Doping tuned spin reorientation and spin switching in praseodymium- samarium orthoferrite single crystals.

We investigate the detailed analysis of the magnetic properties in a series of Pr1-xSmxFeO3 single crystals from x = 0 to 1 with an interval of 0.1. Doping controlled spin reorientation transition temperature TSR Γ4 (Gx, Ay, Fz) to Γ2 (Fx, Cy, Gz) covers a wide temperature range including room temperature. A "butterfly"-shape type-Ⅰ spin switching with 180° magnetization reversal occurs below and above the magnetization compensation points in x = 0.4 to 0.8 compounds. Interestingly, in Pr0.6Sm0.4FeO3 single crystal, we find an inadequate spin reorientation transition accompanied by uncompleted type-Ⅰ spin switching in the temperature region from 138 to 174 K. Furthermore, a type-Ⅱ spin switching appears at 23 K, as evidenced from the magnetization curve in FCC (field-cooled-cooling) mode initially bifurcate from ZFC (zero-field-cooled) magnetization curve at 40 K and finally drops back to coincide the ZFC magnetization value at 23 K. Our current research reveals a strong and complex competition between Pr3+- Fe3+ and Sm3+-Fe3+ exchange interactions and more importantly renders a window to design spintronic device materials for future potential applications.