JPS5847790B2 - Magnetic bubble information writing 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 realizes a device that can accurately write nucleated magnetic bubbles. It is something to do.

Magnetic bubble memory 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 magnetic bubbles, and sends magnetic bubbles into it to generate information. It is something to remember.

To transfer magnetic bubbles, a permalloy transfer pattern such as T-bar, chevron, Y-Y, half disk, etc. is formed on a magnetic thin plate such as magnetic garnet, and the bubble is placed under a static magnetic field perpendicular to the magnetic thin plate. , a rotating magnetic field parallel to the plane of the magnetic thin plate is applied to magnetize and transfer the transfer pattern.

On the other hand, there are two ways to generate bubble magnetic domains: one is to split the seed bubble, and the other is to create new bubbles.
The present invention is directed to the latter method in which bubbles are generated and written using a nucleation type generator.

However, with the NuCreation type generator, there is a risk of malfunction due to stray bubbles, which hinders the reliability of information writing.

Fig. 1 shows a conventional nucleation type generator, in which a hairpin-shaped conductor pattern 2 is formed in a certain magnetic bubble transfer path 1 from a deformed nozzle disk-shaped pattern 11 made of permalloy or the like. 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 conductor loop 2
A bubble magnetic domain B1 is generated within the magnetic field.

The generated magnetic bubble moves in the direction of the arrow (
(to the left in the figure) as B2...

In this way, under the action of the bias magnetic field and the rotating magnetic field HR, the generator current i to the conductor pattern 2 is turned l-ON in response to the information "1" and "O".
j. By turning it "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 unnecessary bubbles are generated in the conductor loop 2, and these bubbles repel each other and enter empty positions in the transfer path, causing write malfunctions.

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 HB with respect 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, as shown by the chain line, for example. With the goal.

In order to achieve this purpose, the present invention has a generator dedicated to generating magnetic bubbles to continuously generate every bit, and a gate signal between the generator and the write information transfer path to eliminate necessary information bubbles and unnecessary information bubbles. The bubbles are sorted out, and unnecessary bubbles are transferred to the guardrail where they disappear.

Next, details of the present invention will be explained based on illustrated embodiments.

FIG. 4 shows the first embodiment. A hairpin pattern 2 for generating bubbles is provided at one end of a certain transfer path 1 from a row of transfer patterns 11..., and the point that magnetic bubbles are nucleated within the loop of this conductor is the same as in Fig. 1. It is.

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.

In the middle of the transfer path 1, a switch circuit 3 such as a transfer gate is formed.

Reference numeral 31 denotes a hairpin-shaped conductor loop constituting a transfer gate, one end 32 of which overlaps another transfer path 4 .

The transfer path 4 is also cut out from the row of transfer patterns 41, and its tip is connected to a guardrail (not shown).

When a gate pulse signal flows through the transfer gate 3, the magnetic bubble B7 on the pattern 11' in the transfer path 1
It is pulled by the conductor loop 31 and transferred to the transfer path 4.

To explain the operation, generator 2 generates magnetic bubbles continuously for each bit, unlike conventional ones, and uses a rotating magnetic field to generate B1
・B2... are transferred sequentially.

Therefore, transfer pattern 1 on transfer gate 3
Up to 1', all patterns 11... and B1...
A bubble is retained as shown in B.

When the gate signal flows in the transfer gate 3,
The magnetic bubble B7 on the transfer pattern 11' is transferred to the transfer path 4 on the guardrail side, transferred like B8.13to by the rotating magnetic field, and sent to the guardrail.

The gate signal is energized only when an unnecessary bubble that does not constitute write information comes to the transfer gate position.

Therefore, unnecessary bubbles are discarded to the guardrail like B8・13to, and only necessary information bubbles are B,・B1
1, the information is transferred on the transfer path 1 and sent to the storage loop via the write information transfer path.

Therefore, according to this structure, strictly speaking, the bubble generator and the writing section are separate, and the bubble generator 2 generates a bubble every bit, and the transfer path pattern between the generator 2 and the transfer gate 3 is All bubbles are supplied, unnecessary bubbles are removed from these, and only necessary information bubbles are written.

Therefore, even if unnecessary bubbles are generated in the generator 2, there is no empty pattern near the generator, and there is no room for unnecessary bubbles to enter.

Moreover, since there is no possibility that the influence of unnecessary bubbles will reach the vicinity of the transfer gate section that performs the switching function, there is no possibility of write malfunctions, and reliability is significantly improved.

In particular, this eliminates malfunctions on the low-temperature, low-bias side, lowering the lower limit of the bias magnetic field margin and lowering the generator current on the high-temperature side of the chip, as shown by the chain lines in Figures 2 and 3. The upper limit of the value will be raised, and the operating margin will be expanded.

FIG. 5 shows a second embodiment of the present invention, but contrary to the previous embodiment, the tip of the transfer path 1 is connected to a guardrail, and the transfer path 4 on the transfer gate 3 side is a write information transfer path and is a storage loop. connected to.

Therefore, when a gate pulse enters the transfer gate, the necessary bubble that becomes write information is transferred to the transfer path 4.
Other bubbles are transferred to the guardrail as unnecessary bubbles and disappear.

In the illustrated example, a transfer gate is used as a switching means for separating write information bubbles from unnecessary bubbles, but other types of gates may be used, and the transfer pattern may be other than half-day.

[Brief explanation of drawings]

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. FIG. 4 is a diagram illustrating a pattern of the magnetic bubble information writing device according to the present invention, and FIG. 5 is a diagram of a pattern according to another example. In the figure, 1 and 4 are transfer paths, 11...11', 41
... is a transfer pattern, 2 is a magnetic bubble generator, and 3 is a transfer gate.

Claims (1)

[Claims] 1 A bubble generator that successively generates bubbles every cycle in synchronization with a rotating magnetic field, and a bubble generator that continuously generates bubbles between the bubble generator and a write information transfer path, and distinguishes the continuously arriving bubbles from necessary information bubbles and unnecessary information bubbles. 1. A magnetic bubble information writing device comprising: a switch means for sorting out unnecessary bubbles; and a transfer path between the switch means and a guardrail for guiding unnecessary bubbles to the guardrail.