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Composite multiferroics are materials exhibiting the interplay offerroelectricity, magnetism, and strong electron correlations. Typical example--- magnetic nano grains embedded in a ferroelectric matrix. Coupling offerroelectric and ferromagnetic degrees of freedom in these materials is due tothe influence of ferroelectric matrix on the exchange coupling constant viascreening of the intragrain and intergrain Coulomb interaction. Cooling typicalmagnetic materials the ordered state appears at lower temperatures than thedisordered state. We show that in composite multiferroics the ordered magneticphase may appear at higher temperatures than the magnetically disordered phase.In non-magnetic materials such a behavior is known as inverse phase transition.

Coupling of (ferro)electricity and magnetism through Coulomb blockade in Composite Multiferroics