New Trends in Physical Science Research Vol. 3

Abstract

A comparative study of domain wall pinning in lithium ferrite under the action of low-frequency and pulsed magnetic fields was made for the first time.

The strong effect of modulation of the echo signal decay envelope in lithium ferrite under the influence of a weak low-frequency magnetic field has been observed and used for evaluation of domain wall pinning force. This effect in lithium ferrite is caused, in difference to cobalt, by a large domain wall mobility in this material. For comparison the domain wall pinning force was also evaluated using the influence of additional magnetic videopulse on two-pulse echo signal by causing the reduction of echo signal intensity at a domain wall displacement under its influence.

It is shown that the estimation of the domain wall pinning force by low-frequency field modulation method is consistent with one, obtained by the action of additional magnetic video pulse on the intensity of two-pulse echo in lithium ferrite.