JPS6048067B2 - magnetic bubble memory element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble storage device, particularly a magnetic bubble storage device that prevents the generation of extra magnetic bubbles when the operation of generating or dividing magnetic bubbles is repeated over a long period of time. This invention relates to bubble memory elements.

Generally, a magnetic bubble generator or divider formed in a magnetic bubble storage element has a hairpin-shaped conductor loop on a magnetic bubble transfer circuit, and a pulse current is passed through this conductor loop to generate and divide magnetic bubbles. Pulse current type devices have traditionally been widely used.

The magnetic bubble memory element of the present invention also relates to this pulse current type. FIG. 1 is a plan view of a main part showing an example of a conventional pattern of the pulse current type magnetic bubble circuit, particularly a magnetic bubble generating circuit.

In the figure, reference numeral 1 denotes a transfer circuit element forming a magnetic bubble transfer circuit, and this transfer circuit element 1 is formed of a thin film-like fine pattern made of a soft ferromagnetic material such as permalloy. 2 is a hairpin-shaped conductor loop through which an operating pulse current flows, and this conductor loop 2 is A'
- It is formed of a non-magnetic conductor thin film such as Cu or Au-Cr and is arranged to cross over the magnetic bubble transfer circuit.

3 is a rotating magnetic field (HR
), and this rotating magnetic field (HR) 3 rotates counterclockwise in order to transfer the magnetic bubble from right to left (in the direction of arrow P).

4 is a bias magnetic field (HB), and this bias magnetic field (
In order to make the magnetic bubble stably exist on the transfer circuit, HB) acts from the back side of the paper toward the front side.

In the magnetic bubble generation circuit configured as described above, information is written in the following manner.

First, when the direction of the rotating magnetic field (HR) 3 turns around 00, an operating pulse current is supplied to the conductor loop 2. At this time, the direction of the pulse current I is determined by the bias magnetic field (HB
), this pulse current I
As a result, five magnetic bubbles are generated within the hairpin loop of the conductor loop 2. This magnetic bubble B is transferred from right to left (in the direction of arrow P) on the transfer circuit as the rotating magnetic field (HR) 3 rotates, and magnetic bubble T' is the magnetic bubble previously written in this way. . in this case,
Writing the “1”, “0” pattern of information into the transfer circuit by causing pulse current 1 to flow or not flowing through the conductor loop 2 in accordance with the “1”, “0” pattern of the information. However, in the magnetic bubble generation circuit having the above configuration, if the pulse current I is supplied to the conductor loop 2 to generate magnetic bubbles, especially if the magnetic bubble generation operation is repeated for a long time, the conductor Undesirable extra magnetic bubbles 8 are simultaneously generated in area A inside loop 2, and when these extra magnetic bubbles 8 write information ゜゜0゛, they stray into the transfer circuit and write information ``1''. It will be written as .

In other words, even though information "1" is written to the transfer circuit in succession and information "0" is subsequently written, the bit position where this information "0" was written becomes information "1" when continuing. There was a risk that a malfunction would occur that would cause a series of errors to occur. Here, it has been found that the occurrence of malfunction due to the eruption of magnetic bubbles is due to the mechanism shown in FIGS. 2 and 3. That is, in FIG. 2, an operating pulse current 1 is applied to the conductor loop 2.
The magnetic bubble generated by supplying is then stretched along the inner edge of the hairpin portion 2a of the conductor loop 2 by the operating pulse current 1, and becomes a string-like magnetic bubble. In this case, the operating pulse current 1 generates a strong magnetic field that attracts the magnetic bubble 8 along the inner edge of the conductor loop 2, so that the generated magnetic bubble 3 B1
is stretched by the magnetic field while the operating pulse current 1 is flowing, and as shown in the figure, the hairpin portion 2a
It becomes an elongated magnetic bubble along the base of the . Next, when the supply of the operating pulse current 1 ends and the resulting magnetic field disappears, when this string-shaped magnetic bubble tries to contract into a normal magnetic bubble, two bubbles appear as shown in Figure 3. The magnetic bubbles Bl and B2 are cut to create an extra magnetic bubble type. Therefore, an object of the present invention has been made to solve the above-mentioned drawbacks, and is to provide a magnetic bubble storage element that prevents the generation of excess magnetic bubbles B2.

In order to achieve this purpose, the magnetic bubble memory element according to the present invention is provided with another conductor loop inside the conductor loop 2.

The magnetic bubble memory device according to the present invention will be described in detail below with reference to the drawings. 1. FIG. 4 is a plan view of a main part showing an embodiment of a magnetic bubble storage element, particularly a magnetic bubble generation circuit, according to the present invention, and since the same symbols as in FIG. 1 are the same elements, a description thereof will be omitted. In the same figure, another conductor loop 5 is arranged inside the conductor loop 2. The conductor loop 5 is formed of the same material as the conductor loop 2 in the same layer and with the same thickness. In addition, the hairpin portion 2 of this conductor loop 2
A heat dissipating butter 7 6 for dissipating the heat generated by the hairpin portion 2 a is provided at the tip of the hairpin portion 2 a so as to extend in the same layer and the same thickness and made of the same material as described above. In the magnetic bubble generation circuit configured in this manner, when an operating pulse current 1 is passed through the hairpin-shaped conductor loop 2, a pulse current 1'' in the same direction as the operating pulse current 1 is simultaneously supplied to the other conductor loop 5. do.

As a result, the pulse current 1'' generates a magnetic field that repels the magnetic bubbles along the outer edge of the conductor loop 5. Therefore, the magnetic bubble B1 generated by the supply of the operating pulse current 1 has a hairpin shape. conductor loop 2
Even if it tries to extend along the inner edge of the conductor loop 5 as shown in FIG. 2, it is blocked by the repulsive magnetic field generated at the outer edge of the conductor loop 5, and the conductor loop 5 no longer extends into a long, thin string. It is possible to reliably prevent such an error from causing unnecessary magnetic bubbles B2 to spring out. In addition, a heat dissipation pattern 6 is provided at the tip of the hairpin portion 2a of the conductor loop 2.
By providing this, it is possible to significantly reduce the high temperature rise at the tip of the hairpin portion 2a. FIG. 5 is a plan view of essential parts showing another embodiment of the conductor loop connecting method according to the present invention, and since the same symbols as in the previous figure represent the same elements, a description thereof will be omitted. In the same figure, another conductor loop 5 provided inside the hairpin-shaped conductor loop 2 has a conductor pattern 7 at one end of the hairpin-shaped conductor loop 2 so that the direction of the pulse current flowing through the conductor loop 2 is the same. are connected in series so that The other ends of the hairpin-shaped conductor loop 2 and other conductor loops 5 are bonding pads 8a.
, 8b, and these bonding pads 8a, 8b
By supplying a pulse current 1 from the outside through the conductor loops 2 and 5, a repulsive magnetic field is formed at the outer edge of the conductor loop 5 by passing the pulse current 1 of the same magnitude through the two types of conductor loops 2 and 5. This prevents the generation of extra magnetic bubbles 8 that bubble up on the inner edge of the conductor loop 2. Note that although the magnetic bubble storage element according to the present invention has been described only with respect to a magnetic bubble generation circuit in the above embodiment, the present invention is not limited to this, and even when applied to a magnetic bubble splitting circuit, the same effect as described above can be obtained. Effects can be obtained.

As explained above, according to the magnetic bubble storage element of the present invention, even if magnetic bubbles are generated or divided over a long period of time, generation of excess magnetic bubbles is reliably prevented and no malfunction occurs. Extremely excellent effects can be obtained by providing a magnetic bubble memory element.

[Brief Description of the Drawings] Figure 1 is a plan view of essential parts showing an example of a conventional pattern of a magnetic bubble memory element, and Figures 2 and 3 are errors in which extra magnetic bubbles spring out caused by the magnetic bubble memory element. FIG. 4 is a plan view of a main part showing an embodiment of a magnetic bubble storage element, particularly a magnetic bubble generation circuit, according to the present invention, and FIG. FIG. 7 is a plan view of main parts showing another embodiment of the method for connecting conductor loops in FIG. 1... Transfer circuit element, 2... Conductor loop, 2a... Hairpin section, 3... Rotating magnetic field (H fact), 4...・Bias magnetic field (HB)
, 5... Conductor loop, 6... Heat dissipation pattern, 7... Conductor pattern, 8a, 8b
・・・・・・Bonding pad.

Claims (1)

[Scope of Claims] 1. A magnetic bubble storage element comprising an element that generates and decomposes magnetic bubbles by passing a pulsed current through a hairpin-shaped conductor loop provided on a magnetic bubble transfer circuit. A magnetic bubble memory element characterized in that a conductor loop is provided with another conductor loop inside the conductor loop. 2. The magnetic bubble memory element according to claim 1, wherein the other conductor loop is connected in series to a hairpin-shaped conductor loop.