JPS6212592B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cascading disk bubble eraser, particularly a magnetic bubble device having a cascading disk pattern transfer path, in which a gap is created between the end disk pattern of the cascading disk pattern transfer path. A series of bead-shaped disks are provided with erasing disk patterns separated from each other, and bubbles that are no longer needed are transferred to the erasing disk pattern, and the bubbles that are no longer needed are erased by the interaction of the bubbles.
This relates to a bubble eliminator.

Bubbles that have already transmitted information in a cascading disk bubble device must be erased by appropriate means. Conventional bubble erasers, for example, use hairpin-shaped conductor patterns in the cascading disk pattern transfer path. A method is used in which a loop is created and a current pulse is passed through the conductor loop to locally apply a bias higher than the extinction magnetic field to collapse the unnecessary bubbles. In this method, it is necessary to apply a pulsed current for erasing bubbles, and for this purpose, a conductor loop with a hairpin-shaped conductor pattern must be created, and the power and power required to apply the pulsed erasing current must be Its peripheral circuitry also has the disadvantage of being necessary.

SUMMARY OF THE INVENTION The present invention aims to solve the above-mentioned drawbacks, and uses ion implantation into a magnetic thin film bubble crystal, such as an orthoferrite or garnet film, in a bead-shaped disk bubble device having a transfer path of a bead-shaped disk pattern. By using a structure in which disk patterns are provided at intervals at the ends of the bubble transfer paths that form the super track and the butt track, the purpose is to make it possible to erase bubbles that have completed information transmission using the above-mentioned simple method. . And for that reason, the cascading bead-shaped disc of the present invention
The bubble eraser is used in a beaded disk bubble device having a transfer path of a beaded disk pattern formed by ion implantation into a magnetic thin film bubble crystal to form a super track and a butt track. Erasing disk patterns are created at intervals in the disk pattern, and unnecessary bubbles transferred from the cascading disk pattern transfer path are transferred to the erasing disk patterns formed at intervals. At the same time, the unnecessary bubbles are erased by bubble interaction within the erasing disk pattern. This will be explained below with reference to the drawings.

Fig. 1 is an explanatory diagram illustrating the relationship between the crystal direction of a magnetic thin film bubble crystal and a transfer path, Fig. 2 is a principle diagram illustrating the basic operating principle of the present invention, and Fig. 3 is a bubble eraser according to the present invention. One embodiment, FIGS. 4A and 4B are operation principle diagrams explaining the operation principle of the bubble eliminator,
5 and 6 show other embodiments of the bubble eliminator according to the present invention.

In FIG. 1, numeral 1 represents a beaded disc pattern. It is generally known that when a magnetic thin film, such as a garnet film, is covered with a resist or an Au vapor-deposited film to form a disc-shaped pattern with ions implanted, bubbles are attracted to the periphery of the disc-shaped pattern. There is. As shown in FIG. 1, when a rotating magnetic field is applied to the adjacent beaded disk patterns 1 of the disks, the bubbles move along the periphery of the beaded disk patterns 1. Such magnetic thin films have easy magnetization axes in three directions (), (), and ().
The above-mentioned bead-shaped disk
The super pattern depends on which direction the disk patterns forming pattern 1 are lined up in a row.
Truck S, Bad Truck B, Good Truck
There are three paths for bubble movement: track g.

Here, super track S is a transfer path where the K ₁ direction of the magnetic thin film bubble crystal and the traveling direction of the transfer path have the relationship shown in Figure 1, and it is generally said that the bias margin of the transfer path is large. This is a passage that bubbles can easily pass through. Bud track b is a transfer path that has the smallest bias margin according to the relationship shown in FIG. 1, and is a path through which bubbles are difficult to pass. The good track g is located between the super track S and the bad track b, and is also an intermediate path for bubbles.

FIG. 2 is a principle explaining the basic operating principle of the present invention, 2-1 to 2-8 are disk patterns,
3 is a transfer path pattern, and the transfer path pattern 3 has four disk patterns 2-1 and 2-
4 adjacent disk patterns and 4 disk patterns
Adjacent disk patterns of patterns 2-5 to 2-8 form a bead-shaped disk pattern arranged in a row with a gap between them. The relationship between these disk patterns 2-1 to 2-8 and the magnetic thin film is such that the lower bubble path of the disk patterns 2-1 to 2-8 is the super track S, and the upper bubble path is the super track S. is constructed so that it becomes a butt track b. 4 is a bubble that exists in the super track S of the transfer path pattern 3 before the in-plane rotating magnetic field (hereinafter simply referred to as the rotating magnetic field) is applied, but as the rotating magnetic field is applied, it is transferred as shown in 4'. The bubble 5 is a bubble that exists in the butt track b of the transfer path pattern 3 before the application of the rotating magnetic field, but as the rotating magnetic field is applied, the bubble is transferred to the super track S as shown in 5'. represent. In addition, in the same figure
K ₁ represents the easy axis direction of magnetization for the disk pattern of a magnetic thin film bubble crystal, such as a garnet film.

As shown in FIG. 2, when the bubble 4 exists in the lower passage of the disk pattern 2-1 of the transfer path pattern 3, that is, the super track S, when a rotating magnetic field is applied in the counterclockwise direction, the bubble 4 Each time the rotating magnetic field rotates, one bit is transferred to the adjacent disk.
Bubble 4 is transmitted continuously as patterns 2-2 and 2-3, and by repeating this, bubble 4 is transferred to disk pattern 2-3. The bubble 4 transferred to the disk pattern 2-4 moves along the periphery of the disk pattern 2-4 with the rotating magnetic field of the next cycle, but the bubble 4 rotates once and moves around the disk pattern 2-4. It does not rotate to the upper path, but is transferred across the gap to the next disk pattern 2-5 by the application of the next rotating magnetic field.
In this way, even if there is a gap between the disk patterns, the bubble on the super track S will cross the gap and be transferred onto the super track S if the width of that gap is within a predetermined gap. I have a tendency to go. Then, as the rotating magnetic field is applied, the bubble 4 moves and is transferred to the bubble 4'.

On the other hand, the bubble 5 existing in the upper path of the disk pattern 2-6, that is, the butt track b.
When a rotating magnetic field is applied in a counterclockwise direction, the bubbles 5 are successively conveyed to the adjacent disk patterns 2-5. Then, when the next cycle of rotating magnetic field is applied, the bubble 5 cannot cross the gap,
Disk pattern 2-5 as shown by the chain line in Figure 2
Super Truck S rotates along the periphery of
will be introduced in Then, as the rotating magnetic field is applied, the bubble 5 is transferred on the super track S and moves to the bubble 5'. In this way, when there is a predetermined gap between the disk patterns in the transfer path pattern 3, the bubble 4 on the super track S
is transferred across the gap, whereas
The bubble 5 on track b cannot cross the gap and has the property of moving along the periphery of the disk pattern (Nelson et al. “Functional
TestCircuits Employing Ion―Implanted
PropagationPatterns”Paper #5B-2, Joint
Intermag MMMConference, statler―Hilton
(New York July 17-20, 1979) Figure 3 shows an embodiment of the bubble eraser according to the present invention, in which 6 is a function such as a detector or swap gate, 7 is a transfer path pattern, and 8 is a termination disk pattern. , 9 represents an erasing disk pattern, and 10 represents a bubble.
FIG. 4 is an operating principle diagram for explaining the operating principle of the bubble eliminator, and numerals 7 to 10 correspond to those in FIG. 3.

As shown in FIG. 3, an erasing disk pattern 9 is formed at the end disk pattern 8 of the transfer path pattern 7 with a gap therebetween to form a bubble eraser. The gap between the termination disk pattern 8 and the erasing disk pattern 9 is such that the bubble 10 on the super track S is transferred to the erasing disk pattern 9 by application of a rotating magnetic field, and the erasing disk pattern 9 is Bubble 1 transferred to pattern 9
A gap is created around which 0' can rotate along its periphery by application of a rotating magnetic field. After detection or after swapping the information in the minor loop of the bubble memory to the major loop, bubbles of information that are no longer needed are transferred from function 6 such as a detector or swap gate to transfer path pattern 7.
is transferred along the transfer path A by applying a counterclockwise rotating magnetic field. Then, the unnecessary bubble 10 heads toward the erase disk pattern 9. It is now assumed that there are no bubbles around the erase disk pattern 9. In this case, since the transfer path pattern 7 is created so that the transfer path A in FIGS. 3 and 4 becomes the super track S, the leading bubble 10 that is no longer needed from the function 6 is as explained above. Terminal disk
It crosses the gap formed between the pattern 8 and the erasing disk pattern 9 and is transferred to the erasing disk pattern 9 as shown in FIG. 4A. Bubble 1 transferred to erase disk pattern 9
0' rotates along its periphery as a rotating magnetic field is applied, and is eventually introduced into the butt track b. If a gap exists in the butt track b, the bubble 10' passes through the gap and is reintroduced into the super track S as described above. Therefore, the bubbles 10' continuously conveyed to the erasing disk pattern 9 continue to rotate along the periphery of the erasing disk pattern 9 as a rotating magnetic field is applied as shown in FIG. 4B.

Bubble 1 is no longer needed after Faction 6
0 is ejected and the bubbles 10 are continuously conveyed to the erasing disk pattern 9 across the gap along the transfer path A of the transfer path pattern 7, and the bubbles 10 are already along the periphery of the erasing disk pattern 9. Rotating bubble 10' and newly transferred bubble 1
Due to the interaction between the two bubbles, one of the bubbles will merge and disappear. The bubble that disappears is not uniform, and due to their interaction, one bubble remains in the erasing disk pattern 9, and the remaining bubble is surrounded by the erasing disk pattern 9. Continue rotating along. In this way, the unnecessary bubbles from the function 6 are transferred to the erasing disk pattern 9, and are erased by the erasing disk pattern 9 without being transferred to the butt track b of the transfer path pattern 7.

As can be seen from FIG. 3, in the case of the present invention, there is no need to provide a conductor loop of a conductor pattern in order to eliminate the bubble 10, and therefore a current pulse is passed through the conductor loop to locally eliminate the bubble. No electric power is required to create a magnetic field region that collapses 10.

5 and 6 show other embodiments of the bubble eliminator according to the present invention, and numerals 6 to 9 correspond to those in FIG. 3. 11 is a guard rail, 12 and 13 are gaps, 14 is a transfer path pattern,
15 and 16 represent disk patterns.

In FIG. 5, a transfer path pattern 11* is formed on at least one of the four sides of the guard rail 11, with the outer side being a super track S and the inner side being a Bud track ^B.
A gap 12 is provided at one location of the guard rail 11, and an erasing disk pattern 9 is provided at the end disk pattern 8 of the transfer path pattern 7 branched from the guard rail 11 with a gap therebetween. This shows a bubble eraser that eliminates bubbles accumulated on the guard rail 11. The one in Fig. 3 is for erasing the bubble information string that is no longer necessary after detection or swapping, whereas the one in Fig. 5 is used for erasing the bubbles accumulated on the guard rail 11. .

Assuming that there is an unnecessary bubble on the outside of the guard rail 11, there is a gap 12 only where the outside of the guard rail is a super track, so it is possible to cross this gap, so move counterclockwise. By applying the rotating magnetic field, the unnecessary bubbles are transferred to the terminal disk pattern 8 of the transfer path pattern 7, and further transferred to the erasing disk pattern 9, so that the bubbles disappear as described above. Furthermore, if an unnecessary bubble exists inside the guard rail 11, the bubble is transferred on the inside track, and eventually rotates in a disk pattern with a gap 12 with the inside as the butt track b, and then moves to the outside of the super bubble. - Since the bubbles are introduced into the track S and then transferred on the outer track, these bubbles also disappear as explained above. Consequently, unnecessary bubbles accumulated on the guard rail 11 can be wiped out.

In FIG. 6, there is a gap 12 at one location of a transfer path pattern 11'' formed such that at least the outer side of the four sides of the guard rail 11 is a super track S and the inner side is a pad track B.
is being made. A transfer path pattern 14 and a guard rail 11 extending from the function 6
The erasing disk pattern 9 is arranged in a direction that intersects with the disk pattern 16 at a predetermined angle θ=120° with a gap 13 in between. It's profitable. The bubble eraser configured in this way removes unnecessary bubbles from the guard rail 1 after the detection of the function 6 or after the swap.
1 and is used when trying to erase the bubbles all at once.

The unnecessary bubbles discharged from the function 6 cross the gap 13 on the super track S side between the transfer path pattern 14 and the disk pattern 16 and are introduced into the track connected to the disk pattern 15. Also, unnecessary bubbles on pad track b on the left side of disk pattern 16 pass through the pad track b side of gap 13 to the guard.
It is transferred to the track inside the rail 11. Padded track b inside the guard rail 11 above
The explanation of the transfer of unnecessary bubbles existing in the transfer path pattern 7 is exactly the same as that explained in FIG. , unnecessary bubbles discharged from the function 6 are allowed to flow to the guard rail 11 via the guard rail 11, and these bubbles can be eliminated all at once.

As explained above, according to the present invention, by using a simple structure in which an erasing disk pattern is provided at the end disk pattern of a cascading disk pattern transfer path with a gap, bubbles on a super track can be eliminated. is transferred regardless of the gap, but bubbles on the butt track pass through the gap and move to the super track, and the interaction between bubbles in independent disk patterns is used to eliminate unnecessary bubbles. I can do it. Further, when erasing unnecessary bubbles, it is possible to erase them without using unnecessary power for collapsing the bubbles. Since there is no need to erase using electric power, there is no need for a conductor loop of a conductor pattern for passing current pulses and its peripheral circuitry.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram illustrating the relationship between the crystal direction of a magnetic thin film bubble crystal and a transfer path, Fig. 2 is a principle diagram illustrating the basic operating principle of the present invention, and Fig. 3 is a diagram illustrating the bubble eraser according to the present invention. One embodiment, FIGS. 4A and 4B are operation principle diagrams explaining the operating principle of the bubble eliminator, and FIGS. 5 and 6 show other examples of implementation of the bubble eliminator according to the present invention. In the figure, 1 is a beaded disc pattern, 4,
5 and 10 represent bubbles, 8 represents a termination disk pattern, and 9 represents an erasing disk pattern, respectively.

Claims (1)

[Claims] 1. In a bead-shaped disk bubble device having a transfer path of a bead-shaped disk pattern in which a super track and a butt track are formed by ion implantation into a magnetic thin film bubble crystal, the terminal disk of the said bead-shaped disk pattern transfer path Erasing disk patterns are formed at intervals in the pattern, and unnecessary bubbles transferred from the chain-shaped disk pattern transfer path are transferred to the erasing disk patterns formed at intervals. A cascading disk bubble eraser characterized in that the unnecessary bubbles are erased by the interaction of bubbles within the erasing disk pattern.