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.
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