions for magnetically coupling the upper magnetic layer and the lower magnetic layer are provided, and each magnetic contact portion is centered. Since the coil is formed around it, the following effects can be obtained.

(1) Although the number of turns of the coil is increased, the increase in the magnetic path length of the magnetic layer or the like is suppressed, and the magnetic efficiency is improved.

(2) Although the number of turns of the coil is increased, the increase of the coil resistance is small, so that the generation of impedance noise is suppressed and the S / N ratio is improved.

(3) Although the number of turns of the coil is increased, the layer thickness of the coil is not increased, and the dimension of the step over the magnetic layer or the like is not changed. Therefore, the step coverage of the magnetic layer at the step portion is not deteriorated, the crystal growth is not disturbed during the film formation, the stress is not concentrated, and the soft magnetic characteristics are not deteriorated.

(4) The area of the magnetic contact portion increases,
Magnetic saturation hardly occurs.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a perspective view of another embodiment.

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

[Explanation of symbols]

 1 substrate 2 lower magnetic layer 3, 3a, 3b magnetic contact convex portion 4 upper magnetic layer 5 magnetic gap 6 coil 7 conductor 8 convex portion corresponding to track width 9 protective plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fujihiro Ito 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (1)

[Claims] 1. A magnetic contact portion for magnetically connecting both upper and lower magnetic layers to at least two magnetic layers.
A magnetic head characterized in that one coil is provided and a coil is formed around each magnetic contact portion.