Impurity effects in multiferroic compounds

Details Impurity effects in multiferroic compounds Impurity effects in multiferroic compounds

2009-03-07

arxiv.org/abs/0903.1319v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

We investigate the effect of impurities in multiferroic materials using an equation of motion approach for the spin dynamics of the host multiferroic compound. We model the impurities as a two-level system and focus on the regime where the impurity spins relax slowly. When the impurity strength is weak the host spins oscillate with no decay and the electric polarization is not affected. However as the impurity strength is increased the host spin components get damped and the electrion polarization is suppressed. Since polarization in multiferroic materials is driven by magnetic ordering we conclude that the presence of impurities is detrimental to multiferroicity.

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