Current-induced exchange interactions and effective temperature in localized moment systems
We study theoretically the spin dynamics of a magnetic dimer serving as a contact between two electrodes. We find that the spin-spin coupling in the dimer can be dramatically modified from its equilibrium value. We show that the interaction can be tuned in such a way that it effectively changes its sign. The calculations show that, for large enough bias, the exchange interaction can even be changed from antiferromagnetic to ferromagnetic. The physical principles behind this result can be used as a new tool to achieve magneto-electric effects in molecular magnet systems.
Proyecto Fondecyt 11070008 1110271 Proyecto Basal FB0807-CEDENNA Nucleo Cientifico Milenio P10-061-F
DOI: DOI: 10.1088/0953-8984/24/11/116001
Quote ItemJOURNAL OF PHYSICS-CONDENSED MATTER Volume: 24 Issue: 11 Article Number: 116001 Published: MAR 21 2012