The influence of external magnetic fields on phase states and spectra of coupled magnetoelastic waves in a biaxial non-Heisenberg ferromagnetic

Temperature dependence of static and dynamic properties of an anisotropic ferrimagnet

“…However, the single ion anisotropy will have an effect on the temperature behavior of the second sublattice, because the expres sion for the average magnetic field includes . The system of equations (4) and (5) is substantially nonlinear and amenable to analytical treatment only for low temperatures [11,12]. It can be seen from these figures that, at low tem peratures, there is almost no difference between the isotropic and anisotropic cases.…”

“…for which the averaging is performed with the total Hamiltonian (1); and α are the so called root vectors, which are defined by the algebra of the Hubbard oper ators [11,13]. The method used for deriving the dis persion relation is described in detail in [11]; there fore, we immediately turn to the analysis of the mag non spectra.…”

“…The method used for deriving the dis persion relation is described in detail in [11]; there fore, we immediately turn to the analysis of the mag non spectra.…”

“…This effect reaches a maximum for a small integer value of the spin of the magnetic ion S = 1, but, in principle, it is also possible for large val ues of the spin S = 2 [8], as well as for half integer spin S = 3 [9]. The effect of quantum spin reduction is characteristic of magnets with single ion anisotropy of the "easy plane" type, but it is not observed in mag netic materials with single ion anisotropy of the "easy axis" type, which is associated with the struc ture of the ground state [10,11]. As a limiting case of the observation of these effects, we note the existence of the so called nematic phases of a magnet with zero average spin [7][8][9].…”

Longitudinal spin dynamics in nickel fluorosilicate

“…[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Nowadays, many examples are known of the unconventional properties of magnetic materials containing the lanthanide and actinide ions, which also exhibit the effects of spin reduction. 26,27 This unconventional magnetism has been found not only for crystalline magnets, but also for the Bose-Einstein condensates of atoms with a nuclear spin of unity.…”