JPS61994A - Magnetic bubble memory device - Google Patents

Abstract

PURPOSE:To obtain a magnetic bubble memory device where good start/stop characteristics are attained without degaradation of the transfer characteristic, by constituting a bar pattern with plural pattern element pieces to shorten the effective length of the bar pattern. CONSTITUTION:A bar pattern 12' connecting adjacent minor loops 1, each of which consists of transfer patterns 11-15, to each other consists of the first pattern element piece 12a and the second pattern element piece 12b which are divided by forming a pattern break part, where no patterns exist, in the approximately center part of the pattern 12'. Since the repulsive magnetic pole generated in the front end part of the bar pattern 12' is weakened if a holding magnetic field is applied in the stop direction of an arrow 8, magnetic bubbles are held stably in respective leg parts 11a and 13a of transfer patterns 11 and 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic puzzle memory device having a field access type major/minor configuration, and particularly to improvement of its start/stop characteristics.

[Background of the invention]

Figure 1 shows, for example, JP-A-56-44rfF2”-1F2:
1 is a plan configuration diagram of main parts showing an example of a magnetic bubble memory element which is known in the literature. In the same figure, 1t
i Minor loop that stores magnetic bubble information, 2 is a read measure line that transfers read information, 3 is a 2-item measure line that transfers write information, 4 is a magnetic puzzle detector that converts the presence or absence of magnetic bubbles into an electrical signal, sFi A magnetic bubble generator that writes magnetic bubble information onto the light mesh line 3; 6 a replicate gate that copies the magnetic bubbles on the mica loop 1 to the read measure line 2; 7 a replica gate that copies the magnetic bubbles on the light mesh line 3 to the liner loop. 1
It is a swap gate that replaces the magnetic bubble inside.

FIG. 2 is an enlarged plan view of the main parts near the swap gate explained in FIG. 1, and the same parts as in FIG. 1 are given the same reference numerals.

In the same figure, reference numerals 11, 12, 13, 14, and 15 are transfer patterns that constitute the magnetic bubble transfer path of the minor loop 1. In particular, the transfer pattern 12 is called a bar pattern that connects the adjacent minor loops 11 and 11. , this bar pattern 12 is transfer pattern 1 with a small pattern volume.
It has a function of preventing deterioration in transfer characteristics that occurs when magnetic bubbles are transferred from transfer pattern 13 having a large pattern volume to transfer pattern 13 having a large pattern volume. 21.22, 23.24 are transfer patterns that constitute the magnetic bubble transfer path of the light mesh line 3, 31.32.33 are bar patterns for assisting magnetic bubble transfer that connect the minor loop 1 and the light mesh line 3, -41U This is a conductor pattern constituting the swap gate 1 that connects the minor loop 1 and the light mesh line 3 and allows a swap operation current to flow. A conductive pattern is formed through the film. Note that P is the transfer direction of the magnetic bubble, and HR is a rotating magnetic field.The rotating magnetic field HR is applied in the direction of the arrow.

B is the stop direction when starting and stopping the magnetic bubble.

In the swap gate configured as described above, when the magnetic bubble is stopped, the minor loop 1 is transferred in the direction of the arrow P, and the magnetic bubble B transferred to the transfer pattern 11 and the transfer pattern 13, for example, is transferred to the rotating magnetic field H3. The holding magnetic field applied in the stop direction 8 causes the legs 11m, 1 of each transfer pattern it, 13 to
It is attracted by the attractive magnetic pole generated at 3a and stops at these legs 1ia and taa. Next, when a start operation is performed, the magnetic bubbles B stopped at each leg 10.13& are moved to the next transfer bubble 14. as the rotating magnetic field HR rotates. The signal is transferred to bar pattern 12, and a normal swift stop operation is performed.

However, in a swap gate configured in this way, when a holding magnetic field is applied in the stop direction 8, the magnetic bubbles B held in the transfer patterns 11 and 13 near the bar pattern 12 on the bias magnetic field upper limit side are extremely There was a problem that it easily disappeared.

[Purpose of the invention]

Therefore, the present invention has been developed in view of the above-mentioned problems, and its purpose is to obtain good start-stop characteristics without degrading the transfer characteristics by having a bar pattern. [Summary of the Invention] In order to achieve the above object, the present invention provides a magnetic bubble memory device in which the effective length of the line pattern is shortened. As shown in the enlarged plan view of the main part in FIG.
．． This is caused by the generation of a strong repelling magnetic pole 9 by the holding magnetic field applied in the stop direction 8 of the rotating magnetic field [11] at one end of the no(-) turn 12 that extends between the rotating magnetic field [11]. 12 is made up of a plurality of segmented) pattern pieces, and by shortening the effective length, the repulsion magnetic pole 9 is lowered and the magnetic bubble B is held at a predetermined position in the transfer pattern 11.13. It is something that makes you

[Embodiments of the invention]

Next, embodiments of the present invention will be described in detail using the drawings.

FIG. 4 is an enlarged plan view of essential parts near the swap gate for explaining one embodiment of the magnetic bubble memory element according to the present invention, and the same parts as in FIG. 2 are given the same reference numerals. In the same figure, the bar pattern 12' that connects the adjacent minor loops 1 is divided into two parts by forming a so-called pattern cutting part where the bar pattern 12' does not exist at approximately the center of the / lean. It is composed of a pattern elemental piece tZa and a second notch elemental piece 12b.

With this structure, as shown in FIG.
a, the magnetic bubble can be stably held at 13 m.

FIG. 6 is a bias magnetic field margin characteristic diagram of a magnetic bubble memory element in which the bar patterns 12 and 12' described above are actually fabricated using a magnetic bubble magnetic film having a diameter of about 2 μm. In the same figure, characteristic (1) is the conventional bar pattern 12. Characteristics . . . show the case where the bar pattern 12' according to the present invention is used, and characteristic I shows the case where the bar pattern 12' according to the present invention is used and the rotating magnetic field HR is continuously applied. As is clear from the figure, by using the bar pattern 12' according to the present invention, it is possible to reliably suppress a decrease in the bias magnetic field margin.

Of course, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention. For example, in the bar pattern 12' shown in FIG. 7(a), the first pattern element 12a is made of thick pattern polyurethane, and the second pattern element 12b is formed with thick pattern polyurethane.
This is constructed in the same way as the one shown in FIG. 4, except that the patterned polyurethane is formed smaller, and has the same effects. Moreover, the bar pattern 12 shown in FIG. 7(b) is
Two first bar pattern elemental pieces 12a' and a second bar pattern elemental piece 12b having the same pattern polyumy.
Furthermore, in the bar pattern 12' shown in FIG. 7(c), the bar pattern 12' is composed of a first pattern piece 12m with a large pattern porium, a second pattern piece 12b with a small pattern porium, A third pattern piece 12 having the same pattern polyurethane as the first pattern piece 12 &
In both configurations, the same effects as described above can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, by configuring the bar pattern connected between adjacent minor loops with a plurality of divided pattern pieces, good transfer characteristics can be achieved without deteriorating the transfer characteristics. It has an excellent effect in that it provides start-stop characteristics.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining an example of a conventional magnetic bubble memory device, and FIGS. 4 and 5 are diagrams for explaining an embodiment of a magnetic bubble memory device according to the present invention. An enlarged plan view, FIG. 6 is a diagram showing the bias magnetic field margin characteristics of the conventional magnetic bubble memory element and the present invention, FIG. 7 (a), (b)
, (e) is a plan view showing another example of a bar pattern for explaining another example of the magnetic bubble memory device according to the present invention. 1...Minor loop, 2...-Read major line, 3.Fist 0.Light mesha line, 7...Swap gate, 8...Magnetic baffle stop direction, 9.
... Repulsive magnetic pole, 11... Transfer pattern, 11a.
... Legs, 12.12' ... Herba turn, 12
V...First pattern elemental piece, 1za'...First bar pattern elemental piece, 12b...Second pattern elemental piece, 12b'...Second bar pattern elemental piece , 12CI
I...Third pattern piece, 13. i4, 15, 22
,23゜24... Transfer butter: y, 31, 32, 3
3...Bar pattern for transfer assistance, 41...
conductor pattern. Fig. 1 Fig. 2 Fig. 4 Fig. 5 Rotary embroidery 1st nail e)

Claims (1)

[Claims] In a magnetic bubble memory element, a bar pattern is provided in the vicinity of a swap gate where a plurality of minor loops and a write major line are coupled to rewrite magnetic bubble information, and a bar pattern is provided that couples adjacent minor loops. A magnetic bubble memory element characterized by being composed of a single piece.