JPS62137713A - Magnet-resistance effect type magnetic head - Google Patents

Abstract

PURPOSE:To simplify and miniaturize construction and to reduce cost by disposing plural thin film magnets to an MR element. CONSTITUTION:The MR element 10 consisting of Ni-Fe, Ni-Co, etc., is formed via an insulating layer 15 on a substrate 8 formed with a lower yoke 9. The MR element 10 is formed approximately in parallel with a surface 7a to slide with a tape. The plural thin film magnets 11 are formed via the insulating layer 16 on the MR element 10 so as to have the magnetization direction intersecting orthogonally with the extension direction of the MR element 10. The respective thin film magnets 11 are so formed as to cross, in a rod-like pattern, the MR element 10 and to be approximately equally spaced from each from other. The thin film magnets 11 are so also so constituted that all the magnetization directions thereof are in the equal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetoresistive magnetic head, and more particularly to a magnetoresistive magnetic head that can significantly improve reproduction efficiency.

There are six types of conventional thin film magnetic heads, one of which is the magnetoresistive 1ψ magnetic head (abbreviated as L-FM, R-head). The MR head is used as a second head of the digital audio chief reader (D△') because the high output is not affected by the stray current of the I/A tape when running. The magnetoresistive effect (hereinafter abbreviated as MIld) produced in the magnetic field produces an output proportional to the square of the applied signal Vi! 8 to perform a linear motion corresponding to the waveform W. Conventionally,
As a means for applying a bias magnetic field to the MR probe, (1
) A means for disposing an external magnet 2 at a position near the outside of the IvlR accumulation f1 and applying the magnetic field of the external magnet 2 as a bias magnetic field to the MR element f1 (shown in FIG. 7); (2) bias line; 3 is placed on one side or below the MR tree 1, and the magnetic field generated by the current flowing through the bias wire 3 is connected to the bias magnet S.
means for applying M to the MR cord 1 as ν (as shown in FIG. 8);
(3) MRf, a shield made of conductor diagonally to each child l-
1 to 4 are arranged, and the MR element 1 is a means (so-called barber pole) that allows the current to flow diagonally through the MR element 1.
head. (4) A method (shown in FIG. 10) that utilizes the fact that a fine diagonal groove is provided on the MRjR element 1 or the substrate and a magnetic domain is generated diagonally on this is used. It was getting worse. In each figure, 6a and 6b indicate lead wires, solid arrows indicate the direction of application of bias mW, and dashed arrows indicate the flow of sense current.

Problems to be Solved by the Invention However, in the above-mentioned conventional MR head, for example, (1) an external magnet 2 is used as a biasing means (1 as shown in FIG. 7).
)), a bias magnetic field is applied from the outside to the MR fiducer 1, and the magnetic field affects other than the MR cable r1, demagnetizing the signal recorded on the recording medium, or changing the signal magnetic field. There is a risk of disturbing the MR element f.
There is a problem in that it is not possible to apply a bias magnetic field uniformly by applying a bias magnetic field to the magnetic field. In addition, in the case where the bias line 3 is used as a biasing means (as shown in Fig. 8), a separate current supply source must be provided to supply current to the bias line 3, and since the domain wall is unstable, a Barkhausen・There was a problem that noise occurred frequently. In addition, as a bias means, a short pattern 4 is provided that extends from the a-circle (not shown in Fig. 9), and (4) a fine diagonal pattern 4 is provided.
(71 shown in FIG. 10) eliminates disadvantages such as demagnetizing the signal recorded on the recording medium and requiring a separate current supply source.
There was a problem that a sufficient bias effect could not be obtained for the element 1.

Therefore, an object of the present invention is to provide a magnetoresistive magnetic head that solves the above problems by appropriately disposing a plurality of film magnets for MR hydrogen elements.

Means and operation for solving the problem In order to solve the above problem, in the magnetoresistive magnetic head according to the invention as set forth in claim 1, a plurality of thin film magnets are formed on the magnetoresistive element. did. In addition, in the magnetic R (resistance type magnetic head) according to the invention as claimed in claim 2, a plurality of thin film magnets are placed on the magnetic B (resistance effect element) via an insulator. It was formed diagonally to the direction.

Furthermore, in the magnetoresistive magnetic head according to the invention as set forth in claim 1, the magnetoresistive element is electrically connected to a plurality of thin film magnets that are electrically conductive to each other. It was formed obliquely to the extending direction of the effect element.

In an MR head having a structure in which a plurality of film magnets are formed on a magnetoresistive element (MR hydrogen element),
In an MR head configured to uniformly apply a bias magnetic field to R hydrogen atoms, and in which a plurality of thin film magnets are formed on the M11 probe t obliquely to the extending direction of the MR hydrogen atoms via an insulator,
A bias magnetic field can be uniformly applied to the longitudinal direction of the hydrogen atoms, and the MR hydrogen atoms are electrically connected to each other on the MR:A element to form a plurality of thin film magnets diagonally to the extending direction of the MR hydrogen atoms. This MR head can apply a bias magnetic field uniformly in the longitudinal direction of MR hydrogen atoms, and can also function as a so-called barber pole type MR head.

Embodiment FIGS. 1 and 2 show a first embodiment of a magnetoresistive magnetic head (MR head) according to the present invention.

Note that FIG. 2 represents a cross section taken along line Δ-A in FIG. 1. The MR head 7 shown in both figures is formed using a thin film forming technique such as photolithography, and is used, for example, as a re-F head for multi-track DAT. The MR head 7 generally includes a substrate 8 and a lower yoke 9 formed on the substrate 8. Magnetic relative effect wood (M12
Kiko) 10° thin film...Stone 11. Lead wires 12a, 12b,
The upper yoke 13 and the like are configured by the upper yoke 13 and the like. 1t, board 8
For example, it is a non-magnetic substrate made of lamic or the like, and its top surface has a par 70 and Hings 1~ (σ trademark).

Made of soft magnetic material such as amorphous, Moekata yoke 9
a and the rear] - a lower yoke 9 composed of a body 9b is formed. This pair of yokes 1' (A9
a, gl) is formed in the L part so as to sandwich the MR side: 10, and between the phases η
11 tubes 14 are formed.

An insulating layer 15 is formed on the substrate 8 on which the lower yoke 9 is formed.
M consisting of N 1-Fe, N i -Co, etc.
R, 4 elements 10 are formed, and this MR element 10 has 7
- 1'f4 is formed substantially parallel to the moving member 7a. Furthermore, a plurality of thin film magnets 11 are formed on the MR element 10 with an insulating layer 16 interposed therebetween so as to have a magnetization direction perpendicular to the direction in which the MR element 10 extends. A plurality of thin film magnets 11 are formed at once using photolithography technology, and each thin film magnet 11 is arranged horizontally across the MR Soryo 10 in a +1 pattern, and at approximately equal intervals. It is formed. Further, the magnetization direction of each film magnet 11 is set to be in the same direction as shown in FIG. The A9 film magnet 111 is formed with an upper yoke 13 made of permalloy, Senges 1-.
5.16 was opened as Gi
and upper yoke 13 are disposed opposite to each other with insulating layers 15 and 16 in between, forming a magnetic gap '18 (hereinafter this magnetic gap will be referred to as a front gap).

In the MR head 7 having the above configuration, the tape 1fj moving surface 7a
When the magnetic tape 19 (indicated by the dashed line 1j in FIG. 2) comes into contact with the magnetic tape 19 and moves F, the signal magnetic field recorded on the magnetic tape 11 is transferred to the MRA via the yoke half 9a.

Guided by child 10. A bias magnetic field is uniformly applied to the MR element 10 by the thin film magnet 11 to perform JV (this will be explained in detail later), and since a sense current has been applied to the MR element f10 in advance, the signal magnetic field causes MR The element 10 changes its electrical resistance value and thereby generates a reproduction signal according to the recording magnetic field of the magnetic tape 19. The return signal @W1'E forms a closed magnetic path through the yoke half 9b and the upper yoke 13 to the front gap 18. Therefore, the MR head 10 transmits a reproduction signal that changes in accordance with the recording magnetic field of the magnetic chip 71 to the lead wire 12a.

12bJ: Functions as a reproducing head depending on the extraction size.

Here, attention will again be paid to the plurality of thin film magnets 11 formed on the MR element 10 with the insulating layer 16 interposed therebetween, and will be further described in detail below. As mentioned above, the thin film magnet 11 is formed all at once on the MR element 10 using lithography technology, and its shape is a rod-like pattern so as to cross the MR element 10. The thin film magnets 11 are formed at substantially equal intervals. Therefore, the thin film magnet 11 is
By applying a substantially uniform bias magnetic field to the entire MRA element 10, the reproduction efficiency of the MRA element 10 can be improved. In other words, if the 15 bias magnetic field is not uniformly applied to the MR resistor 10, the MR due to the bias magnetic field
Partial variations occur in the 747;↑ direction of the magnetization within the cable r10, making it impossible to perform linear magnetoelectric conversion corresponding to the applied No. 13 magnetic field, resulting in a decrease in Q regeneration efficiency. By configuring the II9 magnet 11 as described above, a uniform bias magnetic field can be applied to the IRi element 10, and the MR element 10 can generate a good reproduction signal in response to changes in the magnetic field W. Therefore, the regeneration efficiency can be improved. In addition, each thin magnet 11 [muff 4] is used to create a series of MR heads 10 using lithography technology.
Since it is formed all at once in the M manufacturing process, especially MR
Product costs can be reduced without complicating the manufacturing process of the head 10. Historically, since each thin film magnet 11 has a small shape, it has been difficult to reduce the diameter of the MR head 10.

3 and 4 show a second embodiment of the MR head according to the present invention. Figure 4 shows a cross section taken along the line B--B in Figure 3, and the same components as in the first embodiment are designated by the same reference numerals and their explanations will be omitted. The MR head 20i shown in both figures has each thin film magnet 21
14 that the MR element 10 is arranged and formed obliquely to the extending direction of the MR element 10 (longitudinal direction of the MR element 10). Each a9 film magnet 2
1 is disposed diagonally, a bias magnetic field is applied to the magnetic field 10 in its width direction, and at the same time, a bias magnetic field 1d is applied to its longitudinal direction. This is different from the case where the axis of easy magnetization of the MRA element 10 is tilted toward Ct*, as in the conventional configuration in which a bias magnetic field is applied only in the width direction of the MRX element 10 (7th, MR element 1).
Since a magnetic field is applied in the longitudinal direction, the domain wall in the MR module 10 will suddenly move. - Noise generation can be prevented.

, 1tLl to prevent Barkhausen noise! It is preferable that the angle angle of each film magnet 21 with respect to the extending direction of the MRR element 10 is approximately 45 degrees, but is not limited to this.
It is effective in preventing Barkhausen noise in the angle range of ° to 60 °. Therefore, by configuring the MR head 20 as described above, noise will not be mixed into the reproduced signal, and a good 100l+f8 signal can be obtained by 1!7. If the MR head 20 is configured as described above, the entire MRR element 10 has a uniform 4i bias Vl! It goes without saying that the regeneration efficiency is greatly affected by the application of L L 'l.

FIG. 5 shows a third embodiment of the MR head according to the present invention.

Note that the same components as the MR head 20 shown in the second embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted. The MR head 22 shown in FIG.
It is characterized in that the stacked cloves 10 are arranged and formed obliquely with respect to the extending direction.

The thin film magnet 23 is, for example, a hard laminated bamboo pattern made of a cardioelectric alloy containing Co as a constituent, and is formed directly on the MRR element 10 and electrically connected to the MR element 10. Further, each thin film magnet 23 is arranged at a predetermined angle (approximately 30° to 60°) with respect to the extending direction of the MRR element 10, as shown in an enlarged view in FIG.
It is formed at an angle. In the MR head 22 having the configuration F, since the thin film magnet 23 is formed obliquely to the extending direction of the MRR element 10, the bias Ia'/7 is applied to the MR element 10 as described in the second embodiment. Since the voltage is applied in both the width direction and the longitudinal direction, the magnetic domains and their domain walls within the MR element 10 are stabilized, and Barkhausen noise can be prevented from occurring. In addition, a thin film magnet 2 having conductivity
3 is electrically connected to the MRR element 10, and
Since the MR head 22 is formed obliquely to the extending direction of the barber pole, the MR head 22 has the same function as a so-called barber pole MR head. Zunawara lead wire 12a, 1
The sense current (dimensions indicated by arrows in Fig. 6) flowing through 2b is the same as the conductivity of the A film magnets 23 (1 J), and the current between each adjacent thin film magnet Ei 23 is 1 J. 6. As shown by the arrow 1 [ ] in Figure 6, the strip 1 is placed in the direction in which the thin film magnet 23 extends.
It also flows in the perpendicular direction. The flow direction of this 7Fi flow 1o is inclined at a predetermined angle with respect to the easy magnetization axis direction of the MR element 10 (the direction in which the thin film magnet 23 extends if it is assumed that the thin film magnet 23 does not generate a magnetic field). , M.R.
A state in which a bias magnetic field is applied to the R element 10 and a state in a snowy mountain can be realized in the MR system T-10. Therefore, MR
In the head 22, the bias magnetic field due to the force W of the film magnet 23 and the bias action of the barber pole combine to create a bias effect on the MRR element 10. . Therefore, since the shape of the film magnet 23 can be made small and the strength of the magnetic W can be made small, the MR head 2
It is possible to reduce the size of the magnetic chip 2, reduce leakage of the bias magnetic field to the outside, and eliminate negative effects on the magnetic chip 119, such as the signal magnetic field recorded in one magnetic chip 7 being tampered with.

()3 MR head according to each of the above embodiments 7.20°22
According to 11, the configuration of applying a bias current to the bias line is no longer necessary, and the configuration of the MR head 7°20.22 can be simplified and miniaturized. It is possible to reduce the product cost.

Effects of the Invention As described above, according to the MR head of the present invention, fVIR
In order to apply a bias magnetic field to the MR head, it is necessary to provide a shaped magnet, a bias line, and a means for supplying current to the bias line.
It is easy to miniaturize the ivl R head and reduce the cost by 1, and multiple thin film magnets can be
Since it is formed all at once using lithography technology 4, there is no rotation during the formation process (in addition to this, multiple magnets are placed on the M1 ma Z 8). Therefore, it is possible to uniformly apply a bias magnet W to the entire MR magnet, which increases the regeneration efficiency and generates stable regeneration. By forming it obliquely to the direction, MR
The magnetic domains and domain walls in the cell are in a stable state, and the impulsive Barkhausin noise light ([11-shi blue,
Furthermore, the thin film magnet is electrically connected to the M R element to obtain Tm'
By forming the M R element obliquely in the extending direction,
As mentioned above, Barkhausin noise can be prevented and the fVIR head can also function as a so-called barber-pole type MR head, and the MR hydrogen element is generated by the self-bias due to the barber-pole type and the magnetic field provided by the thin-film magnet. The bias magnetic field works to compensate and/
First, it is possible to reduce the strength and shape of the magnetic field of the thin film 16 magnets, which reduces the leakage magnetic field of the bias magnet W (the impact on the recording medium). If the head can be made smaller, it will improve the quality of the snow.

[Brief explanation of drawings]

FIG. 1 shows the first embodiment of the MR head according to the present invention.
Figure 2 is a sectional view taken along the line a3LJ to △-8 in Figure 1, Figure 3 is a plan view of the second embodiment of the MR head according to the present invention, and Figure 4 is the same as Figure 3. 5 is a top view of the third embodiment of the MR head according to the present invention, and FIG. 6 is a cross-sectional view taken along line 13-B of the MR head, and FIG. A diagram showing the structure of the thin film shoganite in the vicinity of the thin film,
FIGS. 7-'; FIG. 1510 is a diagram showing the main part of a conventional MR head for explaining a means for applying a bias magnetic field. 7.20.22... MR head, 8... Board, 9...
・Lower yoke, 9a, 9b-a-ri 16 pieces, 10-M
R hydrogen element 11.21.23...thin film magnet, 13...
Part 1 Yoke, 14...Senry Gap, 15゜1
6.17... Insulating layer, 18... Freon 1~.Gap, 19... Magnetic tape. Patent applicant: Victor Japan Co., Ltd. Figure 6

Claims (5)

[Claims] (1) A magnetoresistive magnetic head characterized by forming a plurality of thin film magnets on a magnetoresistive element. (2) A magnetoresistive magnetic head characterized in that a plurality of thin film magnets are formed on a magnetoresistive element with an insulator interposed therebetween, obliquely to the direction in which the magnetoresistive element extends. (3) The magnetoresistive magnetic head according to claim 2, wherein the angle of the thin film magnet with respect to the extending direction of the magnetoresistive element is 30° to 60°. (4) Magnetism characterized by forming a plurality of thin film magnets on a magnetoresistive element and electrically connected to the magnetoresistive element and obliquely with respect to the extending direction of the magnetoresistive element. Resistance effect magnetic head. (5) The magnetoresistive magnetic head according to claim 4, wherein the angle of the thin film magnet with respect to the extending direction of the magnetoresistive element is 30° to 60°.