JPS6038789B2 - bubble element - Google Patents

Description

[Detailed description of the invention] The present invention relates to a valve element.

Conventionally, a method has been adopted for valve elements in which soft magnetic material patterns are provided on a valve holding layer at intervals and the valve is transferred by in-plane magnetic field rotation.

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

Therefore, 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, 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 section in the configuration of each functional section such as valve generation, storage, gate operation, and detection. For example, Bell System Technical Journal (
Skill 11S$. TechJ. ), No. 5 (King, 1980), p. 229, describes an example of a transfer loop configuration, and there is a strong need to bend the transfer path. 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. A specific example of the bending pattern of the transfer path is, for example, as shown in FIG.
The structure described on page 339 of Ikarigatari (1973),
IEE Transactions on Magnetics (lEEETr) as shown in Figures a-c.
ans. Magn. ) Volume 15 (1979)
There is only the configuration described on page 1323. Valve transfer at these corner portions has not been previously reported, but as will be explained in the Examples section below, it has been revealed that errors in which the valve jumps over the bit or traps in the cusp portion occur. There is. The object of the present invention is to
It is an object of the present invention to provide a valve element provided with a corner pattern that alleviates the difficulty of bending the transfer path of the element.

According to the present invention, in the CD element in which ions are implanted into the valve holding layer and the valve is transferred along the pattern of the non-ion implanted region, the first and a circular or elliptical pattern having a dimension larger than the pattern period of the second transfer path.
A valve element is obtained in which the second transfer path is provided as a corner pattern.

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.

The reference numeral 31 is the first transfer path pattern, the same numeral 32 is the second transfer path pattern, the same numeral 33 is the pattern connecting the first and second transfer paths, and the same numeral 34 is the first transfer path and the second transfer path pattern. is the angle formed by the transfer path. The corner pattern 33 shown in this embodiment differs from the conventional corner pattern shown in FIG. 2a in that it has a diameter approximately twice the pattern period of the first and second transfer paths. Conventional code as shown in Figure 2a
In the inner pattern, for example, in the case of the corner 4 of the convex portion (outer corner), an error in which the valve bit skips over can be seen.

This is thought to be because the properties of the charged wall, which is the valve driving force of the CD element, change at the corner. This error was improved by making the outer diameter of the corner pattern approximately twice the transfer path pattern period P as in this embodiment. The outer diameter of the corner pattern is approximately 1. Improvements were also seen in the case of plaques and in the cases of about 3 to 4 times as much. Furthermore, in the conventional corner pattern as shown in Figure 2, the transfer margin is reduced due to an error in which the valve is trapped in the cusp part of the corner (sometimes the bit in the corner part jumps out) at the corner of the concave part (inner corner). Ta. On the other hand, in the case of the pattern of this embodiment, since the corner portion has a wide webbing portion, a good transfer margin can be obtained. FIG. 4 is a diagram showing a second embodiment of the present invention.

The difference from the first embodiment is that the angle 34 formed by the first and second transfer paths is 12 degrees instead of 90 degrees. Figure 2c
Valve transfer has been improved compared to the conventional pattern shown in . In the second embodiment, when the angle 34 between the first and second transfer paths was set to 600 degrees instead of 1200 degrees, the effect of improving transfer was greater than in the conventional pattern as shown in FIG. 2B.

Similarly, when the angle 34 was other values such as about 450 or about 13y, the corner transfer was good. FIG. 5 is a diagram showing a third embodiment of the present invention.

Reference numeral 51 indicates the first and second transfer paths, an elliptical pattern having a dimension larger than the pattern period P. The pattern size is approximately 2.5 cm long and short wisteria length. Fertilizer and approx.
．． There is. The number 34 is approximately 90o. The improvement in transfer was remarkable compared to the conventional pattern (Fig. 2a).
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 with fewer transfer errors, and it is possible to achieve larger capacity and higher functionality of the valve element. effective.

[Brief explanation of the drawing]

FIGS. 1 and 2 a to 2 c show conventional bent transfer paths, and FIGS. 3, 4, and 5 show first, second, and third embodiments of the present invention, respectively. It is a diagram. In the figure, 31...first transfer path pattern, 32...
...Second transfer path pattern, 33, 51... Corner pattern, 34... Angle formed by the first and second transfer paths.
Spear 'Zai 2 Spear 3 Spear 4 Spear 4

Claims (1)

[Claims] 1 Contiguous 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 disk valve element, a circular or elliptical pattern having a dimension larger than the pattern period of the first and second transfer paths is formed at a bent corner portion connecting the first and second transfer paths. A valve element characterized in that it is provided as a second transfer path corner pattern.