JPS5883378A - Magnetic bubble memory element - Google Patents

Abstract

PURPOSE:To prevent a secondary effect when a pattern period is more than doubled, and to stabilize operation with a wide bias magnetic-field margin by removing a sector part constituting the front half part of a bubble detector and thus changing the shape of a stretcher entirely. CONSTITUTION:A bubble stretcher 1' consists of only the rear-half part 18, and is formed rectangularly entirely; and c-shaped cut parts 1'N1 and 1'N2 which cut an array of chevron patterns 2 are formed at a coupling part X for an entrance transfer path Iin to the stretcher 1'. As a result, even when the pattern period lambda is more than doubled, the secondary effect is prevented and stable operation which has less margin loss at the upper and lower limits of the bias magnetic field is performed with the wide bias magnetic field margin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a magnetic bubble memory device, and a magnetic bubble expander oe* which is one of the components of the magnetic bubble memory device O.
*This is related to *.

In general, in a magnetic puzzle sled element, the presence or absence of a magnetic puzzle is converted into an electrical signal.In order to obtain a large detection output from a magnetic bubble detector, the magnetic bubble is expanded into a string-shaped bubble several hundred times in size before the detector zero, and then 40, which relates to the part of the present invention that enlarges the magnetic bubble in front of the detector, that is, the improvement of the magnetic bubble enlargement IIO, in which a method of detecting with a detector is used.

FIG. 1 is a pattern configuration diagram showing an example of the 1st II Hiro conventional O magnetic bubble expander. In the figure i, the basic configuration is enlarger 1 Hiro Chevron pattern 2! ! Formed as an element >), ζ
Stack one OV apron pattern 2 horizontally and make the first one.
911-1. I'm so excited about the Hou Dan. Further, a magnetic bubble detector line 3 is electrically distributed to the next stage 11 after the in-th stage. These are made of a soft ferromagnetic thin film such as permalloy made by O Pattern Co., Ltd. Further, in the figure, 4 indicates a bias magnetic field (Hm+), an S-line in-plane rotating magnetic field (!b), and an arrow P indicates the magnetic bubble transfer direction.

In the ζO 51 structure, the inlet transfer path IIs of the expander 1
When the magnetic bubble 1 transferred upwardly is transferred vertically through the enlarger 10, it is enlarged horizontally. In this way, the magnetic bubble B1 is expanded into a string-like magnetic bubble], and the magnetic bubble B1 is expanded (full stretch) to both the left and right ends of the expander 10.

FIG. 2 is a simplified representation of the magnetic puzzle magnifier 10 shown in FIG. 1), and since the same symbols as in FIG. 1 are the same elements, their explanation will be omitted. In the figure, the magnifying device can be roughly divided into two parts as shown in FIG. One of them is the fan-shaped shape that forms the first half of the ore.
The other is the 8tr portion 18 forming the latter half. As the fan section 1r consisting of the above 11 to 1m stages advances to the next stage, the number of stacked chevron patterns (expanded number of stages) 11 gradually increases, and becomes lt<Ig<...<1m. iru. By gradually increasing the number of enlarged stages 11, the fan portion 1F becomes fan-shaped. i9, the angle of this sector-shaped part is called the opening angle of the magnifying device 1, and the other part is Str which consists of steps from 1m+t to 1m.
The portion 1s has a constant number of magnification stages ml and is formed into a rectangle.

However, in the magnetic bubble expander 1 having the above configuration, if the diameter of the magnetic bubbles used becomes minute (approximately 2 μm or less) due to the high density of the magnetic bubble memory element, or if the operating speed is increased (by increasing the speed). It is well known that when the number of pixels exceeds about 200, the following problem occurs in the enlarger 1. That is, at the upper limit side of the bias magnetic field (IIn) 4o main jHm, the Btr portion 1
At B, the magnetic bubble Ig was not fully stretched in the lateral direction of the expander 40, and no large output was obtained from the detector.

Between ζO and m#i as shown in FIG.
It is also known that a complete countermeasure can be taken by making the chevron pattern 20 horse period λ, which is a basic component, very hot. However, experiments conducted by the inventors have revealed that the following problems occur as a side effect due to the fact that the period λ is greatly increased by 1k.

That is, the bias magnetic field (Hm) is 4! -jinjllll
The transference of the magnetic bubble is activated on the lower limit side of ID,
K magnetic pub and uneven pub as shown in 1, V and 1kIJ
1 Bubble transfer malfunction occurs 1, due to this malfunction i-
This means that the gin ΔHB will be halved.

Normally, the period of the pattern as the basic component constituting the magnetic bubble transfer circuit is λ′, and the diameter of the magnetic bubble used is 4.
In this case, λ' blades 34 to 4- are generally used. i9, the chevron pattern 20 period λ as the basic component of the expander 10 in question is usually 4d
-6d are used. However, as mentioned above, it is possible to stretch the magnetic bubble to 7 even on the upper limit side of the margin IH11 by increasing the chevron pattern 20j1 period λ of the basic configuration of the expander 10 to -8 or more. there were.

For example, according to an experiment using a magnetic puzzle with a diameter of approximately 2μ and varying the period λ of 10 chevron patterns of an expander 10 and 20, it was found that the full stretch O problem could be completely resolved by expanding this period λ from 8d to 164. In this case, the period λ=84-1640 times 11 times the period λ' of the normal transfer path, 34-4d.

ζO, therefore, the above 84 will be referred to as a double length period, and 164 will be referred to as a quadruple length period. However, when the period λ was increased, uneven bubble malfunction occurred as a side effect, but according to the same experiment, this side effect occurred when the period λ was increased (approximately 74).

FIG. 3 shows the results of the above-mentioned experiment for the conventional magnifying device 10 problem. Diameter approx. 2
11wxt) Magnetic puzzle expands for various periods λ1)
1 is the result of experimentally determining the bias magnetic field region in which it operates normally. In the same figure, region M is an error region in which the magnetic bubble cannot be fully stretched, region mH is an error region where unevenness malfunctions as a side effect, and region C is a stable operation region. As is clear from the figure: l! Rice O expansion 1iF1 expansion, period λ 4 ~ 6-
Understand that there is no rounding period λ that allows stable operation.

Therefore, the present invention eliminates the above-mentioned problem of the conventional expander, and even if the binding period of the basic components of the expander is longer than the double length period, a mistransfer error occurs on the lower limit side of the bias magnetic field (Hl) O. It is an object of the present invention to provide a magnetic bubble memory device equipped with a magnetic bubble expander that can provide stable operation without any problems.

In order to achieve this objective, the present invention is unique in that the fan-shaped OFam portion constituting the first half of the magnetic bubble detector is removed, and the shape of the entire magnifying device is changed. Embodiments of the present invention will be described in detail below with reference to the drawings.

In the present invention, as shown in FIG.
It has become clear from detailed evaluation of experimental results that this does not occur in the r part, so the basic configuration of the expander l! In addition to making the prime period more than double the length, the fan portion of the expander that causes a 0-stage mistransfer malfunction on the lower limit side of the margin H1 is removed.

FIG. 4 is a diagram similar to FIG. 2 showing an example of a magnetic bubble expander related to a magnetic bubble memory device according to the present invention, and the same symbols as those in the previous diagram represent the same elements, so a description thereof will be omitted. In the same figure, the magnetic bubble expander 1' is
The entire O-shape is formed with a rectangular shape, and the arrangement of the line and pattern 2 is cut at the connection part χ with the inlet transfer path fim where the magnetic bubble enters the expander 1'. A V-shaped vain part 1 t4'** is formed. In this case, the ogBn included part 1'N 1 p
t/, l B sHas an important function, if 01101
Containment part I'N1 e 1'N Wealthless 7, ltr part l
It has become clear through experiments that an error occurs in the first stage, as explained in FIGS. 2 and 3, which causes the error area BKs to disappear. FIG. 5 shows a pattern configuration diagram around the large joint part X shown in FIG. 411 (9), and the same symbols as in FIG. Omit the feathers. In the same figure, an O-chevron pattern is used as a basic component using an O magnetic bubble at approximately 2P corner.
4 J” vRm S 22 votes, 2x length, 3x length, 4x length There was no error in all <S, and no margin loss occurred in the error area B shown in FIG.

In the above embodiment, a case was explained in which a chevron pattern was used as the pattern of the basic constituent elements of the enlarger, but the present invention is not limited to limpness.
Of course, even if patterns having various other shapes are used, the same O effect as described above can be obtained.

In the above embodiment, the cut-in portions Nt and Nl are set to V
Although the description has been made regarding the case where the shape is a letter shape, the present invention is not limited to this shape, and the same effect as described above can be obtained even when the shape has various other shapes and sizes. Totocho, of course.

As explained above, according to the present invention 1j11, both cases can be prevented even if the pattern period λ is twice as long or more, and the upper limit of the bias magnetic field H1 as explained in FIG. #I3.

An extremely valuable effect can be obtained in that it is possible to provide a magnetic puzzle expander that has no margin at the lower limit and can operate stably with a wide bias magnetic field margin H1l.

[Brief explanation of drawings]

FIG. 1 is a pattern configuration diagram showing an example of a conventional magnetic bubble expander, FIG. 2 is a simplified diagram of FIG. 1, and FIG. 3 is a diagram explaining problems with the conventional magnetic bubble expander. FIG. 4 is a diagram showing an example of a magnetic bubble expander related to the magnetic bubble memory device according to the present invention, and FIG. 5 is a pattern configuration diagram showing the vicinity of the joint portion X in FIG. 4. 1.1' --- Enlarger, 1r --- Faa part,
1, s@**Sty part, ['*x el'*g 11
＠＠etFJj）included iS, 2--Chevron pattern, 3...Magnetic bubble detector line,
4... Bias magnetic field (Hl), 5.0... In-plane rotating magnetic field (Hl). Fig. 1 Fig. 2 Fig. 3 (2f1 length) (3 camellia length) (4 oar length) Stem refinement $1111 Pengjin Fig. 4 Fig. 5

Claims (1)

[Claims] A magnetic bubble enlarging element K is equipped with a magnetic bubble enlarging device for enlarging magnetic bubbles and transmitting them to a detector. A magnetic paplume characterized by having a notch part for cutting the pattern O array on both sides of the connection part with the transfer path! 9 elements.