JPS6257114A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head having an excellent high-frequency characteristic and good wear resistance by adding and solutionizing SnO2 or TiO2 alone or in combination within 5wt% into single crystal Mn-Zn ferrite. CONSTITUTION:The single crystal Mn-Zn ferrite 3, 3 consists of the compsn. contg. 52mol% Fe2O3, 30mol% MnO and 18mol% ZnO. 2% within 5% SnO2 and 0.5% TiO2 are added and solutionized in combination to such ferrite. Thin films 4, 4 of magnetic metallic materials such as 'Sendust(R)' films are formed to 2mum thickness to the butt faces which are the parts to be generated with magnetic poles. An SiO2 film is interposed to 0.3mum thickness to the part of a gap 5. The ferrite noise is improved by 3dB by using the magnetic head having the above-mentioned structure as compared to the conventional structure at the noise ratio (C/N) at 4.5MHz.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic head, and more particularly to a magnetic head that mainly uses single-crystal M n -Z n ferrite as a magnetic core material.

[Prior Art] As high-density magnetic recording is required in magnetic recording and reproducing devices such as VTRs, recording media using magnetic materials with high coercive force, such as meta-V tape, have come to be used. There is.

On the other hand, in order to support such recording media, metal-based magnetic materials with high saturation magnetic flux density, such as amorphous materials and sendust, are used as core materials for magnetic heads that can perform high-density magnetic recording and reproduction. ing.

The structure of a conventional magnetic head using such materials is shown in FIG.

That is, what is indicated by the symbol l in FIG. 7 is a half-core made of a metallic magnetic material with a high saturation magnetic flux density, such as the aforementioned amorphous material or sendust, and the two are butted together to form the magnetic head core, and the winding 2 has been applied.

[Problems to be Solved by the Invention] However, the metal-based magnetic materials used in the magnetic head of the conventional structure as described above have a low resistivity value, have inferior high frequency characteristics compared to Mn-Zn ferrite, and There was also a problem that the wear resistance was poor.

Another problem is that there is a lot of ferrite noise, which is the sliding sound of the magnetic recording medium.

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, in the present invention, a metal magnetic material is placed in the area where magnetic poles for recording and reproduction are generated, and other The part is single crystal M n −
Zn ferrite with SnO2 or T within 5% by weight
A structure using a material containing i02 alone or in combination as a solid solution was adopted.

[Function] When such a structure is adopted, the specific resistance value of the head as a whole can be increased, the high frequency characteristics can be improved, and the wear resistance can also be improved.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

[First Example] In this example, as a result of various experiments, SnO2 was added as a material to improve the characteristics of single crystal Mn-Zn ferrite, which is the material that makes up most of the magnetic core. I chose TiO2.

Addition of these materials improves the wear resistance and high frequency characteristics as described above, allows precision processing, and provides a magnetic head with less ferrite noise.

FIGS. 3 and 4 show the relationship between the amount of addition at 4.5 MHz of a magnetic head, head output, output, and noise ratio (C/N) when Sn'O:2 is added alone.

The output and noise ratios refer to ferrite noise.

As is clear from Figures 3 and 4, when the amount of SnO2 added to single crystal ferrite is within 5% by weight, there is no decrease in output and ferrite noise is reduced. .

Further, the diagrams shown in FIGS. 5 and 6 show the relationship between the amount of addition, head output, output, and noise ratio (C/N) when T i O2 is added alone to single crystal ferrite.

As is clear from FIGS. 5 and 6, when the amount of TiO2 added to the single crystal ferrite is within 5%, there is no decrease in output and ferrite noise is reduced.

Thus, it can be seen that when SnO2 and TiO2 are added alone, output decrease can be prevented and ferrite noise can be reduced.

Therefore, an experiment was conducted to see what kind of results would be obtained when a combination of SnO2 and TiO2 was added to a magnetic head having the structure shown in FIG.

The core indicated by 3.3 in FIG. 1 has a half-core and is made of single-crystal M n -Z n ferrite.

The specific composition is Fe 20352molLM
A mixture of 2z of SnO2 and 0.5z of Ti02 was added to a composition of 30 mo1% of nO and 18 moH of ZnO and dissolved therein.

In addition, as shown in the enlarged view in the appendix of Fig. 1, thin films 4, 4 of a metallic magnetic material such as sendust film are formed with a thickness of 2 m on the abutting surfaces where magnetic poles are generated, and the gap 5 is A Si 02 film with a thickness of 0.31 Lm is interposed in the portion.

What is indicated by the reference numeral 6 is a winding.

Using a magnetic head with such a structure, the C/N ratio at 4.5 MHz was compared with a conventional structure, and the ferrite noise was improved by 3 dB.

Note that SnO2 and other additives other than TiO2 include C.
It has been found that when 0.05% by weight or less of 0.05% or less of V2O5 is added in combination, the high frequency characteristics can be improved.

[Second Embodiment] FIG. 2 explains a second embodiment of the present invention, and in the case of this embodiment, a perpendicular magnetic recording type magnetic head with an integrated auxiliary magnetic pole is shown.

In Fig. 2, the symbol 7 is the main pole, which is made of Co-Zn.
It is made of a metallic magnetic material such as amorphous.

Moreover, what is denoted by numeral 8 is M n -Z n single crystal ferrite, and as mentioned above, T i O2 and S n
02 alone or in combination in an amount of 5% by weight or less, which is added or dissolved in solid solution, and is integrally bonded to the main magnetic pole 7.

The reference numeral 9 indicates a reinforcing glass plate, and the reference numeral lO' indicates a winding wire.

Based on the above structure, the magnetic flux is distributed between the main magnetic pole 7 and the auxiliary magnetic pole 8.
It is possible to perform magnetic recording on the medium by forming a bridge between the two.

Even when applied to a magnetic head having such a structure, the same effects as in the above-described embodiment can be obtained.

[Effects] As is clear from the above description, according to the present invention, in a magnetic head that uses a metallic magnetic material for the portion where a magnetic pole is generated with respect to a magnetic recording medium, the portion that uses a metal magnetic material The other parts are made of single crystal Mn-Zn ferrite, and SnO2 or T is added to this material within 5% by weight.
Because it adopts a structure in which iO2 is added alone or in combination and dissolved in solid solution, the specific resistance value of the single crystal Mn-Zn ferrite part is large, excellent high frequency characteristics, and wear resistance are improved. A magnetic head with low noise can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view illustrating a first embodiment of the present invention;
FIG. 2 is a front view explaining the second embodiment of the present invention, and FIG.
The figure is a diagram showing the relationship between the amount of SnO2 added and the head output.
Figure 4 is a diagram showing the relationship between the amount of S n O2 added, output, and noise ratio, Figure 5 is a diagram showing the relationship between the amount of TiO2 added and head output, and Figure φ is the graph showing the relationship between the amount of added TiO2 and the head output. A diagram showing the relationship between quantity, output, and noise ratio, and FIG. 7 is a perspective view illustrating a conventional structure. 3.3...Magnetic core half-off 4...Metallic magnetic material 5...Magnetic gap 6...
・Winding 7...Main magnetic pole 8...Auxiliary magnetic pole- Patent applicant Canon Electronics Co., Ltd.--1゜Representative Patent attorney Takashi Kato ：°＋；：、″：
;shiichi゛U+ iDokenkoi- Iku-,;-Jmaro

Claims (1)

[Claims] In a magnetic head in which a metallic magnetic material is used in a portion where a magnetic pole is generated with respect to a magnetic recording medium and a single crystal Mn-Zn ferrite is used in other portions, up to 5% by weight of SnO_2 or A magnetic head characterized in that TiO_2 is added alone or in combination to form a solid solution.