JPS59911B2 - Bubble magnetic domain dividing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bubble domain divider for dividing cylindrical magnetic domains, so-called bubble domains.

Bubble magnetic domains are generated when a bias magnetic field of an appropriate value is applied perpendicularly to the surface of a thin plate of garnet or orthoferrite having uniaxial magnetic anisotropy.

Bubble magnetic domain memories and the like that store information using these bubble magnetic domains are being rapidly put into practical use because they are capable of high-density storage and are nonvolatile. Devices using such bubble magnetic domains require various functions such as generation, transfer, division, expansion, detection, and erasure of bubble magnetic domains.

Among these functional units, the present invention particularly relates to a bubble magnetic domain divider provided when duplicating information.

FIG. 1 is a diagram for explaining a conventional bubble magnetic domain divider proposed by the present application.

For details, please refer to Japanese Patent Application No. 12241/1982 (Japanese Patent Application Laid-open No. 097342/1983).

In the figure, 11 is a chevron pattern formed by stacking five chevron patterns, 12 is a chevron pattern formed by laminating chevron patterns through a zigzag pattern 6, which will be described later, in the center, and 11 and 12 constitute an input propagation path. are doing.

21, 22 and 31, 33 are dividing propagation paths each composed of a two-stage chevron pattern that branches the elongated bubble magnetic domain propagated from the input propagation paths 11, 12 into two.

Reference numeral 4 denotes a main conductor loop arranged in a direction perpendicular or nearly perpendicular to the propagation direction of the bubble magnetic domain so as to surround the chevron pattern 21, and 5 a part of the main conductor loop 4 is detoured as shown in the figure.
A protruding loop 6 formed protrudingly between the two divided propagation paths connects the chevron pattern provided at the center of the chevron pattern 12 forming the input propagation path and the chevron pattern provided between the divided propagation paths, and the end thereof Partially divided propagation paths 2, 3
This is a bending pattern that extends between 0 and 0.

With such a configuration, the input bubble magnetic domain extended from the A direction is divided by a combination of the rotating magnetic field and the magnetic field caused by the current pulse supplied to the conductor main loop and the protruding loop, thereby creating two divided propagation paths. 2 divided along
Two bubble magnetic domains can be propagated in the B direction and the C direction, respectively.

A problem in dividing the bubble domain using such a chevron pattern is that when the bias magnetic field is relatively high, the bubble domain disappears during the bubble domain expansion operation. That is, as mentioned above, a bubble magnetic domain is generated by applying an appropriate external bias magnetic field perpendicularly to a magnetic thin plate such as orthofequite;
As the f-as magnetic field is increased, the bubble magnetic domain becomes smaller.

In general, a relatively high bias magnetic field is used for the reason that the smaller the diameter of the bubble magnetic domain is, the larger the memory capacity can be when applied to a memory, etc. For the reason that the PU or bubble magnetic domain can be used effectively.

For this reason, in a bubble magnetic domain dividing device as shown in the figure,
When a bubble magnetic domain propagates from the A direction in a state where it is elongated due to the magnetic absorption force of the magnetic poles of the stacked Siepron permalloy pieces in each stage of the stacked Sieplon pattern, when a high bias magnetic field is applied, the bubble magnetic domain becomes very thin and becomes very thin. It becomes unstable and, in the worst case, disappears. Therefore, stable dividing operation cannot be expected. As mentioned above, a device that utilizes a bubble magnetic domain requires various functional sections, but in particular, the bubble domain expanding and dividing section, which is the object of the present invention, determines the upper limit of the operating margin of the entire bubble device on the high bias magnetic field side. ing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to expand the margin characteristics of the bubble domain expansion/division function section, thereby improving the operating margin of the entire bubble utilization device. A further object of the present invention is to obtain a bubble domain dividing device with a small minimum driving magnetic field and therefore with low power consumption.

Furthermore, it is an object of the present invention to provide a bubble magnetic domain dividing device that has sufficient margin characteristics even when the gaps between patterns, that is, pattern gaps, are widened. The objective is to realize a dividing device.

An object of the present invention is to provide a group of magnetic material patterns in which an attractive magnetic field is generated on both sides of a repelling magnetic field in a direction perpendicular to the direction of travel of the bubble domain by a driving magnetic field applied in the in-plane direction of a magnetic bubble crystal. The magnetic material patterns constituting the magnetic material pattern group are characterized in that they are left and right asymmetrical with respect to a line drawn from approximately the center of each pattern in a direction perpendicular to the traveling direction of the bubble magnetic domain. This can be achieved by using a bubble magnetic domain dividing device.

The present invention will be explained in detail below using the drawings. FIG. 2 shows an embodiment of the bubble magnetic domain dividing device according to the present invention.

In the figure, 11, 112 are modified siebron patterns in which a plurality of left-right asymmetrical patterns are stacked around a line drawn from the approximate center of the siebron pattern in a direction perpendicular to the direction of bubble magnetic domain advancement. So, 111,11
2 constitutes an input propagation path. 121, 122 and 131, 132 are divided propagation paths each constructed from a modified chevron pattern, and 16 is a zigzag pattern.

Note that in this embodiment, no conductor pattern is used. That is, it shows a so-called aggressive dividing device in which no current is supplied during the dividing operation. Next, the dividing operation will be explained using FIG.

The elongated bubble magnetic domain input from the A direction is sequentially transferred along the propagation path by the rotating magnetic field j, and when the rotating magnetic field HR is applied diagonally above and to the right of the bubble crystal plane (paper surface), the bubble domain changes to a in the same figure. As shown, it is held approximately at the center of the modified chevron pattern.

These elongated bubble magnetic domains are further divided into two divided propagation paths 121 and 131 by the rotating magnetic field HR.
and is moved to the left along the zigzag pattern 16 in the center. As shown in the figure, when the rotating magnetic field HR is applied to the right side of the bubble crystal plane (plane of the paper), the elongated bubble magnetic domain is held at the right end of each pattern 122, 132, but at this time, the extended bubble domain is formed continuously in the center. Since a strong repulsive magnetic field acts on the leftmost end of the zigzag pattern 16, the elongated bubble magnetic domain is cut at the center by this repulsive magnetic field. Thereafter, each of the cut bubble magnetic domains is sent out in the B direction and the C direction along the two divided propagation paths, respectively. The above is an explanation of the division operation, but what should be noted here is that
Each pattern holding an elongated bubble magnetic domain is asymmetrical with respect to a line drawn in a direction perpendicular to the traveling direction of the bubble domain from approximately the center of the siebron pattern.

Furthermore, the area of the permalloy pattern on the rear side in the bubble magnetic domain propagation direction with respect to this axis is set to be larger. As a result, when the driving magnetic field HR is below the bubble crystal plane (plane of the paper), the elongated bubble magnetic domain under the pattern moves to the right end of the next deformed sheapron pattern, crossing the pattern gap between the deformed sheapron patterns. At this time, the bubble magnetic domain is strongly attracted by the strong magnetization of the large-area permalloy pattern on the right side of the deformed chiapron pattern, so it can stably jump over the gap between the patterns.

In other words, the driving force of the bubble magnetic domain increases dramatically. Therefore, the dividing device of the present invention can stably transfer and divide elongated bubble magnetic domains even under a considerably low driving magnetic field.

In addition, very stable dividing operation can be performed especially under a high bias magnetic field. FIGS. 4 and 5 show other embodiments of the modified apron pattern applied to the present invention.

As described above, the pattern used in the present invention can be modified in various ways. In particular, the pattern shown in Figure 5 is a rotating magnetic field HR.
Since there are more places where strong magnetic poles occur during one rotation than in the patterns shown in FIGS. 2 and 4, more stable propagation and splitting operations can be performed on the expanded bubble magnetic domain. As described above, according to the present invention, it is possible to realize a bubble magnetic domain dividing device with improved operating margin characteristics. In particular, being able to expand the operating margin characteristics of the bubble splitting device, which has poor operating margin characteristics compared to other functional parts, can significantly improve the operating margin of the entire bubble utilization device, and greatly contributes to the development of bubble utilization devices. be. In the above-mentioned embodiment, a so-called aggressive dividing device that does not use a conductor pattern was used, but the present invention is not limited to this, and of course can be applied to an active dividing device that also uses a conductive pattern. This produces similar effects.

[Brief explanation of the drawing]

FIG. 1 is a conventional bubble magnetic domain dividing device, FIG. 2 is an embodiment of a bubble magnetic domain dividing device according to the present invention, FIG. 3 is an explanatory diagram of the operation of the embodiment shown in FIG. 2, and FIGS. The figure shows other pattern examples applicable to the present invention. In the figure, 111, 112 are human power transmission paths, 121, 1
22 and 131, 132 are output propagation paths, respectively, and 16 is a zigzag pattern.

Claims (1)

[Claims] 1. A magnetic material pattern group is provided in which an attractive magnetic field is generated on both sides of a repelling magnetic field in a direction perpendicular to the bubble magnetic domain traveling direction by a driving magnetic field applied in the in-plane direction of the magnetic bubble crystal, 1. A bubble magnetic domain dividing device characterized in that the magnetic material patterns constituting the body pattern group are left and right asymmetrical with respect to a line drawn from approximately the center of each pattern in a direction perpendicular to the direction of travel of the bubble magnetic domain.