Microscopic origin of Magnetic Ferroelectrics in Nonlinear Multiferroics

Details Microscopic origin of Magnetic Ferroelectrics in Nonlinear Multiferroics Microscopic origin of Magnetic Ferroelectrics in Nonlinear Multiferroics

2007-05-07

arxiv.org/abs/0705.0955v3

Phys. Rev. Lett 100, 077202 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.100.077202

A simple but general microscopic mechanism to understand the interplay between the electric and magnetic degrees of freedom is developed. Within this mechanism, the magnetic structure generates an electric current which induce an counterbalance electric current from the spin orbital coupling. When the magnetic structure is described by a single order parameter, the electric polarization is determined by the single spin orbital coupling parameter, and the material is predicted to be a half insulator. This mechanism provides a simple estimation of the value of ferroelectricity and sets a physical limitation as well.

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