Abstract
Temperature dependence of the magnetizations were revisited in Mn-doped perovskite rare-earth ferrites RFe1-xMnxO3 (R=Ho and Tb). The spin reorientation of these materials shows a magnetic phase transition from Γ4(Gx,Ay,Fz) to Γ1(Ax,Gy,Cz), contrast to that of parent HoFeO3 and TbFeO3. This transition can not only be distinct for single crystals but also obvious for polycrystals. The Γ4→Γ1 transition temperature can be modified from quite low temperature (50K for HoFeO3 and 8.5K for TbFeO3) to near room temperature by adjusting different Mn concentration. Above the transition temperature, the Mn doped materials show weak ferromagnetic state while below it appears an antiferromagnetic state. By repeating warming and cooling process, the magnetization route presents recurrent coincidence. These revealed advantages of controllable transition temperature and the repeatability of remarkable switch between ferromagnetic state and antiferromagnetic state, may provide a feasible way to develop the temperature sensitive spintronics device.
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