Induced Giant Magnetoelectric Effect in Ferromagnetic Meta 1/Cr_20_3 Multilayer at Room Temperature

在蓝宝石衬底上生长了磁电（ME） c和r取向的Cr203薄膜。由于4%的晶格失配导致了双晶粒的存在，但表面光滑。r取向薄膜不含双晶，晶粒间存在较深的沟槽以减小晶格应变。由于双晶粒产生相反的ME信号，在定向膜中很难获得巨大的ME效应。然而，通过减少晶格失配，可以在具有原子光滑表面的r取向薄膜中获得巨大的ME效应。

The magnetoelectric(ME) c-and r-oriented Cr203 films grew on sapphiresubstrates. The coriented film showed quite smooth surface, though included twin grain dueto 4% lattice mismatch. The r-oriented film did not include twin grain, and showeddeep trench between grains to reduce lattice strain. Since the twin grain generatean opposite ME signal, it is difficult to obtain giant ME effect in coriented film. However, it is possible to obtain giant ME effect in r-oriented film with atomically smooth surface by reducing the lattice mismatch.