JP2812572B2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used for audio equipment and the like, and more particularly to a magnetic head having a laminated core.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a magnetic head having a laminated core has symmetrically divided hold cases 1 and 2 for fixing various components at predetermined positions.
One. The hold case 1, 1 has sliding contact surfaces 1a, 1a curved so that one surface faces the magnetic tape so as to achieve a smooth sliding operation, and these sliding contact surfaces 1a, 1a are provided.
Laminated cores 2, 2 in which a plurality of thin magnetic materials are laminated are disposed symmetrically at opposite ends.

As shown in FIG. 2, the laminated core 2 is formed by laminating a plurality of substantially U-shaped core flakes 3 made of a magnetic material. The surface is a magnetic gap 6.
Further, as shown in FIG. 1, a coil 4 is wound around these laminated cores 2, and a gap plate 5 is interposed in a magnetic gap 6 to form a magnetic head 7.

In recent years, the recording signal density, quality, and performance of the magnetic head 7 have been increased, and the magnetic material of the laminated core 2 of the magnetic head 7 described above includes: What is desired is a material having a high saturation magnetic flux density, a high magnetic permeability, a low coercive force, a high abrasion resistance, a high hardness and a thin shape.

Conventionally, crystalline alloys such as Sendust, Permalloy, and silicon steel have been used as magnetic materials meeting such requirements, and recently, Fe-based and Co-based amorphous alloys have also been used. ing.

[0006]

However, although Sendust is excellent in soft magnetic properties, it has a low saturation magnetic flux density of about 11 KG, and permalloy also has a high saturation magnetic flux density in an alloy composition excellent in soft magnetic properties. It has a drawback as low as about 8 KG, and silicon steel has a drawback in that although the saturation magnetic flux density is high, the soft magnetic properties are poor.

On the other hand, among the amorphous alloys, the Co-base alloy has excellent soft magnetic properties, but the saturation magnetic flux density is insufficient at about 10 KG, and the Fe-base alloy has a high saturation magnetic flux density and is 15 KG or more. Is obtained, but the soft magnetic properties are insufficient. Further, the thermal stability of the amorphous alloy is not sufficient, and there are still unsolved aspects. As described above, it is difficult to combine high saturation magnetic flux density with excellent soft magnetic characteristics.

Therefore, the present inventors have previously disclosed a high saturation magnetic flux density Fe-based soft magnetic alloy which has solved the above-mentioned problems of the conventional alloy and the amorphous alloy in Japanese Patent Application No. 2-108308 in Japanese Patent Application Publication No. A patent application was filed on April 24.

Another one of the alloys according to this patent application is a high saturation magnetic flux density alloy having a composition represented by the following formula. (Fe ₁₋ a Co a) b Bx Ty T′z where T is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo and W; And Zr,
Hf, or both, and T 'is Cu, Ag, Au, N
one or more elements selected from the group consisting of i, Pd, and Pt; a ≦ 0.05, b ≦ 92 at%, x = 0.
5-16 atomic%, y = 4-10 atomic%, z = 0.2-
It is 4.5 atomic%.

Another one of the alloys according to the patent application is a high saturation magnetic flux density alloy characterized by having a composition represented by the following formula. FebBxTyT'z where T is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, W, and Zr,
Hf, or both, and T 'is Cu, Ag, Au, N
one or more elements selected from the group consisting of i, Pd, and Pt; b ≦ 92 at%, x = 0.5 to 16 at%, y = 4 to 10 at%, z = 0 0.2 to 4.5 atomic%.

Further, the present inventors have previously filed a patent application for an alloy having the following composition as an advanced alloy of the above alloy.

One of the alloys according to this patent application is a high saturation magnetic flux density alloy having a composition represented by the following formula. (Fe ₁₋ a Qa) b B x T y where Q includes one or both of Co and Ni;
T is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, W, and Zr, Hf
A ≦ 0.05, b ≦ 9
2 at%, x = 0.5 to 16 at%, y = 4 to 10 at%.

Another one of the alloys according to the patent application is a high saturation magnetic flux density alloy having a composition represented by the following formula. FebBxTy where T is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, W, and Zr,
Hf or both, b ≦ 92 at%, x
= 0.5 to 16 at%, y = 4 to 10 at%.

As described above, the present inventors have developed various Fe-based soft magnetic alloys having the above-mentioned respective compositions. Since it has been found that a good magnetic head can be obtained by using the core, the present invention has been reached.

The present invention has been made in view of the above circumstances, and applies a soft magnetic alloy having both high saturation magnetic flux density and high magnetic permeability and having high mechanical strength and high thermal stability to a laminated core. It is an object of the present invention to provide a magnetic head.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention applies an alloy having the following composition to a laminated core of a magnetic head. This is an application of a Fe-based soft magnetic alloy having more excellent soft magnetic properties and a high saturation magnetic flux density.

[0017]

[0018]

The high saturation magnetic flux density Fe-based soft magnetic alloy used in the magnetic head according to claim 1, wherein the state, and are made of a composition represented by the following formula, yet precipitate fine crystal grains of
It was made . (Fe ₁₋ a Q a) b Bx Ty where Q includes one or both of Co and Ni, and T
Is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, and W, and contains one or both of Zr and Hf; .05, b ≦ 9
3 at%, x = 0.5 to 8 at%, y = 4 to 9 at%.

The high saturation magnetic flux density Fe-based soft magnetic alloy used in the magnetic head according to claim 2, wherein the state, and are made of a composition represented by the following formula, yet to precipitate fine crystal grains
Things . Fe B Bx Ty where T is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, W, and either Zr or Hf, or B ≦ 93 atomic%, x = 0.5-8 atomic%, y = 4-9
Atomic%. A high saturation magnetic flux density used for the magnetic head according to claim 3.
The fine crystal grains precipitated on the Fe-based soft magnetic alloy
Amorphous alloy or crystalline alloy containing amorphous phase
Gold melt was quenched and precipitated by heat treatment
Things.

Hereinafter, the present invention will be described in more detail. The magnetic head of the present invention has a schematic configuration similar to the magnetic head 7 shown in FIGS.

That is, a laminated core in which a coil 4 is wound around a hold case 1 having a sliding contact surface 1a, 1a curved so that one surface is opposed to the medium so as to achieve a smooth sliding contact operation. 2 is provided. The laminated core 2 is formed by laminating a plurality of core thin pieces 3 formed by punching out a ribbon-shaped alloy.

The high saturation magnetic flux density Fe-based soft magnetic alloy applied to the core flake 3 of the magnetic head 7 of the present invention rapidly cools an amorphous alloy having the above composition or a crystalline alloy containing an amorphous phase from a molten metal. And a heat treatment step of heating the product obtained in these steps to precipitate fine crystal grains.

In the high saturation magnetic flux density Fe-based soft magnetic alloy applied to the magnetic head of the present invention, in order to easily obtain an amorphous state, it is necessary to include either Zr or Hf having a high amorphous forming ability. There is. In addition, Zr and Hf are partially
It can be replaced with Ti, V, Nb, Ta, Mo, and W among the elements of Group 6A. Here, Cr was not included because
Is inferior to other elements in amorphous forming ability.

It is considered that B has the effect of increasing the ability of the alloy applied to the magnetic head of the present invention to form an amorphous phase, and the effect of suppressing the formation of a compound phase that adversely affects magnetic properties in the heat treatment step. Therefore, the addition of B is essential. Like B, Al, Si, C, P and the like are generally used as amorphous forming elements, and the addition of these elements can be regarded as the same as the present invention.

Cu, Ni and the like represented by T 'lower the temperature at which the alloy crystallizes, and contribute to the refinement of the structure after the heat treatment. When this T 'component is added, the compounding ratio z is desirably 4.5 atomic% or less, particularly preferably 0.2 to 4.5 atomic%. If z is less than 0.2, the magnetic permeability tends to decrease, but this tendency can be counteracted by increasing the cooling rate after the heat treatment. This phenomenon can be confirmed by the graph shown in FIG. This graph shows the result of measuring a magnetic permeability after heating a sample of a soft magnetic alloy having a composition of Fe ₈₈ Cu ₁ B ₃ Zr ₈ at 650 ° C. for 1 hour, cooling at various cooling rates, and thereafter. is there. From this graph, it can be seen that increasing the cooling rate after the heat treatment improves the magnetic permeability.

The reasons for limiting the alloy elements contained in the high saturation magnetic flux density Fe-based soft magnetic alloy applied to the laminated core of the magnetic head according to the present invention have been described above. It is also possible to add Cr, Ru and other platinum group elements to the alloy, and if necessary, Y, rare earth elements, Zn, Cd, Ga, In, Ge, Sn, P
The magnetostriction can also be adjusted by adding elements such as b, As, Sb, Bi, Se, Te, Li, Be, Mg, Ca, Sr, and Ba. In addition, unavoidable impurities such as H, N, O, and S have the same composition as that of the high saturation magnetic flux density Fe-based soft magnetic alloy applied to the present invention even if they are contained to such an extent that desired characteristics are not deteriorated. Of course, it can be considered.

An example of a method for manufacturing the laminated core 2 used in the magnetic head of the present invention will be described below, but the method is not limited to this.

One of the alloys used in the present invention, Fe,
_A core thin piece 3 is prepared by subjecting a thin piece of high saturation magnetic flux density Fe-based soft magnetic alloy having a composition represented by ₈₇ Zr ₃ Nb ₃ B ₆ Cu ₁ having a thickness of 30 mm to a pressing step and a barrel grinding step.

Next, it is refined (600 ° C.) in an annealing step while keeping the flakes alone. In the core alignment step, the refined core flakes 3 are inserted into a jig, aligned in the same direction and closely adhered, and at this time, a partition plate is inserted for every predetermined number of core flakes 3 forming the laminated core 2. I do. Next, in a state where the core thin piece 3 and the partition plate are closely adhered and laminated, they are welded in a laminating direction by a laser welding process. Then, since the partition plate is not welded or has a weak welding force, a predetermined number of sheets are laminated and welded by a simple separating operation in the next core separating step. This is impregnated with a resin liquid in a resin impregnation step to form a laminated core 2 having an insulating resin film formed between the core flakes 3 as shown in FIG.

[0031]

EXAMPLE A magnetic head 7 similar to the conventional magnetic head 7 shown in FIG. 1 was manufactured using the laminated core 2 prepared as described above.

The laminated cores 2, around which the coil 4 is wound, are symmetrically arranged on the hold cases 1, 1 such that the butting surfaces are magnetic gaps 6. Further, the gap plate 5 was interposed in the magnetic gap 6.

The magnetic properties of the obtained magnetic head material were measured. The magnetic permeability (1 KHz) was 33,800, the coercive force was 0.05 Oe, and the saturation magnetic flux density was 16 KG. Since the magnetic head exhibited excellent magnetic characteristics, it was confirmed that the magnetic conversion characteristics of the magnetic head were excellent.

Further, the magnetic head core is an extremely hard one whose measured value of Vickers hardness is 1300 DPN.
As shown in FIG. 3, a magnetic head having excellent wear resistance was obtained.

[0035]

As described above, the present invention provides a high saturation magnetic flux density Fe-based soft magnetic material having both high saturation magnetic flux density and high magnetic permeability, low coercive force, excellent thermal stability, and high mechanical strength. An extremely high performance magnetic head can be obtained by using an alloy for the laminated core.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a magnetic head.

FIG. 2 is a view showing a laminated core, wherein (a) is a perspective view,
(b) Side view when laminated core is combined

FIG. 3 is a graph showing wear resistance.

FIG. 4 is a graph showing a relationship between a cooling rate and magnetic permeability.

[Explanation of symbols]

 2 Laminated core 3 Core flake 7 Magnetic head

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihisa Inoue 11-806 Kawauchi House No. Kawauchi, Aoba-ku, Sendai City, Miyagi Prefecture (56) References JP-A-1-242755 (JP, A) JP-A-56- 72153 (JP, A) JP-A-56-71816 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01F 1/153

Claims (3)

(57) [Claims] 1. A has a high saturation magnetic flux density Fe-based laminated core the core flakes are formed from a ribbon of soft magnetic alloy formed by laminating having a composition represented by the following formula, wherein the highly saturated magnetization
The flux density Fe-based soft magnetic alloy has fine crystal grains precipitated.
A magnetic head, characterized in that: (Fe ₁₋ a Q a) b Bx Ty where Q includes one or both of Co and Ni, and T
Is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, and W, and contains one or both of Zr and Hf; .05, b ≦ 9
3 at%, x = 0.5 to 8 at%, y = 4 to 9 at%. 2. A has a high saturation magnetic flux density Fe-based laminated core the core flakes are formed from a ribbon of soft magnetic alloy formed by laminating having a composition represented by the following formula, wherein the highly saturated magnetization
The flux density Fe-based soft magnetic alloy has fine crystal grains precipitated.
A magnetic head, characterized in that: Fe B Bx Ty where T is one or more elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mo, W, and either Zr or Hf, or Including both, b ≦ 93 at%, x = 0.5 to 8 at%, y = 4 to 9 at%. 3. The magnetic head according to claim 1, wherein
The fine magnetic flux deposited on the high saturation magnetic flux density Fe-based soft magnetic alloy.
The fine crystal grains are an amorphous alloy represented by the above composition or
The melt of the crystalline alloy containing the amorphous phase is quenched and heat treated.
Characterized by being precipitated by being removed
head.