JPS62222412A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To prevent deterioration in an S/N in a recording/reproducing time, and to obtain a recording/reproduction with high accuracy, by giving an azimuth against a magnetic gap on a boundary plane between a magnetic body in which the magnetic gap is formed, and a magnetic material that forms a core. CONSTITUTION:First of all, 'Sendust(R)' layers 17a and 17b are formed on core half body blocks 16a and 16b, and the planes of them are polished making angles of psi, and the half body 16b is joined to the half body 16a by forming a nonmagnetic material 19 having a gap thickness, and track grooves 21 are processed, and a head whose gap plane is inclined in an angle of theta, can be obtained by slicing the grooves with the angle of theta against a reference plane. Since the layers 17a and 17b are inclined in the angle of psi, the head having the azimuth of theta can be obtained by polishing the gap plane in the direction of a track width. Therefore, the deterioration in the S/N is not generated in the recording/reproducing time, even when a spurious gap function is generated at the boundary plane, and since a gap part is put in a highly saturated density state, the recording/reproduction with high density can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic head suitable for a magnetic recording medium with high coercive force.

(Prior art) Conventionally, in high-density recording, head saturation during recording has been a problem.For example, ferrite etc. have an advantage in terms of wear resistance, but have the disadvantage of a low saturation magnetic flux density. Although alloy-based magnetic materials such as Sendust have a high saturation magnetic flux density, they have a disadvantage in that they are inferior in wear resistance.

Therefore, in order to compensate for the disadvantages of using ferrite materials alone, a composite magnetic head 1 shown in FIG. 6 was formed as a magnetic head that performs high-density recording by mutually utilizing the advantages of ferrite and sendust. The structure consists of a pair of core halves 1a made of a magnetic material such as ferrite.
, 1b, metal magnetic layers 2a and 2b made of Sendust or the like with a high saturation density are formed, and the core halves 1a and 1b are bonded to each other to create a recording/reproducing material made of Sendust 1- or the like with a high saturation density. It was configured to have a magnetic gap 3. Here, 4 is a winding opening, 5a and 5b are core half bodies 1a,
1b and the gold Ftuta bodies 12a and 2b.

(Problems to be Solved by the Invention) Therefore, in the above-described composite magnetic head 1, the metal magnetic layer 2a is made of a highly saturated magnetic material such as sendust in the gear 17 where the magnetic flux density is highest during recording.

By using a ferrite material having a relatively low saturation density but high magnetic permeability for the core halves 1a and lb, a magnetic head with good recording/reproducing characteristics and anti-wear characteristics can be obtained.

However, in this conventional composite magnetic head 1, for the gap 3, a metal magnetic layer 2a of highly saturated magnetic material,
Since the boundary surfaces 5a and 5b of 2b are formed in parallel,
A problem has arisen in that the boundary surfaces 5a and 5b act as a pseudo gap, deteriorating the S/N ratio of the signal.

The present invention provides 631. It was invented for the purpose of preventing the pseudo-gift V-tube effect, and as a means to do so, a metal magnetic material with a higher saturation magnetic flux density than the magnetic material constituting the core half is placed on the 1=near-tube side of the core half. The metallic magnetic material forms a magnetic gap, and the interface between the metallic magnetic material forming the magnetic gap and the magnetic material constituting the core is arranged such that one side is aligned in the track width direction with respect to the magnetic gap. The azimuth angle is such that one side is wide and the other side is narrow.

(Function) By providing an azimuth angle on the boundary surface of the metal magnetic layer with respect to the magnetic gap, the boundary surface is prevented from becoming a pseudo gap and picking up the signal with respect to the recording/reproducing signal.
The S/N ratio is improved.

(Example) Hereinafter, the present invention will be explained based on the drawings.

FIGS. 1(a) and 1(b) are a perspective view and an enlarged plan view of essential parts of a magnetic head according to an embodiment of the present invention. In the figures, a magnetic head 10 has a pair of cores made of ferrite or the like. Half body 118.11b and gold Ii made of highly saturated magnetic material such as sendust on the gap side! magnetic material ff112
a and 12b are arranged by sputtering or the like to form a magnetic gap 13 for recording and reproduction.
.

As shown in the enlarged view of the main part of FIG. 15B, the components 15b are configured to have an azimuth angle with each other at an angle a. Here 1
A slider 4 holds the chip-shaped magnetic head 10 and slides into contact with the recording medium.

Next, a method for manufacturing a magnetic head according to the present invention is shown in FIGS. 2(a), (b), (c), (d), and (e).

The following will explain each process in (g) and (g) based on perspective views.

First, as shown in FIG. 2(a), core half blocks 16a and 16b made of ferrite or the like are each processed into a predetermined shape so that the gap forming surface becomes an inclined surface, and the inclined surfaces are mirror-polished, and the polished surface is Then, sendust layers 17a and 17b are formed by sputtering.

Next, as shown in the same figure (b), the sendust layers 17a, 1
7b as the core half block 16a.

The back core portions 18a and 18b of the back core portions 16b are polished to form gap facing surfaces of the sendust layers 17a and 17b.

Next, as shown in the same figure (c), the core half block 16a
A non-magnetic material 19 such as $02, which serves as a gap spacer, is formed on the gap forming surface by sputtering to the thickness of the gap.

Next, as shown in the same figure (d), the core half block 16a
, 16b are joined with glass with their gap forming surfaces facing each other to form a magnetic head block 20 having a gap 13.

Next, as shown in FIG.
0, a track groove 21 is machined, and a depth reference plane 22 is machined and formed on the lower surface of the magnetic head block 20.

Next, as shown in the same figure (c), the track groove 21 is
and a magnetic head block 20 with a depth reference surface 22 formed thereon.
are sliced at an angle θ with respect to the perpendicular direction of the track groove 22 to form a chip-shaped magnetic head 10 in which the surface of the gap 13 is inclined by θ degrees with respect to the depth reference plane 22.

Next, as shown in (g) in the same figure, a chip-shaped magnetic head 1 is
Sliders 14a and 14b are bonded to glass on both sides of 0,
The gap surface is polished using the depth reference surface 22 as a reference.

At this time, the chip-shaped magnetic head 10 is formed in a predetermined track, and the sendust layers 17a and 17b constituting the gap 13 are formed in an inclined shape at an angle ψ so that the sendust layers 17a and 17b are thicker on the outside of the gap and thinner on the tip. Therefore, by polishing the gap forming surface by ω1 in the track width direction, the magnetic metal JM12a becomes the sendust layer 178°17b.
The magnetic head 10 is formed at the boundary surfaces 15a and 15b between the ferrite material of the core halves 12b and the ferrite material of the core halves 11a and 11b, with an azimuth angle of an angle a relative to the gap 13.

In another embodiment of the present invention, as shown in the cross-sectional view of FIG.
A chip-shaped magnetic head 30 is sliced in the direction perpendicular to i 21 to form a chip-shaped magnetic head 30 with both side surfaces parallel to each other,
This chip-shaped magnetic head 30 is attached to the sliders 14a, 14.
An azimuth angle can be provided at the boundary surface by joining the parts so as to hold them diagonally at b, and by polishing the gap part.

(Effects of the Invention) Therefore, as explained above, the magnetic head according to the present invention has an interface between the ferrite material 9 constituting the core half and the metal magnetic layer such as sendust constituting the gap portion. Since the azimuth angle is set to a different number with respect to the gap, even if a pseudo gap effect occurs at the interface, deterioration of the S/N ratio during recording and reproduction is prevented, and the gap part
Due to its high saturation density! l! This has the effect of facilitating high-density recording and reproduction such as direct magnetic recording.

[Brief explanation of drawings]

FIGS. 1A and 1B are perspective views and enlarged views of essential parts of an embodiment of the present invention, and FIGS. 2A and 2B. (C), (D), (E), (F), and (G) are process perspective views and cross-sectional views showing the manufacturing process of the present invention, and FIG. 3 is a cross-sectional view showing another embodiment of the present invention. 4 are plan views thereof, and FIG. 5 is a perspective view showing a conventional example. DESCRIPTION OF SYMBOLS 10... Magnetic head, 11a, 11b... Core half, 12a, 12b... Metal magnetic layer, 13... Gap, 14... Slider, 15a, 15b... Boundary surface. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Procedure (Method) % Formula % 2. Title of invention... Air head and its manufacturing method 3. Relationship with the person making the amendment Patent Applicant address: 1-7 Yukitani Otsuka-cho, Ota-ku, Tokyo 145 Name
AO9 Alps Electric Co., Ltd. May 7, 1986 (shipment date May 27, 1986) 5. Subject of amendment Drawing 6. Contents of amendment

Claims (2)

[Claims] (1) A magnetic material having a higher saturation magnetic flux density than the magnetic material constituting the core half is arranged on the gap side of the core half, and the magnetic material forms a magnetic gap. A magnetic head characterized in that an interface between the magnetic material and a magnetic material constituting the core is formed to have an azimuth angle with respect to a magnetic gap. (2) forming the gap side of the core half into an inclined mirror surface, and forming the core half on the inclined mirror surface so that the outer side of the core half is thicker and the inner side thereof is thinner; and then, on one of the core halves. A step of forming a non-magnetic material to serve as a gap spacer by sputtering or the like, a step of forming a magnetic head chip from a magnetic head block, and a step of polishing the gap surface of the magnetic head chip diagonally in the track width direction. A method for manufacturing a magnetic head, comprising manufacturing a magnetic head having an azimuth angle at the interface between the magnetic material and the magnetic material constituting the core half.