JPS5856181B2 - magnetic bubble splitter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the major loop configuration of a two-layer conductor film current-driven magnetic bubble memory.

Double-layer conductor film current-driven magnetic bubble memory has the advantage of being capable of high-speed operation, but on the other hand, because information is read out by a detector directly connected to the major loop, it has the following disadvantages: .

In other words, even if you reread the information when a malfunction occurs due to bubble branching or the like in the detector section, the correct information will not be obtained because the information has been changed due to the malfunction mentioned above, and a major loop will occur. Since an extra transfer step is placed on top to expand the bubble, the loop length becomes large.

The present invention has been made in consideration of these points, and is intended to improve the above-mentioned disadvantages and make use of only the advantages.

Prior to explaining the embodiments of the present invention, the general structure and operation of conventional chips and major loops will be explained in Sections 1.2 and 3.4.
Add a simple explanation based on the diagram.

The conventional memory chip configuration is as shown in FIG. It is connected to major loop M, which is an information input/output area.

A bubble generator G for writing information and a detector G for reading information are installed on the major loop M.

The transfer paths constituting each loop are constructed by arranging a large number of basic blocks shown in a plan view and a sectional view in FIG. 2 along the propagation trajectory direction A.

In the basic block, a first layer conductive film 3 is provided on a substrate film 1 as a bubble carrier through an insulating spacer 2, and a second layer conductive film 5 is further provided on top of this through an insulating spacer 4, and the entire structure is formed into a chip. It is coated with a protective film 6.

There is a predetermined plane curvature relationship (
Usually, the length of the overlap in the direction of the propagation trajectory is approximately λ/4.

Here, λ is four times the bubble diameter.

) are provided with open patterns 3a and 5a, and these pairs of open patterns form one bit.

Two-phase alternating currents I, I' (trapezoidal wave is shown as an example, but sine wave, triangular wave, or other waves may also be used) shown in Figure 3A are applied to each conductor film with positive and negative position marks, respectively.

and P3, and P2 and P4 are applied in the second illustrated direction, and the same reference numerals are attached to the lower rim of the open Ropacoon hole! P1. P2゜P
3. P4. Bubble propagation is performed by forming bubble capture points at given timings.

In FIG. 2, a hexagonal open pattern is shown as an example, but an elliptical or rectangular pattern may also be used.

This also applies below. The detector consists of a permalloy thin film 7 and a conductor 8 for lead wires, shown in FIG.
Consists of a and sb.

The transfer path near the detector (that is, near the permalloy thin film 7) is also the same in principle as the one shown in Figure 2, but it is usually shown in a plan view in Figure 4 in order to obtain a large detection signal. It is composed of patterns 3b and 5b deformed as shown in FIG.

The bubble, which has propagated along the propagation trajectory direction A, moves along the trajectory indicated by the broken line in the figure, and the Lopakuun 3 between the detector parts
b, 5b, and when it becomes sufficiently long, it is detected by the permalloy thin film 7.

Thereafter, it is gradually reduced to its original shape by the intervening robot turns 3b' and 5b', and then returned to its original position on the minor loop via the first illustrated major loop M and transfer gate T.

In this case, the information (i.e., the presence or absence of bubbles) is converted into an electrical signal by the permalloy thin film 7, and then the conductors 8a, 8b
Output to the outside of the chip via.

As described above, the conventional measure loop has a detector directly connected thereon, which causes the above-mentioned disadvantages.

In contrast, the present invention provides a bubble splitter at a predetermined position on the major loop to duplicate the bubbles, returns one to the storage area, and guides the other to the detector via a dedicated transfer path, thereby effectively By separating the detector from the major loop, the above-mentioned difficulties are avoided.

. Hereinafter, the structure and operation of the present invention will be described in Figures 3A and 3B,
Explanation will be added based on FIG.

FIG. 5 shows a first embodiment of a bubble splitter according to the invention,
In the figure, PIJ (I L2+'3+..., j-1
, 2, 3, 4), the position below each open Ropakun hole line is a current ■.

This is a bubble trapping point formed corresponding to the phase Pj (j-1, 2, 3, 4) of I'.

The bubble that has propagated along the propagation trajectory direction A is a predetermined two-phase alternating current ■.

■Each phase of '(...P1→P2→P3→P4)
Accordingly, the bubbles are attracted to the bubble trapping points formed under the edge of each open Ropacoon hole...P11→P12→P13
......P24 and under the condition that no current is applied to the conductor 9, the next current phase sequence (P4→P1→
P24→P31 according to P2→P3→P4→)
→P3□→P33→..., it moves along the propagation trajectory direction A', and as a whole, the major loop length (
After a current period equal to the number of bits of the major loop has elapsed, it returns to its original position.

On the other hand, when the desired bubble reaches P24, that is, the 3rd B
If a current pulse ■□ is applied in the direction of expanding the bubble at the timing shown in the figure, the bubble will be placed under the rim of the open Ropacoon hole P24 r P31 on the major loop and below the rim of the open Ropacoon hole P3'1 on the detector dedicated transfer path. Even if the pulse is cut at the phase P1 corresponding to P31 (this is equivalent to P3'1) as shown in Figure 3B, both the left and right ends of the bubble will reach the bubble trapping point formed at P31 and P3□. It is attracted and bridges between P31 and P3'1.

Thereafter, the bubble is further elongated in the left and right direction in accordance with each phase of the transfer path drive current, but by applying a pulse of opposite polarity (■/ in the figure 3B) at phase P2 corresponding to P32. , it is cut into two parts near the center, and each part has a stable circular shape (having the same diameter as the original bubble).

That is, two bubbles are formed below the edge of the open Ropacoon hole P3□ and P3'2.

Among these, one is P32→P33→P34→・・・・・・
・ continues to propagate along the propagation trajectory direction A' on the major loop and is returned to the original storage area, and the other one is P3'2→P
3'3→P3'4→..., it propagates along the propagation trajectory direction A'' on the detector dedicated transfer path, is enlarged by the fourth opening lever patterns 3b and 5b, and is detected by the detector. is released outside the chip.

In this case, if a malfunction occurs in the detector, re-reading becomes possible by dividing the former again.

Above, I have only explained one bubble Q, but
It will be clear that continuous information reading is possible by subsequently applying positive and negative current pulses □ and □ to the conductor 9 in accordance with the sequence shown in Figure 3B.

The configuration and function of the bubble splitter are as described above, but the shape of the conductor 9, the position of the divider on the major loop, and the structure of the detector-dedicated transfer path only need to satisfy the above-mentioned functions. In view of the spirit of the invention, various modifications can be made.

For example, regarding the conductor 9, even if it is round as shown in Figure 6A,
It may be a rhombus as shown in B in the same figure, or a polygon convex upward in the drawing as shown in C in the same figure.

In addition, the conductor for the lead wire may be placed horizontally as shown in the same figure, or the conductor for expansion 9 and the conductor for cutting 9' may be stacked on top of each other with an insulating spacer interposed between them, as shown in figure E. Good too.

However, even in the case of E above, the shape of the loop portion may be as shown in B and C above, or may be square, or may be any other shape.

On the other hand, regarding the position and shape of the bubble splitter, it may be provided not at a corner part as shown in the fifth figure but in a straight part as shown in the seventh figure.

However, in this case, the dimensions of the open pattern on the detector-dedicated transfer path must be almost the same as those of these patterns so as not to extremely disturb the current distribution near each pattern on the parallel major loop.

Also, regarding the timing of applying current pulses, the pulse that expands the bubble may be the same as in the case shown in Figure 5 above, but the timing of applying the pulse of the opposite polarity is due to the structure of this bubble splitter. P33~P3'
It must be when there is a bridge between 3 and 3.

As described in detail above, according to the present invention, rereading is possible in the event of a detector malfunction, and the reliability of the memory chip can be greatly improved.

[Brief explanation of the drawing]

Figure 1 is an example of conventional chip stealing, Figure 2 is a plan view and cross-sectional view of the transfer path basic block, Figure 3 is an explanatory diagram showing the timing of applying current to each conductor, and Figure 4 is a bubble A plan view of the detector and the open ropacoon in its vicinity, FIG. 5 is an embodiment of the bubble splitter according to the present invention, FIG. 6 is an example of a modification of the conductor for controlling the bubble splitter, and FIG. 7 is the bubble splitter. This is an example of a modification. In the figure, 1 is a substrate film as a bubble carrier, 2 and 4 are insulating spacers, 3 and 5 are first and second layer conductor films, 6 is a chip protection film, 7 is a permalloy thin film detector, 8a and sb are detection The device lead conductors 9 and 9' are conductors for controlling the bubble splitter.

Claims (1)

[Claims] 1 A bubble splitter provided on the major loop of a two-layer conductor film current-driven magnetic bubble memory, which consists of two bubble dividers facing away from each other with a branch point provided on the transfer path constituting the major loop as a boundary. It consists of two transfer paths and a conductor having a shape that surrounds and extends over the hole edge of a predetermined open pattern on these two backward transfer paths, and in bubble propagation that does not involve information detection, the bubble is transferred to one side. If the bubble is moved only onto the road, and information detection is involved, by applying a current to the conductor in a direction that causes the bubble to expand.
This is bridged between predetermined open conductors on the two backward transfer paths, and then a current is applied to the conductor in the direction of extinguishing the bubble, causing the bubble to be cut from the center, thereby separating the two bubbles. A magnetic bubble splitter characterized by generating a bubble.