Effect of Ti⁴⁺ Substitution on Microstructure and Magnetic Order of Ca₃CoMn_1-xTi _xO₆

The Ca₃CoMn_1-xTi_xO₆(x = 0, 0.05) samples were synthesized by a modified sol-gel method, and the microstructure, microtopography, and magnetic properties were investigated in detail. With substituting of Mn⁴⁺ ions by Ti⁴⁺ ions, the crystallinity and particle size of Ca₃CoMn_1-xTi_xO₆ (x = 0, 0.05) samples decrease. The Ti⁴⁺ doping also causes the high-temperature spin freezing phenomenon disappears, and the transition field of ↑↑↓↓ magnetic structure to ↑↑↑↓ magnetic structure increases obviously together with the faster dynamic behavior. These results suggest that the dilution effect of Ti⁴⁺ doping to Co-Mn-Co-Mn spin chains could reduce the degree of magnetic frustration and suppress the formation of short range magnetic order, for which will be beneficial for the establishment of more robust long range antiferromagnetic structure. The present research could serve as a reference on tuning the magnetic order and improving the multiferroic property of Ca₃CoMnO₆.