JPS6132209A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To obtain the title magnetic head suitable of high-density recording on a floppy disk using a magnetic revolving sheet by uniting a thin-film magnetic head wherein recording and reproduction are carried out by a magnetic thin film formed ona substrate and an erasing head composed of a magnetic material having about the same coefficient of thermal expansion as the substrate to a body. CONSTITUTION:A ferrite magnetic substrate of Ni-Zn ferrite or Mn-Zn ferrite or a metallic magnetic substrate of ''Sendust(R)'' and ''Permalloy(R)'' for example, is used as a magnetic substrate 1, and an insulating layer 2 of SiO2, etc. is coated on the main surface of the magnetic substrate 1. An electrically conductive means 3 such as a strip-shaped metallic conductive layer is formed on the layer 2. Besides, a strip-shaped magnetic layer 4 is coated and formed transversely on the electrically conductive means 3. The thin-film magnetic layer 4 is formed, for example, by vapor-depositing ''Sendust(R)'', ''Permalloy(R)'', or an amorphous magnetic thin film or by sputtering, etc. A nonmagnetic insulating layer 5 such as an SiO2 layer, covering the conductive means 3, intervening between the magnetic substrate 1 and the magnetic layer 4, and used as a gap spacer along with the insulating layer 2, for example, is coated under the thin-film magnetic layer 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a composite magnetic head suitable for use in high-density recording on floppy disks and the like.

BACKGROUND TECHNOLOGY AND PROBLEMS In general, in floppy disks using magnetic rotating sheets, approximately circular tracks are formed to record predetermined data at high density. It is required to reduce the distance from the gap.

Therefore, it is conceivable to use a thin film magnetic head such as the one shown in FIG. 1, which uses thin film technology, as the recording magnetic head. In this conventional thin film magnetic head, as shown in FIG. 1, an insulator 1i1 (21) is formed on a magnetic substrate il1, for example, a magnetic ferrite substrate, and
A conductor means (3) is deposited on top of the conductor means (3).

This conductor means (3) consists of a strip-shaped conductive layer formed, for example, by photolithography, and a strip-shaped thin film magnetic layer (4) is similarly formed across this conductor means (3) by photolithography. be done.

This thin film magnetic T
A non-magnetic insulating layer (5) of 2 m is applied. Then, a non-magnetic protective substrate (6) with excellent wear resistance is adhered to cover the S film magnetic layer (4) via an adhesive (7), and the non-magnetic protective substrate (6) and the magnetic substrate ( 1) The end face of the thin film magnetic layer (4) faces the magnetic medium across
181 is formed by Vr polishing. According to such a configuration, a closed magnetic path is formed by the thin film magnetic layer (4) and the magnetic substrate (11), and the thin film magnetic layer (4) and the magnetic substrate +11 are connected facing the opposing surface (8). Insulating layer (21Te
An actuating magnetic gap g is formed with a gap length regulated by the thickness of l, and the conductor means (3) is the head winding (W is configured).

Since such a 1-layer magnetic head can be formed in a relatively small size, by arranging the erasing spatula 1 adjacent to the +a- film magnetic head, the distance between the gap of the recording magnetic head and the gap of the erasing spatula F can be reduced. can be made relatively small.

However, in recent years, as the areal density of recording has increased, the diameter of the magnetic rotating sheet of floppy disks has become smaller, and there has been a demand for a reduction in the distance between the recording magnetic head gap and the erasing head gap. has been done. In this case, it is possible to separate the layers using a recording magnetic head, but with the trend towards higher density recording, magnetic recording media with high coercive force, for example 1000'Oe to 1500'Oe, are being used, and magnetic When recording on a recording medium, there is a problem in that the previous signal cannot be sufficiently erased by car marking recording.

Purpose of the Invention In view of the above, the present invention is designed to sufficiently reduce the distance between the recording magnetic head gap and the erase spatula 1'' gap, and is suitable for high-density recording on a floppy disk using a magnetic rotating sheet. The purpose is to provide 2nd direction to magnetism.

Summary of the Invention The present invention integrates a magnetic head that performs recording and reproduction using a magnetic thin film formed on a substrate, and an erasing head made of a magnetic material having a coefficient of thermal expansion comparable to that of the substrate. The composite magnetic spatula i° is According to the composite magnetic head of the present invention, the distance between the gear of the recording magnetic head and the gap between the erasing head can be made sufficiently small, and it is possible to perform high-density recording on a floppy disk using a magnetic rotating sheet. can.

Embodiment Now, one embodiment of the composite magnetic head of the present invention will be described with reference to FIGS. 2 and 3. This figure 2 and 3
In the figure, parts corresponding to those in Figure 1 are given the same reference numerals.
A detailed explanation thereof will be omitted.

In the examples of FIGS. 2 and 3, the magnetic (!1 body group 1i (11
For example, a ferrite magnetic substrate of Ni-Zn ferrite, Mn-Zn ferrite, or Sendas L (Fe
-AI-5i alloy) Permalloy (Pe-old thread alloy)
An insulating layer (2) such as 5iCh is deposited on the main surface of the magnetic substrate (1), and a conductor means (3), such as a strip-shaped metal conductive layer, is attached to the main surface of the magnetic substrate (1). It is formed by applying front side deposition such as evaporation or sputtering or surface lithography. Furthermore, this conductor means (
A thin magnetic strip (4) is formed in a band-like manner across 3). This thin film magnetic layer (4) is made by depositing, for example, sendust, permalloy, or an amorphous magnetic thin film.
For example, by sputtering or the like, by front side deposition and by applying photolithography. This thin film magnetic layer (
4) Below is a magnetic substrate (1) that covers the conductor means (3).
A non-magnetic insulating layer (5), for example SS102r, which is interposed between the two and serves as a gap spacer together with the insulating layer (2), is deposited. According to this configuration, as shown in FIG. 1, a closed magnetic path is constructed by the thin film magnetic layer (4) and the magnetic substrate (1), and these thin film magnetic 1 m Tel and 1 m of insulation between the magnetic substrate (]) (
A magnetic gear g having a gap expansion regulated by a thickness of 21+51 is formed, and a crotch magnetic head 11 is constructed with the conductor means (3) as the head winding. Then, 5i (h,
81203, 3iaN4 etc. insulating protective shield (9), and the eraser spatula 1°゛00) is attached to this body (11).
to join and integrate. In this case, the erase head QOI
The core (10a) is the magnetic substrate +1 of the thin film magnetic head H.
A magnetic material having a coefficient of thermal expansion of about 1 is used.

For example, when a Ni-Zn ferrite magnetic substrate is used as the magnetic substrate (1), this Ni-Zn ferrite is used as the core (10a) of the eraser (00), and a Mn-Zn ferrite is used as the magnetic substrate (11). When using a Zn-based ferrite magnetic substrate, the core (
This Mn-Zn ferrite is used as 10a), and in this case glass is used as the bonded body (11).

In addition, if a magnetic substrate (11) is a metal magnetic substrate such as Sendas I- or Permalloy, the erase head +10
The same material is used as the core (10a) of each of the two, and in this case, a metal solder is used as the bonded body (11). In this case, the gap bonding material for the erase head 00) is used whose softening point is lower than the temperature at which the erase head (1ω and thin film magnetic head I) are integrated and bonded.

In this case, the gap direction of the thin film magnetic head H and the gap direction of the erasing head 00) are made parallel to each other, and such track alignment is performed. Further, when the gap width of this thin film magnetic head H is TR, the gap width of the erasing head 00 is T6, and the width of the guard band is TG, it is made such that 'rR<'r, ≦(TR+27G). This is because when TE<TR, there will be unerased parts on the recorded trunk, and when TE>(TR+2TG
), the adjacent trunk will also be deleted.

The surface (8) in contact with the magnetic medium is polished after the thin-film magnetic head H and the erasing head (101) are bonded and integrated; at this time, the shape of the surface (8) in contact with the magnetic medium is approximately spherical.
The highest apex of this spherical surface is made to exist between the top of the gap of the thin film magnetic head H and the center between each gap. If this highest peak shifts toward the magnetic 11I substrate (]) of the thin-film magnetic head H, the erasing spatula F (101) will not hit well,
If an erasing defect occurs and the highest peak shifts from the center between the gears toward the erasing head 00), spacing tends to occur on the thin film magnetic head IJ side that handles recording and reproduction of short wavelengths, resulting in deterioration of recording and reproduction characteristics. In FIGS. 2 and 3, (10b) is the erasing winding, and (10g) is the magnetic gap of the erasing head (10).

This example is structured like ``double series'', and this erasing spatula l''
The core (10a) constituting the OI has a relatively large height and serves as a protective substrate (6) for the conventional thin film magnetic head shown in FIG. 1, so that recording and reproduction can be performed in the same manner as in the conventional case. Historically, in this example, the thin film magnetic head protective substrate (6
Since the erasing head 0ω is provided instead of the recording thin film magnetic head 11, the gap between the recording thin film magnetic head 11 and the erasing head 00) can be made sufficiently small. can perform high-density recording.

Moreover, FIGS. 4 to 10 each show other embodiments of the present invention. To explain this figure 4 to figure 1(), this 4th figure
In Figures to Figures 10, Figures 1, 2, and 3 k2+
The same reference numerals are given to the parts corresponding to iY.

Details are omitted.

FIGS. 4 and 5 show the gap (10g
For example, when ferrite is used as the core (10a), a sender (1-) is provided near the core (10a) with a saturation magnetic flux higher than the saturation magnetic flux BS of the core (10a). In Fig. 4, this thin film core (12) is provided on both sides of this gap (10 g), and in Fig. 5, this thin film core (12) is provided on both sides of this gap (10 g).
This thin film core (12) is provided on one side of g). The other parts of FIGS. 4 and 5 are constructed similarly to those of FIGS. 2 and 3, respectively. It is easy to understand that the same effects as in FIGS. 2 and 3 can be obtained in FIGS. 4 and 5 as well.

In the examples of Fig. 4 to Fig. 1 and Fig. 3, the erasure heso 1゛ (1ω
Set the predetermined azimuth θ on the gear (10g) C] and erase the recording wave island and gap interval.
/+V If leakage occurs to the membrane (1-■), remove the dirt by adjusting the angle that matches the wavelength used.
I tried to erase H.

7 and 81. The thin film magnetic head 11 in the examples of FIGS. 2 and 3, respectively, has two (flit)
(4a) and (4h) The LJ is set up in a 2-rack configuration, and a ζ erasing head (10) is installed corresponding to one track of the 712th track. !-An erasing head (lO) is provided corresponding to each rack. According to the configuration shown in FIGS. 7 and 8, frame recording of a television signal, Multiplayer games such as Feel 1 Record Self are the moderators.

In addition, FIG. 9 shows the pair tff of magnetic media in FIGS. 2 and 3.
+I+i t81 is made small in area so that this contact surface (8), that is, the gap Ie, (10++) can better contact the magnetic medium. Figure 9A
4; l: iE ihi figure, Figure 9B is its side view (
3a) (3b) is the conductor means (
This is end A of 3).

In addition, Figure 10 shows the magnetic substrate (1) in Figures 2 and 3.
) Instead of the non-magnetic substrate (13), for example, a ceramic material 10 is coated with a magnetic thin film of, for example, Sendust, Permal I, I, or an amorphous magnetic thin film by vapor deposition, sputtering, etc., to form the Dobe magnetic core (Ia), Part 1 - is constructed in the same manner as in FIGS. 2 and 3, and according to this construction, the lower magnetic core (1a) and the thin II! ii! &f1! l 1m (4
The thin film magnetic head 11 is constituted by the magnetic head 1, etc., and the same effects as in the examples of FIGS. 2 and 3 can be obtained.

It goes without saying that the present invention is not limited to the 111 embodiments described above, and that various other configurations may be adopted without departing from the gist of the present invention.

Effects of the Invention According to the present invention, the distance between the recording magnetic head gap and the erasing head gap can be made sufficiently small, making it possible to perform high-density recording on a floppy disk using a magnetic rotating sheet.

[Brief explanation of drawings]

Fig. 1 is an enlarged cross-sectional view of an example of an S film magnetic head, Fig. 2 is a cross-sectional view showing an embodiment of the composite nitrogen spatula of the present invention, Fig. 3 is a top view thereof, and Figs. Figure 8+J - L side view showing another embodiment of the present invention, Figure 9A L;1 City view showing another embodiment of the present invention, Figure 9B a side view thereof, Figure 10 The figure is a sectional view showing another embodiment of the present invention. (1) is a magnetic substrate, (4) is a thin magnetic substrate, 011)
is the erase head, (10a) is the core, and (1111 conjugate. Hidemori Matsukuma, i'1r near,,) i, t!゛・
□Hard 1 line Figure 1 6 Figure 2

Claims (1)

[Claims] A thin film magnetic head that performs recording and reproduction using a magnetic thin film formed on a substrate, and an erasing head made of a magnetic material having a coefficient of thermal expansion comparable to that of the substrate are integrated. Composite magnetic head.