JPS60107718A - Thin film reproducing head - Google Patents

Abstract

PURPOSE:To reduce a leakage magnetic flux (cross feed) noise by constituting so that a width between outside edges in the width direction of a thin film electric conductor becomes smaller than a length in the lengthwise direction of a magneto-resistance element, at a place separated by a prescribed length or more in the lengthwise direction of the thin film electric conductor from the magneto-resistance element. CONSTITUTION:A width between an outside edge 12a in the width direction of a left side thin film electric conductor 12 and an outside edge 13a in the width direction of a right side thin film electric conductor is made smaller than a length in the lengthwise direction of a magneto-resistance element 11 at a place separated by a prescribed length or more in the lengthwise direction of the thin film electric conductors 12, 13 from the magneto-resistance element 11, and an area placed between a line for dividing into two a width of the left side thin film electric conductor 12 and a line for dividing into two a width of the right side thin film electric conductor 13 is narrowed. The greater part of a leakage magnetic flux from an adjacent recording head (not shown in the figure) passes through a magnetic air-gap expanded than before of the outside of a loop constituted of the left side thin film electric conductor 12, the magneto-resistance element 11 and the right side thin film electric conductor 13, therefore, a cross feed noise can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin film reproducing head for air recording, which can easily narrow the track and is less affected by leakage from the recording head (i11 bundle (crossfeed)).

In order to make magnetic recording devices compact and large in capacity, color;>
aa, i 1ψ-jiIL ii 1? Shikake; 4 steps to 1 to 2? In order to realize f'Lft, thin film magnetic heads that can easily be made narrower have recently been polished and put into practical use. In thin film reproducing heads, the fr(l!+Song response element type, which utilizes magnetoresistive effects, Hall effects, etc., is significantly superior to the electromagnetic induction type in reproducing J+e3 Bl.By the way, in the magnetic tape storage Noki City, In order to increase the reliability of the written information, a so-called read-after-write check, which checks the read information in parallel with writing, is generally performed. A function that can monitor the playback sound in parallel may be required. Recording and Simultaneous V Playback 4 In the device of Ie Naukon et al., the VC arrangement near the playback head 1
-Isa fl.

Leakage from the recording head fL 4d bundle All the reproducing heads are aware of throat 9. The so-called crossfeed 1'iL sound occurs in between.

Figure 1 shows that using the conventional magnetoresistive effect i1:lt, R
FIG. 3 is a diagram showing all the main parts of a thin film reproducing head. 1. A rectangular Xa 9 j made of a magnetic thin film with a magnetoresistive effect.
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1. Disposed in such a way that one end fully contacts the left end when viewed from the side view and extends in the orthogonal direction.1. A strip-shaped thin film conductor for signal extraction, 3 is a strip-shaped thin film conductor for signal extraction disposed such that one end fully contacts the right end of the magnetoresistive element 1 in the longitudinal direction and extends in the orthogonal direction. It is. In such a thin film reproducing head, in order to reduce the electrical resistance of the left thin film conductor 2 and the right thin film conductor 3, the widthwise outer edge 2a of the left thin film conductor 2 is moved from the outer edge 3a of the right thin film conductor 3 in the width direction.
By making the width at 'j the same as the length in the longitudinal direction of the magnetoresistive element (2) or 7 fL or more, the left thin film conductor 2
And the width of the right side thin film conductor 3 can be made wider.

By the way, in such I14-zukuri, from the front to the back of the diagram (
Leakage r+- from the recording head passing (from the back to the front)
Of the magnetic flux, the leakage n, magnetic flux that enters the area (the area indicated by diagonal lines in (/1)) roughly between the line that bisects the width of the left thin film conductor 20 and the line that bisects the width of the right thin film conductor 3 is: Left thin film conductor 2, magnetoresistive element 1, and right thin film conductor 3
(j7) causes noise to be generated in a loose manner. That is, since the area is large, the leakage magnetic flux passing inside the loop has a large percentage, so that the cross-field noise generated by the loose loop due to electromagnetic induction is very large. There was a drawback that it was not practical.

In addition to the two thin film conductors 2 and 3 shown in FIG.
The same type of Wl-wA reproducing head provided with -1-1 had exactly the same drawbacks as 1jtl7□11. Furthermore, I re-1-minute I! l' (In order to increase the resistance, one side or both sides of the magnetoresistive element 1 is covered with a fully ferromagnetic thin film for magnetic shielding kM!1).
However, leakage magnetic flux from the recording head tends to concentrate on the shielding ferromagnetic thin film, causing cross-feed noise and noise to become more serious problems.

The present invention t; In order to eliminate the drawbacks of Niko et al., a rectangular magnetoresistive element made of a magnetic thin film is provided, and one end of the magnetoresistive element is in full contact with each longitudinal end of the magnetoresistive element and extends in an orthogonal direction. In a thin film reproducing head having a plurality of strip-shaped thin film conductors for signal extraction arranged in parallel, the width between the outer edges in the width direction of each of the thin film conductors is set to a predetermined width from the magnetoresistive element to the longitudinal direction of the thin film conductor. The length of the magnetoresistive element is smaller than the length of the magnetoresistive element in the longitudinal direction, and the length of the magnetoresistive element is smaller than the longitudinal length of the magnetoresistive element.

2 and 3 show an embodiment of the present invention,
The present invention is embodied as a thin film reproducing head without a magnetic field. In the figure, 10 is a substrate such as glass, 11 is ξ-
A rectangular magnetoresistive element made of a magnetic membrane having a magnetoresistive effect such as Malloy thin J conversion; 12 is the magnetoresistive element 1;
A conductor 13 is an n-fr band-shaped conductor for character extraction, one end of which is in contact with the left end 11a when viewed in the longitudinal direction of the magnetoresistive element 1, and is disposed so as to extend in the orthogonal direction. 1f on the right in the figure is a thin film conductor for signal extraction in the form of a strip, which is disposed so as to fully contact the WA section 11b at one end and extend in the orthogonal direction. Outer edge 1 in the width direction of the left thin film conductor 13:
3a is such that the width between the magnetoresistive element 11 and the thin film conductor 12.13 is smaller than the longitudinal length of the magnetoresistive element 11 at a predetermined length i''L, fv or more in the longitudinal direction of the thin film conductor 12.13. None, t'L between the line that bisects the width of the left thin film conductor 12 and the line that bisects the width of the right thin film conductor 13.
The area (the area indicated by diagonal lines in FIG. 2) is narrowed. 14 is a surface facing the recording medium A.

With the above configuration, vi! from an adjacent recording head (not shown) can be recorded. t fi - most of the magnetic flux is
Since the n-R magnetic gap on the outside of the loose n formed by the left thin film conductor 12, the magnetoresistive element 11° and the right thin film conductor 13 is enlarged compared to the conventional one, it passes through the entire n-R magnetic gap 11↓.
Cross-feed miscellaneous coupling can be reduced.

In addition to the two thin film combinations 12 and 13 shown in FIG. Similar effects can be obtained by adopting this configuration.

Further, even with the same type of thin film reproducing head in which the magnetoresistive element 110 is covered with a ferromagnetic thin film on one or both sides and subjected to magnetic shielding, the same effect can be obtained by employing all of the above-mentioned configurations.

Note that although the width of the thin film conductors 11.12 cannot be increased in the present invention, an increase in electrical resistance can be avoided by increasing the thickness of the thin film conductors 11.12.

As explained above, the present invention includes rectangular magnetoresistive elements made of a magnetic thin film, which are arranged side by side so as to have one end in contact with each longitudinal end of the magnetoresistive element and extend in an orthogonal direction. In a thin film reproducing head completely equipped with a plurality of band-shaped thin film conductors for signal extraction, the entire width between the outer edges in the width direction of each of the thin film conductors, and a distance of at least a predetermined length n− from the magnetoresistive element in the longitudinal direction of the thin film conductor. However, since the longitudinal length of the magnetoresistive element is small, most of the leakage magnetic flux from the nearby recording head is transmitted to the outside of the loop consisting of the magnetoresistive element and the thin film conductor at both ends. It passes through a magnetic gap that is wider than in the past, and cross-feed noise can be reduced. Therefore, even when used in a magnetic recording device that requires recording and reproduction at the same time, it has the advantage of being able to perform accurate and faithful reproduction.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIG. 1 is a front view showing the main parts of a thin film reproducing head that utilizes the magnetoresistive effect, and FIG. 2 is similar to FIG. 1, showing an embodiment of the present invention. , and FIG. 3 are also vertical li planes 111 and U. 10... Substrate, 11... Magnetoresistive element made of magnetic thin film, 12, 13... Thin film conductor for signal extraction Patent applicant
Japan Telegraph and Telephone Public Corporation Agent Patent Attorney Yoshi 1) Takashi Sei

Claims (1)

[Claims] A rectangular magnetoresistive element made of magnetic thin film 11@Yoshi, and a plurality of strip-shaped signal emitters arranged in parallel so as to extend in orthogonal directions with one end in contact with each longitudinal end of the magnetoresistive element. In the thin film reproducing head, the magnetoresistive element is located between the widthwise outer edges of each of the thin film conductors at a distance of at least a length from the magnetoresistive element in the longitudinal direction of the thin film conductor. is smaller than the longitudinal length of f
A thin film reproducing head with q′1′ characteristic.