JPH01158606A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To improve permeability in a vertical direction to an amorphous film by inducing uniaxial anisotropy in a direction equivalent to the gap depth of a magnetic head for which an amorphous soft magnetic film having a specific function is used. CONSTITUTION:The amorphous soft magnetic film whose saturation magnetic flux density is large corresponding to a metallic magnetic recording medium purposing a high recording density is used for the magnetic head. An amorphous film 2 is formed on a magnetic substrate 1 and after that, a heat treatment in a fixed magnetic field is executed beforehand in the direction equivalent to the gap depth direction at the time of completing the magnetic head A track processing to a part 4 to which a head core is glass-joined is executed, after that, a nonmagnetic material 5 is formed on the amorphous film 2 of a core 7 and the cores 6 and 7 are joined. The above-mentioned processing is also executed in the gap depth direction at the time of completing the magnetic head and when the uniaxial anisotropy is induced in said direction, the permeability improves. Next, when it is cut at a prescribed place, one good magnetic head without the degradation of the permeability can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head for high-density magnetic recording using an amorphous soft magnetic material.

Conventional technology A magnetic head using an amorphous soft magnetic film with a large saturation magnetic flux density B, which is compatible with metal magnetic recording media aiming at high recording density, is made by forming an amorphous film on a magnetic substrate. The basic structure of the head is to create a pair of cores by joining a pair of cores through a non-magnetic material after performing track processing on the coil winding window and the part where the head core is joined to the glass. There is.

Here, amorphous films created by various vapor deposition methods require heat treatment to increase their magnetic permeability, but this method requires the Curie temperature Tc and crystallization temperature Tx of the amorphous magnetic material to be When the relationship Tc < Tx, Tc≦'rm(TX
By performing the heat treatment at the temperature Tm, the magnetic permeability was improved.

Problems to be Solved by the Invention However, due to the demand for higher density recording, in the case of an amorphous material with a larger S value that corresponds to a metal magnetic medium with a higher coercive force, as the Bs value increases, Normal T
For most amorphous films with c-values that are too small, e.g.
Therefore, the above-mentioned heat treatment at a temperature higher than To is impossible because it involves crystallization of the amorphous film.

In this case, the temperature Tm below Tx of the amorphous film (Tm<T
x), it was common to improve the magnetic permeability of the film by heat treatment in a rotating magnetic field.

However, in the structure of the magnetic herad chip, in areas with minute shapes such as near the magnetic herad gap, the externally applied magnetic field does not work effectively due to the demagnetizing field effect, and a sufficient rotating magnetic field is applied to this area. To let
Due to the disadvantage of requiring an extremely large external magnetic field, heat treatment in an external magnetic field of normal magnetic field magnitude (up to ~1 KOθ) will not improve the permeability of the amorphous material in the head, especially in this region. In fact, such high Bs
Many of the magnetic hemlock cores fabricated using an amorphous TX film while undergoing heat treatment in a rotating magnetic field had insufficient head output.

The present invention has a high Bs value as described above, and TO') T
When producing a magnetic head having an amorphous substance having an X relationship,
We improved the drawbacks of the method of heat treatment in a rotating magnetic field to improve the magnetic permeability of the amorphous film, and we
The present invention provides a magnetic head capable of obtaining sufficient characteristics by an external magnetic field (up to 1), and a method for manufacturing the same.

Means to Solve the Problem In order to achieve this objective, uniaxial anisotropy is induced in the amorphous film plane corresponding to the gap depth direction of the magnetic head by heat treatment in a fixed magnetic field.

By inducing uniaxial anisotropy in the direction corresponding to the gap depth of the magnetic head in the plane of the working amorphous film, it is possible to improve the magnetic permeability at least in the direction perpendicular to the amorphous film. It is possible to prevent a decrease in magnetic permeability near the herad gap in the method using heat treatment in a rotating magnetic field, and as a result, the efficiency of the entire magnetic head core including the magnetic substrate can be improved.

Embodiment A magnetic head according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1a is a diagram showing a method of manufacturing a magnetic head according to an embodiment of the present invention, and is a perspective view of the same magnetic head.

For example, as shown in FIG. 1, a magnetic head using an amorphous soft magnetic film with a large saturation magnetic flux density BS, which is compatible with metal magnetic recording media aiming at high recording density, has an amorphous magnetic film on a magnetic substrate 1. After forming the film 2 and performing track processing on the coil winding window 3 and the portion 4 where the head core is glass-bonded, a non-magnetic material 6 is formed on the amorphous film 2 of the core 7. Then, join the core 6 and the end, cut it at the predetermined place, and
magnetic heads.

FIG. 1 is a perspective view thereof.

In the present invention, after forming the amorphous film 2 on the magnetic substrate 1,
Heat treatment is performed in a fixed magnetic field in advance in a direction corresponding to the gap depth direction when the magnetic head is completed, and subsequent head processing heat treatment (core bonding, glass molding, head gap adhesion, etc.) is performed in the same direction as above. It is.

Curve a in FIG. 2 shows uniaxial anisotropy in the gap depth direction of a magnetic head using a C066TK8Hf4 amorphous film (TQ) (: 525°C) as a digital audio tape recorder according to the present invention. (fixed magnetic field, Heχ
~fKOθ). The curved line in FIG. 2 is a characteristic diagram of a magnetic head of the same type and material prepared using a conventional method of heat treatment in a rotating magnetic field.

As can be seen from Figure 2, the conventional magnetic head has insufficient head characteristics due to what appears to be deterioration of magnetic permeability near the gap, but the magnetic head of the present invention has better performance in both low and high frequencies. Good head output was obtained.

Effects of the Invention As described above, according to the present invention, even in a magnetic head including a soft magnetic amorphous film with a high Bs and a relationship of Tc>Tz,
Sufficient head output can be obtained with less deterioration of magnetic permeability near the head gap.

[Brief explanation of the drawing]

FIG. 1a is a diagram showing a method of manufacturing a magnetic head according to an embodiment of the present invention, the same figure is a perspective view of the same magnetic head, and FIG. 2 is a frequency characteristic diagram of the magnetic head of the present invention and a conventional magnetic head. It is. 1...Magnetic substrate, 2...Amorphous film, 3
... Window for coil winding, 6 ... Non-magnetic material. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1 - Magnetic +■

Claims (3)

[Claims] (1) A magnetic head core in which the surfaces of two substrates each having an amorphous soft magnetic film deposited on the magnetic substrate are joined via a non-magnetic layer serving as a magnetic gap, wherein the magnetic head core has a magnetic field within the amorphous surface. A magnetic head characterized in that uniaxial anisotropy is induced in the gap depth direction with respect to the front surface of the gap. (2) The magnetic head according to claim 1, wherein the amorphous film is made of a material whose Curie temperature is higher than the crystallization temperature. (3) After depositing the amorphous film on the magnetic substrate, heat treatment is performed in advance in a fixed magnetic field in a direction corresponding to the gap depth direction when the magnetic head is completed, and the subsequent head processing heat treatment is also performed in a magnetic field in the same direction. A method for manufacturing a magnetic head, characterized in that the magnetic head is manufactured by medium heat treatment.