JPS5823382A - Contiguous disc bubble detector and eraser - Google Patents

Abstract

PURPOSE:To stabilize the operation, by narrowering a conductor pattern interval of a part crossed with an ion implanted transfer pattern than other parts and arranging the conductor patterns so that the bubbles can be expanded to both sides from the crossing part. CONSTITUTION:When a bubble is transferred to a position ''B'' on an ion implanted transfer pattern ''1'', an expanding pulse current flows to a bubble expansion conductor ''3''. The bubble is expanded from the position ''B'' to a position ''A'' and a ''A''' with this pulse current. The expanded bubble is detected for its magnetic field at a thin film permalloy detector ''4'' and shrinked. Since a charged wall due to the ion implanted transfer pattern ''1'' is generated at a point B at the center of the expanded bubble and the tendency of the expanded bubble easily to be shrinked to the center acts at the same time, the shrinked bubble can easily be made stable to the position ''B''.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a Contiguous Ink Ass Disc Bubble Estimator V
This is related to this.

Conventionally, in magnetic bubble elements, in order to transfer magnetic bubbles (hereinafter simply referred to as bubbles), T perbatan,
(2) A permalloy element shaped like a putter 7 or an asymmetrical chevron pattern was formed on a curved garnet (hereinafter referred to as a permalloy device). But 1. In a magnetic bubble element using such a permalloy transfer pattern, it has been very difficult to reduce the bubble diameter to 2 μm or less in terms of phosphorography technology and drive technology for forming the entire bubble. Therefore, higher q
! As a method to obtain a younger sister bubble device, the Contigy and Asuken disk bubble devices (hereinafter referred to as CJJ devices) were proposed.

The basic concept regarding the transfer of bubbles using the contiguous device ASUS DISC pattern sound is described in the Ivy Confluence Proceedings (A.).

I, P0once ProceecHngs)
J No. 19, page 339 (1973), it is described in an article by Rufuet et al.

Regarding the configuration of the contiguous disk bubble device, IE.
E TRAZAKUSHI GEN'S ON MAGNETICS (IN
P;li 'i'rans, on Magnetics
) Volume M15 M 1642”e-shi (1979)
and The Bell System by Nerlin et al. of Bell Laboratories.
Technical Journal ('lbe He1l Sys
tem 'I'technical Journal)
This is detailed in papers such as Volume 59, Page 229 (1980).

A description of the bubble detector according to the invention is found in the aforementioned document The Bell-System Technical Journal.

Figure wc1 shows a conventional example. The operation of the detector will be explained using FIG.

When the bubble transferred through the first transfer path "1°" by charge/doul reaches the position "5°," a pulse current is applied to the bubble expansion conductor "31" to move the bubble to the position "5" -.
The magnetic field from the enlarged bubble (called a stretch bubble) is detected by a pattern "4°" made of a thin permalloy film. Magnetic field detection utilizes the bending resistance effect.

After detection, when the bubble expansion pulse current is cut off, the stretch bubble contracts. When a stretch bubble returns to a bubble, it is generally not clear where between position -bI *6'' it becomes stable.

When there is no point to fix the bubble between the positions "5° and 6°", the stretch bubble starts to shrink from the west side, so the contracted bubble may exist near the middle between the positions 5° and 6°. In the example shown in Figure 1, by cutting off the pulse current at the timing when the charge point is formed at position "6', the stretch bubble is shrunk from position 5° to position 6°. I'm letting you do it.

By selecting the timing in this way, the bubble can be moved from the first transfer path to the second transfer path and non-destructive readout can be performed.

Therefore, the time required for reading out is at least twice the time required to expand the bubble from position "5" to position 6". Also, the position of the shrinking bubble is stabilized by the chartite wall. Therefore, if the charsite wall becomes weak, the fixation of the bubble becomes unstable.

The object of the present invention is to compensate for the above-mentioned drawbacks and provide a more stable continuous disk bubble detector.

According to the present invention, the ion implantation transfer pattern in a contiguous disk bubble detector formed on a magnetic garnet film intersects with the ion implantation transfer pattern so as to be approximately divided into two, and the shape of the conductor pattern is A contiguous disk bubble detector is obtained in which the distance between the conductor patterns in the injection transfer pattern part is narrower by °C than in other parts.Next, referring to the drawings, the present invention will be described. FIG. 2 is a pattern layout diagram showing the first embodiment of the present invention. Methods for forming ion implantation patterns are known. Ion implantation transfer pattern formed by ion implantation °
1” conductor pattern to expand and eliminate bubbles
3 and a thin film permalloy pattern "41" for detecting bubbles.Next, the bubble detection operation of the present invention will be explained. Transfer to Ita1 [
An expanding pulse current as shown in FIG. 3 is passed through the bubble expanding conductor "3". This pulse current causes the bubble to become
The figure is enlarged from the position °B° to the positions "A" and "^°.The distances are designed to be approximately equal. Therefore, the distance 1 is the same as the distance "5" in Figure 1. −°6“
Even if the distance is equal, the time required to expand the bubble is half that of the conventional example.

Therefore, the time required for bubble expansion and contraction is halved compared to the conventional example. The enlarged bubble is detected by a magnetic field by a thin 1-quality permalloy Yokota device "4°" and is then made smaller. When the bubble is reduced, the enlarged bubble shrinks from both sides at the same speed, so it shrinks toward the center. According to the arrangement of the present invention, the ion implantation transfer pattern °
The Chasit fist wall by 1° is the center of the expanding bubble,
Because the occurrence at point B and the tendency of expanding bubbles to shrink toward the center simultaneously act, the contracted pub distance is made to be narrower than position Bo compared to a. As a result, the magnetic field distribution generated from the conductor pattern generates a stronger magnetic field at position °B'' than at other positions.Because of this magnetic field distribution, the shrinking bubble position*I
B- causes it to exist stably.

In this way, by using the characteristics of the bubble when contracting, the shape of the distribution outside the conductor, the time required for expansion and contraction can be shortened, and the time required for expansion and contraction can be shortened. It is possible to stabilize the position of the bubble at the time. It also slows down the fall of the pulse current,
Stability can be further increased by maintaining the magnetic field distribution until the bubble is sufficiently reduced. The bubble returned to position "Bo" is transferred over the ion implantation transfer pattern °1, thereby allowing stable non-destructive reading.

Furthermore, when the bubble moves to position 'B°, if a pulse current in the opposite direction to the expanded pulse current is passed through the conductor pattern 131, the bubble at position 'B' will receive a stronger cancellation field than other parts. , you can also erase bubbles.

In this way, bubbles can also be erased using the same pattern arrangement as shown in FIG.

FIG. 3 is a pattern layout diagram of a second embodiment of the present invention. A conductor pattern and a thin film permalloy pattern are arranged at one corner of the ion implantation transfer pattern 1.
Detection and erasure of bubbles are performed in the same manner as in the first embodiment.

According to the present invention, a more stable bubble detection and erasure device can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example at t42. Figure 3 shows the first and second embodiments of the present invention.
An example is shown below. In the figure, 1 is an ion implantation transfer pattern, 2 is an ion implantation transfer pattern (second transfer path), 3 is a conductor pattern, 4 is a thin 11'4 permalloy pattern, 5, 6 . A, A', B
are symbols indicating the respective positions. Figure 1 Figure 2

Claims (1)

[Claims] Contiguous garnet film formed on a flexible garnet film.
In a disk bubble element, the conductor pattern spacing of the part of the bubble expansion/elimination conductor that faces the ion implantation transfer pattern is set lower than other parts, and the bubble is expanded from the intersection to both sides.