JPS6259394B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the configuration of a magnetic bubble element in a continuous disk type suitable for a high-density magnetic bubble element.

FIG. 1 shows the principle of magnetic bubble transfer in the continuous disk system. On a magnetic film 7 formed on a non-magnetic substrate 6, which has uniaxial anisotropy and can hold magnetic bubbles 4,
A disk-shaped mask 5 made of photoresist, gold or aluminum-copper alloy is formed, and hydrogen ions, helium ions, etc. are implanted into the exposed portions to form the ion-implanted film 1. Then, the magnetization of the film 1 will be oriented in the in-plane direction of the film. The direction of the magnetization 2 parallel to the inner surface of the film 1 is changed by a rotating magnetic field 3 applied parallel to the surface of the film 1. Accordingly, magnetic bubble 4
will be transferred along the edge of the disk 5. In this way, in the continuous disk system, since consecutive disks 5 are used for transferring the magnetic bubbles 4, there is no gap unlike the transfer pattern in the conventional memory system. Therefore, the transfer pattern is easy to create and high density can be achieved.

Such a continuous disk system requires bubble transfer between the major line or major loop 8 and the minor loop 9, as shown in FIG. This transfer is performed by passing current through a conductor provided between the major line or the major loop 8 and the minor loop 9. By the way, due to the crystal anisotropy of the magnetic film 7, this transfer characteristic depends on the angle θ between the major line or major loop 8 and the minor loop 9. For this purpose, a configuration is known in which the entire minor loop 9 is arranged at an angle of θ = 60 degrees with respect to the major line or major loop 8 (for example, see literature, YSLin et al. IEEE
TRANSACTION ON MAGNETICS.MAG−15
(1979) 1642). FIG. 3 shows a membrane structure in which the major loop 8 and the minor loop 9 shown in FIG. 2 are abbreviated with straight lines to show the major loop 8 and the minor loop 9. However, as is clear from FIG. 3, this configuration has the disadvantage that the ineffective area 10 increases on the chip, making it difficult to achieve high density.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic bubble element capable of achieving high density by eliminating the above-mentioned drawbacks of the major loop/minor loop configuration or the major line/minor loop configuration in the continuous disk system.

In order to achieve the above object, in the present invention,
The magnetic bubble element is characterized in that the minor loop is arranged perpendicularly to the major line or the major loop, and the minor loop is arranged so that only the portion adjacent to the major line or the major loop is inclined with respect to the major line or major loop. It is said that

The feature of the present invention is that, due to the configuration, it is possible to almost eliminate the ineffective area of the conventional configuration, and as a result, high density is achieved.

In other words, in the present invention, only the part where the transfer characteristic is most required, that is, the part of the major line or the minor loop closest to the major loop, is tilted according to the crystal anisotropy of the magnetic film, and the remaining part where the transfer characteristic is not so required. By arranging them perpendicularly to the major line or major loop, the ineffective area is minimized and the packaging density per chip is improved.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 4 shows a partial configuration of a major line/minor loop configuration or a major loop/minor loop configuration of a magnetic bubble element according to the present invention. In the figure, 11 is a major loop, and 12 is a minor loop. and,
Minor loop 12 consists of parts 13 and 14.
It consists of two parts. That is, the portion 1 of the minor loop 12 close to the major loop 11
The configuration is such that one bit of 3 has an angle of θ=60 degrees, and the other portion 14 of the minor loop 12 is at right angles to the major loop 11 (θ=90 degrees). FIG. 5 shows a major/minor loop configuration in which the major loop 11 and minor loop 12 of FIG. 4 are abbreviated with straight lines. As is clear from the figure, the ineffective area is smaller compared to the conventional configuration shown in Figure 3, and therefore approximately 30%
This shows that high density can be achieved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view to explain the principle of magnetic bubble transfer in the contiguous disk system, and Figure 2 is a major/minor loop configuration diagram in the conventional contiguous disk system.
FIG. 3 is an overall configuration diagram abbreviated the major/minor loop shown in FIG. 2, FIG. 4 is a configuration diagram of the major/minor loop in the continuous disk system according to the present invention, and FIG.
FIG. 2 is an overall configuration diagram in which the major/minor loop shown in the figure is abbreviated. DESCRIPTION OF SYMBOLS 1... Ion implantation film, 2... Magnetization, 3... Rotating magnetic field, 4... Magnetic bubble, 5... Disk, 6... Non-magnetic substrate, 7... Magnetic film, 8, 11... Major line or major loop, 9, 12... Minor loop.

Claims (1)

[Claims] 1. In the major loop/minor loop configuration or the major line/minor loop configuration in the continuous disc system, the minor loop is arranged perpendicular to the major line or major loop, and only the portion where the minor loop is close to the major line or major loop is A magnetic bubble element characterized in that it is arranged at an angle with respect to a major line or a major loop.