JPS59227014A - Magnetic head - Google Patents

Abstract

PURPOSE:To cause no magnetic deterioration in a core due to joining of the core and a reinforcing body, by placing the reinforcing body between amorphous magnetic thin film cores and fusion-bonding the reinforcing body and the thin film core into one body by a solder of a low melting point. CONSTITUTION:A reinforcing body is placed on both surfaces, of amorphous magnetic thin film cores 3a, 3b placed inbetween, and this thin film core and the reinforcing body are joined by a solder 7 of a solder a low melting point. The low melting solder whose melting point is 123 deg.C or 143 deg.C is used. In this case, if there is a problem in an adhesive property of this low melting point solder and the amorphous magnetic thin film core, or an dhesive peroperty of this low melting point solder and the reinforcing body, a material component of this thin film, for instance, a non-magnetic layer of a spatteringing film of Si, or a non-magnetic layer made by spattering, etc. of SiO2 is stuck to the surface of the thin film core, and in the reinforcing body side, too, an amorphous non- magnetic layer can be formed by spattering in the same way as necessary.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head suitable for application to a magnetic head for a VTR, and particularly to a magnetic head in which an amorphous magnetic thin film core is used as the soft magnetic core.

Background art and its problems Amorphous magnetic materials, such as (F'e, Co)-(St, 1
3) Amorphous alloys The so-called cobalt-based amorphous alloys have a high saturation magnetic flux density of 13s, a high magnetic permeability μ, and are particularly free of magnetostriction, so they are suitable for use as magnetic herad core materials. Magnetic heads made of such amorphous magnetic materials have recently been in the spotlight.

However, this amorphous magnetic alloy is produced in the form of a thin film by ordinary liquid cooling, sputtering, plating, etc., so when a magnetic head is constructed using this, the amorphous magnetic thin film is sandwiched and reinforced. The body is placed.

In this case, it is necessary to mechanically join the amorphous magnetic thin film core and the reinforcing body, but since the amorphous magnetic material has a crystallization temperature of 420°C to 520°C, such joining is not possible. If the material is subjected to heat treatment that is lower than the crystallization temperature, for example, by about 200°C, not to mention above the crystallization temperature, this will deteriorate the soft magnetic properties and deteriorate the abrasive properties. Come. Therefore, in this case, the amorphous thin film core and its reinforcing body are bonded using a bonding technique used in ordinary magnetic heads that requires relatively high heat treatment such as glass fusion. This is undesirable because it leads to deterioration of physical characteristics and knowledge.

Therefore, attempts have been made to bond the amorphous magnetic thin film core and the reinforcing body in such magnetic heads by fusing with low-temperature hardening glass.

However, even with this method, the processing temperature is not low enough, and this sometimes affects the magnetic properties of the amorphous magnetic thin film core.

OBJECTS OF THE INVENTION The present invention provides a head using the above-mentioned amorphous magnetic thin film core, which effectively eliminates the disadvantage of causing magnetic deterioration in the amorphous magnetic thin film core by bonding the core to the reinforcing body. It is possible to obtain a magnetic head that can be sewn, has a high yield, is highly reliable, and has excellent characteristics.

Summary of the Invention In the present invention, an amorphous magnetic thin film core is sandwiched and a reinforcing body is provided on both sides of the core. done by. This low melting point solder has a melting point of 12
A low melting point solder of 3°C or 143°C is used. In this case, the adhesiveness between this low melting point solder and the amorphous magnetic thin film core,
Furthermore, if there is a problem with the adhesion between this low melting point solder and the reinforcing body, apply this product to the surface of the amorphous magnetic thin film core.
Material components of the N magnetic thin film, for example, the non-magnetic layer based on the 8i snow ivy 1) ring coating, and the G ma Sζ 02 snow ivy 1
If necessary, apply an amorphous non-magnetic layer in the same manner as required.
Can be formed by ivy.

Embodiment An example of a magnetic head according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an enlarged front view of an example of a magnetic head according to the present invention;
Fig. 2 is an enlarged plan view thereof, Fig. 3 is an enlarged side view of the main body, and Fig. 4 is an exploded enlarged oblique view thereof.

In the figure, (1) shows the magnetic head of the present invention as a whole. This magnetic head consists of a pair of head blocks (2a) and (2a).
2b). Half-day off for each block (2a): (
2b) are half-core cores (3) each made of an amorphous magnetic thin film.
a) and (3b) are combined so that (3a) and (3b) are placed on the same plane on their negative end faces, and a magnetic force is created at their front ends. Force; each block halves (2a) and (2b) are bonded to each other, for example by low melting point solder, so as to form.

Each block half-hole (2a) and (2b) has an amorphous magnetic thin film core half-hole (3a) and (3b) made of a cobalt-based amorphous alloy of (Fe, Co)-(Si, B) system, respectively. Each core has half a break (3a) and (3b
A non-magnetic layer 14) such as S+02 containing Si or St as a constituent material of the thin film core is immersed on both sides of the thin film core by sputtering or the like to a thickness of several hundred to several thousand times. On the other hand, each block half-day (2a) and (
A pair of reinforcing bodies (5a1), (5a2), (5b1) are sandwiched between the thin film core half-holes (3a) and (3b) of 2b), respectively.
) (5bz), but these pairs of reinforcing bodies (5al) and (5a2), (5bl) and (5
bs+), a non-magnetic block body (6A) made of ceramic, for example, and a rear magnetic block body (6B) made of magnetic ferrite, etc., which ultimately form the contact surface with the magnetic medium, are made of high melting point glass. It is formed by fusion bonding with any fusion bond body such as. And between these pair of reinforcing bodies (5al) and (5a2), (Fibl) and (5
b2) Thin film core half-break between (3a) and (3b)? They are sandwiched together and fused together using low melting point solder (7). This low melting point solder (70-1, commercially available as mentioned above)
A solder material with a low melting point such as 123°C or 143°C is used.

By the way, the above-mentioned Konokuruto base amorphous thin core (3a)
The crystallization temperature of (3b) is 420°C to 520°C, and the above-mentioned melting point of the low melting point solder has a melting point lower than this by 200°C or more. This solder (7)
The soldering process is carried out at a temperature that is several times higher than the melting point of the solder 17) but as low as possible. Also, each pair of reinforcing bodies (5al) and (5az), (5b1)
The surfaces of (5b2) and (5b2) to be fused (soldered) with each other by the solder (7) are each coated with a material such as nickel-based amorphous (N1.Fe) that has excellent adhesion to the solder (7).
- An amorphous nonmagnetic layer (8) made of a (B, St) alloy is formed by snot tutting.

These blocks (2a) and (2b) are combined with the end faces of the cores (3a) and (3b) facing each other via a required spacer, but in this case, at least one of them is For example, a block (2a) is formed with a redundant winding insertion hole (9) facing the other block (2b) to regulate the gap depth of the magnetic gap g and this insertion hole (9)
Insert and wind o). Also, both blocks (2a) and (2
The front surface of the bonded body in b) is, for example, cylindrically polished to form a surface (1υ) in contact with the magnetic medium.

Effects of the Invention According to the magnetic head π of the present invention described above, the non-magnetic material (6A) and the magnetic material (6B) in the reinforcing body to be joined in advance can be joined by any glass such as high melting point glass. However, these and the amorphous magnetic thin film core half-break (3a)
When joining with (3b), the crystallization temperature is 4
The block bodies (2a) and (2b) are made by using low melting point solder with a low melting point of 123°C or 143°C, which is sufficiently lower than 200°C from 20°C to 520°C.
7Al- is obtained, so there is no deterioration of the magnetic properties of this amorphous magnetic thin film core, and a magnetic head with good characteristics, reliability, and high yield. It is something that can be obtained.

[Brief explanation of drawings]

FIG. 1 is an enlarged front view of an example of a magnetic head according to the present invention;
FIG. 2 is an enlarged plan view thereof, FIG. 3 is a similar enlarged side view, and FIG. 4 is an enlarged exploded perspective view thereof. (1) is a magnetic head according to the present invention, (2a) and (2b)
) is the block half-open, (3a) and (3b) are the amorphous magnetic thin film core half-open, (41 and (8) are the insulating layers, (7) is the low melting point solder, and OI is the magnetic gap. 85 Figure 4 Inside Sony Corporation, 6-7-35, Kitashinyo, Tokyo Parts Ward

Claims (1)

[Claims] A magnetic head in which a reinforcing body is disposed to sandwich an amorphous magnetic thin film core, and the reinforcing body and the thin film core are fused and bonded together by low-spot solder.