Spin-reorientation magnetic transitions in Mn-doped SmFeO.

Spin reorientation is a magnetic phase transition in which rotation of the magnetization vector with respect to the crystallographic axes occurs upon a change in the temperature or magnetic field. For example, SmFeO shows a magnetization rotation from the axis above 480 K to the axis below 450 K, known as the Γ → Γ transition. This work reports the successful synthesis of the new single-crystal perovskite SmFeMnO and finds interesting spin reorientations above and below room temperature. In addition to the spin reorientation of the Γ → Γ magnetic phase transition observed at around = 382 K, a new spin reorientation, Γ → Γ, was seen at around = 212 K due to Mn doping, which could not be observed in the parent rare earth perovskite compound. This unexpected spin configuration has complete antiferromagnetic order without any canting-induced weak ferromagnetic moment, resulting in zero magnetization in the low-temperature regime. - and - measurements have been made to study the temperature and magnetic-field dependence of the observed spin reorientation transitions.