JPS6250918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bubble domain transfer pattern of a current-driven magnetic bubble element. More specifically, the present invention relates to a bubble domain transfer pattern using a perforated two-layer conductor.

on a bubble material flake capable of retaining bubble magnetic domains;
Two layers of perforated conductor patterns are stacked on top of each other, and each layer has a phase difference.
A current access type dual conductor pattern device (hereinafter referred to as DCP device) that drives a bubble magnetic domain by a substantially traveling wave bias magnetic field generated around a hole pattern through an alternating current shifted by 90 degrees is A. 1979 by H. Bovetzk et al.
The Bell System Technical Journal
Since it was first published in Volume 58, No. 6, pages 1453 to 1540, there has been a great deal of interest due to the high speed of bubble drive, low power consumption not found in conventional current access methods, and adaptability to microbubbles. It has been paid.

In that document, bubble domain information is stored in a minor loop with a bubble domain transfer direction perpendicular to the bubble driving current direction, while writing or reading of bubble domain information is carried out in a bubble parallel to the bubble domain driving current direction. There is a description of a memory organization that is performed through a major loop with a magnetic domain transfer direction. Furthermore, the same document shows an example of a transfer pattern having a bubble domain transfer direction parallel to the bubble domain driving current direction. However, it is clear that by using the transfer pattern described in the same document, bubble transfer is only performed in one direction with a constant current application sequence. It is extremely difficult to provide parallel transfer patterns.

An object of the present invention is to provide a transfer pattern for a DCP device that can easily form a loop-shaped transfer path parallel to the bubble domain drive current direction.

The present invention will be explained in detail below using the drawings.
Figure 1 shows the conventional method that realizes the bubble domain transfer direction parallel to the current direction, which is described in the above-mentioned literature.
This is the transfer pattern of the DCP device. A current indicated by an arrow 31 is applied to the first conductor layer 1 for driving the bubble magnetic domain.
Hole pattern 11,1 with longitudinal direction perpendicular to _J1 direction
2nd class is provided. The second conductor layer 2 for driving bubbles is provided with hole patterns 21, 13 and the like having a longitudinal direction perpendicular to the direction of current _J2 as indicated by an arrow 32.

The currents J ₁ and J ₂ are a→b→c→d→a→b→c
→ When the currents are applied to the first and second conductor layers in the order as shown in d, the bubble magnetic domain whose stable position is the position indicated by a ₀ of the pattern 11 in the current direction a becomes a according to the order in which the currents J ₁ and J ₂ are applied. Shift its stable position along the path ₀ →b ₀ →c ₀ →d ₀ →a ₁ →b ₁ →c ₁ →d ₁ . That is, the direction of transfer of the bubble domain is the direction shown by arrow 4, which is also equal to the current application directions 31 and 32. In this conventional transfer pattern, if the order of applied current is constant, the bubble domain transfer direction is also unidirectional. In order to form a loop or a reciprocating transfer path using this conventional transfer pattern, a width twice or more of the pattern width shown in W is required, which has the drawback of too much wasted space.

By using the present invention, these drawbacks can be eliminated.
DCP devices are easily realized.

The transfer pattern of the DCP device transfer path according to the present invention is characterized in that the longitudinal direction of at least a part of the hole pattern of the first conductor is slightly inclined from perpendicular to the applied current direction, and the hole pattern of the second conductor has the above-mentioned inclined direction. The longitudinal direction of the hole patterns existing at the position corresponding to the hole pattern is inclined in the opposite direction to the hole pattern, and they intersect with each other.

Next, a first embodiment of the present invention will be described using FIG. 2. A feature of the present invention is that the first conductor layer hole pattern 12, the second conductor layer hole pattern 12, and the second conductor layer hole pattern 22 intersect with each other. Hole patterns 11 and 21 whose longitudinal direction is perpendicular to the applied current direction 31 or 32 are provided near the top of these hole patterns 12 and 22, and similar hole patterns 13 and 23 are provided near the bottom. current
When the direction of application of J ₁ is a, the bubble magnetic domain where the a ₁ part of the hole pattern 11 is at a stable position is the applied current order a→b.
→c→d→a→b→c→d according to a ₁ →b ₁ →c ₁ →
The data is transferred as d ₁ →a ₀ →b ₀ →c ₀ →d ₀ , and a transfer path in the direction shown by arrow 41 is formed above the intersecting patterns 12 and 22. At the bottom of the crossing patterns 12 and 22, a ₂ → b ₂ → c ₂ → d ₂ → a ₃ →
A transfer path in the opposite direction indicated by the arrow 42 of b ₃ →c ₃ →d ₃ is formed. As described above, when the present invention is used, the reciprocating transfer path is formed above and below the intersecting pair of hole patterns, so that the space occupied by the reciprocating transfer path can be significantly saved compared to the conventional method.

Next, a second embodiment of the present invention will be described with reference to FIG.

In this embodiment, two types of intersecting patterns according to the present invention are provided.

The difference between these types is that the hole patterns 11 and 22 have the same inclination direction, or that the hole patterns 21 and 12 are in different conductor layers. Cross patterns belonging to the same type are lined up in the direction of applied current. In such a configuration, the application order of applied currents J ₁ and J ₂ is a→b→
According to c→d→..., the bubble magnetic domain transfer path a ₀ →b ₀ →c ₀ →d ₀ →... is shown by the arrow 41, and the bubble magnetic domain transfer path a ₁ →b ₁ →c is shown by the arrow 42. ₁ →d ₁ →…
..., bubble magnetic domain transfer path a ₂ → b ₂ indicated by arrow 43
A group of transfer paths arranged so that the transfer directions are alternately reversed as in →c ₂ →d ₂ →... can be easily realized.

FIG. 4 is a diagram illustrating a third embodiment of the present invention. This embodiment is a 180° turnaround transfer path in which a corner portion is provided in the reciprocating transfer path of the first embodiment. A hole pattern 15 of the first conductor layer and a hole pattern 25 of the second conductor layer in a direction perpendicular to the applied current direction are provided at the ends of the array of intersecting hole patterns 12 and 22 so as to partially overlap. According to the application order of applied currents J ₁ and J ₂ a → b → c → d → a → ..., the bubble magnetic domain is transferred perpendicular to the current direction forming a corner from a ₀ → b ₀ → c ₀ → d ₀ . It is transferred as a ₂ → b ₂ → c ₂ → d ₂ via the pattern section as a ₁ → b ₁ → c ₁ → d ₁ .

That is, a 180° turnaround transfer path shown by arrow 4 is obtained. If this embodiment is used, a loop-shaped transfer pattern parallel to the current direction can be immediately realized.

A fourth embodiment of the invention is shown in FIG. A feature of this embodiment is that, in addition to the intersecting patterns 11 and 21 according to the present invention, hole patterns 12 and 22 or 13 and 23, each having a longitudinal direction perpendicular to the direction of applied current, overlap each other. Even if the patterns overlap, the reciprocating transfer paths shown by arrows 41 and 42 are sufficiently formed due to the presence of the intersecting patterns.

Additionally, overlapping patterns have the potential to be used for switching paths as shown in the above-mentioned documents.

FIG. 6 shows a fifth embodiment of the present invention. In this embodiment, the hole pattern 1 of the first conductor layer 1 is formed in the longitudinal direction inclined from the direction perpendicular to the applied current direction 31 or 32.
1 and the hole pattern 21 of the second conductor layer 2 tilted in the opposite direction thereof overlap with each other with one end substantially in common. Further, on the side where the patterns 11 and 21 overlap, the hole pattern 12 of the first conductor layer 1 and the hole pattern 22 of the second conductor layer 2, whose longitudinal direction is perpendicular to the current direction, are separated from each other and tilted. Pattern 11, 21
On the non-overlapping sides of the conductor layers 1 and 2, the patterns 13 and 23 overlap. Even in this configuration, the current application order is a→b→c→d→a→
According to b→..., a ₀ →b ₀ →c ₀ shown by arrow 41,
Transfer path d ₀ → a ₁ → b ₁ and arrow 4 in the opposite direction
Transfer paths a ₂ →b ₂ →c ₂ and d ₂ →a ₃ →b ₃ →... shown in 2 are obtained.

A sixth embodiment of the invention is shown in FIG. This embodiment includes a cut pattern 16 provided at an end substantially parallel to the applied current J ₁ of the first conductor layer 1 and a cut pattern 26 provided at a similar end of the second conductor layer 2. are intersecting patterns 11 and 2 according to the present invention.
1 is used as part of a round-trip transfer path.

The operation of this embodiment is clear from the description of the previous embodiments. By using this embodiment, not only the space for the bubble magnetic domain transfer path can be saved, but also this cut pattern can be used as a bubble magnetic domain transfer section between conductor parts.

As described above, by implementing the present invention, a loop-shaped bubble magnetic domain transfer path parallel to the bubble magnetic domain drive current direction can be easily realized in a DCP device without wasting space.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a transfer path pattern of a known DCP device, FIG. 2 is a first embodiment of the present invention, FIG. 3 is a second embodiment of the present invention, and FIG. 4 is a plan view of the present invention. The third embodiment of the invention is shown in FIG.
FIG. 6 shows the fifth embodiment of the present invention.
FIG. 7 is a plan view showing a sixth embodiment of the present invention. 1 is a first conductor layer, 2 is a second conductor layer, 11,
12, 13, 14, 15, 16 are the first conductor layer 1
Hole pattern in 21, 22, 23, 24, 2
5 and 26 are hole patterns in the second conductor layer 2;
1 and 32 are bubble domain drive current application methods to the first and second conductor layers, 41, 42, and 43 are bubble domain transfer directions, and J ₁ and J ₂ are the first and second conductor layers 1 and 2, respectively. Current applied to layer 2, a, b, c, d are directions of applied current, a ₀ , b ₀ , c ₀ , d ₀ , a ₁ , b ₁ , c ₁ , d ₁ ,
a ₂ , b ₂ , c ₂ , d ₂ , a ₃ , b ₃ , c ₃ , and d ₃ represent stable magnetic bubble positions corresponding to the current direction.

Claims (1)

[Claims] 1. A current access type comprising a magnetic material capable of holding a bubble magnetic domain, first and second conductor layers provided thereon and having a hole pattern, and means for applying a bubble magnetic domain driving current to these conductor layers. In the magnetic bubble element, the longitudinal direction of at least some of the hole patterns provided in the first conductor layer is inclined in a predetermined direction with respect to the direction perpendicular to the direction of application of the bubble domain driving current, and In the hole pattern provided in the conductor layer, the hole pattern at a position corresponding to the tilted hole pattern has its longitudinal direction inclined in the opposite direction to the hole pattern, and these corresponding pairs of hole patterns are mutually connected to one end of the pattern or A current access type bubble magnetic domain transfer path characterized by being arranged so as to intersect in the middle part.