Electric-field control magnetism anisotropy of cobalt based on giant electromechanical effects of Gd-doped ceria thin film

Abstract

Ionic conductors have recently exhibited giant electromechanical responses, while the strain-based electric-field control of magnetic properties in ferromagnetic/ionic conductor heterostructures is unclear. Here, a Gd-doped ceria (CGO) thin film with giant electromechanical responses was prepared by chemical solution deposition, wherein the maximum electrostrictive coefficient |M33| approaches 1.61 × 10−17 m2/V2 at 10 mHz with 4.56 % strain, and the pseudo-piezoelectric coefficient |d33| reaches 1078 pm/V. It is shown that the Co/CGO heterostructure reveals controllable electric-field-modulated magnetic anisotropy, with the converse magnetoelectric coupling coefficient reaching 2.13 × 10−8 s/m. This study provides a new way for miniaturizing low-frequency signal-based devices for seawater communication and developing novel electric-field-controlled magnetic memory devices.