JPS5849946B2 - transfer in gate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer-in gate for introducing a magnetic bubble from a write transfer path into a minor loop, which is a storage section, in a magnetic bubble element.

The principle of magnetic bubbles was developed by Andrew H. Bobeck
The details were discovered by A. H. Bobec
k etal. ”Magnetic Bubble
es″SCientificAmerican, Vow
．． 2 2'4, June 1 9 7 1, p
It is described on pages 78-91.

Storage devices in which the presence or absence of a magnetic bubble corresponds to a single signal are widely used today, and as magnetic bubble technology advances, such devices are becoming larger and faster.

Such devices usually consist of a chip with a high permeability layer with a suitable pattern provided through an insulating layer on a plate of magnetic material through which the magnetic bubbles move, and a bias perpendicular to it. It consists of a magnet for applying a magnetic field and a coil for applying a rotating magnetic field that rotates in a plane parallel to the chip.

A magnetic bubble is created by a magnetic field created by an electric current flowing through a hairpin-shaped conductor, usually mounted on a chip, and is moved along the write transfer path as the rotating magnetic field rotates, passing through the transfer-in gate. It is stored in the minor loop, which is the memory section.

In some types of devices, there is an operation to move the bubble corresponding to the new information to be written from the transfer path to the minor loop, and to move the bubble corresponding to the old information that exists in the minor loop to the minor loop.・Operations for moving from the loop to the transfer path can be performed at the same time.

Such a gate is called a swap gate.

The bubble path corresponding to new information in the swap gate 35 functions as a transfer-in gate, and although the present invention was described above as relating to a transfer-in gate, it is equally applicable to a swap gate. be done.

Such a swap gate is described, for example, in US Pat. No. 4,007,453.

FIG. 1 shows a top view of one such swap gate.

In the figure, 2, 3, 4, 5 and 6 are the five permalloy elements at the right end of the minor loop 1.

As the rotating magnetic field rotates, the bubbles are transferred in the direction of arrow 7.

Bubbles are generated by a bubble generator, not shown, and are transferred along transfer path 8 in the direction of arrow 9.

When the bubble reaches the upper end of permalloy element 10, current flows through conductor loop 11 in the direction of arrow 12;
The bubble deviates from the transfer path 8 and is transferred through the permalloy element 13 into the minor loop 1.

In the transfer-in game 1, permalloy element 1 is used to send the bubble from minor loop 1 to transfer path 8.
The principle is the same as above, except that 4 and 15 are not present.

Traditionally, a permalloy element, typically an element of high magnetic permeability material (
4) in Figure 1 and the transfer-in gate minor
The minor loop ends of the loop end permalloy elements, generally elements of high magnetic permeability material (13 in FIG. 1), are arranged parallel to each other, with adjacent permalloy elements in close proximity.

Therefore, mutual interference is large, bubbles tend to disappear or go out of the transfer path in this part, and the upper limit of the allowable bias magnetic field is low.

It is therefore an object of the invention to provide a magnetic bubble device, in particular a transfer-in gate, with a large bias field margin.

In order to achieve the above object, the transfer gate according to the present invention has a branch of the element of high magnetic permeability material at the end of the minor loop on the transfer-in gate side facing the transfer-in gate and a transfer gate. The gist is that the branches facing the minor loop of the element of high magnetic permeability material at the minor loop side end of the in-gate are provided at an angle to each other.

Preferably, the angle of inclination is between 300 and 90 degrees.

Hereinafter, the present invention will be explained in detail with reference to Examples.

FIG. 2 shows a permalloy element 16 at the minor loop end of a transfer-in gate according to the invention, together with three permalloy elements 17, 18, 19 at the minor loop transfer-in gate end.

Bubbles generated by a bubble generator (not shown) are sent through a transfer path in the direction of arrow 20 and are transferred in the direction of arrow 21 through the minor loop.

That is, the permalloy elements 16, 17, 18,
19 are the permalloy elements 13, 5, 4, respectively in Fig. 1;
Corresponds to 3.

Comparing the pattern in Figure 2 with the pattern in Figure 1, we find that in Figure 1, the left and right (lower in Figure 1) patterns are formed symmetrically with respect to the center line, whereas in Figure 2, The left and right patterns have a staggered configuration in which they are shifted by half a period from each other, which is also known to increase the bias magnetic field margin.

FIG. 3 shows the actual axis of the branch facing the permalloy lance 16(7) minor loop in the pattern shown in FIG. The change in the transfer bias magnetic field margin expressed as a percentage is shown as a function of the angle α, where α is the angle formed by the axis.

The results shown in Figure 3 are based on the pattern period of 8 μm1 shown in Figure 2.
This was obtained at a rotating magnetic field strength of 550e and a frequency of 100 KHz.

As is clear from FIG. 3, the bias magnetic field margin initially increases as α increases, but when α exceeds 30°, it does not change much, and when α exceeds 900, it begins to decrease.

This means that α is less than 90°. This is believed to be because as the size increases, it becomes difficult to connect patterns.

The lower limit of the allowable bias magnetic field is almost independent of α.

The increase in margin shown in FIG. 3 is therefore obtained almost exclusively by raising the upper limit of the permissible bias field.

It is clear from FIG. 3 that it is advantageous to choose α between 30° and 90°.

It goes without saying that the shape of the permalloy element at the end of the transfer-in gate on the minor loop side is not limited to the shape shown at 16 in FIG.

When α is large, it has a shape as shown in FIG. 4, and when α is not so large, as shown in FIG. 5, the branch near the minor loop becomes the permalloy element 16 of FIG. Similarly, the branch further from the minor loop can take a shape similar to that shown in Figure 4.

As described above, according to the present invention, the transfer bias magnetic field margin can be made twice as large as that when using a conventional transfer-in gate.

[Brief explanation of drawings]

FIG. 1 shows a conventional transfer-in gate pattern, and FIG. 2 shows a transfer-in gate pattern according to the present invention.
Figure 3 shows the pattern of the gate, showing the transfer-in gate and the substantial axis of the branch facing the transfer-in gate of the element of high magnetic permeability material at the end of the minor loop on the transfer-in gate side. Figures 4 and 5 showing the relationship between the angle made by the substantial axis fJ of the branch facing the minor loop of the element of high magnetic permeability material at the minor loop side end of the gate and the transfer bias magnetic field margin; The figure shows another embodiment of the invention. 16... Permalloy element at the minor loop side end of the transfer-in gate, 17, 18, 19...
...Three permalloy elements on the transfer-in gate side of the minor loop, 20...Arrow indicating the direction of bubble transfer in the transfer-in gate, 21... - Arrow indicating the direction of bubble transfer in the minor loop.

Claims (1)

[Claims] 1. A branch of the element of high magnetic permeability material at the transfer-in gate side end of the minor loop facing the transfer-in gate and a minor loop of the transfer-in gate.
A transfer-in gate characterized in that the branches facing the minor loop of the element of high magnetic permeability material at the loop side end are provided at an angle to each other. 2. A transfer device according to claim 1, characterized in that the angle of said inclination is between 30' and 900'.
In Gate.