SU600613A1 - Storage for associative memory - Google Patents

Description

light intensity over the entire storage area. Polarizer 3 polarizes the transmitted light. The thickness of the plate 6 can be quite large (0.3-0.5 mm), therefore there is no noticeable magnetostatic interaction between films 5 and 7 and they can be magnetized arbitrarily.

Suppose that the thickness and magnetic characteristics of films 5 and 7 coincide and the polarization axis of the polarizer 3 system — analyzer 8 are mutually perpendicular. If both films 5 and 7 are magnetized upward along the light axis (position 15 in Fig. 1), then after the passage of light through both films 5 and 7, the polarization vector deviates by an angle of 29 /, where 6 is the specific Faraday rotation in degrees / cm and t is the thickness of each layer in cm. Pa. The output of the analyzer 8 in this case is a component of light intensity

/ i / oe- sin22e,

where / o is the intensity of polarized light incident on the film;

a is the absorption coefficient of the film, including the intensity loss when passing through the substrate.

The same light intensity will be observed after passing through the analyzer 8 if both films 5 and 7 are magnetized down along the easy axis. Only in this case the polarization vector will rotate counterclockwise by an angle of 26 (on fit. 1 position. 16).

Another possible case. Film 5 has magnetization directed upward along the light axis, and film 7 along the light axis downward. After passing through both films 5 and 7, the light polarization vector should not change its direction, i.e. it should remain directed along the input polarization axis (position 17 in Fig. 1). For ideal conditions in this case, the output of the analyzer 8 should not be observed any passage of light.

P, finally, such a distribution of magnetization is possible, when the film 5 has a magnetization directed downwards and the film 7 is directed upwards (position 18 in Fig. 1). As in the previous case, this distribution will not lead to rotation of the polarization vector. It will remain directed along the axis of polarization 3, and there will be no luminous flux at the output of the analyzer 8.

For the case when the films 5 and 7 are carriers of the survey stored information, and the light 9 that passes through the analyzer 8 represents the output signal, a logical mismatch is performed, i.e. an associative search of information is possible in such a storage device. For example, if the direction of magnetization of the film 5 upwards coincides with a poll for compliance with “O and direction

the magnetization of the film 7 upwards corresponds to storage "I, then the output of the output is a useful output signal in the form of a light flux of intensity / (see Fig. 1 position 15), which can be fixed by the photo-receiver 10 (by LED, phototriode, etc.). The same useful signal will also be found in the case of storing "O and polling for compliance with" 1, when the magnetizations in both films 5 and 7 are directed downwards (see Fig. 1 position 16).

In the other two cases, which correspond to the survey “On for compliance with“ About and survey ”1 for compliance with“ 1 (see FIG. 1 positions 17 and 18), the magnetization in both films 5 and 7 is directed oppositely, and the input Photoreceiver 10 receives a slight interference due to the quality of the system polarizer 3 - analyzer 8, the non-identical parameters of the films 5 and 7. Thus, when polarized light passes through the drive, a logical inconsistency operation is performed, where A is stored information, B is polled, and C-result of logical operations and.

The necessary directions of magnetization in the film 5 are created by means of magnetic fi elds created by the currents flowing through the tires 4, and the floor of the mixture of Him applied to the entire drive. If no current flows in any of in 4, then under the action of Yasm, the entire film 5 has a magnetization vector directed downwards. If a current flows in one of the tires, then it creates a magnetic field that in the area where the tires are located changes the magnetization pattern to the opposite. This corresponds, for example, to positions 15 and 17 in FIG. 1. The excitation of the currents in the tires 4 is controlled by the formers 12, which are excited by the ons of the onros sign. If the interrogation flag in this bit contains "O", then the shaper 12 corresponding to this bit generates a current and the part of the film 5 located under the bus 4 of this bit is re-magnetized. If the polling flag in this bit contains "1, then the shaper 12 is not excited and the corresponding part of the film 5 remains magnetized in the direction of application of the field Jsm. In the film 7, information can be recorded as separate isolated domains opposite to the rest of the magnetization layer. Generation, advancement, and anillation of cylindrical magnetic domains (CMD) can be installed at any position in film 7.

A technique for ion implantation of the promotion of CMD, which does not prevent the full passage of the light flux 9 through the CMD film 7, is known. After polling the accumulator on any basis, block 13 interrogates the detectors I. Those detectors that remained in the original state of the scientific research institute store words that coincide with the indication of the interrogation. In this way, an associative search and selection of information stored in the accumulator corresponding to a particular attribute of the survey takes place.

The proposed drive for an associative memory device on magnetic domains is of greater reliability, since it uses solid-state magneto-optical matrices for both the interrogation part and the indicative part of the storage device. In addition, the magnetic domains have a high radiation resistance, the accumulator uses stable in time states of a magnetically uniaxial material.

Claims (1)

Invention Formula Drive for associative memory device containing transparent a plate, on both sides of which a thin magnetic films made of a magnetically uniaxial material with a light axis of magnetization directed perpendicular to the plane of the plate, are deposited, a film analyzer of propagation of transmitted light fixed on one of the thin magnetic films, formers of current polling pulses and detectors, characterized in that, in order to increase the reliability and simplify the accumulator, it contains conductive buses, one ends of which are connected to the outputs of the formers of current interrogation pulses, and others - to the zero potential bus, located on another thin magnetic film, and film photo-detectors installed on the film analyzer polarization of transmitted light and connected to the corresponding detectors. lg L