JPS6145312B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bubble memory element that prevents the generation of unnecessary bubbles in a magnetic bubble generation section.

There are two types of magnetic bubble generation methods for conventional bubble memory devices: disk type and nucleation type. However, it is not used much at present due to problems such as the generation of seed bubbles. The latter is a method in which magnetic bubbles are directly generated by a hairpin conductor, and has advantages such as being suitable for high speed and easy control, and is most commonly used at present. However, in this method, a pulse current of 100 to 300 [mA] is applied to the hairpin conductor, which locally increases the crystal temperature in the vicinity of the magnetic bubble generation area, which adversely affects the stabilization of the magnetic bubble.

FIG. 1 shows an example of the configuration of a conventional magnetic bubble generator. That is, a piccus-shaped generation pattern 1 made of permalloy and I-shaped and half disk-shaped transfer patterns 2 and 3 for transfer are formed on a magnetic thin plate such as garnet.
A control hairpin conductor pattern 5 is arranged through the magnetic bubble generation region. In such a configuration, if the crystal temperature increases as described above, the generated bubbles 4 will extend along the inner edge of the hairpin conductor 5 and suddenly contract when the generated current is cut off, resulting in the generation of unnecessary bubbles. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bubble memory element that stabilizes bubbles generated in a magnetic bubble generator and prevents unnecessary bubbles from occurring.

In order to achieve the above object, the bubble memory device of the present invention is a bubble memory device including a valve generating section consisting of a piccus-shaped magnetic material pattern that generates magnetic bubbles and a hairpin conductor for control through the bubble generating region. A picax-shaped magnetic material pattern different from the magnetic material pattern for generating a repulsion magnetic field in the bubble generation region when bubbles are generated is arranged opposite to the magnetic material pattern through the bubble generation region. That is.

The present invention will be described in detail below with reference to examples.

FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention. In the same figure, a picax-shaped generation pattern 1, an I-shaped, a half-disc-shaped transfer pattern 2,
3 and hairpin conductor 5 are as shown in FIG.
The shape of the hairpin conductor 5 is such that parallel grooves are formed in the magnetic bubble generation region, that is, near the upper end of the generation pattern 1. The feature of the present invention is that the magnetic material pattern 11 is opposite to the generating pattern 1 and has the same shape.
are arranged at predetermined intervals. As a result, a repulsive magnetic field is generated in the area 8 of the hairpin conductor 5 between the magnetic material patterns 1 and 11, which is the generation area of magnetic bubbles, when a bubble is generated, and the bubble is stabilized even if there is a local rise in temperature. It is possible to effectively prevent unnecessary bubbles from splitting. Therefore, a large current margin can be achieved.

In addition, in the same figure, patterns 6 and 7 that serve as passages for the guardrail are provided, so that even if an unnecessary pattern occurs, it is possible to release it. However, in the case of the present invention, this is not always necessary.

As explained above, according to the present invention, by arranging a magnetic pattern facing the generation pattern and having an opposite direction through the bubble generation area, a repelling magnetic field is generated when bubbles are generated, thereby effectively stabilizing the bubbles. This makes it possible to effectively prevent the generation of unnecessary bubbles.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional example, and FIG. 2 is an explanatory diagram showing the configuration of an embodiment of the present invention, in which 1 is a generation pattern, 2 and 3 are transfer patterns, 5 is a hairpin conductor, 6, Reference numeral 7 indicates a guardrail pattern, 8 indicates a bubble generation region, and 11 indicates an opposing magnetic material pattern.

Claims (1)

[Scope of Claims] 1. A bubble memory element comprising a bubble generating section consisting of a Pikachus-shaped magnetic material pattern that generates magnetic bubbles and a control hairpin conductor that passes through the bubble generating area, wherein when a bubble occurs, the bubble generating area A bubble memory element characterized in that a picax-shaped magnetic material pattern different from the magnetic material pattern for generating a repulsion magnetic field is arranged opposite to the magnetic material pattern with the bubble generation region interposed therebetween.