The effect of transverse magnetic correlations on a coupled order parameter: shifted transition temperatures and thermal hysteresis

Details The effect of transverse magnetic correlations on a coupled order parameter: shifted transition temperatures and thermal hysteresis The effect of transverse magnetic correlations on a coupled order parameter: shifted transition temperatures and thermal hysteresis

2009-11-09

arxiv.org/abs/0911.1600v1

Phys. Rev. B 81, 064403 (2010)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.81.064403

We use a Green's function method with Random Phase Approximation to show how magnetic correlations may affect electric polarization in multiferroic materials with magnetic-exchange-type magnetoelectric coupling. We use a model spin 1/2 ferromagnetic ferroelectric system but our results are expected to apply to multiferroic materials with more complex magnetic structures. In particular, we find that transverse magnetic correlations result in a change in the free energy of the ferroelectric solutions leading to the possibility for thermal hysteresis of the electric polarization above the magnetic Curie temperature. Although we are motivated by multiferroic materials, this problem represents a more general calculation of the effect of fluctuations on coupled order parameters.

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