Electric field-induced magnetoresistance in spin-valve/piezoelectric multiferroic laminates for low-power spintronics

摘要

Electric field-induced magnetic anisotropy has been realized in the spin-valve-based {Ni_(80)Fe_(20)/Cu/ Fe_(40)Co_(50)/IrMn}/piezoelectric multiferroic laminates. In this system, electric-field control of magnetiza tion is accomplished by strain mediated magnetoelectric coupling. Practically, the magnetization in the magnetostrictive FeCo layer of the spin-valve structure rotates under an effective compressive stress caused by the inverse piezoelectric effect in external electrical fields. This phenomenon is evidenced by the magnetization and magnetoresistance changes under the electrical field applied across the piezoelectric layer. The result shows great potential for advanced low-power spintronic devices.