JPH01253804A - Magnetic head - Google Patents

Abstract

PURPOSE:To eliminate generation of noises and to obtain sufficient reproduced output by interposing a thin film of a nonmagnetic spacer only in the gap forming part and butting the thin high saturation magnetic flux density film of one core and the other magnetic material core and integrating the same to form a coiling leg part. CONSTITUTION:The core 11 of the thin high saturation magnetic flux density film is adhered by sputtering over the entire core joint surface of a nonmagnetic material core base body 10. The other core 12 consisting of a ferromagnetic material is stuck with the thin film SiO2 16 of the gap spacer only in the top end part between track grooves for forming the magnetic gap after adhering glass 14, 14 are previously embedded into the track grooves 13, 13, then this core is butted against the thin film core 11. The central leg part 17 including a back gap 18 is formed by directly butting the thin film core 11 and the ferromagnetic material core 12 against each other and joining and integrating these cores so as to pinch and stick the coil 19. The sufficient reproduced output is thus obtd. without including the noises in the output waveforms in such a manner. In addition, the exfoliation, unequal wear, etc., of the thin film in the sliding contact of the completed head with a medium are prevented as well.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to a magnetic head used in devices such as FDDs that perform high-density magnetic recording.

Follow me! u11 In FDDs and the like that require high-density magnetic recording, magnetic materials with high coercive force (HC) and high saturation magnetic flux density (Bs) are realized in magnetic disks as recording media. On the other hand, magnetic heads for magnetic disks are expected to use sendust alloy or amorphous cores instead of the conventional ferrite cores in order to minimize the magnetic saturation of the core material.
Development is underway. However, the above-mentioned Sendust alloy has a low Vickers hardness, easily causes sliding wear with a magnetic disk, and has an extremely low specific resistance, so it has drawbacks such as poor high frequency characteristics.

So, for example, the document rlEEEE TRANSACTI
ONS ONMAGNETIC5J, NAG-18
MIG head (Metal 1nGaP H
ead) was proposed and began to be put into practical use.

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By the way, as shown in FIG. 7, the above-mentioned MIG head is manufactured by forming thin films 3 and 4 of sendust alloy or the like with a high saturation magnetic flux density on the gap-opposing portions of the ferrite core substrates 1 and 2 to form a gap such as 5i02. sandwiching the spacer film 5,
Providing the magnetic gap 6 causes the following problem.

That is, in this case, in addition to the original magnetic gap 6 of the head, the thin film 3 and the ferrite core substrate 1 are disadvantageously
A pseudo gap is also formed between the thin M4 and the core base 2, and as a result, noise is included in the output waveform when the head reproduces data. Then, F.D.
In a D head or the like, errors occur in the reproduced signal, impairing faithful reproduction characteristics. However, if you try to construct a closed magnetic path other than the magnetic gap using only the thin film 3.4 without using the ferrite cores 1 and 2, not only will it be difficult to manufacture the core, but the magnetic resistance setting of the head will be insufficient. This tends to cause a new problem, which in particular causes a drop in the reproduced output signal.

This invention is proposed to solve the above-mentioned conventional problems. In this invention, one of the ferrites conventionally used as a core substrate is made of a non-magnetic material such as ceramic, and a high saturation magnetic flux density thin film such as Sendust alloy is formed on the joint surface, and the other ferrite is made of a non-magnetic material such as ceramic. , similar to the conventional method, a track groove that defines the track width is formed and the track groove is molded with glass.
The cores of one and the other are glass-welded.

Moreover, in this invention, all of the above-mentioned conventional problems are solved by making the back gap part where the high saturation magnetic flux density thin film of one core and the ferrite of the other core directly butt and integrate into a coiled leg part. It is something.

According to the present invention, only the core of the high saturation magnetic flux density thin film and the core of the ferrite face each other in the vicinity of the magnetic gap portion, and no pseudo gap is formed.
Noise is no longer included in the output waveform. Further, according to the present invention, the back gap portion is formed by joining the high saturation magnetic flux density thin film core and the ferrite core to form the coil winding leg portion, so that the closed magnetic path of the head is formed only by the high saturation magnetic flux density thin film. Therefore, it is possible to obtain magnetic resistance that provides sufficient reproduction output. Furthermore, in this invention, since the high saturation magnetic flux density thin film can be formed on the entire surface of the non-magnetic substrate to be bonded, mechanical adhesion strength can be guaranteed, and thin film peeling and uneven wear can be avoided when the completed head slides into contact with the medium. can also be prevented.

1 and 2 are a front view showing a slice cross section of a single gap type FDD magnetic head showing an embodiment of the present invention, and a plan view showing a medium sliding surface.

First, 10 is a non-magnetic core substrate made of CuTiO2, BaTiOz, or crystallized glass. Reference numeral 11 denotes a high saturation magnetic flux density thin film core made of sendust alloy which is sputtered over the entire core joint surface of the core base 10. 12 is M n −Z n ! which is the same as the conventional one. l The other core is made of ferromagnetic material such as crystal ferrite, and the track width Tw
A low melting point adhesive glass 14.14 is buried in the track grooves 13.13 defining the magnetic gap 15, and a gap spacer thin film 5i021B is adhered only to the upper end between the track grooves forming the magnetic gap 15. 1
This is compared with 1. Reference numeral 17 indicates that the sendust thin film core 11 and the ferrite core 12 are directly abutted against each other to be joined and integrated, and a coil 19 shown by a thick broken line is sandwiched between the legs at the center including the bank gap 18. - After sandwiching the coil 19, the back bar shown by the dotted chain line 20 connects the lower end 22 of the outer leg 21 of the ferrite core 12 and the lower end 23 of the central leg by magnetically connecting the magnetic head. serves as a yoke to complete the closed magnetic circuit.

In order to manufacture a magnetic head having the above-described structure, the following steps may be performed. First, as shown in FIG. 3, after the bonding surface of the non-magnetic core base 10 is well polished, a sendust alloy thin film 11 is deposited on the entire surface by sputtering to prepare one core block. Next, as shown in Figure 4, M
A Zn ferrite core block 12 is prepared, and track grooves 13, 13 . . . . A V-groove 24 for an adhesive glass reservoir is formed by cutting in the longitudinal direction. after that,
As shown in FIG. 5, the ■groove 24 and the track groove 13.13.
. . . Then, a low melting point adhesive glass 14 such as lead glass is molded, the joint surface is polished again, and a gap spacer thin film is applied to the band-shaped end extending from the glass buried part of the track groove to the part where the magnetic gap is to be formed. 5izzle is applied. Then, as shown in FIG. 8, the core blocks 10 and 12 are butted against each other and heated to join them, and each leg is cut and formed as shown by the two-dot chain line, and the thin wires 25, 25 . ... to obtain a core assembly as shown in FIG. The subsequent steps are the same as conventional ones, so their explanation will be omitted.

The FDD magnetic head described above has a magnetic gap of 15
Since the adhesion interface between the nonmagnetic core base 10 and the high saturation magnetic flux density thin film core 11 which are adjacent to each other is not a bonding surface between the magnetic materials, it does not create a pseudo gap and does not distort the output waveform. Then, in the pack gap 18, the high saturation magnetic flux density thin film core 11 and the ferrite core 12 are joined and integrated, so when the coil 19 is wound around the leg part 17, the leg part 17 becomes a suitable magnetic core, and the closed magnetic circuit is formed. The magnetic resistance can be set sufficiently low. Moreover, high saturation magnetic flux density thin film core 11
Since it is sandwiched between the non-magnetic core base 10 and the ferrite core 12, it is extremely firmly fixed.
Even when the floppy disk and the magnetic head are in sliding contact, the mechanical adhesion strength is sufficient.

Although the above embodiment shows the case of a magnetic head for FDD, the invention can also be applied to other perpendicular recording heads, etc. In this case, the high saturation magnetic flux density thin film core is made sufficiently thin. This can be achieved by setting the end of the ferrite core facing the gap in a shape that protrudes by the same amount as the gap depth.

m is 4. According to the present invention, not only does the generation of noise in the output waveform due to the pseudo gap conventionally included in the MIG head be eliminated, but also the reproduced output is sufficiently guaranteed, so that the reliability of the magnetic head for FDD can be improved. Realize. Moreover, since the high saturation magnetic flux density thin film core is sandwiched between the mating core and the non-magnetic core of the thin film forming base, separation or damage due to the medium sliding contact of the high saturation magnetic flux density thin film core is prevented, and the head It is also excellent in terms of longevity and maintenance and inspection, and can greatly contribute to its practical application.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 show an FDD showing an embodiment of the present invention.
FIGS. 3 to 6 are perspective views of a core block for explaining the process of manufacturing the magnetic head of this embodiment, and FIG. 7 is a front view of a conventional single-gap magnetic head.
FIG. 3 is a cross-sectional view showing a magnetic gap portion of the IG head. 10... Non-magnetic core, 11... High saturation magnetic flux density thin film core, 12... Magnetic core (ferrite), 13... Track groove, 15... Magnetic gap, 16... Gap Spacer thin film, 18... Pack gap portion, 19... Coil. No.] :ku

Claims (1)

[Claims] One non-magnetic core having a thin film of high saturation magnetic flux density material adhered to the bonding surface and the other magnetic core having track grooves defining track width formed therein to form a gap. It is characterized by having a coil-wound leg portion in which the thin film of high saturation magnetic flux density material of one core and the magnetic core of the other core are butted and integrated. magnetic head.