Cation-ordered A${}_{1/2}^{\prime }$A${}_{1/2}^{\prime \prime }$B${}_2$X${}_4$ magnetic spinels as magnetoelectrics

Abstract

We show that 1:1 ordering of A${}^{\prime }$ and A${}^{\prime \prime }$ cations in A${}_{1/2}^{\prime }$A${}_{1/2}^{\prime \prime }$B${}_2$X${}_4$ magnetic spinels results in appearance of magnetoelectric properties. Possible value of magnetically induced electric polarization is calculated using the recently proposed microscopic model, which takes into account spin-dependent electric dipole moments of magnetic ions located in noncentrosymmetric crystallographic positions. We build phenomenological models of magnetic phase transitions in cation-ordered spinels, which describe ferromagnetic and antiferromagnetic ordering patterns of B cation spins, and calculate the respective magnetoelectric responses. We find that magnetoelectric coefficients diverge at ferromagnetic or weak ferromagnetic phase transitions in ordered spinels.

9 pages, 2 figures

References in corpus (3)

• Dielectric anomalies and spiral magnetic order in CoCr2O4
• Spin and Orbital Order of the Vanadium Spinel MgV2O4
• Magnetoelectric effect due to local noncentrosymmetry

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