Giant room-temperature modulation of magnetic anisotropy by electric fields in CoFeB/(011)-PMN-PT multiferroic heterostructures with two distinct initial magnetic anisotropies

This paper reports that the in situ growth magnetic field (Hg) during magnetic-phase CoFeB deposition impacts electric-field control of anisotropy Co40Fe40B20/(011)-Pb(Mg1/3Nb2/3)0.7Ti0.3O3 [CoFeB/(011)-PMN-PT] composite multiferroic heterostructures at room temperature. In Hg1 mode (in Hg along [011¯] direction ferroelectric PMN-PT substrate), electric-field-controlled modulation ratios coercivity HC and saturation HS are approximately −47% +156%, respectively. However, Hg2 [100] substrate) CoFeB/(011)-PMN-PT heterostructure, can reach as high +162% +393%, Moreover, coercive exhibits a butterfly shape when plotted versus applied electric fields both modes, which matches in-plane strain loop substrate. presents square loop, is very consistent with result may be ascribed to distinct pathway ferroelastic domain switching (011)-oriented study provides new idea for design spintronic devices based on heterostructures.