6533b7d7fe1ef96bd126871e

RESEARCH PRODUCT

Magnetoelectric effect in mixed valency oxides mediated by charge carriers

Maya D. GlinchukVladimir A. StephanovichR. Blinc

subject

Condensed Matter - Materials ScienceMaterials scienceRKKY interactionSpinsCondensed matter physicsMagnetoelectric effectGeneral Physics and AstronomyMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciencesDisordered Systems and Neural Networks (cond-mat.dis-nn)Condensed Matter - Disordered Systems and Neural NetworksFerroelectricityDipoleCondensed Matter::Materials ScienceFerromagnetismMultiferroicsCharge carrierCondensed Matter::Strongly Correlated ElectronsComputer Science::Databases

description

We show that the presence of free carriers in a substance can generate the multiferroic behavior. Namely, if the substance has mixed-valence ions, which can supply free carriers and have electric dipole and spin moments, all three types of long-range order (ferromagnetic, ferroelectric and magnetoelectric (ME)) can occur at low temperature. The physical origin of the effect is that charge carriers can mediate the multiferroic behavior via spin - spin (RKKY), dipole-dipole and dipole - spin interactions. Our estimate of the interaction magnitude shows that there exist an optimal carrier concentration, at which the strength of ME interaction is maximal and comparable to that of spin-spin RKKY interaction. This permits to conclude that in substances, where RKKY interaction between local spins is not small, a substantial value of free carriers mediated ME interaction can occur. Our analysis shows that disorder in the above substances does not suppress multiferroic effects.

yearjournalcountryeditionlanguage
2008-03-16
https://dx.doi.org/10.48550/arxiv.0803.2233