Open AccessОсобенности релаксации остаточной намагниченности антиферромагнитных наночастиц на примере ферригидрита
Author(s) -
Д.А. Балаев,
А.А. Красиков,
А.Д. Балаев,
С.В. Столяр,
В.П. Ладыгина,
Р.С. Исхаков
Publication year - 2020
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2020.07.49469.038
Subject(s) - condensed matter physics , magnetization , remanence , exchange bias , relaxation (psychology) , antiferromagnetism , ferrihydrite , materials science , anisotropy energy , stoner–wohlfarth model , magnetic anisotropy , superparamagnetism , magnetic moment , anisotropy , magnetic field , chemistry , physics , psychology , social psychology , organic chemistry , adsorption , quantum mechanics
In this work, we studied the relaxation of the remanent magnetization of antiferromagnetically ordered ferrihydrite nanoparticles under the conditions of realization of the exchange bias effect for these systems. Magnetization relaxation is characterized by a logarithmic dependence on time, which is typical for thermo-activation processes of the hopping of the magnetic moment of particles through potential barriers caused by magnetic anisotropy. The energy of the barriers obtained from processing the data on relaxation of the remanent magnetization (under the conditions of field cooling) significantly exceeds that for ordinary conditions (zero field cooling). The observed difference indicates the possibility of using the residual magnetization relaxation process to analyze the mechanisms responsible for the effect of exchange bias in antiferromagnetic nanoparticles and obtain the parameters characterizing the exchange coupling of magnetic subsystems in such objects.