Dynamic and Static Properties of a Non-Heisenberg Ferrimagnet with Single-Ion Easy-Axis Anisotropy

Effect of large single-ion anisotropy on the dynamic and static properties of a non-heisenberg ferrimagnet

“…The model described by Hamiltonian (1) was studied in detail in [52]. But for this model, unlike [52], high singleion anisotropy was addressed (β ≫ J, K).…”

“…The model described by Hamiltonian (1) was studied in detail in [52]. But for this model, unlike [52], high singleion anisotropy was addressed (β ≫ J, K). Moreover, the properties of highly anisotropic ferrimagnet, but without biquadratic exchange interaction, were studied in [34].…”

“…Using the findings of [52], we can omit the description of some mathematical operations and proceed directly to energy states of magnetic ion…”

“…Moreover, this resulting magnetic moment is parallel to the antiferromagnetism vector, and the ferrimagnet behavior in the compensation point can be considered as " antiferromagnetic" [20]. It should be noted that equation (7) or (8) exactly corresponds to the compensation surface equation for weakly anisotropic (β ≪ J < K) non-Heisenberg ferrimagnet [34,52], but taking into account that, in the ferrimagnet with low anisotropy, the quantum spin reduction effect is associated with the presence of biquadratic exchange interaction. In case addressed herein, this effect is attributable to the influence of biquadratic exchange interaction as well as to high " easy plane" single-ion anisotropy.…”

“…Such behavior of the activation energy is specific to antiferromagnets. Therefore, in the vicinity of the compensation line (surface), the non-Heisenberg highly anisotropic ferrimagnet behaves as antiferrimagnet [20,52].…”