Abstract
Thermodynamical expressions are derived to calculate isentropic magnetoelectric and electromagnetic couplings in ferroelectric/ferromagnetic heterostructures. The expressions predict that the isentropic magnetoelectric and electromagnetic effects are reversible and comparable in magnitude and can be tuned in different ways. The expressions are applied to estimate isentropic couplings in commonly grown planar heterostructures of La0.7Sr0.3MnO3/Ba1-xSrxTiO3 and La0.7Ca0.3MnO3/Ba1-xSrxTiO3 with x= 0.0, 0.1, and 0.5 using a combination of first-principles computational data and experimental data from the literature. The isentropic coupling coefficients of up to 10−9 s/m are predicted close to room temperature for La0.7Ca0.3MnO3/BaTiO3 heterostructures. Our findings show a way to tune the isentropic coupling coefficients in a particular temperature range by engineering heterostructures with favorable transition temperatures.
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