JPS63201980A - Magnetic bubble generator - Google Patents

Abstract

PURPOSE:To prevent the production of excess bubble by using the through hole technology so as to cross a hair pin conductor pattern at a proper location of at least two patterns in parallel with each other. CONSTITUTION:In the magnetic bubble generator formed on a bubble crystal 1 through the combination of a soft magnetic thin film pattern 5 and a hair pin conductor pattern 3, at least two patterns 3a, 3b adjacent to the hair pin conductor pattern 3 are crossed by using a through hole to form a loop. Since the hair pin conductor pattern 3 is formed as a loop by a conductor 9 in this way, a strong attracting magnetic field formed in giving a generated current (i) in the direction of arrow is generated in a part A only in the loop and a repulsion magnetic field is caused at a part B. Thus, the generated bubble is confined in the loop, then no branching is caused and production of excess bubble is prevented.

Description

[Detailed Description of the Invention] [Summary] This is a magnetic bubble generator in which a hairpin-like conductor pattern combined with a soft magnetic thin film pattern is subjected to through-hole technology at appropriate positions of at least two parallel patterns. By using and intersecting the bubbles, it is possible to prevent the bubbles from overextending when they are generated, and to prevent malfunctions.

[Industrial application field]

The present invention relates to a magnetic bubble generator for a magnetic bubble memory device used in a storage device such as an electronic computing device.

A magnetic bubble memory element is produced by forming a thin film of magnetic garnet by liquid phase epitaxial growth on a non-magnetic substrate such as a single crystal of gadolinium, gallium, or garnet.
On top of that, a bubble transfer path is formed with a matrix of half-disk or asymmetric chevron patterns using a soft magnetic thin film such as permalloy, and bubbles generated from a bubble generator according to information are sent to the transfer path. The information is stored as "1" if there is a bubble in the pattern, and as "0" if there is no bubble.

[Conventional technology]

FIG. 2 is a diagram showing a conventionally known magnetic bubble generator. As shown in the figure, a hairpin-shaped conductor pattern 3 is formed on a bubble crystal 1 via a spacer 2. A soft magnetic thin film pattern 5 made of permalloy or the like is formed thereon via an insulating layer 4, and bubbles are generated by an attractive magnetic field generated when a generating current is passed through the hairpin-shaped conductor pattern 3.

[Problem that the invention seeks to solve]

In the conventional magnetic bubble generator described above, when the bubble diameter becomes smaller due to the higher density of the magnetic bubble memory element, the generated bubbles 6 extend along the inside of the hairpin and branch out, as shown in FIG. After the current is cut off, the bubbles tend to break off and become separated into original bubbles and extra bubbles, which can lead to errors. This is particularly likely to occur on the side where the bias magnetic field is low or the generated current is large.

The present invention was created in view of these points.
The object of the present invention is to provide a magnetic bubble generator that can suppress the generation of excess bubbles.

[Means for solving problems]

Therefore, in the present invention, in the example shown in FIG.
In the magnetic bubble generator formed on the bubble crystal 1 by combining the soft magnetic thin film pattern 5 and the hairpin-shaped conductor pattern 3, adjacent small portions of the hairpin-shaped conductor pattern 3 (both through the two patterns 3a and 3b) are used. It is characterized by using holes that intersect to form a loop shape.

[For production]

By forming the conductor pattern 3 into a loop shape, the expansion of bubbles can be confined within the loop, making it possible to prevent the generation of excess bubbles due to excessive expansion.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention, in which a is a plan view;
b is an enlarged cross-sectional view taken along line bb in figure a.

As shown in FIG. 1, this embodiment is similar to the conventional example explained in FIG. 2 in that a soft magnetic thin film pattern 5 and a hairpin-shaped conductor pattern 3 are combined, and the main points of this embodiment , two substantially parallel adjacent patterns 3a and 3b of the hairpin-shaped conductor pattern 3 are crossed using a through-hole technique. That is, one of the two parallel patterns 3a and 3b is cut in the middle, and the drawer MA3C is placed on the opposite side of the pattern 3b.
and 8, and conductor 9 connects pattern 3a and lead line 3.
C is connected. Note that there are methods such as plating to connect through holes.

In this embodiment configured as described above, the hairpin-shaped conductor pattern 3 is formed into a loop by the conductor 9, so that the strong attractive magnetic field generated when the generated current i is passed in the direction of the arrow is only in the section A within this loop. A repulsive magnetic field is generated in part B. As a result, the bubbles generated are trapped within the loop.

Therefore, there is no branching as in the conventional case, and the generation of extra bubbles is prevented.

〔Effect of the invention〕

As described above, according to the present invention, generation of extra bubbles can be easily suppressed and the current margin of the generated current can be increased. In addition, a sufficient current margin can be obtained even when the chip temperature is high (approximately 80°C to 90°C), making it possible to eliminate the need for temperature compensation measures conventionally required in such cases, making it extremely practical. Useful.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a conventional magnetic bubble generator, and FIG. 3 is a diagram for explaining problems with the conventional magnetic bubble generator. In FIG. 1, l is a bubble crystal, 2 is a spacer, 3 is a hairpin-shaped conductor pattern, 4 is an insulating layer, 5 is a soft magnetic thin film pattern, 7.8 is a through hole, and 9 is a conductor.

Claims (1)

[Claims] 1. A magnetic bubble generator formed on a bubble crystal (1) by combining a soft magnetic thin film pattern (5) and a hairpin-shaped conductor pattern (3), wherein the hairpin-shaped conductor pattern (3) is formed on a bubble crystal (1). A magnetic bubble generator characterized in that at least two adjacent patterns (3a, 3b) of ) are crossed using through holes to form a loop shape.