JPS6157017A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To improve the reliability in the sliding stage and to decrease magnetic resistance by attaching a magnetic metallic film which has specific saturation magnetic flux density and constitutes a main magnetic circuit into an Ni- Zn ferrite which is an auxiliary magnetic circuit. CONSTITUTION:The decreased magnetic resistance and improved mechanical reliability are resulted by using Ni-Zn ferrite to constitute a C-core 4 and an I-core 5 which are the auxiliary magnetic circuit. Both sides of a magnetic gap are a high B10 magnetic metallic film 7 which is the main magnetic circuit and therefore the sure writing to a recording medium having high coercive force is made possible. In such a case the film 7 which is formed within 30-40mum thickness at the most is industrially advantageous and therefore the metallic film of >=7,000G is preferable as B10. The production of the magnetic head having the high saturation magnetic flux density, decreased magnetic resistance and high reliability in the sliding stage is thus expected.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a composite magnetic head.

BACKGROUND ART Conventionally, as magnetic head materials, metal materials such as permalloy, sendust, amorphous alloy, and ferrite, which is a metal oxide, have been used.

Although the former has high magnetic properties, these materials have the disadvantage of not being able to withstand precise processing. Although precision machining is possible in the latter case, it has the drawbacks of being easily chipped when the head slides and having poor magnetic properties.

Problems to be Solved by the Invention As the coercivity of recording media increases, a magnetic head made of a material with a high saturation magnetic flux density is required to reliably write information through the groove. However, in Mn-Zn or Nt-Zn ferrite, which is a conventional magnetic head material, B+o, which usually indicates the magnitude of magnetic flux density, is
The limit was 5000 to 5500G for n-ferrite, and 4000G for NtZn ferrite.

Furthermore, regarding reliability during sliding with the recording medium surface,
Ni-Zn ferrite is less likely to chip and has relatively high reliability, but Mn-Zn ferrite has the disadvantage of being easily chipped and has poor reliability.

On the other hand, for metal magnetic materials, B+o is 10000G
can easily be obtained. However, the metal material Ot1 is in a so-called bulk form, and precision machining is extremely difficult, and it is often difficult to use it in magnetic heads that require precision machining.

On the other hand, precision processing is possible by using the method □ to create a riilD film, such as sputtering, vapor deposition, or plating, using metal magnetic f-no-1 materials, but in this case, the film cannot be thickened, and therefore 1 has the disadvantage that the resistance becomes large.

Means for Solving the Problems The present invention solves the above problems! In addition, a metal magnetic film with a high saturation magnetic flux density of -B lees ≧70'60G or more, which constitutes the main magnetic circuit, is suspended over the NiZn ferrite, which is the secondary magnetic circuit, and a magnetic field is formed between the metal magnetic P1 films. This composite magnetic head has a head chip with a gap embedded in a slider made of non-magnetic ceramic with high mechanical and mechanical reliability.

Action:, 7□It has 4 side effects. Magnetism, path 1. , Configuration 1: The head chip, which constitutes the main magnetic circuit with a metal porcelain bamboo material diagonal with a high saturation magnetic flux density near the magnetic gap, is embedded in a slider that has even higher mechanical reliability. A magnetic head with low resistance and high reliability during sliding can be obtained.

Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows the configuration of a composite magnetic head according to an embodiment of the present invention, in which 1 is a slider, 2 is a head dip, and 3 is a glass plate for embedding and fixing the head depth 2 in the slider 1. It is.

As slider 1, Tica O has high mechanical reliability.
3. By forming it from AfL203-TtC, Zr02, etc., it can have the best reliability during sliding.

FIG. 2 shows a head chip embedded and fixed in the slider 1 shown in FIG. ll7 are adjacent to each other and are bonded via a magnetic gap 6. In this case, the chip thickness t is 0.2 to O1 due to the handling and manufacturing of the core depth.
, 3 mm, and the chip width W for installing the winding S+window 8 is 3 to 41IIIh<the limit. This size is by no means a negligible area from the viewpoint of mechanical reliability when the magnetic head rotates. Therefore, as a material constituting the secondary magnetic circuit, Nt-Zn ferrite, which has high mechanical reliability, is better than Mn-Zn ferrite.

When a magnetic head having this configuration is compared with a conventional example, the advantages of the composite magnetic head according to the present invention are obvious. , the magnetic head shown in FIG. 3 as a conventional example is made entirely of Nt.
Slider 9 made of 7n or Mn-Zn ferrite. Although it is a monolithic type in which the C-shaped lower 10 is joined with the glass glass 1, since the Bn is ≦5500G, it is not suitable for use in recording media with high coercive force.

Further, in the slider shown in FIG. 1, a C-shaped core 12 made of Mn-Zn or Ni 7n ferrite shown in FIG. In the case where the head chip 2', which is formed by bonding the A 13 with the A 13 through the gap 14, is embedded and fixed, the mechanical reliability is improved somewhat, but the drawback of low B(l) remains.On the other hand, as shown in FIG. If the C-shaped core 4 and I-shaped core 5 are made of a non-magnetic material with the highest mechanical strength, similar to the slider 1, the thickness of the metal film 7 will be 30 to 40 mm.
It is not preferable to increase the thickness to more than .mu.m because it takes a long time, resulting in a chip with a thin film thickness and large magnetoresistance.

Therefore, as in this embodiment, the C-shaped core 4, which is the auxiliary magnetic circuit. Constructing the I-shaped core 5 from Nt-7n ferrite is significant in order to reduce magnetic resistance and increase mechanical reliability.

Further, since both sides of the magnetic gap 6 are high Bn metal magnetic films 7 which are the main magnetic circuit, writing can be reliably performed on a high coercivity recording medium. In this case, as mentioned above, the thickness of the metal magnetic film 7 is at most 30 to 40 μm.
Since it is industrially advantageous to keep the Bx at 700
A metal film of 0G or higher is desirable.

(More than the effects of the invention) As mentioned above, the present invention has high saturation VT! This has the effect of making it possible to create a magnetic head with low flux density and magnetic resistance, and with high reliability during sliding.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a composite magnetic head according to an embodiment of the present invention, and FIG. 2 shows the slider shown in FIG. ll
FIG. 3 is an enlarged perspective view of the attached head chip, FIG. 3 is a perspective view of a conventional magnetic head, and FIG. 4 is an enlarged perspective view of the conventional head chip. 1...Slider, 2...Head tip, 4...
C-shaped core, 5...■-shaped core, 6...magnetic gap,
7... Metal magnetic film, 8... Winding window.

Claims (1)

[Claims] A metal magnetic film with a high saturation magnetic flux density of B_1_0≧7000G, which constitutes the main magnetic circuit, is attached on Ni-Zn ferrite, which is the secondary magnetic circuit, and a head chip with a magnetic gap between the metal magnetic films is machined. A composite magnetic head that is embedded in a slider made of highly reliable non-magnetic ceramic.