NMR Study of the Domain Wall Pinning in Lithium Ferrite under the Influence of Low-frequency and Pulsed Magnetic Fields

For the first time, a comparison of domain wall pinning in lithium ferrite under the influence of low-frequency and pulsed magnetic fields was conducted.

The strong effect of modification of the echo signal decay envelope in lithium ferrite under the influence of a mild low-frequency magnetic field has been noticed and exploited for domain wall pinning force measurement. In contrast to cobalt, this phenomenon in lithium ferrite is driven by the material’s high domain wall mobility. For comparison, the domain wall pinning force was assessed utilising the effect of an extra magnetic videopulse on a two-pulse echo signal by creating a decrease in echo signal strength at a domain wall displacement.

It is demonstrated that the low-frequency field modulation method’s calculation of the domain wall pinning force is compatible with one derived by the influence of an extra magnetic video pulse on the intensity of a two-pulse echo in lithium ferrite.

Author(s) Details:

Grigor Mamniashvili,
Department of Condensed Matter Physics, Ivane Javakhishvili Tbilisi State University Andronikashvili Institute of Physics, 6 Tamarashvili St. 0177, Tbilisi, Georgia.

Tatiana Gegechkori,
Department of Condensed Matter Physics, Ivane Javakhishvili Tbilisi State University Andronikashvili Institute of Physics, 6 Tamarashvili St. 0177, Tbilisi, Georgia.

Tsisana Gavasheli,
Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, 1, Chavchavadze Av., Tbilisi, 0179, Georgia.

Please see the link here: https://stm.bookpi.org/NTPSR-V3/article/view/6826

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