JPH067434B2 - Magnetic bubble memory device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic bubble memory device, and more particularly, to a configuration of a magnetic bubble transfer pattern of a replicated gate section for duplicating magnetic bubble information on a minor loop into read major lines. Is.

[Background of the Invention]

In recent years, as a means for increasing the density and integration of magnetic bubble memory devices, it is possible to use a folded minor loop as a minor loop for storing and retaining magnetic bubble information, for example, IEEE Transaction on Magnetics, VOL.MAG-12, No. 6,
Discussed in November 1976.

FIG. 1 is a main pattern portion of a magnetic bubble memory device having a folded minor loop of this type. In the figure, 1a, 1b, 1b, ... Are folded minor loops for storing and holding magnetic bubble information, 2a, 2b, 2c, .. are transfer gates for inputting and outputting magnetic bubbles (hereinafter referred to as bubbles), 3a, 3b, 3c, ... are replicated gates that divide and replicate the bubble.

FIG. 2 is an enlarged plan view of an essential part showing an example of a bubble transfer pattern in the replicated gate portion of the above-mentioned folded type minor loop. In the figure, 11a, 11b, 11c is a corner pattern of each minor loop 1a, 1b, 1c, 12b, 12c is a corner bar pattern of each minor loop 1b, 1c, 13b is between the adjacent minor loop 1a and minor loop 1b short bar pattern bonded, 13c are chevron patterns constituting the short bar pattern coupled between the minor loops 1b and minor loops 1c adjacent to each other, 14a-14n each minor loop 1a, 1b, and 1c, H _R is rotated The magnetic field, P is the magnetic bubble transfer direction.

However, in thus constructed replicate gate, high-density magnetic bubble memory device, high integration is accompanied in each minor loop 1a, 1b, by the spacing between 1c each other is shortened, the rotating magnetic field H _R Is directed in the direction of arrow A, the bias magnetic field margin lower limit value shows both patterns of the short bar pattern 13b and the chevron pattern 14a and the adjacent short bar pattern as shown in FIG.
There is a problem in that a transfer malfunction occurs in which the magnetic bubble B expands by bridging both patterns of the 13c and the chevron pattern 14a, and the bias magnetic field margin is significantly reduced.

[Object of the Invention]

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic bubble memory device having a large bias magnetic field margin by preventing the occurrence of a transfer malfunction.

[Outline of Invention]

In order to achieve such an object, the present invention is to reduce the bubble suction pole generated in the short bar pattern.

Example of Invention

 Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIGS. 3 (a) to 3 (e) are plan configuration diagrams of a short bar pattern constituting a replicated gate for explaining an embodiment of a magnetic bubble memory device according to the present invention. In the figure, the short bar pattern 13 coupled between the minor loops adjacent to each other has a pattern cutting portion 13 _A where the permalloy pattern does not exist on the minor loop side adjacent to the left side in FIG. In b), the pattern cut portion 13 _B is formed in the central portion, and in FIG. 7C, the pattern cut portion 13 _C is formed on the minor loop side adjacent to the right side.
In this case, the width of each of the pattern cut portions 13 _A , 13 _B , and 13 _C is formed to have a dimension substantially equal to the short side width of the short bar pattern 13. Further, in the same figure (d), the pattern cutting part 13 where the permalloy pattern does not exist in the central inclined part
_D is formed. In the figure (e), the opposite ends of the pattern formed and divided in the same manner as the figure (d) are extended, and the short bar pattern is formed by the first pattern piece 13 ₁ and the second pattern piece 13 _2. 13 is configured.

According to such a configuration, the rotating magnetic field of the short bar pattern 13 is provided by providing various pattern cutting portions 13 _A , 13 _B , 13 _C , 13 _{D in} which a permalloy pattern does not exist in a part of the short bar pattern 13. Since the suction pole generated at the tip on the direction A side becomes weak, it is possible to prevent the occurrence of a transfer malfunction as shown in FIG.

FIG. 4 shows the conventional short bar pattern 13b, shown in FIG.
Bias magnetic field margin ΔH _B (e) shown in FIG. 3 when using 13c and bias magnetic field margin ΔH _B (e) when using the short bar pattern 13 according to the present invention shown in FIG. (O) on the horizontal axis is the conventional example of FIG. 2, (a), (b), (c), (d), (e).
Shows the respective embodiments shown in FIG.
As is clear from the figure, the bias magnetic field margin can be greatly improved by adopting the short bar pattern configuration as shown in FIGS. 3 (a) to 3 (e).

〔The invention's effect〕

As described above, according to the present invention, the occurrence of the transfer malfunction that expands the magnetic bubble in both the short bar pattern and the transfer pattern is eliminated, and the bias magnetic field margin can be significantly improved. It has an extremely excellent effect of obtaining a magnetic bubble memory device with high density and high integration.

[Brief description of drawings]

FIG. 1 is a main part pattern diagram showing an example of a magnetic bubble memory device having a folded minor loop, FIG. 2 is an enlarged plan view of the main part showing a bubble transfer pattern of a replicated gate part of the minor loop, and FIG. 3 (a). (E) is a plane configuration diagram of a short bar pattern for explaining an embodiment of a magnetic bubble memory device according to the present invention, and FIG. 4 is a magnetic bubble memory device using a conventional short bar pattern and a short bar pattern according to the present invention. It is a figure which shows a bias magnetic field margin. 1a, 1b, 1c …… Folded minor loop, 2a, 2b, 2c …… Transfer gate, 3a, 3b, 3c …… Replica gate,
11a, 11b, 11c …… Corner pattern, 12b, 12c …… Corner bar pattern, 13,13b, 13c …… Short bar pattern, 13
_A , 13 _B , 13 _C , 13 _D ...... Pattern cutting part, 13 ₁ ...... First pattern element, 13 ₂ ...... Second pattern element.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Yanai 3300 Hayano, Mobara-shi, Chiba Hitachi Mobara factory (72) Inventor Tetsuaki Suzuki 3300 Hayano, Mobara-shi Chiba Hitachi Mobara factory (72) 72) Inventor Hisaya Keida 3300, Hayano, Mobara-shi, Chiba, within the Mobara Plant, Hitachi, Ltd. (72) Inventor, Seiichi Nishiyama 3300, Hayano, Mobara, Chiba, Ltd., within the Mobara, Hitachi, Ltd. (72) Inventor, Mitsuru Sekino Tokyo 1479, Kamimizuhonmachi, Kodaira-shi, Hitachi In-house (72) Inventor, Hiroshi Nakakai Hiroshi Nakakai, Tokyo 1479, Kamimizu-honmachi, Kodaira, Tokyo In-house (72), Inventor, Toshiya Kadoyama, Tokyo 1479 Kamimizuhonmachi, Kodaira-shi Hitachi My Croco Rain Yuta engineering shares meeting house

Claims (1)

[Claims] 1. A plurality of magnetic bubble transfer patterns (14a,
14n), a plurality of minor loops (1a, 1b, 1c) for storing information, a replicated gate (2c, 2b, 2a) that divides and duplicates a magnetic bubble, and the magnetic bubble is opposed at the gate portion. A short bar pattern (13b, 13) having two parallel straight line portions and a diagonal line portion connecting the straight line portions in the corner portion which is turned and transferred in the direction.
c) In the magnetic bubble memory device arranged between the minor loops adjacent to each other, all the shaded portions are cut out {13D, FIG. 3 (d), (e)} The short bar pattern has two patterns. A magnetic bubble memory device characterized by being separated into.