Hysteresis behavior of the anisotropic quantum Heisenberg model driven by periodic magnetic field

Abstract: Dynamic behavior of a quantum Heisenberg ferromagnet in the presence of a periodically oscillating magnetic field has been analyzed by means of the effective field theory with two spin cluster. The dynamic equation of motion has been constructed with the help of a Glauber type stochastic process and solved for a simple cubic lattice. After the phase diagrams given, the behavior of the hysteresis loop area, coercive field and remanent magnetization with the anisotropy in the exchange interaction has been investigated in detail. Especially, by comparing of the magnitudes of the hysteresis loop area in the high anisotropy limit (i.e. Ising model) and low anisotropy limit (i.e. isotropic Heisenberg model), detailed description of the hysteresis loop area with the anisotropy in the exchange interaction given. Some interesting features have been obtained about this behavior as well as in phase diagrams such as tricritical points.