JPH02302908A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a necessary frequency characteristic by changing the film forming conditions of each metallic magnetic film for each film, changing a magnetization facilitating axis direction for each film and making the films into a magnetization anisotropy and magnetization isotropy metallic magnetic films. CONSTITUTION:Metallic magnetic films 1... in four layers to form a laminate layer 3 are made into the magnetization anisotropy films, and simultaneously, the directions of magnetization facilitating axes A1, A2, B1, B2, C1, C2, D1 and D2 are changed for respective films and respective cores 5 and 6. In such a way, when the directions A1, A2, B1, B2, C1, C2, D1 and D2 of the magnetization facilitating axes in respective magnetization anisotropy metallic magnetic films 1... in four layers of the laminate layer 3 are changed for respective films and respective cores 5 and 6, the frequency characteristics of a head output are made different for respective metallic magnetic films 1... of respective cores 5 and 6. Thus, by properly changing the combinations, the arbitrary frequency characteristic can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head, and more specifically, a laminate having a structure in which a laminate layer of metal magnetic films having a high saturation magnetic flux density is sandwiched between non-magnetic substrates. The present invention relates to a high-density recording magnetic head.

[Conventional technology]

There is a multilayer type magnetic head for high-density recording used in magnetic recording and reproducing devices such as VTR devices and FDD devices.

This laminated high-density recording magnetic head is shown in FIGS. 7 and 8.
As shown in the figure, metal magnetic films such as sendust and permalloy with high saturation magnetic flux density (1) (1: l-・- and Si0
A laminate layer (3) consisting of alternately laminated insulating thin films (2) (2), (2), etc., such as Al209 and Al209 is sandwiched between non-magnetic substrates (4), such as ceramic (4), from both sides. It is composed of a core chip (7) in which a pair of cores (5) and (6) are joined and integrated. The cores (5) (6> are made of low melting point glass (
9), they are joined and integrated. This core chip (
7), at the top end surface (10) where the magnetic recording medium slides,
A magnetic gap g is formed by interposing a non-magnetic thin film such as Si02 between the bonding surfaces (5a) and (6a) of the cores (5) and (6). In this magnetic gap g, the metal magnetic films (1) (1), - and the insulating thin film (2)
(2) The thickness of the laminate layer (3) consisting of - becomes the track width (T). Insulating thin film (2) (2) between metal magnetic films (1) (1) composing the above laminate layer (3)
) - is electrically insulated to suppress the generation of eddy currents when magnetic flux passes, thereby preventing deterioration of high frequency characteristics. Note that the core chip (7) includes cores (5) (6).
) The coil (
15).

[Problem to be solved by the invention]

By the way, in the above-mentioned magnetic head, laminate N (
The metal magnetic film (1) - in 3) is formed by sputtering under the same film forming conditions for each film, but at that time, it is not possible to set the film quality that determines the frequency characteristics of the head, and it is not possible to set the desired film quality. It was difficult to obtain frequency characteristics.

[Means for Solving the Problems] The present invention combines a pair of cores made by sandwiching non-magnetic substrates between laminate layers in which metal magnetic films and insulating films having high saturation magnetic flux density are alternately laminated, and a pair of cores are integrally bonded. In a magnetic head in which a magnetic gear is formed by forming a magnetic gear, the film forming conditions for each of the above-mentioned metal magnetic films are changed for each film, so that the axis of easy magnetization can be changed for each film, thereby improving magnetization anisotropy and magnetization isotropy. As a metal magnetic film,
It is characterized by controlling the frequency characteristics of the head output.

[Effect]

According to the above technical means, since the direction of the easy axis of magnetization of the anisotropic metal magnetic film and the frequency characteristic of the head output are different from each other in the isotropic metal magnetic film, any combination thereof can be used. You can set the frequency characteristics of the head output.

〔Example〕

An embodiment of the magnetic head according to the present invention will be described below with reference to FIGS. 1 to 6. The same reference numerals as in FIG. 7 indicate the same parts, and the explanation thereof will be omitted. The feature of the present invention is that, as shown in FIGS. 2 to 4, the four metal magnetic films (1) forming the laminate layer (3) are made into magnetization anisotropic films, and each film is and the axis of easy magnetization (Ai) (A2) (Bt) (B2) for each core (5) (6).
) (Ct) (C2) (Di) (D!
) has changed direction. That is, as shown in FIG. 6, the basic idea of the present invention is that the head normalized output curve (Pl) versus frequency when the laminate layer (3) is formed of a metal magnetic film with magnetization anisotropy in one direction, and It is known that the head normalized output curve (B2) with respect to frequency when the laminate layer (3) is formed of an isotropic metal magnetic film has unique characteristics. By changing the direction, the frequency characteristics of the head output curve (B3) can be changed. Therefore, as mentioned above, each of the four magnetization anisotropic metal magnetic films (1
)・-, the direction of the axis of easy magnetization (A1) (A2
)(Bl)(B2)(Ct)(C2)(Dt)
If (D2) is changed for each film and each core (5), (6), the frequency characteristics of the head output will be different for each metal magnetic film (1), - of each core (5), (6). Therefore, by appropriately changing the combination thereof, it is possible to obtain any frequency characteristic, and it is possible to set the frequency characteristic of the head output to a desired one.

In addition to the above-mentioned embodiments, the above combinations include, for example, the easy axis direction of magnetization (AI) (A2) (Dt) (
The anisotropic film in D2) is made an isotropic film, and the anisotropic film in the easy axis direction of magnetization (C1) (C2) is made into an isotropic film in the easy axis direction of magnetization (B
l) (B2), and other combinations may also be given arbitrarily.

Here, when changing the direction of the magnetic easy axis, when depositing the metal magnetic film (1) by sputtering, change the direction of the ion beam toward the cores (5) and (6).
It is sufficient to change the direction in which the crystal grows, and in the case of making an isotropic film, the direction of the ion beam is changed more markedly.

〔Effect of the invention〕

According to the present invention, in a multilayer magnetic head having a structure in which laminate layers in which metal magnetic films and insulating films are alternately laminated are sandwiched between nonmagnetic substrates, the easy axis direction of magnetization of the metal magnetic films is determined for each film. Since the frequency characteristics of the head output can be set by changing their combination, the desired result can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetic head according to the present invention, and FIGS. 2 to 5 show the directions of the easy magnetization axes of each film and each core in the metal magnetic film of the magnetic head of FIG. 1. FIG. 6 is a perspective view of the magnetic head shown in FIG.
The figures are a perspective view and a top view of essential parts of a specific example of a conventional magnetic head. (1) - Metal magnetic film, (2) - Insulating thin film, (3
) - laminate layer, (4) - non-magnetic substrate, (5)
(6),---core, (g) -magnetic gap,
(A1)(A2)(Bl)(B2)(Ct)(
C2) (DI) (D2) - Easy magnetization axis direction.

Claims (1)

[Claims] (1) A magnetic head in which a pair of cores made by sandwiching laminate layers of alternately laminated metal magnetic films and insulating films with high saturation magnetic flux density between non-magnetic substrates are bonded together to form a magnetic gap. In this step, the film forming conditions for each of the above metal magnetic films are changed for each film so that the easy axis direction of magnetization can be changed for each film to obtain a metal magnetic film with magnetization anisotropy and magnetization isotropy, and the frequency of the head output is changed. A magnetic head characterized in that characteristics can be set.