Switching the magnetization with an electric field in multiferroic heterostructures is desirable since it provides a possibility to achieve information storage with lower power consumption than traditional spintronic devices by using an electric current to drive magnetization rotation. Most of the existing studies, however, have been on multiferroic heterostructures containing either a single magnetic island or spatially well-separated multiple magnetic islands, where the effect of long-range magnetostatic interactions among magnetic islands (i.e. so-called cross-talking) can be ignored. Here we employ phase-field simulations to study the effect of magnetic interactions among islands on the electric-field-controlled magnetization switching in multiferroic heterostructures. As an example, we consider two interactive Co40Fe40B20(CoFeB) magnetic nanoislands grown on a PMN-PT ((0 0 1)-oriented Pb(Mg1/3Nb2/3)0.7Ti0.3O3) ferroelectric layer. We find that the distance between two neighboring nanoislands has to exceed a critical value to achieve an independent 180° magnetization switching in each nanoisland. The present work provides guidance for further experimental studies on the electric field control of magnetization and design of novel multiferroic devices.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films