Tuning of spin reorientation temperature of SmFeO₃: Role of exchange interaction between 4f & 3d electrons

Emergent technologies based on spintronics demand the unprecedented control on magnetic anisotropy. Here we present the control on magnetic anisotropy of SmFeO₃ by the means of Tm³⁺doping at Sm³⁺site. A series of nano particles of Sm_1-xTm_xFeO₃ (X=0, 0.3, 0.5, 0.7, 1) orthoferrite have been synthesized by sol-gel auto-combustion method and phase purity was confirmed by the X-ray diffraction pattern. The crystallographic information obtained from Rietveld refinement and Raman spectroscopy confirmed the changes in oxygen octahedra with the change in doping percentage of Tm³⁺ ion in SmFeO₃. Temperature dependent dc magnetization measurement implies the tuning of spin reorientation temperature from 480 K to 80 K as a function of Tm³⁺ ion doping concentration. The room temperature magnetic isotherm confirms the canted antiferromagnetic character of nano particles. Sm_0.7Tm_0.3FeO₃ shows the spin reorientation at room temperature which might be used in room temperature spintronics devices.

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