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

Authors

  • 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.

DOI:

https://doi.org/10.9734/bpi/ntpsr/v3/2267B

Keywords:

Nuclear spin echo, low-frequency field, lithium ferrite, domain wall mobility, pinning, videopulse

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.

   

Author Biographies

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

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.

 

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.

 

   

Published

2022-05-16

How to Cite

Grigor Mamniashvili, Tatiana Gegechkori, & Tsisana Gavasheli. (2022). NMR Study of the Domain Wall Pinning in Lithium Ferrite under the Influence of Low-frequency and Pulsed Magnetic Fields. New Trends in Physical Science Research Vol. 3, 60–71. https://doi.org/10.9734/bpi/ntpsr/v3/2267B

Issue

New Trends in Physical Science Research Vol. 3

Section

Chapters