Spin-reorientation in ErFeO3:: Zero-field transitions, three-dimensional phase diagram, and anisotropy of erbium magnetism -: art. no. 104429

Spontaneous spin-reorientation transitions in ErFeO3 are studied using ultrasound, magnetic susceptibility, and magnetic moment measurements. The properties of the first-order transition happening in magnetic field sweeps through zero are studied and a three-dimensional (H,T) magnetic phase diagram of the material is constructed. Direct measurements of the magnetic moment allow for a precise determination of the temperature dependence of the magnetization direction in the reorientation region. The mean-field theory of orientation transitions is modified to account for the magnetism of the erbium subsystem, and an excellent agreement with experiment is achieved.