JPS61233490A - Magnetic bubble memory element - Google Patents

Abstract

PURPOSE:To obtain a magnetic bubble memory element with high quality and reliability by providing a pattern generating a repulsive magnetic pole to the tip of an inverse 180 deg. turn corner pattern to cancel an unnecessary attracting magnetic pole and transfer normally a magnetic bubble. CONSTITUTION:A rod pattern 27 having longer length than the width generating the repulsive magnetic pole 26 is formed and arranged on a tip 22a in the magnetic bubble transfer direction of the inverse T-shaped pattern 22. Thus, when a planer rotating magnetic field HR is directed in the direction of the arrow 23, a repulsive magnetic field 26 is generated on the tip 27a in the direction of the inverted T pattern 22 of the rod pattern 27 to prevent the attracting magnetic field 24 from attracting the magnetic bubble B. Thus, the magnetic bubble B is attracted by the attracting magnetic pole 25 and stable operation is attained even in a weak bias magnetic field HB.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic bubble memory device, and more particularly to a magnetic puzzle transfer path forming an inverted 180 & turn corner portion of a folded overlapping minor loop.

[Background of the invention]

In general, in a magnetic bubble memory device, the magnetic puzzle transfer pattern is an element that constitutes a major loop that transfers write information and read information depending on the presence or absence of magnetic bubbles, and a minor loop that forms an area for storing information. A shape that corresponds to the direction is used.

In recent years, with the increase in the density and integration of magnetic bubble mesh elements, so-called folded-fold type minor loops have been developed, in which a magnetic bubble transfer path is formed by a folded closed loop, instead of a minor loop that forms an area for storing information. For example IER:
E, Trans 0MAG-15.

11&L6, P1691 to P1696, etc.

This type of minor loop has a linear transfer section that transfers magnetic bubbles in a straight direction, and a linear transfer section that transfers magnetic bubbles in a positive direction.
It is composed of a positive 180 degree turn corner section for 0 degree conversion and a reverse 180 degree turn corner section for 180 degree conversion in the negative direction.

However, in the inverted 180 degree turn corner section configured in this way, the inverted 180 degree turn corner pattern that forms this inverted 180 degree turn corner section, for example, an inverted T-shaped pattern, is limited to the length of this pattern. The problem is that when the direction matches the direction of the rotating magnetic field, a large magnetic bubble attracting magnetic pole is formed at the longitudinal tip of the pattern, which obstructs the normal transfer of the magnetic puzzle and narrows the stable bias magnetic field region of the minor loop. was there.

[Purpose of the invention]

One object of the present invention is to provide a magnetic bubble memory device with an expanded stable operation bias magnetic field region by reducing the problem of reverse 180 degree turn corner patterns.

[Summary of the invention]

According to one embodiment of the present invention, by providing a pattern that generates a repelling magnetic pole at the tip of the reverse 180-degree turn corner pattern, unnecessary attracting magnetic poles are canceled out and normal transfer of magnetic bubbles is made possible. It is something.

[Embodiments of the invention]

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

FIG. 1 is an enlarged diagonal plan view illustrating an example of a magnetic bubble memory element according to the present invention. In the figure, 1 is a minor lube that stores information, 2 is a read measure line that transfers read information, 3 is a write measure line that transfers write information, 4 is a magnetic puzzle detector that converts magnetic bubbles into electrical signals, and 5 is a magnetic puzzle detector. A magnetic bubble generator that writes information onto the write mesh line 3, 6 a replicate gate that copies the information on the liner loop 1 onto the read mesh line 2, and 7 the information on the write mesh line 3 and the information in the minor loop 1. 8 is a guardrail for preventing unnecessary magnetic bubbles from entering from the outer periphery, and 9 is a bonding pad for connecting these transfer circuits with an external circuit.

In addition, the minor loop 1° lead mesh line 2 and the light mesh line 3, which are magnetic bubble transfer paths, are formed by a permalloy thin film pattern 1, as shown in an enlarged plan view of the main part in FIG.
It is made up of 0. Then, by magnetizing these patterns 10 with an external magnetic field H that rotates within the pattern plane, a moving magnetic bubble attracting magnetic pole is generated, and in the figure, the rotating magnetic field M1 rotates counterclockwise. At this time, the magnetic bubble is transferred in the direction of arrow P. In this case, when the rotating magnetic field Ha rotates once, the magnetic bubble is 1 of the pattern 10.
K is transferred for a period λ. In addition, the same figure (JL
) is called a half-disk pattern, (b) is called an asymmetric chevron pattern, and (C) is called a wide gap pattern, and these patterns are most commonly used in recent years. In addition, the magnetic bubble transfer path using such a transfer method is called a permalloy drive method, and this is also commonly used.

The magnetic bubble memory element of the present invention also uses this method.

Figure 3 shows one of the other minor loops forming the memory area of the magnetic bubble memory element, and the memory area of the magnetic bubble memory element is constructed by arranging many minor loops of this type in parallel. has been done. In the same figure,
The magnetic bubble transfer path is simplified by a solid line, and the direction of arrow P indicates the transfer direction of the magnetic bubble. As shown in the figure, such a minor loop is composed of a closed loop transfer path. The shape of this closed-loop transfer path is optimal for realizing a high-density magnetic bubble memory element, as shown in FIG.

Folded folded minor loop 11 shown in (b) and (e)
, 12°13 are now often used. At this time)
The shape of the overlapping minor loose is shown in Figure 3(a).
(b).

Various types other than those shown in (e) are also applicable.

FIG. 4 is an enlarged pattern plan view of the main part showing one embodiment of the above-mentioned reverse 180 degree turn corner section.

In the same figure, 20m and 20b are magnetic bubble transfer paths that constitute one folded minor loop, 21 is an asymmetrical chevron pattern that constitutes a linear transfer section of the transfer path 20m and 20b, and a 2ft inverted 180iE tanner corner section. This is an inverted T-shaped pattern.

However, in the inverted 180 degree turn corner section configured as shown in FIG. A magnetic pole 24 that attracts the magnetic bubble B is generated at the tip 22m, and when the bias magnetic field H1 is weak, this attracting magnetic pole 24 becomes stronger than the attracting magnetic pole 25 generated at the end 21m of the chevron pattern 21, and the magnetic bubble B is no longer transferred correctly.

Therefore, in the present invention, as shown in FIG. 5, a bar-shaped pattern 2T whose length is larger than the width for generating the repelling magnetic pole 26 is formed and arranged at the tip 22m of the inverted T-shaped pattern 22 on the side in the magnetic bubble transfer direction.

According to such a configuration, the in-plane rotating magnetic field H1 is
When facing in the direction of , a repulsive magnetic field 26 is generated at the tip 27m of the rod-shaped pattern 27 in the direction of the inverted T-shaped pattern 22, which prevents the attractive magnetic field 24 from attracting the magnetic bubble B. Therefore, it is attracted to the magnetic bubble B#i attracting magnetic pole 25, and stable operation is possible even in a state where the bias magnetic field Ha is weak.

Figure 6 shows the stable operating range I in the minor loop of the inverted 180 degree turn corner using the conventional inverted T-shaped pattern 22.
This shows the stable operating range I in a minor loop at a reverse 180 degree turn corner using an inverted T-shaped pattern 22 provided with a bar pattern 21 according to the present invention. As is clear from the figure, by providing the bar-shaped pattern 2T, it was possible to expand the stable operating range only in the shaded area.

Curve I is the stable operating range! , 1, and these values are all constant.

FIGS. 7 to 11 are inverse 1 diagrams showing other embodiments of the present invention.
This is an enlarged plan view of the main parts of the 80-degree turn part, and the same parts as in the previous figure are given the same reference numerals. In these figures, FIGS. 7(a) and 2) have a trapezoidal bar pattern at the tip of the inverted T-shaped pattern 22, and FIGS. 8(a) and (
In b) the asymmetric chevron pattern 29 is shown in FIG.
Even if the wide gap pattern 30 is formed in ) and (b), the modified wide gap pattern 31 is formed in FIGS. Effects can be obtained.

In addition, in the above-mentioned embodiment, the case where an inverted T-shaped pattern was used as the inverted 180 degree main corner pattern was explained, but the present invention is not limited to this.
Of course, similar effects can be obtained by using patterns of other shapes, such as an inverted triangle, for example.

〔Effect of the invention〕

As explained above, according to the embodiment of the present invention, reverse 180
By providing the spring 7 that generates a repelling magnetic pole at the tip of the turn corner pattern), it cancels out unnecessary attractive magnetic poles and enables normal transfer of magnetic bubbles, increasing the stable operating range of the bias magnetic field region. This has an extremely excellent effect in that a magnetic bubble memory element which is greatly expanded and has high quality and reliability can be obtained.

[Brief explanation of drawings]

Figure N1 is an enlarged view to explain the magnetic bubble memory device according to the present invention, Figure I@2, et al.) - (e) is an enlarged view of the main part showing examples of various permalloy patterns forming magnetic puzzle transfer paths. Plan view, 1g3 diagram (a), (b)
. (e) is a diagram showing various shapes of the folded 9-fold minor loop, FIG. The figure is an enlarged plan view of a main part of a reverse 180-degree turn corner showing an embodiment of the present invention, FIG. 6 is a diagram showing stable operating ranges in the minor loop of magnetic bubble memory elements according to the conventional and the present invention, and FIG. ), (b) to 11th
The figure is an enlarged plan view of a main part of a reverse 180R turn corner section showing another embodiment of the present invention. 20a I 20b @...Fist magnetic bubble transfer path, 21
...--Non-ms Chevron Bamen, 22@...Working reverse T
Shape pamen, 21...rod-shaped pattern, 28-..."
Trapezoidal bar pattern, 29...Asymmetric chevron pattern, 30ψ...-Wide gap pattern,
3111@-・Deformed wide gap pattern, 32・Curious bending curved Shiver pattern. Figure 1 Figure 2 Figure 3 (.) (b) (C) Figure 4 Figure 5 Figure 6 @ Rotating magnetic field HR (6e) Figure 7 (0) (b) Figure 8 (0, (b) ) Figure 9 (0) (b) Figure 10 (Q) (b)

Claims (1)

[Claims] A magnetic bubble transfer path including at least a transfer straight section that transfers magnetic bubbles in a linear direction and an inverse 180 degree turn corner section that changes the transfer direction of magnetic bubbles by 180 degrees, the inverse 180 degree turn corner section being 180 to form
A magnetic bubble memory element characterized in that a pattern that generates a repulsive magnetic pole is provided on the magnetic bubble transfer direction side of a turn corner pattern.