JPS5816273B2 - Entoujikuseigiyosouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical magnetic domain control device, and particularly to a current control device for transferring magnetic bubbles between a major loop and a minor loop in a major/minor loop type cylindrical magnetic domain (magnetic bubble) file memory. The present invention relates to a cylindrical magnetic domain side control device applied to type transfer gates.

As is well known, magnetic bubbles have been actively put into practical use as large-capacity memories in recent years.

In addition to the major/minor loop method mentioned above, on-chip decoding methods, dynamic ordering methods, and the like have been proposed to date to create this memory.

The major/minor loop system to which the present invention is applied has a configuration in which multiple minor loops are arranged in parallel for one major loop. Access time can be much shorter.

This major/minor loop method will be described later, but there is a major loop that circulates magnetic bubbles along a T-I pattern made of magnetic material under a rotating magnetic field, and a similar loop that stores information to be memorized. It is composed of a plurality of minor loops having a T/■ pattern and a transfer gate that transfers magnetic bubbles between these minor loops and the major loop.

This transfer gate already has a $ sign type gate, and the applicant has developed a chevron gate or a modified H
Form dates, etc. have also been proposed.

However, in any of these transfer gates, it is not possible to read out two (or three) or more magnetic bubbles in succession within the transfer gate, so one T-1 pattern in the major loop is read out as one pit. Therefore, a magnetic bubble could only exist in one out of every two pits.

Of course, two (or three) consecutive transfer gates are connected to the transfer gate.
By sending out the magnetic bubble of (i), it is possible to make one magnetic bubble exist per one bit.

However, in practice, there is a problem in that the operating margin of the magnetic bubble becomes small and the operation becomes extremely unstable.

As a result, in the conventional transferate structure, the major loop can only have a bit density of 1 magnetic bubble per 2 bits, so for example, if the rotating magnetic field is 10
Even if the transfer gate rotates at 0 cycles, the sensor has the disadvantage that it can only be read at a speed of 50 cycles.
1 (or 3) magnetic bubbles can be made to exist in succession, thereby making it possible to make it possible to make 1 magnetic bubble exist per 1 bit in the major loop.

The purpose of this invention is to propose a magnetic bubble control device for transfer gate.

However, in this case, it is necessary to configure one word with two (or three) consecutive addresses in the minor loop.

In accordance with the above object, the present invention is characterized in that a transfer gate formed by connecting at least two modified H-shaped patterns in series is provided between a major loop and a minor loop.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic diagram for outlining a major/minor loop type magnetic bubble memory.

To write information, first, the magnetic bubble that is constantly generated from the magnetic bubble generator G is placed on the major loop M by opening the write data (D-G) according to the information, and then moved to the minor loop. loop m1
, m2, . . . mn.

And each transfer gate T-G, , T-G
2...Open T-Gn all at once and put magnetic bubbles into each minor loop.

At this point, the information is stored in parallel and the writing of the information is completed.

On the other hand, to read information, the desired information is moved in parallel to the transfer gates T-G□, T-G2,
...Take it to T-Gn, open it all at once, place it on top of the major loop M, and move it further.

The magnetic bubble moving in series on this major loop M reaches the sensor S and obtains desired information P.

Once the information has been read, it is returned to the original address within the minor loop.

Unnecessary information enters the open erase gate E-G and is erased by the bubble eraser Xe.

Also, X in the figure is a bubble eliminator. If such a major/minor loop method is used, the average access time can be made much shorter, as already mentioned.

The entire component shown in Figure 1 is placed under a rotating magnetic field that rotates counterclockwise (or vice versa), and this rotating magnetic field causes the magnetic bubbles to move in a constant direction on the major and minor loops and in accordance with the rotation cycle. Move in sync.

And the magnetic bubble, transfer game)T-G1゜)
T-G2......From major loop M through T-Gn to minor loop m□, m2...mo (
or vice versa), conductor pattern T-C wired via each transfer gate (T-G).
This is done by selectively applying current pulses from the current source T.

This means that write gate DG and erase gate)B-
The same applies to the case where G is opened and closed.

The present invention is particularly applicable to the transfer gate (T-
This relates to the structure of G).

Conventionally, this transfer gate has been
There are sine-shaped, modified H-shaped, etc., but the basic principles are similar in all of them, so the structure and operation of the latter modified H-shaped transfer gate will be explained with reference to FIG.

In Fig. 2, 1 is a magnetic thin film with axial anisotropy, 2
-1 and 2-2 are T-patterns and bar patterns made of a magnetic material represented by permalloy, respectively, which constitute a major loop M; 3 is a permalloy pattern, which constitutes a minor loop m; 4-1 is a permalloy A pair of modified H-shaped patterns 4-2 are bar patterns connecting the pair of modified H-shaped patterns 4-1, and these 4
-1 and 4-2 form the main part of transfer gate TG.

5 is a conductor pattern (TC in FIG. 1).

Further, the broken line in the figure is the propagation path of the magnetic bubble, and the upper broken line is the major loop amount 1, and the lower broken line is the minor loop m.

However, it is assumed that the rotating direction of the rotating magnetic field HD is clockwise as shown in the figure.

This HD rotates in one direction, and the path of the magnetic bubble is switched by applying a current pulse of positive polarity (or negative polarity) to the particle pattern 5.

The direction of movement of the magnetic bubble is from right to left in the figure in the major loop M, or clockwise in the minor loop m.

When the magnetic bubble comes to point a on major loop M,
A current pulse is applied to the conductor pattern 5 to generate a repelling magnetic field at point e' and an attractive magnetic field at point b against the magnetic bubble.

Due to the generation of this attractive and repulsive magnetic field, the magnetic bubble, which should originally move from point a to point e', moves from point a to point b.

After this, as the direction of the rotating magnetic field HD changes from ■→Q→■, the magnetic bubble moves to point C, point d, and point e, and as a result, the magnetic bubble becomes B −+ bb C→d−+e. and is transferred from major loop M to minor loop m.

In this case, the current pulse width applied to the conductor pattern 5 may be approximately 1/4 cycle of the rotating magnetic field HD.

On the other hand, for the transfer from the minor loop m to the major loop M, when the magnetic bubble reaches point a', a current pulse is applied to the conductor pattern 5 so that it is repelled to the point e side and an attractive magnetic field is generated to the point b' side. If it is allowed to flow, the magnetic bubble will not move to point e, where it should originally go, but move to point b' l.

As a result, the magnetic bubble is a'→b'→C'→d'→e'
and move sequentially from minor loop M to major loop M.
1 Now, if we follow the movement of the magnetic bubble, we can see that the rotating magnetic field HD is in the direction of ■, the magnetic bubble is in the position of I, and the magnetic field HD is as follows: .

When it rotates once, the magnetic bubble...→■→IT-7I-I
'(7) Come to position.

At this time, one minor loop m before this magnetic bubble
The magnetic bubble exiting the magnetic field changes I'→...'
→■'→■'→I' comes to the device.

However, in practice, the magnetic bubble does not always follow the above-mentioned route without error, and there is a problem that the operating margin is low.

This is because a certain magnetic bubble from the minor loop
The magnetic bubble moves stably in the attractive magnetic field formed by the conductor pattern 5 and the current pulse applied to it. Looking at the magnetic bubble that exited the minor loop m before (equivalent to one cycle of
This is because, due to the conductor pattern 5, particularly the conductor pattern 5', and the current pulse flowing therethrough, the magnetic bubbles emitted at the tip must be directed from the attractive magnetic field region to the repellent magnetic field region.

In this repelling magnetic field region, the magnetic bubble may be prevented from moving or may be made to disappear, resulting in extremely unstable operation and a reduced operating margin.

As a result, the magnetic bubble that exited the minor loop m first becomes
It must not be affected by the current pulse applied to switch the path of the magnetic bubble that comes out later.
Therefore, it is necessary to provide an interval of one magnetic bubble for every two bits, which results in the aforementioned drop in pit density.

Therefore, the present invention provides a major loop M and a minor loop m.
During this period, a transfer gate and a conductor pattern as shown in FIG. 3 were constructed.

The basic idea is that multiple magnetic bubbles sent out at a rate of 1: bit 1 magnetic bubble from the minor loop m run together through the transfer gate under a stable attractive magnetic field, and these magnetic bubbles pass from the transfer gate to the major loop. At the time of MK transition, this transition is performed only by the normal rotating magnetic field HD, and the magnetic bubble is prevented from moving at least toward the repelling magnetic field.

In Figure 3, reference numbers (symbols) 1.2-1 and 2
~2, 3 and m and M are the same as in FIG. The gate is configured.

The direction of the rotating magnetic field can be either direction, but if a counterclockwise rotating magnetic field H'D is applied as shown in the figure, the magnetic field H'D is in the direction of ■' and the magnetic bubble is at the position of I. By applying a current pulse to the conductor pattern 14, it is attracted to the position (■), and by the rotating magnetic field H/
The magnetophobic bubble is moved to the V position.

At this time, the magnetic bubble that has already left the minor loop m one bit before comes from the position I' to the position ■'→■'→■'.

During this time, in order to guide the magnetic bubble described later as I→■,
A current pulse is applied to the conductive pattern 14, but the magnetic bubble that had exited the minor loop m one bit before is subjected to an attractive magnetic field by the current pulse at the position l/→...', and no repelling magnetic field occurs. No movement towards is required.

Moreover, since it receives an attractive magnetic field, the magnetic bubble itself is stable.

When the magnetic bubble that had exited the minor loop m one bit before and the subsequent magnetic bubble move to the major loop M, the transition is performed by the normal rotating magnetic field HID, so the magnetic bubble changes from the attractive magnetic field to the repulsive magnetic field. There can be no need to migrate.

As a result, when transferring the magnetic bubbles from the minor loop m to the major loop M, the nitric bubbles can be transferred continuously and stably at a rate of 1 magnetic bubble per 1 bit.

As explained above, according to the present invention, it is possible to place a magnetic bubble on the major loop M with a pit density of one magnetic bubble per bit, which was previously considered extremely difficult, and the information transmission density is dramatically increased. increases to

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating a magnetic bubble memory based on the major/minor loop method, FIG. 2 is a plan view showing a conventional transfer gate, and FIG. 3 is a plan view showing a transfer gate based on the present invention. In the figure, 1 is a uniaxially anisotropic magnetic thin film, 2-1.2
-2.3 and 4 are permalloy patterns, 11, 12 and 13 are permalloy patterns according to the present invention, 14 is a conductor pattern according to the present invention, m is a minor loop, M is a major loop, T-G is a transfer gate, HD and H / is the rotating magnetic field.

Claims (1)

[Claims] 1. In a major/minor loop type cylindrical magnetic domain side four-control device, a transfer gate disposed between a major loop and a minor loop is a transfer gate made of a magnetic material pattern that transfers a cylindrical magnetic domain by a rotating magnetic field. A major loop and a minor loop are formed in the cylindrical magnetic domain using means and the action of the magnetic field generated by energization. - a conductor pattern for controlling transfer between loops, the transfer means is composed of a magnetic pattern sufficient to hold at least two cylindrical magnetic domains, and the conductor pattern is normally connected to the transfer means; A cylindrical magnetic domain control device characterized in that the cylindrical magnetic domain control device is arranged so as to commonly apply an attractive magnetic field to positions where at least 2J cylindrical magnetic domains can exist on a magnetic material pattern.