JPS60236106A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To make use of the high hardness and high corrosion resistance of an Au-Sn alloy and to obtain a magnetic head having excellent durability by using the Au-Sn alloy for joining of a core consisting of a magnetic metallic material and reinforcing plates. CONSTITUTION:The core formed by bonding core halves 1, 1' consisting of a highly magnetically permeable material such as ''Sendust(R)'' via a gap 2 is sandwiched by the reinforcing plates 5, 5 which consist of a non-conductive rigid material such as Mn-Zn ferrite and is formed with thin alloy films 3, 3 consisting of 79.6% Au and 20.4% Sn on the joint surfaces thereof with the core by dry plating of the Au-Sn alloy by a sputtering method or vapor deposition method or wet plating. The assembly is welded for about 10min at 350 deg.C furnace temp. The Au-Sn alloy has high hardness and excellent corrosion resistance, lower service temp. than silver solder and good workability. The head which has excellent heat resistance and durability and is suitable for high-density recording and reproducing is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a magnetic head made of a highly permeable magnetic material such as cess dust or amorphous material, and a method for manufacturing the same.

(Prior art) In recent years, high residual magnetic flux densities such as metal tapes and high density 111 tapes with high coercive force have been developed, which have a higher residual magnetic flux density than conventional soft fluorite type He/I do. There is a demand for fT1 magnetic heads that use metal magnetic materials such as I/L oxide abrasives and ammo/l oxide abrasives, which have a high S flux. %, there are high expectations for its realization in video magnetic heads. However, metallic magnetic materials have low resistivityζ
Therefore, when used in a high-frequency field, eddy currents occur and sufficient physical properties cannot be obtained. Therefore, it is necessary to make the thickness of the held core a thin film of several tens of microns.

However, in such a thin film, the mechanical strength IW is weak;
In order to construct the head 1r, it was necessary to attach some kind of reinforcing plate to at least one side.

Conventionally, this reinforcing plate was polished, Q-faced, and then bonded with an organic adhesive.In such a configuration, the thickness of the organic adhesive was 1 to 5 μm during the process. This is undesirable because the VC11 wear particles are generated when the tape is running, which hinders tape feeding.Another drawback is that the reliability of the organic adhesive is extremely unstable.

When you pull it out, the adhesive layer is thick, so the magnetic powder sticks to it,
There was a problem in that the tape could be damaged or recording errors could occur due to excessive interference. Furthermore, when the tape is running, heat is generated due to abrasion between the tape and the magnetic head, deforming the adhesive layer and causing problems in recording and reproducing.

In some cases, Aq roller is used to join the core and reinforcing plate; 11
Although there are some examples of this method, it has the drawback of high operating temperature and poor emergency pressure workability. Furthermore, with solder, rupture is low and corrosion resistance is <11
It has the disadvantage of poor abrasion resistance.

[Objective] The present invention solves these drawbacks and problems, and the core and reinforcing plate f have high hardness and excellent corrosion resistance. -S?
It is fused with L alloy, and provides the world with a magnetic head that has improved wear resistance and magnetic recording reliability.

[Cost] The present invention is based on the metal magnetic material. Strong selection (1
) Is J'J1 or structure b11' the magnetic throat and ill AVI-R? + Alloy 1fI is dry-alloyed
t Which part of the 4-style method is it? I+ν12, complement the metal magnetic material! Press on the V plate 1. The configuration 17 relates to the manufacturing process of the magnetic hemlock 1' by heating and melting 7f in the warm part of the application part 5iJ.

〔Example〕

The following is an example of the present invention. B1.
Ill do it.

FIG. 1 shows a general view of the 17th-order magnetic head of the present invention. 1 and 1'tTt gold magnetic] material 11 is 1/guest core with 2 gears and a bonded filter.

31-1. A'tl-Rn alloy 1-? which is a bonding layer? ′
, 411 winding coil. 7. With 5 reinforcing plates. ,l
- Roller +Jtr -Zη ferrite.

As shown in the figure, there is no conventional 1-machine adhesive cutting in [&G I@]. In addition, 1 gold w4 magnetic 44-Hk
It is not limited to Sendust, but includes high magnetic permeability metal materials such as soft magnetic amorphous H and permalloy.

(F!L, if you consider wear resistance etc., center strike 5←
) Clear amorphous material is preferred. Further, the reinforcing plate 5 is not limited to the Mη-Znn sheet, but any rigid non-conductive material such as glass may be used.

Next, the manufacturing method of the present invention will be explained. Araka l:
The high magnetic permeability metal material Sendust is shown in Fig. tR1.
) As shown in 1 and 1', gap parts are formed and joined to Lp. , -pB alloy layer is formed by a dry metal plating method to form a 1- layer of several micrometers.Dry method, d-snow method, vapor deposition method, etc. may also be used, but sputtering method allows the components to be self-contained.
Control 6 hours. The resulting composition of Sufu ζ ivy is AI+
: Section 79.6, 87L: Section 20.4.

In addition, 11. of the So-Rn alloy layer. ? Al-12~3μ is
It is preferable to use one layer of one layer in the finished state. Furthermore, a wet method is also possible using the well-known Ij method. In addition, if the reinforcing plate is non-conductive, 1. It is necessary to apply a conductive treatment in advance, and it is a well-known solution.
s(-W, 1 conductive treatment. Inside, gold W4
Magnetism ((in the case of using an Au-FJn alloy layer as material), a wet method is also easily possible.

In addition, Ajt-S? An example of the 1 bV/meso 1 strip f1 on the 1 alloy is shown below.

K ktt, (ON 1.: 22 Q/IEJn
C12: 351//1 Citric acid: 1509/l KOH: PH4,51cIII Rectifier current density:
I A/drn2 Anode: Pt plate Bath temperature: 45°C After that, the reinforcing plate and the metal magnetic material were put together and placed in a heat treatment furnace to perform fusion. -Example 4 (furnace temperature 1-
i Perform fusion at 350°C for 111110 minutesfc'l
.

A suitable winding is applied to the obtained magnetic head to form a magnetic head protector.

In addition, after heating the AVI, -st+ alloy at 350°C, the hardness Fi'ViHυ200-250 and the hardness of the solder I■1
)80-150, the abrasion resistance is also higher than 6-. In addition, the All-Sn alloy has a low melting point, so when using an amorphous material for the core, the crystallization temperature [! It also has the effect of being able to work at temperatures lower than 1'.

〔effect〕

According to the present invention, the bonding between the core made of a metal magnetic material and the reinforcing plate K A11.-Sn
By using the alloy, a magnetic head with good wear resistance due to the high hardness and corrosion resistance of the At/, -Sη alloy can be obtained, and a magnetic head with good durability of 1 can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic throat according to the present invention. 1... Metal magnetic material core (e.g. Sendust) 1'...
Metal magnetic material core (e.g. sendust) 2...Outside gap 3...Joining layer Au-Sn alloy 4...Wound coil

Claims (2)

[Claims] (1) At least the side surface of the core made of a metallic magnetic material K Au -S? A magnetic head in which either a glass reinforcing plate or a d-knot ferrite reinforcing plate is disposed and constructed via a composite bonding layer. (2) A core or reinforcing plate made of a metallic magnetic material is formed using either a dry or wet process, and the metallic magnetic material is pressed onto the reinforcing plate and heated to a predetermined temperature. A method for manufacturing magnetic metals formed by heating and melting.