SU1124759A1 - Method of inspecting man information carriers - Google Patents

Abstract

METHOD OF CONTROL OF MAGNETIC MEDIA OF INFORMATION based on excitation of magnetization oscillations in it and registration of resonant oscillations of magnetization, which, in order to reduce the control time, excitation of oscillations of magnetization in the information carrier is carried out by fixed-frequency radio emission field with a varying intensity from 20 to 2000 Oe, and the registration of resonant oscillations of the magnetization is carried out simultaneously with the change in the intensity of the constant gnitnogo floor of

Description

The invention relates to computing and can be used to control and reject film carriers used in radio signal storage and processing devices.

There is a known method of controlling the magnetostriction constant and the field of the induced anisotropy of magnetic films by exciting low-frequency oscillations of magnetization in them, detecting an excited signal and register- ing; his walkie talkies

The disadvantage of this method is low reliability.

The closest to the technical essence of the present invention is a method of controlling magnetic information silos, which consists in exciting oscillations of a carrier material at frequencies of 30-250 MHz, detecting an excited signal, registering a signal;

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spectrum to determine the performance of the carrier information line width and intensity of the resonant signal - and the rejection of the media according to these parameters Dp increase the sensitivity of measurements of the information carrier for the time control is placed in a vessel with liquid

tsD helium and cooled to 4.2 K

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The disadvantage of this method is sj with a large time control, associated

If it is necessary to cool down, carry it; about the data to the temperature of the liquid gels and the complexity of the numerical processing of the spectral

The purpose of the invention is to reduce the vrag of control of magnetic media.

information

The goal is achieved by the fact that in the method of controlling magnetic information carriers, based on the excitation of magnetization oscillations in it and the registration of resonant oscillations of magnetization.

magnetization oscillations in the information carrier are excited by radio emission of a fixed frequency and a constant magnetic field with a varying intensity from 20 to 2000 Oe, and registration of resonant oscillations of the magnetization is carried out simultaneously with a change in the intensity of the constant magnetic field

The method is implemented as follows

The data carrier is placed in the resonator of the radio spectrometer, oscillations of the magnetization are excited at a frequency of 9.4 GHz, the resonator with the carrier is placed between the poles of the electromagnet, the field in which varies from 20 to 2000 Oe, the excited signal is detected and recorded on a two-coordinate recorder

The reference signal is a suitable carrier of information, consisting of one maximum of resonance absorption. The signal of a defective carrier contains more than one maximum of resonance absorption, I

The use of this method of controlling magnetic storage media reduces the monitoring time by 10 to 20 times.

Claims (1)

METHOD FOR CONTROL magnetic storage media, based on the excitation of the vibrations of magnetization and magnetization registration resonant oscillations of m and l - _{sistent in that, in order to reduce the control time, the excitation of oscillations of the magnetization in the recording medium is carried out radio waves of fixed frequency and constant a magnetic field with a varying intensity from 20 to 2000 Oe, and the registration of resonant oscillations of the magnetization is carried out simultaneously with a change in the intensity of a constant oh field ₀