JPS598907B2 - magnetic bubble storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble information writing device that generates magnetic bubbles and transfers required write information bubbles to a storage loop, and provides a device that can accurately write nucleated magnetic bubbles. It is something.

5. A magnetic bubble storage device expresses information 1 and 0 by the presence or absence of magnetic bubbles, and forms a shift register with a loop-shaped transfer path that sequentially transfers the magnetic bubbles.

A magnetic bubble is sent into it and stored as information. To transfer magnetic bubbles, a permalloy transfer pattern such as a T-bar, aperon, or a Y-Y1 half disk is formed on a magnetic thin plate such as magnetic 10 garnet, and the magnetic bubble is transferred under a static magnetic field perpendicular to the magnetic thin plate. A rotating magnetic field parallel to the plane of the thin plate is applied to magnetize and transfer the transfer pattern. On the other hand, there are two methods for generating bubble 15 magnetic domains: one that divides a seed bubble and one that performs nucleation. There is.
However, in the Nu Creation type generator 20,
There is a risk of malfunction due to stray bubbles, which impedes the reliability of information writing. FIG. 1 shows a conventional NuCreation type generator G, in which a hairpin-shaped control conductor pattern 2 is formed on a magnetic bubble transfer path 25 consisting of a modified half-disc pattern 11 made of permalloy or the like. A bubble magnetic domain B1 is generated in the hairpin portion of the control conductor 2 by passing a pulse current i synchronized with the direction of the rotating magnetic field HR and creating a locally strong reverse magnetic field.

The generated magnetic bubbles are transferred in the direction of the arrow (to the left in the figure) as B2... by the 30-rotation magnetic field. Thus, under the action of a bias magnetic field and a rotating magnetic field HR. In response to the information “1” and “o”, the generator current i to the control conductor pattern 2 is “ON”・3
5 "OFF", magnetic bubble information is written. However, in such a nucleation-type magnetic bubble generation/writing device, malfunctions are likely to occur near the critical values of the operating margin region of the bias magnetic field and the generator current.

That is, unnecessary bubbles are generated in the control conductor 2,
They repel each other and cause write errors such as crowding of empty positions on the transfer path. For this reason, the bias magnetic field margin, generator current, and chip temperature margin of the magnetic bubble information writing device are extremely narrow. FIG. 2 shows the margin of the bias magnetic field HR relative to the rotating magnetic field HR required for the bubble generator to operate normally, and malfunctions in the generator tend to occur near the lower limit value D. FIG. 3 shows the margin of the generator current value with respect to the magnetic bubble chip temperature. If the chip temperature is to be guaranteed over a wide range, the generator current value is limited as shown by the broken line. In particular, as the temperature increases, the upper limit value drops dramatically, which increases the burden of thermal design such as heat radiation. The present invention prevents malfunctions near critical operating margins in magnetic bubble generation writing devices, and improves operating characteristics by increasing the upper limit of the generator current and lowering the lower limit of the bias magnetic field, for example, as shown by the chain line. With the goal. In order to achieve this object, the present invention provides a magnetic bubble storage device that generates, splits, extinguishes, and controls the traveling direction of magnetic bubbles using a local magnetic field generated by a control conductor pattern and a rotating magnetic field that acts on a permalloy pattern. , the bubble generating means continuously generates bubbles for each cycle of the rotating magnetic field, and a first conductor pattern for controlling the generating means, and a first conductor pattern for controlling either the division 9 annihilation 9 or the control of the traveling direction. two conductor patterns are connected in series so that the directions of local magnetic fields generated by the first and second conductor patterns are opposite, and the first and second conductor patterns of both means are connected on the same bubble transfer path. , and at least two permalloy patterns whose positions differ by 90 degrees or more with respect to the direction of the rotating magnetic field are arranged in the transfer path so as to face the first and second conductor patterns, respectively. This paper proposes a device.

Next, details of the present invention will be explained based on illustrated embodiments. FIG. 4 shows the first embodiment.

A bubble generator G is provided at the negative end of a transfer path 1 consisting of an example of a transfer pattern 11, and the generator G is provided with a control conductor pattern 2 for generating bubbles. The point that causes the new creation of magnetic bubbles is
Same as Figure 1.

The other end of the transfer path 1, ie, the tip in the bubble transfer direction, is connected to the storage loop via the write information transfer path. For example, in the case of a major/minor loop configuration, it is connected to the minor loop via the major loop. A transfer gate T is formed in the middle of the transfer path 1. Reference numeral 3 denotes a control conductor pattern constituting a transfer gate, one end of which overlaps another transfer path 4.

Further, the control conductor pattern 2 and the control conductor pattern 3 are connected in series so that the directions of the magnetic fields generated by the current 1 are opposite to each other.

Further, the permalloy pattern 11 that constitutes the generator G and the permalloy pattern 11 that constitutes the transfer gate T are arranged so that their positions with respect to the direction of the rotating magnetic field HR differ by 180 degrees.

The transfer path 4 also consists of a rigid transfer pattern 11...
Its tip is connected to a guardrail (not shown).

When a predetermined control signal (current 1) flows through the transfer gate T, the magnetic bubble B on the pattern 11' in the transfer path 1
7 is pulled by the control conductor pattern 3 and transferred to the transfer path 4. In operation, generator G generates magnetic bubbles continuously for each bit, unlike the conventional ones, and the bits are sequentially transferred as B1, B2, . . . by a rotating magnetic field.

In this case, since the control conductor patterns 2 and 3 are connected in series, the timing at which the current 1 flows through these control conductor patterns 2 and 3 is set twice in one cycle of the rotating magnetic field HR. In other words, the direction of the rotating magnetic field is 0 degrees (downward in the figure) and 180 degrees.
The timing at which the current 1 is applied is when the current 1 is at a certain angle (in the upward direction in the figure). However, the arrangement of the permalloy patterns of the generator G and the transfer gate T is 180 degrees different, and the local magnetic field generated by the current 1 flowing when the direction of the rotating magnetic field HR is 0 degrees acts only on the generator G, and the rotating magnetic field HR direction is 1
The local magnetic field generated by the current 1 flowing at 80 degrees acts only on the transfer gate T.

In addition, since the generator G generates bubbles continuously for each bit, when the direction of the rotating magnetic field HR is 0 degrees, a current i is passed each time, but when the direction of the rotating magnetic field HR is 180 degrees, As will be described later, a current i is applied depending on whether or not to send out a bubble.

When the current i flows in the transfer gate T, the magnetic bubble BT on the transfer pattern 11' is transferred to the transfer path 4 on the guardrail side, and the rotating magnetic field causes the magnetic bubble BT to be transferred to the transfer path 4 on the guardrail side.
・Transferred like BIO and sent to guardrail.
The current i is applied only when an unnecessary bubble that does not constitute write information comes to the transfer gate position. For this reason, unnecessary bubbles are discarded to the guardrail like B8/BIO, and only necessary information bubbles are discarded to B9/Bll.
The data is transferred on the write information transfer path 5 as shown in FIG. 5 and sent to the storage loop. Therefore, according to this configuration, the bubble generator G generates a bubble every bit, supplies all bubbles to the transfer path pattern between the generator G and the transfer gate T, and removes unnecessary bubbles from the bubbles. and write only the necessary information bubbles.

Therefore, even if unnecessary bubbles are generated in the generator G, there is no empty pattern near the generator, and there is no room for unnecessary bubbles to invade. Furthermore, since there is no possibility that the influence of unnecessary bubbles will reach the vicinity of the transfer gate section which performs the switching action, there will be no write malfunctions, and reliability will be significantly improved. In particular, this eliminates malfunctions at low temperatures and low bias.
As shown by the chain lines in FIGS. 2 and 3, the lower limit of the bias magnetic field margin is lowered, and the upper limit of the generator current value on the high temperature side of the chip is raised, thereby expanding the operating margin. FIG. 5 shows a second embodiment of the present invention in which a divider is provided in place of the transfer gate of FIG.

R indicates a divider. 6 shows the control conductor pattern of the divider R, and everything else is the same as in FIG. It is almost the same as Figure 4. The operation of divider R will therefore be explained below.

When current i flows in divider R, transfer pattern 11
'The magnetic bubble BT on the top is divided and one side is transferred to the write information transfer path 5 like B9・BIO by the rotating magnetic field, and the other side is sent like B9・BIO to the transfer path 4 on the guardrail side. .

And the current i is the necessary bubble that becomes the write information,
Power is applied only when the divider reaches the R position. For this reason, only the necessary information bubbles are transferred on the transfer path 5 like B9 and Bll, and sent to the storage loop via the write information transfer path. Note that when the current i is not applied, all bubbles are sent to the transfer path 4.

FIG. 6 shows a third embodiment of the present invention in which an annihilator is provided in place of the transfer gate shown in FIG.

A indicates the annihilator, and 7 indicates the control conductor pattern of the annihilator A. Other than that, everything else is the same as in Fig. 4. Also, the operation of the generator G, the current i, etc. to be passed through the control conductor pattern, etc., and the timing of passing the current. It is almost the same as Fig. 4, except that it is slightly different. Therefore, the operation of the annihilator A will be explained below.

When a current i flows through the control conductor pattern T of the extinguisher A, the magnetic bubble BT on the transfer pattern 11' is extinguished,
It is not transferred to the write information transfer path 5.

Furthermore, when the magnetic bubble reaches the transfer pattern 11', if the current i is not applied to the control conductor pattern T, the magnetic bubble is transferred to the write information transfer path 5 as B9.Bll by the rotating magnetic field HRVC. As described above, in the present invention, the temperature characteristics are improved by continuously generating bubbles in the generator, and even though the number of control circuits such as a divider is increased. By connecting the control conductor patterns in series, the increase in the number of terminals can be suppressed. The chip size can also be reduced to the conventional size.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the pattern of a conventional magnetic bubble generator;
FIG. 2 is a graph showing the margin of the bias magnetic field with respect to the rotating magnetic field, and FIG. 3 is a graph showing the margin of the generator current with respect to the magnetic bubble chip temperature.

Claims (1)

[Claims] 1. In a magnetic bubble storage device that generates, divides, extinguishes, and controls the traveling direction of magnetic bubbles using a local magnetic field generated by a control conductor pattern and a rotating magnetic field acting on a permalloy pattern, each period of the rotating magnetic field is controlled by a bubble generating means. The first conductor pattern for controlling the generating means and the second conductor pattern for controlling the means for dividing, extinguishing, or controlling the direction of movement are continuously generated in each of the first conductor patterns. and a second conductor pattern are connected in series so that the directions of local magnetic fields generated by the means are opposite, and the first and second conductor patterns of both means are arranged on the same bubble transfer path, and the transfer path includes: A magnetic bubble storage device characterized in that at least two permalloy patterns whose positions differ by 90 degrees or more with respect to the direction of a rotating magnetic field are arranged to face the first and second conductor patterns, respectively.