Strong ferromagnetic-dielectric coupling in multiferroic Lu2CoMnO6 single crystals

摘要

We have grown single crystals of multiferroic double-perovskite Lu2CoMnO6 andstudied the directional dependence of their magnetic and dielectric properties.The ferromagnetic order emerges below TC ~ 48K along the crystallographic caxis. Dielectric anomaly arises along the b axis at TC, contrary to thepolycrystalline work suggesting ferroelectricity along the c axis. Through thestrongly coupled ferromagnetic and dielectric states, the highly non-linearvariation of both dielectric constant and magnetization was achieved inapplication of magnetic fields. This concurrent tunability provides anefficient route to manipulation of multiple order parameters in multiferroics.