JPS6038796B2 - Contiguous disk type magnetic bubble element - Google Patents

Description

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

A conventional magnetic bubble element (hereinafter referred to as "bubbles") transfers magnetic bubbles (hereinafter simply referred to as bubbles) using a permalloy pattern.
(simply called a conventional magnetic bubble element),
Permalloy patterns must be formed with very narrow gaps in between, and the formation of these gaps becomes a limit in microfabrication and impedes improvement in storage density.

In order to overcome the drawbacks of such conventional magnetic bubble elements, US Pat. No. 38,283 has already been proposed.
In the 2011 specification, a continuous disk type magnetic bubble element is proposed in which bubbles are transferred along a transfer path consisting of a non-implanted region formed by selectively implanting ions into a magnetic thin film. Conventional type magnetic bubble elements were already developed in January 1976.
lEEE Tra order action nonNGgne in January
tics Magazine Vol. MAC-12, No. 6, Pages 614 to 61, Page 1, P. 1. In a paper published by Mr. Bonyhard et al., an element configuration using two minor loop groups, two bubble generators and two bubble detectors connected in series, called the even-odds method, was proposed, and the device configuration was proposed as a memory. It has been shown to be very effective in increasing data rates.

However, in a continuous disk type magnetic bubble element, a specific configuration of the Yihun-odd method has not yet been proposed. The purpose of the present invention is to
An object of the present invention is to provide a continuous disk type magnetic bubble element which employs an odd method and has an extremely high data rate.

The continuous disk type magnetic bubble element of the present invention has a first major transfer path, a second major transfer path, and a second major transfer path formed by selectively implanting ions onto a magnetic thin film capable of holding magnetic bubbles. In an even-odds type contiguous disk type magnetic bubble element having one minor transfer path group and a second minor transfer path group, the first cusp portion on the first major transfer and the second first and second hairpin-shaped conductor patterns electrically connected in series to a second cusp portion on a major transfer path of the first cusp portion;
The angle between the equal dividing line and the bisecting line of the opening angle of the second cusp portion is 900 or more. According to the present invention, the first and second hairpin-shaped hairpins provided in the first cusp portion of the first major transfer path and the second cusp portion of the second major transfer path are electrically connected in series. By applying first and second current pulses having different phases to the conductor pattern, current pulses can be selectively generated in the first major transfer path and the second major transfer path.

Therefore, the bubble generated at the first cusp portion of the first major transfer path by the first current pulse is used as even-side information, and the bubble generated at the second cusp portion of the second major transfer path by the second current pulse is used as even-side information. By using the bubbles generated on the odd side as information on the odd side, it is possible to realize a contiguous disk type magnetic bubble element of the iffn odd type. Next, the basic principle of the present invention will be explained with reference to FIGS. 1a and 1b.

In Figure 1a, reference numeral 8 is a magnetic thin film, numeral 3 is a hairpin-shaped conductor pattern, numeral 1 is a magnetic bubble transfer path formed by selectively implanting ions into the magnetic thin film, and numeral 9 is a magnetic bubble transfer path formed by selectively implanting ions into the magnetic thin film. The arrow representing the direction of the bias magnetic field, the same number 60, is the arrow E representing the [110] direction of the magnetic thin film.
P and the same numeral 18 are arrows representing angles that define the phase of the current pulse. When a current pulse in the direction of the arrow 7 is applied to the hairpin-shaped conductor pattern 3 (hereinafter simply referred to as a conductor pattern), a magnetic bubble 10 is generated at the cusp portion 2 of the magnetic bubble transfer path 1 (hereinafter simply referred to as a transfer path). do. FIG. 1b shows the application phase (DLY) of the current pulse applied to the conductor pattern 3 of the magnetic bubble generator of FIG. 1a.
) is plotted on the horizontal axis 13 and the operating amplitude of the current pulse is plotted on the vertical axis 12. The pulse width of the current pulse is set to 0.3 French S. As is clear from Figure 1b, Figure 1a
In order to generate bubbles using a magnetic bubble generator, it is necessary to apply a current pulse when the rotating magnetic field is oriented within the range indicated by arrow 6 in FIG. 1a. In other words, even if a current pulse is applied when the rotating magnetic field is directed in a direction outside the range indicated by arrow 6, no bubbles are generated. As shown in FIG. 1a, the angle between arrow 11 and arrow 5 representing the direction of the bisector of opening angle 42 of cusp portion 2 is approximately 450, and the angle between arrow 11 and arrow 4 is approximately 450. It is 2nd.

Therefore, as shown in FIG. 2a, the first cusp portion 21
A transfer path is formed so that the angle 14 formed by the bisector 50 of the opening angle of the second cusp portion 22 and the bisector 51 of the opening angle of the second cusp portion 22 is 900 or more, and an electric current is applied to each of the cusp portions. A first conductor pattern 19 and a second conductor pattern 20 are provided which are connected in series.
First current pulses 1 with different applied phases as shown in Figure b
6 and the second current pulse 17, the first current pulse 16 generates a bubble only in the first cusp portion 21, and the second current pulse generates a bubble in the second cusp portion 22.
Bubbles occur only in As described above, by using the basic principle of the present invention, bubbles can be selectively generated in two different cusp portions using conductor patterns that are electrically connected in series. In FIG. 2b, the axis 40' represents the phase of the current pulse, and the vertical axis 41 represents the amplitude of the current pulse. Next, the operation of the first embodiment of the present invention will be explained with reference to FIG.

In FIG. 3, reference numeral 30 is the first major transfer path, reference numeral 31 is the second major transfer path, reference numeral 32 is the first minor transfer path group, and reference numeral 33 is the second minor transfer path group. , the same numerals 34 and 35 are the first and second magnetic bubble transfer gates, respectively, the same numerals 36 and 37 are the first and second magnetic bubble detectors, respectively, the same numeral 6
0 is an arrow representing the [110] direction of the magnetic thin film. In this embodiment, the first cusp portion 21 is
By bending a part of the transfer path in the [112] direction shown by the arrow 61, a bisector 50 of the opening angle of the first cusp portion 21 and a bisector 51 of the opening angle of the second cusp portion 22 are formed. The angle 14 between the two is 90 degrees.

The shapes of the transfer paths indicated by reference numerals 30 and 31 are slightly different from those shown in FIG. 2a, but the shapes of the cusp portions directly involved in bubble generation are similar; b
, bubbles can be selectively generated in the first cusp portion 21 and the second cusp portion 22 based on the basic principle explained with reference to FIGS. 2a and 2b. Specifically, the first current pulse 1 in the direction shown by the arrow 7 is applied to the first conductor pattern 19 and the second conductor pattern 201.
6 and the second current pulse 17, bubbles can be generated in the first cusp portion 21 by the first current pulse 16 and in the second cusp portion 22 by the second current pulse 17. . FIG. 4 shows the cusp portion 21 of FIG.
By bending a portion of the first major transfer path including the arrow 62 in the [011] direction, the bisector 50 of the opening angle of the first cusp portion 21 and the second cusp portion 2 are bent.
This is a second embodiment of the present invention in which the angle 14 formed by the bisector 51 of the opening angle of 2 is 12 degrees.

In FIG. 4, the reference number 60 is [110] of the magnetic thin film.
It is an arrow indicating a direction. FIG. 5 shows the first cusp portion 2.
By bending a part of the first major transfer path including 1 in the [101] direction shown by the arrow 63, the bisector 50 of the opening angle of the first cusp part 21 and the second cusp part 2
The angle 14 formed with the bisector 51 of the opening angle of 2 is 120o.
This is a third embodiment of the present invention.

FIG. 6 shows a fourth embodiment of the present invention in which the bent portion of the first major transfer path including the first cusp portion 21 is longer by one bit than the third embodiment shown in FIG. . As a result, it is possible to reduce the influence of the magnetic field contributed by the current pulse applied to the conductor pattern 15 on the bubbles transferred on the first major transfer path.
FIG. 7 shows the first cusp portion 21 on the [112] side of the first major transfer path formed in the [110] direction and the second major transfer path formed in the [110] direction.
By providing the first conductor pattern 19 and the second conductor pattern 20 on the second cusp portion 22 on the side [112], the bisector 50 of the opening angle of the first cusp portion 21 is formed.
This is a fifth embodiment of the present invention in which the angle 14 between the opening angle and the bisector 51 of the opening angle of the second cusp portion 22 is 1800.

FIG. 8 shows the first major transfer path 30 formed in the [110] direction, the second major transfer path 31, and the third major transfer path 24 formed in the [112] direction as indicated by the arrow 60. A first minor transfer path group 32, a second minor transfer path group 33, and a third minor transfer path group 25 are provided, and a part of the first major transfer path is indicated by an arrow 62 [01
1] direction, and 1 of the first major transfer path.
By bending the part in the [101] direction shown by the arrow 63, the bisector 50 of the opening angle of the first cusp part 21 with the hairpin part of the conductor pattern and the second cusp part 2 are formed.
This is a sixth embodiment of the present invention, in which the directions of the bisector 51 of the opening angle of the second cusp portion 23 and the bisector 52 of the opening angle of the third cusp portion 23 are each spaced at intervals of 120 degrees. A first current pulse 16 is applied to the first conductor pattern 19, the second conductor pattern 20, and the third conductor pattern 28 in the direction of the arrow 7.
When the second current pulse 17 and the third current pulse 29 are applied, the first cusp portion 21 is caused by the first current pulse 16.
Then, the second current pulse 17 causes the second cusp portion 22 to
Furthermore, bubbles can be selectively generated in the third cusp portion 23 by the third current pulse 29. In FIG. 8, reference numeral 26 is the third magnetic bubble transfer gate. FIG. 9 shows a seventh embodiment of the present invention in which the pattern widths of the first conductor pattern 19 and the second conductor pattern 20 are changed.

If the direction indicated by the arrow 60 is the [112] direction of the magnetic thin film, the first cusp portion 21 is located on the pad side of the transfer path, and the second cusp portion 22 is located on the super side of the transfer path. Therefore, the bias magnetic field component caused by the charged wall generated in both cusp parts is larger in the second cusp part 22 than in the first cusp part 21. Therefore, as shown in this embodiment, the first conductor pattern 1
By making the pattern width of conductor pattern 9 narrower than that of first conductor pattern 20, the total bias magnetic field components induced by the current pulse and charge door can be made approximately equal. As described above, according to the present invention, bubbles can be selectively generated by hairpin-shaped conductor patterns electrically connected in series provided at different cusp portions on a plurality of transfer paths. It is possible to provide a continuous disk type magnetic bubble element that employs the Bun-Odd method and has an extremely high data rate.

The shapes of the major transfer path, the group of minor transfer paths, and the hairpin conductor pattern are other than those shown in FIGS. 3, 4, 5, 6, 7, 8, and 9. Although various methods can be considered, it goes without saying that any method that can transfer bubbles according to the principle explained using FIGS. 1 and 2 is included in the present invention.

[Brief explanation of drawings]

Figure 1a, Figure 1, Figure 2a and Figure 2b are diagrams for explaining the basic principle of the present invention, Figure 3 is the first diagram of the present invention.
FIG. 4 is a diagram showing a second embodiment of the invention, FIG. 5 is a diagram showing a third embodiment of the invention, and FIG. 6 is a diagram showing a fourth embodiment of the invention. FIG. 7 is a diagram showing a fifth embodiment of the invention, FIG. 8 is a diagram showing a sixth embodiment of the invention, and FIG. 9 is a diagram showing a seventh embodiment of the invention. FIG. In the figure, 1 is a magnetic bubble transfer path, 2 is a cusp portion of the transfer path, 3 is a hairpin-shaped conductor pattern, 4 and 5 are arrows representing the direction of the rotating magnetic field, 6 is an arrow representing the applied phase range of the current pulse, and 7 is an arrow indicating the direction of the current pulse,
8 is a magnetic thin film, 9 is an arrow indicating the direction of the bias magnetic field,
1 is a magnetic baffle, 11 is an arrow indicating the direction of the bisector of the cusp opening angle, 12 is the operating amplitude of the current pulse (IG)
The vertical axis represents the phase of the current pulse (DLY).
14 represents the bisector of the first cusp part and the second
The angles 16 and 17 made with the bisector of the cusp part are the first
and a second current pulse; 18 is an arrow representing an angle defining the phase of the current pulse; 19, two rivers are respectively connected to the first and second
hairpin-like conductor patterns, 21 and 22 are the first
and a second cusp portion, 23 a third cusp portion, 24 a third major transfer path, 25 a third minor transfer path group,
26 is a third magnetic bubble transfer gate, 27 is a third magnetic bubble detector, 28 is a third hairpin conductor pattern, 29 is a third current pulse, 30 and 31 are first and second measures, respectively. Transfer paths 32 and 33 are first and second minor transfer groups, respectively; 34 and 35 are first and second magnetic bubble transfer gates, 36;
37 are first and second magnetic bubble detectors, 40 is a horizontal axis representing the phase of the current pulse, 41 is an arrow representing the amplitude of the current pulse, 42 is an arrow representing the opening angle of the cusp portion,
50, 51, 52 are arrows representing the directions of the bisectors of the opening angles of the first, second and third cusp portions; 60, 61, 6;
2 and 63 are the [110] direction and [112] direction of the magnetic thin film, respectively.
These are arrows representing directions, [011] direction, and [101] direction. O - Figure (b) O2 figure (b) Ga, figure (of 2 figures) O S figure 4 figures 4o 8 figure

Claims (1)

[Claims] 1. A first major transfer path, a second major transfer path, a first minor transfer path group, and a second minor transfer path formed by selectively implanting ions onto a magnetic thin film capable of retaining magnetic bubbles. In the even-odd contiguous disk type magnetic bubble element having a continuous disk, a first cusp portion on the first major transfer path and a second cusp portion on the second major transfer path. first and second hairpin-shaped conductor patterns electrically connected in series; A contiguous disk type magnetic bubble element characterized in that the angle formed with the segment line is 90° or more.