JPS59162609A - Magnetic head - Google Patents

Abstract

PURPOSE:To suppress the partial existence of a magnetic flux due to an eddy current to improve the recording characteristic of a high frequency signal by providing a metallic magnetic material and an oxide magnetic material, which is laminated alternately with the metallic magnetic material so that a plane which is vertical to the running face of a recording medium and includes the running direction is a junction face, in a magnetic head. CONSTITUTION:A metallic magnetic material 8 consists of ''Sendust'' or the like and an oxide magnetic material 9 consists of ferrite or the like. The magnetic material 8 and the magnetic material 9 are laminated alternately to constitute a core 1 with three layers. In case of transmission and reception of information, an eddy current tries to occur in the magnetic material 8 orthogonally to the plane formed by a magnetic flux 7, but the eddy current is suppressed because a high resistance part of the magnetic material 9 exists in the plane formed by the magnetic flux 7, and a magnetic flux distribution is turned in the core 1 approximately uniformly to use effectively the magnetic path of the core 1, and therefore, the magnetic flux quantity per supply current is increased about 30% in comparison with a conventional head.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head that exchanges information with a recording medium using magnetic flux.

A perspective view of a conventional U-shaped magnetic head, for example, is shown in FIG.
Shown in l. In the figure, il+ is a core made of a metal-based magnetic material whose main component is a metal such as Sendust or a crystalline metal, and (2) is a winding wire wound around core m through a coil hole (31). (4) is the gap provided to connect the surface facing the tape (51) and the coil hole (3), (6) is the hole for attaching the magnetic head. It shows the magnetic flux lines of the magnetic field generated when a current is passed through wire (2).

When a signal current is applied to the winding (2) with the above configuration,
A magnetic flux as shown by magnetic flux lines (7) is formed in the core 11) by the signal current. FIG. 1tb) shows the results of magnetic field analysis using the well-known finite element method. The tape (51) is magnetized by this magnetic speed, and information is written to the tape (5).On the other hand, when reading information from the tape (5), magnetic flux is applied to the core (1) depending on the amount of magnetization of the tape (5). Therefore, an induced current flows in the winding (2).

Information can be obtained from this current value.

Since the conventional magnetic head is configured as described above,
When exchanging information with the tape (5), the core (11) is under the control of alternating current magnetic flux. Therefore, an eddy current is induced perpendicular to the plane created by the magnetic flux (7), and As shown in Figure 2, the magnetic flux distribution becomes unevenly distributed.As a result, the core (11
Therefore, the magnetic flux (7) is not formed effectively, and the amount of magnetization for a single current is reduced. In addition, the uneven distribution of magnetic flux due to this eddy current depends on the frequency, and the amount of magnetization greatly depends on the frequency, which impairs the basic specifications of the magnetic head, which aims for the amount of magnetization to be proportional to the energizing current. It had the disadvantage of becoming

This invention was made in order to eliminate the drawbacks of the conventional ones as described above.
By providing the metal-based magnetic material and the oxide magnetic material alternately laminated so that the surface perpendicular to the running surface of the recording medium and including the running direction is the bonding surface, uneven distribution of magnetic flux due to eddy current is suppressed. It is an object of the present invention to provide a magnetic head that can improve the recording characteristics of high-frequency signals.

An embodiment of the present invention will be described below.

In FIG. 2(a), (8) is a metal-based magnetic material whose main component is a metal or crystalline metal, such as sendust, and (91 is an oxide magnetic material, such as ferrite.) The magnetic material (9) is alternately laminated with the metallic magnetic material (8) so that the surface perpendicular to the running surface of the tape (5) and including the running direction is the bonding surface, and the core (1) is formed in three layers. It consists of

The magnetic flux created during the exchange of information causes a metallic magnetic material (8
), an eddy current is generated perpendicular to the plane created by the magnetic flux (7), but since there is a high resistance part of the oxide magnetic material +91 parallel to the plane created by the magnetic flux (7), the eddy current considerably suppressed. As a result, as shown in Figure 2 (bl),
The magnetic flux distribution in the core (1) turns almost uniformly compared to Fig. 1 (b), and the magnetic path of the core (1) is effectively utilized, so the amount of magnetic flux per energizing current is , which is about 30% more than the conventional magnetic head.

In the above embodiment, the present invention is applied to a U-shaped core, but the present invention is not limited to this, and can be applied to other cores such as curved cores. Further, although the core is made of a three-layer stack of a metal magnetic material and an oxide magnetic material, the present invention is not limited to this, and any number of layers of two or more will be effective. Further, even if the surface layer is made of an oxide magnetic material instead of a metallic magnetic material as in the above embodiment, the same effect can be obtained as long as both magnetic materials are alternately laminated. .

Furthermore, even if the recording medium is not a tape, the present invention can be applied to other magnetic recording mechanisms where deterioration in performance due to uneven distribution of magnetic flux caused by eddy currents is a problem.

As described above, according to the present invention, the magnetic head is made of a metal-based magnetic material, and the metal-based magnetic material is alternately formed with Ueda's metal magnetic material such that the bonding surface is a surface perpendicular to the running surface of the recording medium and including the running direction. By including an oxide magnetic material laminated on the magnetic layer, uneven distribution of magnetic flux due to eddy currents can be suppressed, and recording performance can be greatly improved.

[Brief explanation of the drawing]

Figure 1 (al) is a perspective view showing a conventional magnetic head, Figure 1 (1) is an analysis diagram using the finite element method showing the magnetic flux distribution in a conventional magnetic head, and Figure 2 (aljt) is a perspective view of a conventional magnetic head. FIG. 2 is a perspective view showing a magnetic head according to an embodiment of the present invention (bl is a magnetic flux distribution distributed by a magnetic head according to an embodiment of the present invention). The system magnetic material (9) is an oxide magnetic material. In addition, the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 2 ((1') (b)

Claims (1)

[Claims] A magnetic head comprising: a metal-based magnetic material; and an oxide magnetic material alternately laminated with the metal-based magnetic material such that a surface perpendicular to the running surface of a recording medium and including the running direction serves as a bonding surface.