JPS6292217A - Thin film magnetic head - Google Patents

Abstract

PURPOSE:To prevent the reduction in the reproduced output by giving an azimuth angle to one end of a gap with respect to the other end in arranging a magnetic pole for recording/reproduction where the gap is provided in a direction orthogonal in the running direction of a magnetic recording medium. CONSTITUTION:A recording field 11a where plural magnetization inverting parts 12 are formed at a right angle to a track center line 13 and adjacent racks 11b of the similar constitution constitute a magnetic recording medium 11. Then a magnetic pole 10 comprising magnetic poles 10a, 10b orthogonal in the running direction P of the medium 11 and having a gap G4 opposite to the field 11a is arranged, an azimuth angle theta1 is formed to the end of the adjacent track 11b with respect to the magnetic poles 10a, 10b is formed so as to make the end close to the track 11a. Thus, the side crosstalk, from the adjacent track is less, the reduction in the reproduction output and generation of peak shift when the off-track takes place are decreased.

Description

[Detailed Description of the Invention] [Summary] The present invention has a structure in which most of the gap is in a direction substantially perpendicular to the running direction of the magnetic recording medium, and only one end of the gap has an azimuth angle with respect to the other part. By doing so, we achieved a reduction in crosstalk with respect to adjacent tracks using azimuth loss, and since the portion with an azimuth angle is small, the drop in playback output is minimized when off-track. It is something.

[Industrial application field]

The present invention relates to a thin film magnetic head used for horizontal magnetic recording.

[Conventional technology]

FIG. 3 shows an example of the shape of the magnetic pole tip of a general thin-film magnetic head and the recording bits recorded on the corresponding magnetic recording medium. In the figure, reference numeral 1 denotes a thin film magnetic pole at the tip of a thin film magnetic head, which is composed of a pair of magnetic poles 1a and 1b. That is, a plan view of the side facing the recording surface of the magnetic recording medium 2 is shown.

G indicates the gap between the magnetic poles 1a and ib, 2a indicates the recording area of the track of the magnetic recording medium 2, and 3 indicates the shape of the recording bit (magnetization reversal portion) recorded on the trunk 2a. ing. 2b indicates a track adjacent to track 2a.

In this example, if a guard hunt is not provided between the recording tracks 2a and 2b, the recording signal of the adjacent track 2b will be read at the end of the thin film magnetic pole 1 (side cross 1), causing noise. .

FIG. 4 shows a conventional thin film head structure modified to prevent such side crosstalk.

In the figure, reference numeral 3 denotes a thin film magnetic pole at the tip of the a-film magnetic head, which is composed of a pair of magnetic poles 3a and 3b, and the shape shown in the figure is similar to that of FIG. A plan view of the facing sides is shown.

G2 is the gear knob between the magnetic poles 3a and 3b, 4a is the recording area of the track of the magnetic recording medium t, and 5 is the recording bit (magnetization reversal part) recorded on the 1-rack 4a.
It shows the shape of. 4b indicates a track adjacent to track 4a.

In this example, as shown in the figure, by bending the center portion of the magnetic pole 3 to form an angle θ with respect to the direction perpendicular to the running direction arrow P of the magnetic recording medium 4, the marks 1. An azimuth angle (azimuth angle) 2θ is provided between the rotation angle 5 and the recording hit 6, and the side cross I/- is reduced by utilizing the azimuth loss.

FIG. 5 shows a second conventional modified thin-film head, in which a thin-film magnetic pole is constructed of a magnetic pole 7a and a magnetic pole 7b with an azimuth angle provided at both ends of the gear, G:l, in contrast to the example shown in FIG. It has a structure of 7. 8 shows a magnetic recording medium recorded using the thin film magnetic pole 7.

[Problems to be Solved by the Invention] The drawbacks of the conventional modified thin film head will be explained with reference to FIG. This figure shows the relative position with respect to the recording pins I-5 and recording pitch l-6 when the thin film magnetic pole 3 in FIG. 4 is off-track to the right, where k is the off-track amount and 9
indicates the center line of the track 4a.

In both the heads shown in Figures 4 and 5, the azimuth portion occupies most of the gap, so as shown in Figure 6, off-tracking may occur due to positioning errors in the positioning mechanism of the thin-film magnetic head or thermal off-track. , Rlk occurs, the magnetization reversal portion 5 on the track shifts back and forth (up and down in the figure) with respect to the gap G2 in the left and right azimuth portions of the center line 9, resulting in a decrease in the reproduction output and a peak shift. The disadvantage is that the occurrence of such problems is unavoidable.

The present invention was created in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide a thin-film magnetic head that reduces the reduction in reproduction output and the occurrence of peak shift when off-track.

[Failure to solve the problem]

As shown in FIG. 1, the thin film magnetic head of the present invention is a thin film magnetic head having a gap G4 between magnetic poles 10 for recording/reproducing in a direction perpendicular to the traveling direction P of a magnetic recording medium 11. The end portion of the gap has an azimuth angle θ1 with respect to the other portion of the gap.

[Effect]

Most of the magnetization reversal portion is formed in a direction perpendicular to the running direction P of the magnetic recording medium 11, and a magnetization reversal portion having an azimuth angle θ1 is formed at one end of the recording bit 12. On the other hand, it is possible to prevent a decrease in reproduction output and to reduce the occurrence of peak shifts since the azimuth portion is small.

Further, side stroke can be prevented by setting the width of the azimuth portion within the limit of the amount of off-track generation.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Note that, in order to make the explanation of the configuration and operation easier to understand, the same parts are given the same reference numerals throughout all the figures, and repeated explanation thereof will be omitted.

FIG. 1 is a diagram showing an example of recording bits corresponding to the shape of the magnetic pole tip according to the embodiment of the present invention. In the figure, reference numeral 10 denotes a thin film magnetic pole at the tip of the thin film magnetic field 7, which is composed of a pair of magnetic poles 10a and 10b. ), ie, a plan view of the side facing the recording surface of the magnetic recording medium 11.

G4 indicates a gap between the magnetic poles 10a and 10b, and most of the gap G4 is in a direction perpendicular to the running direction of the magnetic recording medium 11 (direction of arrow P) as shown in the figure, and one end of the gap G4 The structure is such that only the portion has an azimuth angle θ1 with respect to the other portions.

Reference numeral 11a indicates a recording area of a track of the magnetic recording medium 11, 12 indicates the shape of a recording bit (magnetization reversal portion) recorded in the trunk lla, and 13 indicates the center line of the track 11a. llb indicates a track adjacent to track lla.

In addition, in this structure, a thin film magnetic pole and a gap layer can be easily formed by sputtering or vapor deposition on an inorganic material layer provided with a tapered portion of a desired angle, but the azimuth angle θl is small (preferably 45 degrees or more in both cases). It is desirable that the width W of the azimuth portion is at least approximately the maximum off-trunk width.

FIG. 2 is an explanatory diagram of the case where the thin film magnetic head of the present invention goes off-track.
In the case of lk, the thin film magnetic pole 10 protruding into the adjacent track Ilb has an azimuth angle θl of 45 degrees or more, so there is little side crosstalk, and most of the gap G4 does not deviate from the recording bit 12 (magnetization reversal area), so reproduction is not possible. There is little decrease in output.

It goes without saying that the left and right sides of the azimuth portion installation position or the positive or negative of the azimuth angle are arbitrary.

[Effects of the present invention]

As described above in detail, according to the thin film magnetic head of the present invention, since the recording bit end of the 1-rack adjacent to the gap end always has an azimuth angle, side crosstalk from adjacent tracks is small and It is possible to obtain a gJ thin film magnetic head with less reduction in reproduction output and less occurrence of peak shift when off-track occurs.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the shape of the magnetic pole tip of the thin film 7D according to an embodiment of the present invention and its recorded bits, Fig. 2 is an explanatory diagram when the thin film head of the present invention goes off-track, and Fig. 3 is a conventional diagram. Figures 4 and 5 are diagrams showing the shape of the magnetic pole tip of a conventional A-film magnetic head and its recording focus. The figure shows a diagram for explaining the drawbacks of the modified thin film head. In the figure, 10 indicates a magnetic pole, 11 indicates a magnetic recording medium, P indicates a running direction of the magnetic recording medium, G4 indicates a gap, and G1 indicates an azimuth angle. @ 1 Zusaijijin 4n-FlSr Sai Futofu-/7 br=@9
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Claims (1)

[Claims] A thin film magnetic head having a gap (G_4) of a recording/reproducing magnetic pole (10) in a direction perpendicular to the running direction (P) of a magnetic recording medium (11), comprising: One end is connected to the gap (
G_4) A thin film magnetic head having an azimuth angle θ_1 with respect to other portions of the head.