JPH06223317A - Laminate type magnetic head and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a laminate type magnetic head with a suppressed drop in efficiency by providing an auxiliary core at a specified part of a head to prevent a drop in output with respect to a designing of a less thickness. CONSTITUTION:A magnetic core 2 is formed having a metal magnetic film sandwiched between non-magnetic substrates. On the other hand, an auxiliary core 12 is provided between a coil-wound window 7 and the rear surface of a head. The core 12 allows the preventing possible drop in efficiency of a backing cap. Thus, the drop in output is prevented even with a less thickness to check the drop in the efficiency thereby producing a laminate type magnetic head with a higher output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing device used for an external storage device of a computer, and more particularly to a laminated magnetic head used for a fixed magnetic disk device and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a conventional magnetic head, a magnetic core is manufactured by grinding or lapping a magnetic material such as ferrite or a metallic magnetic material, and a winding window is formed on the magnetic core to form a magnetic gap. It was formed and adhered to form a magnetic head.

However, the linear recording density and the areal recording density are required to be improved with the recent miniaturization and higher capacity of external storage devices for computers and VTRs. In order to achieve this, the recording medium has a high coercive force, which makes it possible to improve the output of recording and reproducing signals at short wavelengths.

On the other hand, there has been proposed a technique for forming a magnetic core of a magnetic head with a metal magnetic material having a high saturation magnetic flux density. For example, a magnetic metal block having a sufficiently high saturation magnetic flux and an insulator such as SiO ₂ are formed into thin films by a method such as sputtering or vapor deposition and alternately laminated, and a magnetic core block is formed by sandwiching both surfaces thereof with a non-magnetic substrate. An example is a laminated magnetic head in which a magnetic core is manufactured from blocks. less than,
A conventional example of a laminated magnetic head and a method of manufacturing the same will be described with reference to FIGS.

As shown in FIG. 8A, the magnetic core 2 is formed on the non-magnetic substrate 1a. As shown in the enlarged view on the right side of (a), this magnetic core is made of a metal magnetic material such as Sendust alloy, amorphous magnetic alloy, or permalloy magnetic alloy having a high saturation magnetic flux density and a high magnetic permeability. First
The layer 3a and the insulator first layer 4a as the insulator 4 such as SiO ₂ and Al ₂ O ₃ are sequentially deposited by the sputtering method, and thereafter, the metal magnetic second layer 3b and the insulator second layer are formed. 4b, the metallic magnetic third layer 3c, and the insulating third layer 4c are repeatedly deposited to form the magnetic core 2.

Next, as shown in FIG. 8 (b), a non-magnetic substrate 1b as a reinforcing material is formed as shown in the enlarged view on the right side of FIG. 8 (b).
The magnetic core block 6 is manufactured by adhering to the third insulator layer 4c with the adhesive glass 5. Next, as shown in FIG. 8C, the magnetic core block 6 is cut and separated so as to be orthogonal to the laminated film (arrow AA), and one of the cut and separated blocks 6 is cut.
A coil winding groove (which will later form a coil winding window) 7 is formed in at least one block of the non-magnetic substrates 1a and 1b of a and 6b by grinding. After that, the facing surface 8 is mirror-finished by lapping or the like.

A gap material 9 such as SiO _{2 is} formed thereon by a sputtering method or the like, as shown in FIG. 9 (a).
Then, as shown in FIG. 9 (b), the bonding glass 10
The non-magnetic substrate is adhered while welding. After that, it was a manufacturing method in which the magnetic head was regulated to have a shape and a gap depth according to the application.

FIG. 10 is a perspective view of a floating type laminated magnetic head used for a hard disk as an example, which is manufactured by the above manufacturing method. Since the magnetic core 2 of the laminated magnetic head is composed of the metal magnetic film 3 having a high saturation magnetic flux density and a high magnetic permeability, it is possible to reduce the change in the magnetic permeability in the high frequency region and reduce the inductance as compared with the conventional magnetic head. Further, by increasing the saturation magnetic flux density of the metal magnetic film 3, it is possible to cope with recording on a high coercive force medium, and by utilizing the excellent characteristics of the metal magnetic film, many advantages can be expected as compared with the conventional magnetic head. .

[0009]

As described above, due to the recent demand for higher density and higher capacity, the magnetic head is becoming narrower in track and smaller in size. As an example of the flow of a floating magnetic head used for a hard disk drive, the total height is 0.86 mm called a micro slider, and in recent years, the total height is 0.43 mm called a 50% slider.
The size is getting smaller and thinner.

The magnetic head is classified into a type in which a coil is formed by a photolithography technique such as a thin film type magnetic head and a type in which a winding window is formed by machining to wind a coil wire. Stacked magnetic heads fall into the latter category. This type requires a winding window of a certain size for winding. In that case, if the laminated magnetic head is made thinner, the dimensions of the winding window must be secured to some extent regardless of the thinning of the magnetic head. The so-called gap) becomes very short.

When the back gap becomes smaller, it becomes difficult for the magnetic flux in the portion between the winding window and the back surface of the magnetic head to pass,
This causes a decrease in the efficiency of the magnetic core. FIG. 6 shows data in which the size of the winding window of the laminated magnetic head, the number of coil windings, and the width of the magnetic core are the same and the length of the back gap is changed. The output when the back depth was 0.3 mm was set to 1.0 and the relative output was taken. In the figure, the B curve shows the output characteristics of the conventional stacked magnetic head, the cross-sectional area of the magnetic core is significantly smaller than that of the ferrite type magnetic head, and thinning the back gap may lead to a particularly large reduction in efficiency. Recognize.

The present invention solves these conventional problems,
An object of the present invention is to provide a laminated magnetic head having high output.

[0013]

A laminated magnetic head according to the present invention is provided between a winding window of a laminated magnetic head in which a metal magnetic film is sandwiched between non-magnetic substrates to form a magnetic core, and a head back surface. It is characterized in that an auxiliary core is provided in the.

Further, according to the method of manufacturing a laminated magnetic head of the present invention, a pair of magnetic cores of a laminated magnetic head in which a metal magnetic film is sandwiched between non-magnetic substrates to form a magnetic core is adhered to the back surface of the head. A groove is formed between the head winding window, and then a metal magnetic film is film-filled and filled inside the groove by a method such as sputtering or vapor deposition to form an auxiliary core.

[0015]

In the laminated magnetic head of the present invention, the auxiliary core is provided between the head winding window and the back surface of the head, so that the efficiency of the magnetic core in the back gap can be prevented from decreasing and the output can be increased.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated magnetic head according to an embodiment of the present invention and a method of manufacturing the same will be described with reference to FIGS. 8 to 9 and 1 to 7 of the conventional example.

During the manufacturing process of this embodiment, FIGS. 8 to 9 described in the conventional example are the same.

After that, in the conventional example, the head is finished in a predetermined shape while restricting the depths of both the back and the front.
For example, if the slider size is 50% of the floating magnetic head, the back gap length is about 0.1 mm.

In the laminated magnetic head of the present invention, the auxiliary core 12 (see FIG. 2) is provided in the back gap from the state of FIG. 9 (b) by the following method in order to prevent the efficiency of the back gap from decreasing. First, as shown in FIG. 1A, the groove 11 is processed from the back surface of the head in parallel with the magnetic film to be the magnetic core 2 to a depth that does not reach the winding window 7. An enlarged view of the winding window 7 and the groove 11 is shown on the right side of FIG. The width 11a of the groove 11 is narrower than the entire width of the head finished product and wider than the width 2a of the magnetic core 2. Further, the groove 11 may be processed so as to be orthogonal to the magnetic core 2 as shown in FIG. Also in this case, the depth of the groove is formed between the back surface of the head and the winding window 7, and the width of the groove is shorter than the total length of the head finished product.

Next, after forming the groove 11, as shown in FIG.
A magnetic film forming the auxiliary core 12 is formed on the back surface of the head by a method such as sputtering or vapor deposition, and the magnetic film is filled. Amorphous alloy or the like is used as the magnetic film, and the film thickness is about 0.01 mm to 0.03 mm. After that, the excess magnetic film attached to the back surface of the head is removed by grinding or the like.

Thereafter, as shown in FIG. 2B, the depths of both the back and the front are regulated in the same manner as in the conventional example, and a predetermined shape is formed. FIG. 3 shows a floating type stacked magnetic head as an example. FIG. 3 shows a method of forming the groove 11 of FIG. 1A, and FIG. 4 shows a method of forming the groove 11 of FIG. 1B. The perspective view of a head is shown.

In order to reduce the thickness of the magnetic head, the auxiliary core 12 is formed in the back gap, so that the efficiency of the magnetic core can be prevented from being lowered, and the back gap can be made thinner.

Also in the manufacturing method, usually, when a pair of magnetic cores are bonded together, a plurality of magnetic cores are present in one bar, so that the method of forming the groove 11 is the case of FIG. 1 (a). 1 parallel to the magnetic core 2 and the multi-grinding stone,
In the case of (b), it suffices to carry out processing with a grindstone once at right angles to the magnetic core 2, and the number of steps does not increase significantly.

Further, since the structure is such that the magnetic film forming the auxiliary core 12 is embedded by processing the groove 11, as compared with the structure in which the magnetic film 3'is directly attached to the back surface of the head as shown in FIG. And has excellent mechanical strength. Further, when other components are adhered to the back surface of the head, peeling of the film may occur in the structure shown in FIG. 5, but in the case of the present invention, the film is embedded, so there is a concern. There is no.

FIG. 6 shows a comparison between the laminated magnetic head according to the present embodiment and the laminated magnetic head according to the conventional example. The head output when the back gap of the conventional laminated magnetic head was changed and the output value of this embodiment were compared with each other with the same size of the winding window and the same number of turns.

A relative output curve B is drawn with an output of 1.0 when the head size is 2.3 mm × 1.6 mm, the back gap length is 0.3 mm, and the track width is 11 μm, and the laminated magnetic head according to this embodiment is drawn on this. Plot the value of (circle at point A)
did. In the conventional laminated magnetic head, as shown in the output curve B, when the back gap becomes short (for example, 0.1 m
m), the efficiency drops sharply. However, in the case of the laminated magnetic head of the present embodiment, as shown in the perspective view (1) of FIG. 7 and the enlarged view (2) of the winding window thereof, 0.03 mm is provided at a position 0.02 mm from the winding window 7. The auxiliary core 12 was formed with a thickness of an amorphous alloy. The cross-sectional area is the width 11a of the groove 11 = 0.75 mm × 2.00 mm (length of the magnetic core block 6). The length of the back gap was practically 0.05 mm, but when it was used as a head, it was 0.1 mm.

In fact, it is possible to make it 0.05 mm. High output is shown when the back gap is the same as the extrapolation line of the conventional example, and the decrease in efficiency is prevented.

[0028]

As described above, according to the present invention,
By providing the auxiliary core between the winding window of the laminated magnetic head and the back surface of the head, it is possible to prevent the efficiency of the magnetic core from decreasing when the laminated magnetic head is thinned, and it is possible to provide a laminated magnetic head with high output. .

[Brief description of drawings]

FIG. 1 is a perspective view and a partially enlarged view showing a method of manufacturing a laminated magnetic head according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a method of manufacturing a laminated magnetic head according to an embodiment of the present invention and a partially enlarged view thereof.

FIG. 3 is a perspective view of a floating stacked magnetic head manufactured by the groove-type manufacturing method of FIG.

FIG. 4 is a perspective view of a floating stacked magnetic head manufactured by the groove-type manufacturing method of FIG.

FIG. 5 is a perspective view of a laminated magnetic head in which a film is directly attached to the back surface of the head.

FIG. 6 is a diagram showing a comparison of output values of a laminated magnetic head of the present invention and a conventional example.

7A and 7B are a perspective view and a partially enlarged view showing respective dimensions of the laminated magnetic head according to the embodiment of the invention.

FIG. 8 is a diagram showing a method of manufacturing a laminated magnetic head according to a conventional example and the present invention.

FIG. 9 is a diagram showing a method of manufacturing a laminated magnetic head according to a conventional example and the present invention.

FIG. 10 is a perspective view of a floating magnetic head.

[Explanation of symbols]

1a, 1b ... Non-magnetic substrate, 2 ... Magnetic core, 3 ... Metal magnetic film, 4 ... Insulating film, 5 ... Adhesive glass, 6 ... Magnetic core block, 7 ... Coil winding groove (window), 8 ... Opposing surface,
9 ... Gap material, 10 ... Bonding glass, 11 ...
Groove, 12 ... Auxiliary core.

Claims (2)

[Claims] 1. A laminated type in which an auxiliary core is provided between a winding window of a laminated magnetic head in which a metal magnetic film is sandwiched between non-magnetic substrates to form a magnetic core and a head back surface. Magnetic head. 2. A pair of magnetic cores of a laminated magnetic head in which a metal magnetic film is sandwiched between non-magnetic substrates to form a magnetic core are bonded together, and then a groove is formed between the head back surface and the head winding window. A method of manufacturing a laminated magnetic head, characterized in that thereafter, a metal magnetic film is film-filled inside the groove by a method such as sputtering or vapor deposition to form an auxiliary core.