JPS61188711A - Magnetic head - Google Patents

Abstract

PURPOSE:To eliminate a step difference caused by an abrasion of a base body and a metallic magnetic thin film, and to dissolve the deterioration in a mag netic head characteristic thereby by constituting a sliding surface of a magnetic recording medium, of, for instance, glass, etc. which are apt to be worn, compar ing with the metallic magnetic thin film. CONSTITUTION:Glass layers 9, 10 are formed to a prescribed thickness on the slide-contact side to a magnetic recording medium of the first core base body 4 and the second core base body 7. As for a material quality of this glass layer, for instance, that which is shown in a table 1 is given, and glass A is a material which is apt to be worn, comparing with a high B5 material. In such a manner, a step difference between the core base bodies 4, 7 and metallic magnetic thin films 6, 8 can be set to '0', dust, etc. do not collect, and the factor for deterio rating the electromagnetic conversion characteristic can be dissolved.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic head, and particularly to a magnetic head comprising a core substrate and a metal magnetic thin film having a high saturation magnetic flux density deposited on a side surface of the core substrate facing the magnetic gap. [Prior Art] FIG. 3 is a perspective view of this type of magnetic head.

This magnetic head includes a first core half 1 and a second core half 2.
and an excitation coil (not shown) wound around the core groove 3 formed in the first core half 1.

The first core half 1 is composed of a first core base 4 and a first magnetic thin film 6 made of a metallic magnetic material having a high saturation magnetic flux density and deposited on the side facing the magnetic gap 5. ing. The second core half 2 similarly includes a second core base 7 and a second magnetic thin film 8 made of a metallic magnetic material having a high saturation magnetic flux density and deposited on the side opposite to the magnetic gap 5. It is configured.

As the material for the first core substrate 4 and the second core substrate 7, single crystal manganese-zinc ferrite is preferred because it has few pores in the substrate and has a dense crystal structure. On the other hand, the first magnetic thin film 6 and the second magnetic thin film 8
As the material, a high or amorphous magnetic material is used. Specifically, examples of crystalline magnetic materials include iron-aluminum-silicon alloys, iron-silicon alloys, and iron-nickel alloys. On the other hand, the amorphous magnetic material is an alloy consisting of one or more elements selected from the group of iron, nickel, and cobalt, and one or more elements selected from the group of phosphorus, carbon, boron, and silicon. , or containing these as main components, aluminum, germanium, beryllium, tin, indium, molybdenum,
There are alloys to which elements such as tungsten, titanium, manganese, chromium, zirconium, hafnium, and niobium are added, and alloys containing cobalt and zirconium as main components and the above-mentioned additional elements.

In this way, a half-core core 1.2 made of a composite material of a core substrate 4.7 made of single-crystal manganese-zinc ferrite and a metal magnetic thin film 6°8 formed on the sides thereof by vapor deposition or sputtering was used. In the magnetic head, the core substrate 4
．． The wear rate of the magnetic thin film 6°8 is much faster than that of the magnetic thin film 7.

Therefore, the conventional magnetic head was designed to protect the metal magnetic thin film 6.8 with a core substrate 4.7 having excellent wear resistance.

However, even if the core substrate 4.7, which has a slow wear rate, is close to the metal magnetic thin film 6.8, the surface of the metal magnetic thin film 6.8 (
Since the magnetic recording medium slides into contact with the end surface (end surface) with a certain contact pressure, it does not serve to protect the metal magnetic thin film 6.8.

Rather, by using the core substrates 4 and 7, which have a slow wear rate, the difference in wear rate with the metal magnetic thin film 6.8 becomes larger.
During use of the magnetic head, the sliding surface of the metal magnetic thin film 6.8 wears out before that of the core base 4.7, and
A step is created between the core base 4.7 and the metal magnetic mM6.8. Since the metal magnetic thin film 6.8 is thin and the core substrate 4.7 is arranged on both sides, if a step is formed as described above, the magnetic recording medium and the metal magnetic image 1116.8 will be separated. The spacing loss between the end face and the end face becomes large, and electromagnetic conversion characteristics such as reproduction output deteriorate.

Further, if a step is formed between the core base 4.7 and the metal magnetic thin film 6.8, dust and the like tend to accumulate, which also causes deterioration of the electromagnetic conversion characteristics.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a magnetic head having excellent electromagnetic conversion characteristics.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a magnetic recording medium sliding contact surface of a base supporting a metal magnetic thin film having a high saturation magnetic flux density, which is made of a material that is more easily worn out than the metal magnetic thin film, such as glass. It is characterized by the fact that

〔Example〕

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the invention. The difference in this figure from the conventional example shown in FIG. 3 is that a glass layer 9.10 is formed to a predetermined thickness on the side of the first core base 4 and the second core base 7 that come into sliding contact with the magnetic recording medium. The point is that

The material of this glass layer is as follows, for example: Composition Table 1 Composition Table 2 FIG. FIG. 3 is a diagram showing the relationship between the running time of a high B3 material made of a high quality alloy and the amount of wear of each material. As is clear from this figure, glasses A and B are materials that wear more easily than high Bs materials.

Each magnetic head having the configuration shown in FIG. 1 was manufactured.

And Hc is 1.500ee, Br is 1.600G
The magnetic head was brought into contact while rotating a magnetic disk with a coating film thickness of 1.5 μm, and after continuous sliding contact for 24 hours, the difference in level between the core base and the metal magnetic thin film was removed using a Taliste pump. As a result of the measurement, the level difference was zero. Furthermore, the head output was measured at 40 KBPI after 24 hours of sliding contact, and the result was a 3 dB increase compared to the conventional magnetic head.

Although this test was conducted using an amorphous magnetic material as the metal magnetic thin film, similar effects can be obtained with crystalline magnetic materials.

Similar effects can also be obtained with ZnO-based glass.

Although glass was used in the above embodiment, it is also possible to use various other plastics.

〔Effect of the invention〕

The present invention has the above-described structure, and it is possible to eliminate the difference in level due to wear between the base and the metal magnetic thin film, eliminate the resulting deterioration in magnetic head characteristics, and provide a magnetic head with stable performance. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention, FIG. 2 is a wear characteristic diagram of various materials, and FIG. 3 is a perspective view of a conventional magnetic head. 1...1st core half day off, 2...2nd core half day off, 4
...First core half-off, 5...Magnetic gap, 6.
. . . 1st magnetic thin film, 7 . . . 2nd core substrate, 8. Second magnetic thin film, 9.10 . . . Glass layer. Figure 1 Figure 3

Claims (1)

[Scope of Claims] 1. A magnetic head in which two base bodies each having a metal magnetic thin film having a high saturation magnetic flux density formed on their surfaces are joined to each other with a non-magnetic material in between so that the metal magnetic thin films face each other, A magnetic head characterized in that a sliding contact surface with the basic magnetic recording medium is made of a material that is more easily worn than the metal magnetic thin film. 2. A magnetic head according to claim 1, wherein the base body is made of glass.