JPS624796B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic bubble storage elements, and more particularly to improvements in the magnetic bubble detector field.

A detector is an important functional part that is a component of a magnetic bubble memory element. The detector used to read stored information usually uses a magnetoresistive element that detects the leakage magnetic field from a magnetic bubble, but it is difficult to obtain a magnetic field sufficient for detection with a single circular magnetic bubble. Because this is not possible, the length of the magnetic bubble must be expanded to several hundred times the diameter before detection. Since the detection output increases in proportion to the enlarged length of the magnetic bubble, it is possible to obtain a practical detection output by enlarging the magnetic bubble.
After detection, the expanded magnetic bubble is rejected outside the guardrail.

FIG. 1 shows the magnifier and detector of a conventional magnetic bubble storage element (hereinafter this area will be referred to as the detector area).
In the configuration diagram shown in FIG. 1, a magnetic bubble transferred through a transfer path 1 enters an enlarger 2, is enlarged, and is detected by a detector 3. After being detected, it is rejected outside the guardrail 4.

As can be seen from Figure 1, a guardrail 4 is required to reject the magnetic bubble that has expanded to the length of the detector, which limits the position of the detector area within the element, forcing it to be placed near the periphery of the element. I didn't get it. However, as storage elements have become larger in capacity, their architectures have also become more diverse. For example, in order to achieve high-speed readout, it is necessary to install a detector at any position within the element. The area must be realized.

If this can be achieved, the degree of freedom in element design will increase and it will be possible to prevent performance deterioration due to increased capacity.

It is an object of the present invention to provide a magnetic bubble storage element with a detector area that does not require guardrails.

The present invention provides a magnetic bubble extinguisher made of a conductor in the lower layer of an expander made of a permalloy pattern such as a Chevron expander, and after detection, a current pulse is passed through the extinguisher to extinguish the expanded magnetic bubble. It is achieved by doing so.

The present invention will be explained below using the drawings. FIG. 2 is a block diagram showing a detector area of an embodiment of a magnetic bubble storage element according to the present invention. When the magnetic bubbles transferred from the right side of Figure 2 through the transfer path 1 at a transfer cycle of 10 μsec reach the 50-stage Chevron expander 2 made of a permalloy pattern, they begin to expand one after another and finally expand to the full length of the expander 21. and reaches the detector 3 where it is detected. The detected magnetic bubble is transferred to the subsequent Chevron expander 22, and when it reaches the center of the hairpin-shaped annihilator 5 made of a conductive pattern, the annihilator 4 is arranged so that the vertical bias magnetic field at that part becomes large. A current pulse with a width of 3 μsec is applied to. The magnetic bubble, which had been expanded by the current pulse, shrinks and disappears.

FIG. 3 shows the timing within the cycle of the functional units related to this series of operations. FIG. 3 shows the temporal relationship among the rotating magnetic field, the detection output waveform, the detection strobe pulse, and the current pulse flowing through the annihilator 5 in the above embodiment, which are shown in this order in a, b, c, and d, respectively. .

As explained above, conventionally a guardrail was required to reject detected magnetic bubbles, but according to the present invention, a guardrail is not needed in the detector area by providing an annihilator made of a conductor. It is now possible to place the detector at any position within the memory element. As a result, the degree of freedom in designing the layout of a large-capacity, high-performance magnetic bubble memory element increases, which is industrially beneficial.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a detector area used in a conventional magnetic bubble storage element, FIG. 2 is a configuration diagram of a detector area in a magnetic bubble storage element according to an embodiment of the present invention, and FIG. 3 is a configuration diagram of a detector area used in a conventional magnetic bubble storage element. FIG. 3 is a diagram showing the temporal relationship of the driving states of the magnetic bubble storage element of the example. In the figure, 1... transfer path, 2, 21, 2
2...magnifier, 3...detector, 4...guardrail, 5...extinguisher.

Claims (1)

[Claims] 1. In a magnetic bubble storage element comprising at least a magnetic bubble expander and a detector, a magnetic bubble expanded by the expander made of a permalloy pattern and detected by the detector is transmitted to a trailing position of the detector. A magnetic bubble is extinguished by an extinguisher made of a conductive pattern laid under the expander located at the extinguisher, and a magnetic bubble expander or transfer path is not provided at a position subsequent to the extinguisher. memory element.