JPH05325128A - Magnetic head element - Google Patents

Abstract

PURPOSE:To provide a magnetic head element in which a low impedance is achieved with no trouble in handling while ensuring a yield higher than a predetermined level. CONSTITUTION:The magnetic head element 2 comprises a first magnetic core member 201, a second magnetic-core member 202, a gap member 203 for bonding the magnetic core members 201, 202, and magnetic thin film layers 204, 205 interposed between the gap member and at least one of the magnetic core members. Magnetic oxide members 201b, 202b are bonded with nonmagnetic members 201a, 202a in at least one of the magnetic core members 201, 202.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a magnetic head element, and more particularly to a metal-in-gap type magnetic head element having a magnetic thin film layer between a magnetic core member and a gap member.

[0002]

2. Description of the Related Art Conventionally, a metal-in-gap type magnetic head element includes, as shown in FIG. 14, a first magnetic core member 101 having an approximately I shape and a second magnetic core member 102 having an approximately C shape. A gap member 103 disposed between the magnetic core members 101 and 102 and joining the core members 101 and 102, and the gap member 103 and the core members 10.
A magnetic thin film layer 104 disposed between 1 and 102,
And 105.

Here, the first magnetic core member 101 and the second magnetic core member 101
The magnetic core member 102 is composed of a magnetic oxide such as Mn-Zn ferrite.

[0004]

In recent years, with the increase in capacity of magnetic recording / reproducing devices, the operating frequency of the magnetic head has tended to rise, and as a result, it is necessary to improve the resonance frequency, and the low inductance of the magnetic head is required. Is required.

The inductance of the magnetic head is comprehensively determined by the number of windings of the wire, the magnetic permeability of the magnetic core material, the core thickness, the total inner peripheral length and the outer peripheral total length of the magnetic ring, the gap length, the gap depth and the like. However, when designing the magnetic head, the gap length, the gap depth, the magnetic permeability of the core material, etc. are limited in terms of electromagnetic conversion characteristics.
Therefore, it is common to determine the number of wire turns to obtain the desired inductance while changing the core shape such as the core thickness, the inner peripheral length of the magnetic ring, the outer peripheral length, etc. To reduce the inductance,
The shape may be changed as follows.

The core thickness is reduced.

The outer peripheral length of the core is shortened to reduce the size of the core.

The ratio of the total inner peripheral length to the total outer peripheral length of the core is made as large as possible.

When the shape of the core is determined as described above, the core is inevitably small and becomes brittle, and the yield is greatly reduced in the processing step, and the handling is hindered. There is a point. In view of the above-mentioned problems, the present invention provides a magnetic head element that can secure a yield of a predetermined value or more and further achieve low inductance without causing any trouble in handling. is there.

[0010]

A magnetic head element according to the present invention comprises a first magnetic core member, a second magnetic core member arranged to face the first magnetic core member, and the first magnetic core member. A gap member arranged between the magnetic core member and the second magnetic core member and for joining the two magnetic core members, and a magnetic thin film layer arranged between at least one of the magnetic core members and the gap member. In the magnetic head element including, at least one of the magnetic core members is formed by joining a magnetic oxide member and a non-magnetic member. Further, it is preferable that the total outer peripheral length of both magnetic core members constituting the magnetic head element is not more than twice the total inner peripheral length of the winding window.

[0011]

In the magnetic head element of the present invention, the non-magnetic member is formed on at least one of the magnetic core members so as to compensate for the decrease in the rigidity of the magnetic core member. Without changing the overall shape of the core that affects the handling, the outer peripheral length of the magnetic ring can be substantially shortened, and low inductance can be achieved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic head element of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a magnetic head device using the magnetic head element of the present invention, and FIG. 2 is a perspective view of the magnetic head element. The magnetic head element shown in FIG. 2 is shown upside down with respect to the magnetic head element shown in FIG.

The magnetic head device comprises a slider 1, a magnetic head element 2 and a support arm 17.

The slider 1 is made of high-hardness ceramic such as calcium titanate and has a substantially rectangular parallelepiped shape. A plurality of levitation rails 11 and 12 are formed on the lower surface (recording medium side) in the figure. A core slit 13 extending in the longitudinal direction and a winding slot 14 orthogonal to the core slit 13 are formed at the tip of the slider 1. The magnetic head element 2 is attached to the core slit 13 via a joining member 15. A coil winding 16 is wound around the magnetic head element 2 a predetermined number of times.

The support arm 17 is fixed to the upper surface of the slider 1 (the surface opposite to the surface on the recording medium side) so that a predetermined load force is applied to the slider 1 toward the recording medium side.

The magnetic head element 2 includes the first magnetic core member 2
01, the second magnetic core member 202, and the two magnetic core members 2
And a gap member 203 that integrates 01 and 202,
The magnetic thin film layers 204 and 205 arranged between the magnetic core members 201 and 202 and the gap member 203 are mainly provided.

The first magnetic core member 201 has a vertical cross-sectional shape that is generally I-shaped, and is made of non-magnetic member 201 such as crystallized glass.
a is joined to a magnetic oxide member 201b such as ferrite. The nonmagnetic member 201a is joined to the surface opposite to the side on which the gap member 203 is formed. Further, this joining is performed via an adhesive 201c such as glass.

The second magnetic core member 202 has a substantially C-shaped longitudinal section for forming a winding window 210 for winding, and like the first core member 201, the non-magnetic member 202a.
And the magnetic oxide member 202b are joined together. The non-magnetic member 202a is joined to the surface opposite to the side where the gap member 203 is formed via an adhesive 202c such as glass.

The first core member 201 and the second core member 202
By joining with, the winding window 210 is formed, the front gap FG is formed on the upper surface side in the figure, and the back gap BG is formed on the lower side in the figure. Further, the magnetic core members 201 and 202 are provided with projections 207 and 208 for restricting the track width on the upper surface side in the drawing, respectively. Further, the second magnetic core member 202 is formed with a notch 211 extending from the surface facing the first magnetic core member 201 to the winding groove 210, and the joining of the both magnetic core members 201, 202 to this portion. It is filled with lead glass 209 for reinforcement.

The gap member 203 is formed of a single substance or a laminated body of a non-magnetic oxide such as silicon dioxide or lead glass. In addition, the gap member 203 and both magnetic core members 20
The magnetic metal thin film layers 204 and 205 having high saturation magnetic flux density are provided between the magnetic oxide members 201b and 202b.
Are formed.

In the present invention, the magnetic oxide member 201
b, 202b, the total length of the outer circumferences of the magnetic oxide members 201b, 202b is reduced to reduce the inductance.
Although the width W of b is shortened, it goes without saying that the magnetic oxide member 20
The rigidity of 1b and 202b will fall. However, both magnetic core members 201, 202 are magnetic oxide members 201b,
Since it is a composite of 202b and the non-magnetic members 201a, 202a, the rigidity of the magnetic head element 2 can be maintained,
It does not impair handleability. That is, the magnetic head element 2
By making the external dimensions of the same as the conventional one, it is possible to achieve the magnetic head element 2 of low inductance which is easy to handle and is not damaged.

Next, a method of manufacturing the magnetic head element 2 will be described with reference to FIGS.

First, as shown in FIG. 3, a non-magnetic substrate base material 30 for the non-magnetic member 201a of the first magnetic core member 201.
1a and the non-magnetic member 202a of the second magnetic core member 202
A non-magnetic substrate base material 302a for use is prepared. As the non-magnetic substrate base materials 301a and 302a, crystallized glass or a ceramic material such as calcium titanate may be used.

Next, as shown in FIG. 4, adhesives 301c and 302 are formed on the surfaces of the non-magnetic substrate base materials 301a and 302a.
After forming c, the magnetic oxide base materials 301b and 302b to be the magnetic oxide members 201b and 202b are bonded to the non-magnetic substrate base materials 301a and 302a. Magnetic oxide base material 30
As 1b and 302b, Mn-Zn ferrite or the like may be used. As a method of forming the adhesives 301c and 302c, a material such as glass may be formed into a thin film or powdered and applied on the surface. The non-magnetic substrate base materials 301a and 302a and the magnetic oxide base materials 301b and 302b are overlapped via the adhesives 301c and 302c and heated to a temperature equal to or higher than the melting point of the glass material while being pressed and held from both sides. By doing so, strong adhesion can be easily achieved.

Next, as shown in FIG. 5, the magnetic oxide base materials 301b and 302b are processed into a predetermined shape. Here, first, the thickness of the magnetic oxide base material 301b is reduced, and the surface is accurately and smoothly finished. Further, the magnetic oxide base material 302b has a winding groove 31 that becomes the winding window 210.
After a plurality of slopes 011 and slopes 311 to be the cutouts 211 are formed, the surface is finished accurately and smoothly.

In this state, by slicing as shown by alternate long and short dashed lines X ₁ and X ₂ , as shown in FIG. 6, a first magnetic core base material 301 and a second magnetic core base material 302 are formed.

Next, as shown in FIG. 7, magnetic metal thin film thin film layers 304, 3 are formed on the magnetic oxide base materials 301b, 302b.
05 and the glass layer 303 to be the gap member 203 are formed. Although not described in detail here, the gap glass layer 303 has a single layer or a laminated structure made of silicon oxide, lead glass or the like. A material having a high saturation magnetic flux density such as sendust is used for the magnetic metal thin film layers 304 and 305. The above processing procedure can be changed in order, and is not limited to this processing procedure.
Magnetic thin film layers 304 and 305 and gap glass layer 303
May be performed before the slice shown in FIG.

Then, as shown in FIG. 8, the first magnetic core base material 301 and the second magnetic core base material 302 are brought into contact with each other and heated under pressure to form a gap glass layer 303. The low melting point glass contained is melted and both are joined. At this time, the slope 31 of the second magnetic core base material 302
If a low-melting glass rod 309 is arranged on the first melting point, the low-melting glass melts at the time of heating, and the slope portion 311 is filled. As a result, the coupling between the two magnetic core base materials 301 and 302 becomes stronger. In the figure,
For convenience of display, the upper and lower sides of the base material shown in FIGS. 3 to 7 are reversed.

Next, as shown in FIG. 9, the outer periphery of the combined body of the first magnetic core base material 301 and the second magnetic core base material 302 is processed into a predetermined shape by grinding, polishing, etc., and further, The magnetic head element base material 20 shown in FIG. 10 is obtained by slicing as shown by alternate long and short dashed lines Y and Z. By processing the magnetic head element base material 20 to form the protrusions 207 and 208 shown in FIG. 2, the magnetic head element 2 shown in FIG. 2 is obtained.

In the magnetic head element 2 completed through the above steps, the magnetic oxide members 201b, 2b that contribute to electromagnetic conversion without reducing the overall shape of the element.
Since only 02b can be reduced, the size can be substantially reduced without reducing the yield.

Further, the inventors of the present invention made various trials with the above-described magnetic head element, and found that the ring-shaped outer peripheral length L ₁ of the magnetic oxide members 201b and 202b of the element and the winding window 210. It has been found that the inductance can be remarkably reduced due to the relationship of the inner peripheral total length L ₂ of the. FIG. 13 shows the characteristic result. That is, it was found that when the ratio of the outer peripheral total length and the inner peripheral total length (L ₁ / L ₂ ) was smaller than 2, the inductance was remarkably reduced.

(Other Embodiments) (a) In the above embodiments, the first magnetic core member 201 has a substantially I shape, but the present invention is not limited to this. For example, as shown in FIG. 11, a substantially C-shaped first magnetic core member 40.
1 is used. By doing so, since the recess 410 is formed on the surface forming the winding window 210, the magnetic oxide member 4 can be formed.
The inner peripheral total length L _{2 of} 01b and 202b is further increased, and a magnetic head element with lower inductance is achieved.

(B) Further, as shown in FIG. 12, the magnetic oxide members 201b and 202 are provided on the back gap BG side.
By providing the recesses 501 and 502 having a width of b or more,
The total length L of the outer circumference of the magnetic oxide members 201b and 202b
₁ is shortened, and the same effect as described above can be obtained.
At this time, the recess may be filled with a non-magnetic low melting point glass for reinforcement.

[0035]

As described above, the magnetic head element of the present invention has a composite structure of a magnetic oxide member and a non-magnetic member, and the outer peripheral length of the magnetic oxide members of both magnetic cores is shortened. A low inductance magnetic head element is achieved.

Further, even if the shape of the magnetic portion is reduced for the purpose of reducing the inductance, since the non-magnetic member is joined, sufficient strength can be maintained without reducing the overall shape of the magnetic head core. It can be manufactured with stable yield while maintaining handleability.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head device using a magnetic head element of the present invention.

FIG. 2 is a perspective view of a magnetic head element of the present invention.

FIG. 3 is a perspective view of one step of the process of manufacturing the magnetic head element of the present invention.

FIG. 4 is a perspective view of one step of the manufacturing process of the magnetic head element of the present invention.

FIG. 5 is a perspective view of one step of the manufacturing process of the magnetic head element of the present invention.

FIG. 6 is a perspective view of one step of the manufacturing process of the magnetic head element of the present invention.

FIG. 7 is a perspective view of one step of the manufacturing process of the magnetic head element of the present invention.

FIG. 8 is a perspective view of a step of manufacturing the magnetic head element of the present invention.

FIG. 9 is a perspective view of one step of the manufacturing process of the magnetic head element of the present invention.

FIG. 10 is a perspective view of one step of the manufacturing process of the magnetic head element of the present invention.

FIG. 11 is a perspective view showing another embodiment of the present invention.

FIG. 12 is a perspective view showing another embodiment of the present invention.

FIG. 13 is a characteristic diagram showing the relationship between the ratio of the outer peripheral length to the inner peripheral length and the output and the inductance according to the magnetic head element of the present invention.

FIG. 14 is a perspective view of a conventional magnetic head element.

[Explanation of symbols]

 1 ... Slider 2 ... Magnetic head element 11, 12 ... Flying rail 13 ... Core slit 14 ... Winding slot 17 ... Support arm 201 ... First magnetic core member 202・ ・ ・ Second magnetic core member 203 ・ ・ ・ Gap member 204, 205 ・ ・ ・ Magnetic thin film layer 201a, 202a ・ ・ ・ Non-magnetic member 201b, 202b ・ ・ ・ Magnetic oxide member 203 ・ ・ ・ Gap member FG ・..Front gap BG ... Back gap

Claims (2)

[Claims] 1. A first magnetic core member, a second magnetic core member arranged to face the first magnetic core member, and arranged between the first magnetic core member and the second magnetic core member. And a magnetic thin film layer disposed between at least one of the magnetic core members and the gap member, the magnetic core element comprising: At least one of the members is formed by joining a magnetic oxide member and a non-magnetic member to each other. 2. The magnetic head element has a winding window, and the total length of the outer circumferences of the non-magnetic members of both magnetic core members is
2. The magnetic head element according to claim 1, wherein the total length of the inner circumference of the winding window is twice or less.