JPS5841483A - Magnetic bubble detector - Google Patents

Abstract

PURPOSE:To make the transfer of bubbles easy, by providing three or more folding points at a pattern intermediate part of a chevron pattern. CONSTITUTION:Three folding points A are formed at an extending device chevron pattern 10 of four-times period. Thus, a distance L2 is taken as L2<=lambda and smooth and stable transfer of bubbles can be performed. Thus, a magnetic bubble detector using the chevron pattern with less PGM noise to consecutive bubble trains, without bias margin loss and with triple length period can easily be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the output of a magnetic puzzle detector that uses a magnetic bubble element, and more particularly, is one of the magnetic bubble elements.

As a magnetic puzzle detector that converts the presence or absence of a magnetic bubble into an electrical signal, a thick film type detection II that utilizes the magnetoresistive effect is commonly used. In this #i, in order to obtain a large detection output, the magnetic bubble is enlarged into a string-shaped bubble several hundred times larger before the detector, and then detected by the detector), and a pattern can be formed at the same time as the bubble transfer path. Furthermore, since the film is thick, it has the advantage that the permissible value of the K1m1 control current O can be increased.

FIG. 1 is a diagram showing the configuration of a magnetic bubble detector. In the figure, D is a detector line that forms a detector, and S is a magnifier that expands the magnetic puzzle into a string-like bubble. It is formed of a soft ferromagnetic thin film such as OA turn D, 8Fi perm 4A, etc., and is constructed by stacking a large number of chevron patterns in the horizontal direction. liR is a rotating magnetic field rotating in the same plane, HD is a bias magnetic field applied directly to the paper 113), and both are external magnetic fields applied from the outside.

The magnetic bubble is transferred to the direction of the arrow by the rotating magnetic field 1iR. When the magnetic puzzle is transferred under the expansion 9B, it is expanded in the direction of lateral force and becomes a t-shaped bubble. Figure K and X are the detector currents applied to the detector line from the outside.The detection output is the W@ edge voltage output of the detector line when the string bubble l passes under the detector line DO. Stone obtained as.

Ko C': ttwiNari0@Ki Puzzle Detection S.

Conventionally, only the puzzle string transferred at 2-bit intervals was detected, so the rotating magnetic field rotated twice (1 bit).
It was only necessary to read OfI4@ (one bubble).

However, recently, in order to double the data read speed, continuous bubble strings have been detected using magnetic bubble detection. In this case, one bit of information is read out with one rotation of the magnetic field), and the data rate is doubled.

When attempting to read out this continuous bubble array using conventional magnetic bubble detectors, the following problems arose.

In Fig. 2, at the time when magnetic bubble B1 is detected on magnetic bubble detection line D, the nearest bubble is immediately before detector line D or electromagnetic expansion Is A turn S.
(lo, 1lx). BO2°1' is an O-nearest neighbor puzzle in the case of a conventional 2-bit spacing bubble string. In this case, at the time of detecting the magnetic bubble Bl, the leakage magnetic field from the nearest bubble BOJ1 is detected by the detector light νD.
is received, and the detection output is large! ! It comes as noise.

Note that this is the A magnifier pattern 0ll1 stage. When reading continuous bubble arrays, this large noise (hereinafter P(
(referred to as 2M noise), it was not possible to achieve a practically sufficient 8/M ratio. As a measure against this PGM noise, it has been proposed to make the period of the expander sIO chevron pattern around the detector line 00 three times longer or more, and to move the nearest bubble Boil away from the detector line.

As a result of prototyping and experimenting with such a pattern, it was found that there are 1III@ points of first order. That is, the bubble diameter used in the prototype was 1.5 μm1&,ff Inalub Ap
The -on period was 6-0-@h expander Siep four pattern period was 3 times long 018 voice crane, but as a result of evaluating this,
Although the 10M noise was suppressed, as a side effect, as illustrated in No. 311, li! j-ilv-gin characteristics K11l
1511 was generated. That is, the magnifier pattern is HB
Puzzle transference t- is raised on the lower limit side of , pi 7 as i-
Jin O lower @ lost a lot. In addition.

In the figure, M is i inner loop transfer, X is expander transfer,
Part #1 indicates an error area.

It is therefore an object of the present invention to reduce the period of the magnifier pattern to 3.
The objective is to provide a magnetic puzzle detector that does not cause bubble transfer errors on the lower limit side of the bias margin even when the length is double or more.

In order to achieve the above-mentioned on-leopard effect, in the magnetic bubble detector using the unexploded W14, the chevron pattern 0 shape is devised,
The feature is that pull transfer is enabled by having three or more ORm points in the middle of the chevron pattern.

Hereinafter, the present invention will be explained in detail using the example of the present invention 1-*vagina.

FIG. 4 shows an example of a theory for explaining the present invention.

(1) shows an example of a basic transfer path pattern in i-in-p], and the period λ is 6.0μ.

(b) shows an example of the 4x Nagaoka period O enlarger chevron pattern 0 conventional IIO at the same magnification as (a). (C)
teeth.

An example of a 4x long phase magnifier chevron pattern due to a misfire is also shown in C. In this example, JII! A 3m long point is formed. To do this, use a chevron pattern.

Examples of various chevron patterns according to the present invention are shown in FIG. In both cases, the number of bending points is 3990. t-failure can be similarly applied to each pattern like this.

Note that three or more bending points can be formed, and the bending points can be applied to a part or all of the expansion.

FIG. 6 shows another embodiment according to the present invention. This example shows an example in which the present invention is applied to the chevron pattern of the detector line, and the chevron pattern period of the detector line is set to 3.
J! A pattern having three or more one music point is used. In the example shown in FIG. 6, a $15WJ(d)0 Chevron pattern is used for the detector line.

As explained above, according to the present invention, magnetic bubble detection S using a chevron pattern with a period of 3 times or more, which has less PGM noise for a continuous puzzle string and has no vias or Ilc margins, can be easily performed. Kotakade IJ).

Incidentally, according to the above explanation, magnetic puzzle detection ai#i.

For magnetic bubble detectors, the magnification pattern before and after the detector line is made longer than 3 times the period, and the magnification pattern is made longer than 3 times longer. It is also true that the present invention can be applied in exactly the same way.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the O configuration of the magnetic puzzle detector, Figure 2 is a diagram showing the interval score when reading continuous bubble strings at W1, and Figure 3 is a diagram showing the conventional O threshold problem. FIG. 5 is a diagram showing an example of a chevron pattern 04liOJ koji according to the present invention, and FIG. 6 is a diagram showing an example of a dormer vagina in which a misfire is applied to the detector line. -m+1-・Enlarger pattern, D・・11 vague detector lines, 10・・・Chevron pattern. Figure 1 Figure 2 1-1q (5e)

Claims (1)

[Scope of Claims] 1. In a magnetic bubble detector in which a magnifying device is provided before and after a detector line, a part or the whole of the magnifying device is formed in an O-chevron pattern with a period of three times longer period or more, and this chevron pattern A magnetic puzzle detector characterized by having 341 or more bending points in the middle part of the pattern. 2. The magnetic bubble detector according to claim 1, wherein the detector line is formed of a chevron pattern with a period of three times longer or more, and has a bending point of 3g1 or more in the middle of the pattern.