JPS63870B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a magnetic bubble memory device used as a storage device for an electronic computing device or a terminal thereof, and particularly to a bubble magnetic domain detector thereof.

(2) Background of the technology Magnetic bubble memory devices are expected to have a promising future as large-capacity memory because they are nonvolatile, capable of large-capacity, high-density storage, have low power consumption, and are small and lightweight. There is. This magnetic bubble memory device takes advantage of the fact that magnetic bubbles can move freely within a magnetic thin film by a magnetic field.As shown in FIG. It is composed of magnetic field generating coils 2, 2', bias magnetic field generating magnets 3, 3' for stably holding the bubble, and the like.

The memory chip 1 is made by forming a magnetic garnet thin film on a gadolinium-gallium-garnet substrate by liquid phase epitaxial growth, for example, and forming a bubble transfer path by arranging permalloy thin film patterns on the thin film. A bubble generator generates bubbles according to the information, transfers them to a bubble transfer path, and records the information by setting "1" where there is a bubble and "0" where there is no bubble. It is also designed to read out information.

(3) Prior Art and Problems FIGS. 2 and 3 are diagrams for explaining the configuration of a conventional bubble magnetic domain detector, with FIG. 2 showing a schematic diagram and FIG. 3 showing a specific example. Note that FIG. 3a shows the left end of the bubble magnetic domain detector, and FIG. 3b shows the right end. In FIGS. 2 and 3, 4 is a stretcher section in which a large number of chevrons or asymmetric chevron patterns are arranged in parallel, arrow 5 is a bubble traveling direction, 6 is a bubble magnetic domain detection section, 7 and 7' are its lead wires, Reference numerals 8 and 8' indicate the terminals, 9 and 9' indicate the guardrail, and arrows 10 and 10' indicate the direction in which the bubble travels in the guardrail, respectively.

To explain the operation of this bubble magnetic domain detector, the transferred bubble is greatly stretched in the direction perpendicular to the bubble traveling direction in the stretcher section 4.
When it passes through the detecting section 6 in which a part of the chevron or asymmetric chevron is connected to form a current path, it is read out as a change in magnetic resistance. This type of bubble magnetic domain detector is advantageous in production because it can be made at the same time as a transfer pattern using permalloy, etc., and is generally used, but the lead wires 7 and 7' that supply the detection current are also made of permalloy. Guardrail patterns 9 and 9' are installed on the detection section 6 in the direction of sweeping out floating bubbles to the left and right to prevent bubbles that trap surrounding floating bubbles from entering the detection section and causing malfunctions. They are placed on the left and right to prevent excess bubbles from entering. However, even with this method, it is not possible to prevent floating bubbles from entering when the pattern width is wide or when operating at high temperatures, and once bubbles enter the inside of the guardrail, unnecessary bubbles can be detected relatively easily. The disadvantage was that it could reach the target area and cause malfunctions.

(4) Purpose of the Invention In view of the above-mentioned conventional drawbacks, the present invention provides a bubble magnetic domain detector provided with a guardrail that can effectively eliminate floating bubbles that have entered through lead wires before reaching the detection section. The purpose is to

(5) Structure of the Invention According to the present invention, this object is to arrange a plurality of bubble magnetic domain transfer patterns such as a Chevron pattern or an asymmetric Chevron pattern at a constant period in a direction perpendicular to the traveling direction of bubbles, A bubble magnetic domain detection section that electrically connects these and detects bubble magnetic domains using the magnetoresistive effect; and a lead wire made of the same material as the transfer pattern to supply a detection current to the detection section. In a bubble magnetic domain detector equipped with a bubble magnetic domain detector, a bubble magnetic domain transfer stage in which a plurality of bubble magnetic domain transfer patterns such as chevron or asymmetric chevron patterns are arranged at a constant period in a direction perpendicular to the traveling direction of the bubble magnetic domain is arranged in the traveling direction of the bubble. A plurality of stages are arranged to constitute a bubble magnetic domain transfer block, the blocks are arranged on both sides of the bubble magnetic domain detection section, and one of the plurality of bubble magnetic domain transfer stages constituting the bubble magnetic domain transfer block is connected to the lead. This is achieved by providing a bubble domain detector characterized by a line running through it.

(6) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 4 and 5 are diagrams for explaining the bubble magnetic domain detector according to the present invention, with FIG. 4 being a schematic diagram showing its configuration, and FIG. 5 being a diagram showing an embodiment. Note that FIG. 5a shows the left end of the bubble magnetic domain detector, and FIG. 5b shows the right end.

4 and 5, 11 is a stretcher section, arrow 12 is a bubble traveling direction, 13 is a bubble magnetic domain detection section, 14 and 14' are its lead wires, and 1
5 and 15' are the terminals, 16 and 16' are the guardrails, arrows 17 and 17' are the bubble traveling directions in the guardrails, 18 and 18' are the bubble domain transfer blocks, and arrows 19 and 19' are the bubbles in the bubble domain transfer blocks. Each shows the direction of travel.

In this embodiment, as shown in FIG. 5, the stretcher section 11 has a large number of chevrons or asymmetric chevron patterns arranged in parallel, and the bubble magnetic domain detection section 13 has a large number of bubble magnetic domain transfer patterns such as chevrons or asymmetric chevron patterns. They are arranged at regular intervals in a direction perpendicular to the bubble traveling direction 12, and are electrically connected to form a current path, with lead wires 14 and 14' made of the same material as the bubble domain transfer pattern connected to both ends. has been done. Guardrails 16, 16' remove unnecessary bubbles by arrows 17, 1
A large number of chevron patterns are arranged so as to sweep out in the 7' direction. The above is the same as the conventional example shown in FIGS. 2 and 3. A feature of the present invention is that, as shown in FIGS. 4 and 5, bubble magnetic domain transfer blocks 18, 18' (indicated by chain lines in FIG. 5) are provided. The bubble domain transfer blocks 18, 18' form a bubble domain transfer stage by arranging a plurality of chevrons or asymmetric chevron patterns at a constant period in a direction perpendicular to the bubble traveling direction 12. are arranged in multiple stages in the bubble traveling direction 12. The bubble domain transfer blocks 18, 18' are arranged at both ends of the bubble domain detection section 13, and the lead wires 14, 14' pass through any one of the plurality of bubble domain transfer stages constituting the block.

In this embodiment configured as described above, even if an unnecessary bubble magnetic domain enters along the lead wires 14, 14', the bubble magnetic domain transfer blocks 18, 1
8' indicates the bubble traveling direction 1 as shown by arrows 19 and 19'.
It can be swept out in the same direction as 2. Thereby, it is possible to effectively prevent unnecessary bubbles from entering the bubble magnetic domain detection section 13.

FIG. 6 is a diagram showing another embodiment of the bubble magnetic domain detector according to the present invention. In this figure, the same parts as in FIG. 5 are designated by the same reference numerals. This embodiment differs from the previous embodiment in that the lead wires 14, 14', which were extending to the left and right, are bent in the middle and deformed so that they extend upward, and the effect is the same as that of the previous embodiment.

(7) Effects of the Invention As explained in detail above, the bubble magnetic domain detector of the present invention prevents unnecessary bubbles from entering the bubble magnetic domain detection section by providing a bubble magnetic domain transfer block covering the lead wire. It is highly effective that it can be used in magnetic bubble memory devices to improve their reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining a magnetic bubble memory device, FIGS. 2 and 3 are diagrams for explaining a conventional bubble magnetic domain detector, and FIGS. 4 and 5 are diagrams for explaining bubble magnetic domain detection according to the present invention. A diagram to explain the vessel,
FIG. 6 is a diagram for explaining another embodiment. In the drawing, 11 is a stretcher section, 13 is a bubble magnetic domain detection section, 14 and 14' are lead wires, and 1
5, 15' are terminals, 16, 16' are guardrails,
18 and 18' indicate bubble domain transfer blocks, respectively.

Claims (1)

[Claims] 1. Arranging a plurality of bubble magnetic domain transfer patterns such as a Chevron pattern or an asymmetric Chevron pattern at a constant period in a direction perpendicular to the direction of bubble travel, electrically connecting them, and utilizing the magnetoresistive effect. A bubble magnetic domain detector comprising a bubble magnetic domain detecting section that detects bubble magnetic domains by using a chevron or an asymmetric chevron pattern, and a lead wire made of the same material as the transfer pattern for supplying a detection current to the detecting section. A bubble magnetic domain transfer block is constructed by arranging a plurality of bubble magnetic domain transfer stages in the direction of bubble movement in which a plurality of bubble magnetic domain transfer patterns such as are arranged on both sides of the bubble magnetic domain detection section, and the lead wire passes through any one of a plurality of bubble magnetic domain transfer stages constituting the bubble domain transfer block.