Open AccessНегейзенберговский ферримагентик с одноионной анизотропией
Author(s) -
О.А. Космачев,
Е.А. Ярыгина,
Я.Ю. Матюнина,
Ю.А. Фридман
Publication year - 2022
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2022.03.52094.235
Subject(s) - ferrimagnetism , condensed matter physics , spins , anisotropy , physics , heisenberg model , phase diagram , isotropy , magnetocrystalline anisotropy , exchange interaction , phase (matter) , exchange bias , antiferromagnetism , magnetic anisotropy , ferromagnetism , magnetization , quantum mechanics , magnetic field
We have investigated the effect of single-ion anisotropy of the "easy plane" type on the phase states of a ferrimagnet with S = 1 and σ=1/2 sublattices and non-Heisenberg (bilinear and biquadratic in spins) exchange interaction for the sublattice with S = 1. It is shown that taking into account both the non-Heisenberg exchange interaction and the single-ion anisotropy of the sublattice with S = 1 leads to the realization of a phase with vector order parameters (ferrimagnetic phase) and a phase characterized by both vector and tensor order parameters (quadrupole-ferrimagnetic). It is shown that taking into account single-ion anisotropy changes the type of phase transition in comparison with an isotropic non-Heisenberg ferrimagnet. A phase diagram is constructed, and the condition for the compensation of the sublattice spins is determined.