Effect of Transition Metal Doping on Multiferroic Ordering in FeV O 4
Kumarasiri A, Abdelhamid E, Dixit A, and Lawes G. Effect of transition metal doping on multiferroic ordering in FeVO4. Physical Review B 2015; 91(1):6.
Physical Review B
FeVO4 is a multiferroic that undergoes two antiferromagnetic transitions at TN1∼21K and TN2∼15K, with a small ferroelectric polarization developing at the 15-K transition. We have studied the effect of magnetic and nonmagnetic transition metal dopants on these magnetic phase transitions in order to investigate the microscopic mechanisms for magnetoelectric coupling in this system as well as probing the evolution of the phase transitions. We have synthesized polycrystalline Fe1−xTMxVO4(TM=Zn,Cr,Mn) samples up to x=0.2 and studied dynamics of these two ferroic phase transitions using thermodynamic, magnetic, and pyrocurrent measurements. We find that the magnetic ordering temperatures in FeVO4 are remarkably stable, showing only a minimal suppression in transition temperatures even for larger doping fractions. We also observe clear reversible polarization at x=0.05 for all samples, which also persists to the largest doping for Zn, suggesting that the multiferroic order persists over a large range of compositions.