We report giant reversible and permanent magnetic anisotropy reorientation in a magnetoelectric polycrystalline Ni thin film and (011)-oriented [Pb (Mg1/3 Nb2/3) O3](1-x) - [PbTiO 3] x heterostructure. The electric-field-induced magnetic anisotropy exhibits a 300 Oe anisotropy field and a 50% change in magnetic remanence. The important feature is that these changes in magnetization states are stable without the application of an electric field and can be reversibly switched by an electric field near a critical value (± Ecr). This giant reversible and permanent magnetization change is due to remanent strain originating from a non-180° ferroelectric polarization reorientation when operating the ferroelectric substrate in a specific non-linear regime below the electric coercive field.
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The first two authors contributed equally. The authors appreciate Mr. Joshua L. Hockel, Michael C. Emmons, Chin-Jui Hsu, Hyungsuk K. D. Kim, and Scott Keller for their valuable discussion. This work was supported by the Air Force Office of Scientific Research (AFOSR) under Grant No. FA9550-09-1-0677, managed by Byung-Lip (Les) Lee, and the Swiss National Science Foundation (SNF) under Grant No. PBNEP2-124323.