Unraveling the Nature of Thermally Induced Spin Reorientation in NdFe1-x Cr x O3 (x=0.1 and 0.9)

Understanding spin control mechanisms is crucial in condensedmatterphysics and serves as a theoretical foundation for designing spintronicdevices. In this paper, we propose that the primary magnetic mechanismin NdFe1-x Cr x O3 is driven by temperature-sensitive spin reorientation,based on a four-sublattice molecular field theory. The actual couplingangular momentum, as well as the angle between the Nd3+ and Fe3+/Cr3+ moments at a given temperature,is achieved through the projection of the Nd3+ magneticmoment onto the Fe3+/Cr3+ plane. As the temperatureincreases, the angle between the Nd3+ moment and the Fe3+/Cr3+ moment decreases monotonically. In thisstudy, we present the magnetic mechanism of NdFe1-x Cr x O3 (x = 0.1 and 0.9) and the close relationship between theA/B angle and temperature, which establishes a theoretical basis fordesigning new multifunctional magnetic materials.