SU1048514A1 - Process for writing and reading data from multiaxis magnetic material plate - Google Patents

Abstract

A METHOD FOR RECORDING AND READING INFORMATION FROM A PLATE OF A MAGNETOMOTICAL MATERIAL, including the stabilization of the plate temperature, the subsequent effect on the plate perpendicular to the surface of the plate by a constant magnetic field, the local heating of the plate and the subsequent irradiation of the plate with an illuminated irradiated pattern of an illuminated irradiated by a solar panel and an infrared light. , characterized by the fact that, since cc to increase the writing speed j, the readability of information is readily applied to the plate before local heating the cosiness is parallel to its surface by a magnetic field along one of its crystallographic axes, and the registration of a change in the light transmitted through the plate is carried out by measuring the spectral content (L of the light passing through its light sections.

Description

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It is invented to computer technology and can be used in computer memory devices.

The known method of thermomagnetic recording and reading information, based on the heating of the magnetostrictive material tj.

The non-residue of the known method is small nationality.

The closest to the technical essence of the invention is a method in which when recording information on a ferrite-garnet plate with an easy magnetization axis perpendicular to the plate surface, the magnetic field perpendicular to the plate surface is heated and the plate is heated with a directed energy flow. When sci. In order to record information, a local change in the optical transparency of the plate 2 is recorded.

The disadvantages of the pan method are the unsatisfactory speed of writing information and the accuracy of reading information is low.

The aim of the invention is to increase the recording speed and read accuracy of information.

This goal is achieved by the fact that according to the method of recording and reading information from a plate of a magneto-goos material, including stabilizing the plate's temperature, subsequent exposure of the plate to a constant-magnetic field perpendicular to its surface, local heating of the plate and subsequent irradiation of the plate with polarized light and registering the light transmitted through the plate, the plate before local heating is additionally affected by a magnetic field parallel to its surface along one her crystallograph

the axial axis, and the registration of the change in the light transmitted through the plate is carried out by measuring the spectral composition of the light transmitted through its plate.

The drawing schematically shows cartoon domains in different orientations of magnetization.

The essence of the proposed method is as follows. . Cylindrical map domains in a pseudo-uniaxial material can be multiplet, i.e., they have several stable states characterized by different orientation of the magnetization vector. Magnetic field directed perpendicular to the plate surface. forms multiplet domains (Fig. 1o). When a magnetic field is applied to the plate, parallel to its surface and oriented along one crystallographic axis, the HaMarHHieH vector of the multiplet domains deviates to one of the easy magnetization axes (Fig. Ib). When the plate is heated, the domain magnetization vector, subjected to heat, returns to its previous position (Fig. I c). Thus, the application of a magnetic field transfers the domain from state A to state B, and local heating to state A. State A corresponds to the entry of a logical unit, and state B corresponds to a logical zero.

It is most advisable to read information on the change in the spectral composition of the light passing through the plate, since the multiplet domains have a different color depending on the orientation of the magnetization vector in them with a constant color of the observation field.

The present invention allows to significantly increase the speed of recording and the accuracy of reading information.

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Claims (1)

. METHOD FOR RECORDING AND READING INFORMATION FROM A MAGNETIC AXIS MATERIAL PLATE, including stabilization of the plate temperature, subsequent exposure of the plate to a constant magnetic field perpendicular to its surface, local heating of the plate, and subsequent irradiation of the plate with polarized light and registration of changes in the light transmitted through the plate, which differ In order to increase the recording speed # the reliability of reading information, the plate is additionally affected by parallel Yelnia its surface magnetic field along one crystallographic axis and changes the light passing through the registration plate is carried out by measuring the spectral composition it has passed through the beam portions.