JPS6038790B2 - bubble element - Google Patents

Description

[Detailed description of the invention] TECHNICAL FIELD The present invention relates to bubble elements.

Conventionally, bubble devices have adopted a method in which soft magnetic patterns are provided on a bubble retaining layer with a gap between them and bubbles are transferred by in-plane magnetic field rotation.

However, the gaps in the pattern are undesirable because they reduce bubble density, impede high-speed bubble transfer, and limit pattern microfabrication. On the other hand, U.S. Pat. No. 3,828,329 proposed an element that transfers bubbles using a gapless pattern, and its development has been progressing rapidly recently.

There, the pattern is formed by ion implantation. Since the transfer pattern of that device was in the shape of a spiral circle, it is called a continuous disk (hereinafter referred to as CD) device, including devices with shapes developed after that. Currently, CD elements are becoming larger in capacity, higher in density, and more sophisticated.

In this case, the bubble transfer path is usually provided at a pattern period about four times the bubble diameter, and together with the bubble generator, the gate operating section, and the bubble detector, a bubble element is constructed. Such conventional bubble element configurations are described, for example, in the Bell System Technical Journal
Old elISys. Tech. J. ) 5th Ship Nobori (198th place), page 229: ``As stated above, it is desirable to be able to freely change the transfer path, such as bending the transfer path, with respect to the arrangement of each functional part.However, In a CD element, due to the principle of transfer, each element of the transfer path is continuous, and changing the transfer path, such as bending the transfer path, is related to the characteristics of the entire transfer path, so there is a drawback that the transfer path cannot always be changed freely.

Further, when a functional unit such as a bubble generator is normally provided in such a transfer path, the transfer margin is seen to be reduced due to its influence.

A specific example of the bending pattern of the transfer path is shown in FIG.
Flo Sheetings (beat PConf.Proc.) 1st
The structure described in Volume 0 (1972 King), page 339, and Figure 2 a
IEE Transactions on Magnetics (lEEETran) as shown in ~c.
s. N is gn. ) No. N light g-15 lid (197g king) 1st
There is only the configuration described on page 323. Bubble transfer at these corners has not been previously reported, but
As will be explained in the Examples section below, it has been revealed that errors in which a bubble skips over a bit and errors in which a bubble traps in a cusp portion occur. SUMMARY OF THE INVENTION An object of the present invention is to provide a bubble element that alleviates the drawbacks of the transfer path of a CD element and has a transfer pattern suitable for installing a functional section. According to the present invention, in a bubble transfer path of a CD element in which ions are implanted into a bubble retention layer and bubbles are transferred along a pattern in a non-ion implanted region, the first and second paths have a path pattern period approximately four times the bubble diameter. a transfer path, and a third transfer path connecting the first and second transfer paths, and the third transfer path connects the first transfer path to the first transfer path.
and a plurality of continuous patterns larger than the second transfer path pattern, and the first and second transfer paths are connected via the third transfer path portion. A bent bubble element is obtained.

Note that in the third transfer path, a single pattern larger than the first and second transfer path patterns may be used, but a more favorable baffle transfer margin can be obtained by using a plurality of patterns. Next, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a diagram showing a first embodiment of the present invention.

Reference numerals 31 and 32 are the first and second transfer path patterns, respectively, numeral 33 is the third transfer path pattern connecting the first and second transfer paths, and reference numeral 34 is the first and second transfer path pattern. It is the angle formed by The pattern 33 of this embodiment has a pattern period of approximately 1.0 times the period of the first and second transfer path patterns.
The corner pattern differs from the conventional corner pattern shown in FIG. 2a in that it is a sharp sound. In the conventional corner pattern as shown in FIG. 2a, for example, in the case of a convex corner (outer corner), an error occurs in which a bubble skips a bit. This is thought to be because the properties of the magnetic charge wall, which is the bubble driving force of the CD element, change at the corner. This error causes the pattern period of the plurality of transfer patterns 33 in the corner portion to be approximately 1.0 times the pattern period P of the transfer path patterns 31 and 32 as in this embodiment.
It was improved by multiplying it by 5 times. Also, the corners of the recess (
As for the inner corner (inner corner), the bubble trapping error in the conventional pattern was improved and good transfer was obtained. Furthermore, the pattern period of the corner pattern 33 is approximately twice that of the transfer path patterns 31 and 32.
Better transfer was obtained when the value was increased. pattern 33
Even when the frequency of the bubble-driven in-plane rotating magnetic field was 250 kHz, no problem was observed regarding the transfer speed of simple transfer, including when the pattern period was approximately uneven. In this example, when the angle 34 formed by the first and second transfer paths was set to about 600 degrees instead of 90 degrees, better transfer was obtained compared to the conventional pattern (FIG. 2b).

Also, when the angle 34 is about 120°, the conventional pattern (second
Transfer was better than in Figure c). FIG. 4 is a diagram showing a second embodiment of the present invention. The pattern period of the patterns 41 and 42 forming the corner portion is approximately twice the pattern period P of the first and second transfer paths. however,
The pattern shape at the center of the corner is circular, and the patterns 41 before and after the corner are ellipsoids in which the length of the minor axis is smaller than 2P.
Better transfer was obtained compared to the conventional pattern (FIG. 2a). In this example, when the angle 34 was set to about 60 degrees instead of 90 degrees, the transfer was improved compared to the conventional pattern (FIG. 2b).

Also, when the angle 34 is about 120 degrees, the conventional pattern (
Transfer was better than in Figure 2 c). FIG. 5 is a diagram showing a third embodiment of the present invention.

Patterns 51, 52 and 53 forming the corner part
The pattern periods of the first and second transfer path pattern periods P are sequentially changed to about 1.5 times, about 2 times, and about 2.5 times, respectively, of the first and second transfer path pattern periods P. In this case, the transfer was significantly improved compared to the conventional pattern (FIG. 2a). In this embodiment, the angle 34 is about 600 degrees or about 120 degrees instead of 90 degrees.
In each case, the transfer was improved compared to the conventional pattern (FIG. 2 b or c).

FIG. 6 is a diagram showing a fourth embodiment of the present invention.

The two patterns 61 forming the corner portions are circles with a diameter of . A case where the angle 34 is approximately 300 degrees is shown. Good transfer was obtained both around the outside and inside corners. Also,
When the angle 34 was oo, better transfer was obtained compared to the conventional pattern shown in FIG. FIG. 7 is a diagram showing a fifth embodiment of the present invention.

The pattern 71 has a pattern period of about 1. The elliptical pattern 72 is a circle with a pattern period of about 1. A case where the angle 34 is oo is shown. Better transfer was obtained compared to the conventional pattern shown in FIG. FIG. 8 is a diagram showing a sixth embodiment of the present invention.

The pattern 81 has a pattern period of approximately 1. In the circular pattern of the ball, the angle 34 is oo. The transfer was better than the conventional pattern shown in FIG. FIG. 9 is a diagram showing a seventh embodiment of the present invention.

The pattern 91 has a pattern period of about 1. The ellipse of the square, pattern 92, is a circle with a diameter of about 1.2 mm, and the angle 34 is 00. The transfer was good. FIG. 10 is a diagram showing an eighth embodiment of the present invention.

Patterns 101 and 102 each have a pattern period of approximately 1. It is a square and an ellipse of about 2.0P, and the angle 34 is o
It is o. Good transfer was obtained. FIG. 11 is a diagram showing a ninth embodiment of the present invention. Patterns 111 and 112 each have a pattern period of approximately 1. Tsubo and approx.
The solution ellipse and angle 34 is oo. in this way,
Even when the corner pattern was arranged asymmetrically with respect to the first transfer path and the second transfer path, better transfer was obtained compared to the symmetrical conventional pattern as shown in FIG. FIG. 12 is a diagram showing a tenth embodiment of the present invention.

The pattern 121 is an ellipse whose pattern period is approximately twice the pattern period P of the first and second transfer paths. Angle 34 is 18
It is 0o. The transfer margin of the third transfer path in this example was better than the first and second transfer path margins of the subordinate pattern period P when the pattern period P was about 4 bubbles. Therefore, the transfer path portion 33 is suitable as a location for placing functional units such as a generator and a detector. In the first to first anchor embodiments described above, even when an angular transfer pattern is used instead of a circular or elliptical transfer pattern, it is effective to change the pattern period of the corner portion as in this embodiment. .

Furthermore, using a different value for the angle 34 from this embodiment is also effective in improving transfer. As explained above, according to the present invention, it is possible to provide a CD element in which the transfer path can be bent more easily than in the past and there are fewer transfer errors, and the effect is that it is possible to achieve a larger capacity and higher functionality of the bubble element. There is.

Furthermore, a high-performance transfer path suitable for providing a functional section in the transfer path can be easily realized. BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 a to 2 c are diagrams showing conventional transfer path patterns, and FIGS. 3 to 12 are diagrams showing first to tenth embodiments of the present invention, respectively. .

In the figure, 31...first transfer path pattern, 32...
Second transfer path pattern, 33...Third rotation path pattern, 34...Angle formed by the first and second transfer paths, 41,
42, 51, 52, 53, 61, 71, 72, 81, 9
1,92,101,102,111,112,121...
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Claims (1)

[Claims] 1. A conduitous method in which ions are implanted into the valve holding layer and the valve is transferred along the pattern of the non-ion implanted region.
In the bubble transfer path of the disk bubble element, first and second transfer paths have a passage pattern period approximately four times the bulb diameter, and a third transfer path that connects the first and second transfer paths. 1. A bubble element having a structure in which the third transfer path is comprised of a plurality of continuous patterns larger than the patterns of the first and second transfer paths. 2. The bubble device according to claim 1, wherein the first transfer path and the second transfer path are bent through the third transfer path portion.