JPS5938648B2 - magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording and/or reproducing magnetic head for high frequency magnetic recording (hereinafter simply referred to as a magnetic head).

In recent years, there has been remarkable progress in increasing the frequency of magnetic recording, and recently, recording and reproduction of 10 MH2 or higher has become possible.

It is well known that such high frequencies have been made possible by advances in the materials that make up the magnetic core of magnetic heads. It can be said that the transition from magnetic cores to magnetic cores using ferrite occurred with the establishment of ferrite manufacturing technology. However, the demand for higher frequency magnetic recording continues unabated, and the emergence of a magnetic head capable of recording and reproducing from several + MH2 to 100 MH2 is awaited. Ferrox Burana single crystal is considered to be a promising magnetic core material for magnetic heads that can withstand such ultra-high frequency magnetic recording, but it is extremely difficult to create a single crystal, and its practical application has been delayed. It is difficult to predict this early.

As described above, since there is no suitable magnetic core material that can withstand ultra-high frequency recording, metal high permeability materials have recently begun to attract attention again.

That is, by laminating thin films of metal high magnetic permeability material in multiple layers via electrical insulating layers, eddy current loss at high frequencies is suppressed, reduction in magnetic permeability in high frequency bands is reduced, and the film is made thinner. By essentially confining the direction of internal magnetization within two dimensions of the film surface, it is intended to provide high frequency characteristics similar to those of Ferrox Burana. Specifically, a magnetic core having a working gap made of such a laminated metal material with high magnetic permeability is constructed, for example, as schematically shown in FIG. 1.
That is, using a laminated high magnetic permeability material in which an electrically insulating layer 2 is inserted between a thin layer 1 of metal high magnetic permeability material, the working gap 3 is
In forming the magnetic core having the winding window 5 for the coil 4, the working gap 3 is provided so as to cut each layer of the laminated high magnetic permeability material, and each thin layer of the metal high magnetic permeability material is Each must be constructed so as to form a substantially independent magnetic circuit. When recording signals on a recording medium using a magnetic head having such a magnetic core, as schematically shown in FIG. It will be recorded as if the non-recording line 7 is present. Note that the arrow in FIG. 2 indicates the running direction of the recording medium. Therefore, when the purpose is to record and reproduce frequencies of +MHz, the thickness of the metal high magnetic permeability material of the laminated high magnetic permeability material needs to be extremely thin, several micrometers or less, and on the other hand, the thickness of the electrically insulating layer In order to ensure sufficient insulation, the thickness cannot be made negligibly thinner than the thickness of the metal high magnetic permeability material, and the presence of the non-recording stripes 7 cannot be ignored. When reproducing signals from a recording medium recorded in this manner using a magnetic head such as that described above, the relative position of the recording medium in the vertical direction relative to the track with the magnetic head must be strictly controlled. In other words, a slight deviation of several μm or less causes a large fluctuation in the reproduced output signal. The object of the present invention is to provide a magnetic head that eliminates the above-mentioned drawbacks and uses a laminated metal high permeability material as the main constituent material of the magnetic core.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 3 schematically shows an example of the present invention,
A main magnetic core 10 around which a coil 4 is wound, and an operating gap 3
It consists of a head tip chip 8 that makes up the head. The main magnetic core 10 is made of a laminated metal high permeability material consisting of a metal high permeability material 1 and an electrically insulating layer 2.
A head chip 8 made of a high magnetic permeability material without a laminated structure is closely attached to the tip of the head. The magnetic head constructed as described above has a main magnetic core made of a laminated metal high permeability material with excellent high frequency characteristics.
It has excellent high frequency characteristics, and the operating gap is made of a high magnetic permeability material that does not have a laminated structure.
The influence of the structure of the laminated metal high magnetic permeability material that constitutes the main magnetic core on recording on the recording medium is alleviated, and the recording and non-recording striations that appear when the magnetic core is simply formed of the laminated metal high permeability material are reduced. The striped recording problem is solved. Therefore, it can be seen that the magnetic head according to the present invention is an extremely useful magnetic head for ultra-high frequency magnetic recording. In addition,
In the above embodiment, the working gap forming chip made of a high magnetic permeability material without a laminated structure was constructed so as to cover the entire upper surface of the main magnetic core, but as shown in Fig. 4, only the very vicinity of the working gap was laminated. It is clear that the same effect can be expected even if it is made of a high magnetic permeability material without a structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional magnetic head whose magnetic core is made of a laminated metal material with high magnetic permeability, and FIG. 2 is a top view of the recording state when a signal is recorded on a recording medium by the magnetic head. , 3 and 4 are schematic diagrams of a magnetic head according to the present invention.

Claims (1)

[Claims] 1 A main magnetic core formed by laminating a metal high magnetic permeability thin film with a thickness of several μm or less through an electrically insulating layer whose thickness is not negligible with respect to the thickness of the metal high magnetic permeability thin film, and a single magnetic core. 1. A magnetic head comprising a layer and an operating gap made of a high magnetic permeability material.