Disentangling Highly Asymmetric Magnetoelectric Effects in Engineered Multiferroic Heterostructures
Enric Menéndez, Veronica Sireus, Alberto Quintana, Ignasi Fina, Blai Casals, Rafael Cichelero, Mikko Kataja, Massimiliano Stengel, Gervasi Herranz, Gustau Catalán, Maria Dolors Baró, Santiago Suriñach, and Jordi Sort. Phys. Rev. Applied 12, 014041 – Published 23 July 2019.
One of the main strategies to control magnetism by voltage is the use of magnetostrictive-piezoelectric hybrid materials, such as ferromagnetic-ferroelectric heterostructures. When such heterostructures are subjected to an electric field, piezostrain-mediated effects, electronic charging, and voltage-driven oxygen migration (magnetoionics) may simultaneously occur, making the interpretation of the magnetoelectric effects not straightforward and often leading to misconceptions. We show that asymmetric polarization reversal effects in the piezoelectric material results in asymmetric dependence of magnetization on electric field, which is in principle not expected in a strain-mediated magnetoelectric system.
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