Continuous spin reorientation in antiferromagnetic films
  We study anisotropic antiferromagnetic one-layer films with dipolar and nearest-neighbor exchange interactions. We obtain a unified phase diagram as a function of effective uniaxial D_e and quadrupolar C anisotropy constants. We study in some detail how spins reorient continuously below a temperature T_s as T and D_e vary. 
J.J.Alonso (1), J.F.Fernandez (2), ((1) Universidad de Malaga, Spain,   (2) CSIC and Universidad de Zaragoza, Spain)