6533b855fe1ef96bd12b11b6
RESEARCH PRODUCT
Free Charge Carriers in Mixed Valency Oxides as Possible Mediators of Magnetoelectric Effect
Vladimir A. StephanovichMaya D. GlinchukR. Blincsubject
RKKY interactionMaterials scienceCondensed matter physicsMagnetoelectric effectCondensed Matter PhysicsFerroelectricityElectronic Optical and Magnetic MaterialsCondensed Matter::Materials ScienceDipoleFerromagnetismCondensed Matter::Strongly Correlated ElectronsCharge carrierMultiferroicsSpin-½description
We show, that in a substance with mixed-valence ions, which can supply free carriers and have electric dipole and spin moments, three types of long-range order (ferromagnetic, ferroelectric and magnetoelectric (ME)) can occur at low temperatures. The origin of the effect is that free charge carriers can mediate the multiferroic behavior via spin – spin (RKKY), dipole-dipole and dipole - spin interactions. We show that there is an optimal carrier concentration, at which the strength of ME interaction is maximal and comparable to that of RKKY interaction. Our analysis shows that disorder and finite conductivity in the above substances does not suppress multiferroic effects.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-10-27 | Ferroelectrics |