Hysteresis behavior of the anisotropic quantum Heisenberg model
  The effect of the anisotropy in the exchange interaction on the hysteresis loops within the anisotropic quantum Heisenberg model has been investigated with the effective field theory for two spin cluster. Particular attention has been devoted on the behavior of the hysteresis loop area, coercive field and remanent magnetization with the anisotropy in the exchange interaction for both ferromagnetic and paramagnetic phases. 
\"Umit Ak{\i}nc{\i}
cond-mat.stat-mech