JPS60261097A - Magnetic bubble memory element - Google Patents

Abstract

PURPOSE:To increase the bias magnetic field margin by providing a cut-off part to a short bar pattern coupled with a replicate gate so as to prevent generation of transfer malfunction. CONSTITUTION:The pattern cut-off part 13A where no ''Permalloy(R)'' exists is provided to the short bar pattern 13 connecting the replicate gates of multually adjacent minor loops and an attracting pole generated at the tip in the direction of a rotating magnetic field of the pattern 13 is weakened. Thus, generation of magnetic bubble transfer malfunction is prevented, and a bias magnetic field margin is increased and a magnetic bubble memory element with high quality, high reliability, high density and high circuit integration is attained.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic bubble memory device, and in particular to the configuration of a magnetic bubble transfer pattern in a replicate gate section that divides and copies magnetic bubble information on a minor loop to a read major line. It is related to.

[Background of the invention]

In recent years, as a means of increasing the density and integration of magnetic bubble memory elements, it has become possible to use folded-fold type minor loops as minor loops for storing magnetic bubble information, such as IBBFI Trinsictronon Mag.
net 1cs, VoL, MAG-12, No
, 6, November 1976.

FIG. 1 is a pattern diagram of the main part of a magnetic bubble memory element equipped with this moderately folded minor loop. In the same figure, % 1111 +1b+IC+"... is a trivial minor loop that stores and holds magnetic bubble information, 2
a l 2 b + 2 c s -... is a transfer game that inputs and outputs magnetic bubbles (hereinafter referred to as bubbles) %3a+sb+ace... is a replicate gate that divides and copies bubbles.

FIG. 2 is an enlarged plan view of a main part showing an example of the bubble transfer pattern of the replicate gate portion of the above-mentioned folded-over-fold type minor lube. In the same figure, 118111bllI
C is the corner pattern of each minor loop 1a, ib+lc, 12b+12c is the corner bar pattern of each minor loop 1b+1c, tab is the mutually adjacent minor loop 1
13C is a short bar pattern connected between the minor loop 1b and the minor loop 1b which are adjacent to each other;
-, 1451 to 14n are each minor loop 1 ” a
1 Chevron pattern composing b * l c, H
B is the rotating magnetic field and P is the magnetic bubble transfer direction.

However, in a replica card game configured in this way, the distance between each liner loop 1a+1b and the ICs is shortened as magnetic puzzle memory elements become denser and more highly integrated. When facing in the direction of the arrow, both the short bar pattern 13b and the chevron pattern 14a and the adjacent short bar pattern 11 and chevron pattern 14M, as shown in the same figure, at the lower limit of the bias magnetic field margin. There is a problem in that a transfer malfunction occurs when the magnetic bubble B is elongated due to bridging, and the bias magnetic field margin is significantly reduced.

[Purpose of the invention]

Therefore, the present invention has been made in view of the above-mentioned nine conventional problems, and its purpose is to provide a magnetic bubble memory element that prevents the occurrence of transfer malfunctions and increases the bias magnetic field margin. It is in.

[Summary of the invention]

To achieve this objective, the present invention is designed to reduce the bubble suction poles that occur in the short bar pattern.

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

FIGS. 3(1) to 3(e) are plan configuration diagrams of a short bar pattern constituting a replicate gate for explaining an embodiment of a magnetic bubble memory device according to the present invention. In the same figure, the short bar pattern 13 connected between mutually adjacent minor loops has a permalloy pattern on the minor loop side adjacent to the left side in FIG. In (b), the pattern cut portion HB is formed at the center, and in the same figure (C), the pattern cut portion 13c is formed on the minor loop side adjacent to the right side. In this case, each of these pattern cutting parts 13*13. It is formed to have a dimension approximately equal to the short side width of the short bar pattern 13 manufactured by IIC.

In addition, in FIG. 4(d), a pattern cut portion 18D in which no permalloy pattern exists is formed in the central inclined portion.

In the same figure (e), the opposing ends of the pattern formed and divided in the same way as in the same figure (d) are extended, and the first pattern piece 1
31 and the 20th pattern piece 11 constitute a short bar pattern 13.

According to such a configuration, the short bar p-713
As a result of providing pattern cutting parts 18m, 13m, llc, llp for each grain where permalloy butter patterns do not exist in a part of the short bar pattern 13, the rotating magnetic field direction A1 of the short bar pattern 13
Since the suction pole generated at the tip of 1ll becomes weak, it is possible to prevent the occurrence of a transfer malfunction as shown in FIG. 2.

Figure 4 shows the conventional short bar pattern la shown in Figure 2.
The bias magnetic field margin (indicated by the diagonal line in the figure) ΔHB (Oe) when using the b port 8C and the bias magnetic field margin 7n1 (0. ), the horizontal axis shows the conventional example (0) in enlarged Fig. 2, (a),
(b), (C), (d), and (@) indicate each embodiment shown in FIG. 3, respectively. As is clear from the figure, the bias magnetic field margin can be greatly improved by using the short bar pattern configuration as shown in FIGS. 3(1) to (III).

〔Effect of the invention〕

As explained above, according to the present invention, the occurrence of transfer malfunctions that extend magnetic bubbles in both the short S-pattern and the transfer pattern is eliminated, and the bias magnetic field margin can be greatly improved, thereby improving quality and The present invention has an extremely excellent effect in that a highly reliable magnetic bubble memory element with high density and high integration can be obtained.

[Brief explanation of drawings]

FIG. 1 is a pattern diagram of the main part showing an example of a magnetic bubble memory element having a folded overlapping minor loop, FIG. 2 is an enlarged plan view of the main part showing the bubble transfer pattern of the replicate gate part of the minor loop, and ) to (6) are plan configuration diagrams of short bar patterns for explaining embodiments of the magnetic bubble memory device according to the present invention, and FIG. 4 is a magnetic bubble memory device using the conventional short bar pattern and the short bar pattern according to the present invention. FIG. 3 is a diagram showing the bias magnetic field margin of FIG. 1allbllC---folded overlapping minor loop, 2
Sorrow + 2b + 2c...transfer game), 3a. sb+ac...loop replicate gate, lla, ll
b, jiG@@*@2-Napapy, 12bltzC@
@... Corner bar pattern, la, 13b113C.
...1 short bar pattern, 13*, 11, 13c,
13p・Φ...Pattern cutting part, 131・Ichiban・First pattern piece s 11"...Cloudy second pattern piece. Fig. 1 Fig. 2 Fig. 3 Fig. 32

Claims (1)

[Claims] A short bar pattern that connects mutually adjacent replicate gates in a magnetic bubble memory device having a plurality of folded and overlapping minor loops having a transfer gate that inputs and outputs magnetic bubbles and a replicate gate that divides and replicates the magnetic bubbles. A magnetic bubble memory element characterized in that a pattern cut portion is provided in which the pattern member does not exist.