JPS6038793B2 - Contiguous disk type magnetic bubble element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contiguous disk type magnetic bubble element.

In storage devices that use magnetic bubbles (hereinafter simply referred to as bubbles) as information carriers, baffle transfer has conventionally been carried out by in-plane rotation in which a pattern made of a European magnetic film such as Permalloy (hereinafter referred to as Permalloy pattern) is externally applied. This is done by attracting bubbles to magnetic poles generated by magnetization by a magnetic field (conventional magnetic bubble devices that transfer bubbles using such permalloy patterns are hereinafter referred to as conventional magnetic bubble devices).

However, the above-mentioned permalloy patterns must be formed with very narrow gaps between them, and the formation of these gaps becomes a limit in microfabrication and prevents an increase in storage density. Furthermore, the gaps between the permalloy patterns exert a magnetic force on the bubbles being transferred, which is inconvenient for high-speed bubble transfer. In order to overcome the drawbacks of such conventional magnetic bubble elements, in US Pat. No. 3,828,32,
A new type of magnetic bubble device called a contiguous disk type magnetic bubble device has been proposed, which transfers bubbles along a transfer pattern consisting of non-implanted regions formed by selectively implanting ions onto a magnetic thin film. ing.

In the conditional disk type magnetic bubble element,
In order to access bubbles efficiently, it is absolutely necessary to implement a major manner configuration such as that already adopted in the conventional magnetic bubble element. One of the essential functional elements in a magnetic bubble element with a major/minor configuration is a function (transfer in) of transferring the bubble in the major transfer path to the minor loop with good controllability. The element that performs this function is usually called a transfer-in gate. Prior to explaining the present invention, the features and disadvantages of the conventional transfer-in gate will be explained with reference to the drawings.

Figure 1 was published in the Journal of Applied Physics in March 1981 by R. Wolfe et al.
Physics) Magazine No. 52, No. 3, pp. 2377-2
This is an example of transfer-in-gate shown in the paper published on page 379.

Reference numerals 1 and 2 indicate a first transfer pattern and a second transfer pattern, each consisting of a non-injected region formed on a magnetic thin film whose film surface is a (111) plane of a cubic magnetic material capable of retaining bubbles.
This is the transfer pattern. The same numeral 6 is a conductive pattern, and the same numerals 18 and 19 are a first edge and a second edge of the conductive pattern 6, respectively. Arrow 15 represents the direction of the bias magnetic field. The arrow 14 indicates the direction from the closest point 3 (from the first transfer pattern side) to the closest point 4 (from the second transfer pattern side) between the first transfer pattern and the second transfer pattern, and the arrow 13 indicates the direction from the nearest point 3 (from the first transfer pattern side) to 4 (the second transfer pattern side). Practical pattern arrangement direction [011] direction)
It represents. The same number 5 is the direction of arrow 13 and arrow 14
represents the angle formed with the direction of The first transfer pattern and the second transfer pattern are formed so that the angle 5 is approximately 1200 degrees. The transfer path consisting of the edge part on the [211] side of the first transfer pattern formed linearly in the [011] direction is generally called a super transfer path.
It is already known that the best transfer properties are obtained. The second one formed in the [211) direction indicated by the arrow 16
It is already known that average transfer characteristics are obtained at both edges in the longitudinal direction of the transfer pattern, and such a transfer path is generally called a good transfer path. [
Since a magnetic thin film with the film plane as the [111] plane has three-fold magnetic in-plane symmetry, the [112] side edge portion of the transfer pattern formed in the (110] direction and the [101] The edges of the transfer patterns formed in the [121] direction are all called super transfer paths.For the same reason, the longitudinal edges of the transfer patterns formed in the [112] and [121] directions are called super transfer paths. The edge portions on both sides are all called good transfer paths.Hereinafter, along the edge portion on the super transfer path side of the first transfer pattern, which will be explained in one of these three equivalent directions as a representative. When the bubble being transferred is at position 9, applying a current pulse in the direction of arrow 17 to the conductor pattern 6 induces a magnetic field distribution such that the vicinity of the second edge 19 becomes a valley of magnetic potential. The location 1011' is transferred.

Thereafter, the in-plane rotating magnetic field sequentially transfers the light to positions 11 and 12, thereby realizing a transfer-in operation. However, when using a conventional transfer-in gate and performing a transfer-in operation based on the principle described above, the valley of the magnetic potential caused by the current pulse 17 is located at the second edge of the conductor pattern. It has a uniform depth along.

Therefore, the valve that should originally be transferred in from position 9 to position 10 is attracted to the charge dual generated at position 100 or 101, and is transferred to the adjacent first valve.
This has the disadvantage that malfunctions such as data being transferred to the same transfer pattern are very likely to occur. SUMMARY OF THE INVENTION An object of the present invention is to provide a contiguous disk type magnetic bubble element having a transfer-in gate that can perform a bubble transfer operation very stably and reliably.

Next, the principle of the present invention will be explained based on examples.

FIG. 2 is a diagram showing a first embodiment of the present invention. In FIG. 2, the reference numeral 25 indicates notches provided periodically on the second edge of the conductor pattern 6, and the same numerals 9, 10, 11.
and 12 is the transfer position of the bubble during the transfer-in operation. When a current bubble is applied to the conductor pattern 6 in the direction of arrow 17 when the bubble reaches position 9, the bubble moves in the direction of arrow 2 due to the magnetic field gradient exceeded by the current pulse.
Receives driving force in direction 7. On the other hand, since the current density is disturbed near the notch provided on the second edge, a local magnetic field distribution occurs such that the position 26 becomes a magnetic potential valley. Therefore, as the bubble approaches the bubble position 26 driven in the direction of the arrow 9 from the position 27, the driving force toward the layer 26 becomes stronger. Therefore, the bubble was stably transferred from position 9 toward position 10 due to the magnetic field gradient induced by the current pulse and the charged wall of the first transfer pattern. FIG. 3 shows an example of the phase and pulse width of the current pulse applied to the conductor pattern. In FIG. 3, the arrangement direction (011 direction) of the first transfer pattern is taken as the 1800 direction of the rotating magnetic field. Arrows 30 and 31 indicate the start and stop phases of the current pulse, respectively, and arrow 32 indicates the application phase range of the current pulse. According to the principle of the present invention as described above, the bubble transfer-in operation can be realized very stably and reliably.

The conditional disk type magnetic bubble element of the present invention is made of a cubic magnetic material (11
1) By selectively implanting ions into a magnetic thin film whose surface is the film surface, ions are periodically and linearly arranged with gaps in the [011], [101], or [110] directions. A spur transfer path side edge portion of a first transfer pattern consisting of a non-implanted region having a plurality of convex portions is used as a major transfer path, and a convex portion of the first transfer pattern located on the opposite side of the major transfer path. The major-minor method uses the edge part of the second transfer pattern consisting of a bead-shaped non-injected region formed in the direction of the good transfer path through a gap having a predetermined interval as a minor loop transfer path. In the magnetic bubble element, a substantially band-shaped conductor pattern is provided along the first transfer pattern, and a first edge of two edges on both sides of the conductor pattern is near the major transfer path. , the second edge intersects the first transfer path at a location other than the major transfer path, and the second edge has cuts at a period equal to the arrangement period of the first transfer pattern. It is formed.

FIG. 4 shows a second embodiment of the present invention in which a notch 35 is also provided on the first edge 18 of the conductive pattern 30. As shown in FIG.

The disturbance in the current distribution near the notch 35 causes a magnetic field distribution such that the position 36 is a peak of the body shape. Therefore, the magnetic field gradient directed from position 9 to position 101 is stronger than in the first embodiment, and a more stable transfer-in operation can be realized. FIG. 5 shows a third embodiment of the present invention in which the notch 25 of the conductor pattern 40 is provided in the convex portion of the first transfer pattern.

FIGS. 6 and 7 show fourth and fifth embodiments of the present invention, respectively, in which the shape of the first transfer pattern is changed.

Reference numerals 50 and 60 are the same as the conductor patterns 80 and 9, which are the first transfer patterns. As described above, by using the present invention, the transfer-in operation of the valve can be performed very stably and reliably.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a transfer gate. 1 is the first transfer pattern, 2 is the second transfer pattern, 3, 4
is the closest point between the first transfer pattern and the second transfer pattern,
14 is an arrow indicating the direction of a straight line drawn from the nearest point 3 to the nearest point 4, 13 is an arrow indicating the substantial arrangement direction of the first transfer pattern, and 5 is 2 indicated by arrows 13 and 14. The angle formed by the two directions, 16, is [211
] An arrow indicating the direction, 6 a conductor pattern, 18 and 19 the first and second edges of the conductor pattern 6, respectively, 17 the first and second edges of the current pattern 6 applied to the conductor pattern, 1
7 is an arrow indicating the direction of the current pulse applied to the conductor pattern; 9, 10, 11, 12 are bubble transfer positions; 100,
Reference numeral 101 indicates the position of the bubble that caused the transfer error, and reference numeral 15 indicates the direction of the bias magnetic field. FIGS. 2 and 3 are diagrams showing a first embodiment of the present invention. 2 river conductor patterns, 25 a notch provided on the second edge 19, 26 the position of the valley of magnetic potential, 27 an arrow indicating the direction of the driving force received by the bubble, 3
0 and 31 are arrows indicating the start and stop phases of the current pulse, respectively, and 32 is the application phase range of the current pulse. FIGS. 4 to 7 are diagrams showing second to fifth embodiments of the present invention, respectively. 80 and 90 are the first transfer patterns, 30
, 40, 50, 60. 80,9 river first transfer pattern, 30,40,50,6
In the river conductor pattern, 35 is a notch provided on the first edge 18, and 36 is the position of a peak of magnetic potential. 2 figures of spears, 2 figures of spears, 4 figures of O S figures, 6 figures of O 7 figures

Claims (1)

[Claims] 1. Magnetic, cubic magnetic material capable of holding bubbles (
By selectively implanting ions onto a magnetic thin film with the 111) plane as the film surface, [011], [101], [[1
10] The super transfer path side edge portion of the first transfer pattern consisting of a non-implanted region having a plurality of convex portions arranged periodically and linearly with gaps in either direction is used as a major transfer path. , consisting of a silica bead-shaped non-implanted region formed in the direction of the medium transfer path through a gap having a predetermined distance from the convex portion of the first transfer pattern located on the opposite side of the medium transfer path. In a major-minor type magnetic valve element that uses an edge portion of a second transfer pattern as a minor loop transfer path, a substantially band-shaped conductor pattern provided along the first transfer pattern; Of the two edges on both sides of the pattern, the first edge is located near the major transfer path, and the second edge is located at a location other than the major transfer path.
The second edge intersects with the transfer path of the first edge.
1. A contiguous disk type magnetic bubble element, characterized in that the notches are formed at a period equal to the arrangement period of the transfer pattern.