Description:
<jats:p>The half-metallic Heusler alloy Co<jats:sub>2</jats:sub>FeSi is an ideal material in spintronic devices due to its higher spin polarization, higher Curie temperature and lower damping parameters. In this work, the dynamic magnetism of Co<jats:sub>2</jats:sub>FeSi is modulated by electric field and it is demonstrated that the charge-spin conversion efficiency <jats:italic>ξ</jats:italic> is continuous and controllable by the electric field. We further find an extremely high <jats:italic>ξ</jats:italic> in ferromagnetic/ferroelectric (FM/FE) heterostructures, which could be ascribed to interfacial effect in FM/FE interface. Moreover, we investigate that the charge-spin conversion efficiency varies with the electric field in a butterfly-like behavior, which accords with the <jats:italic>S</jats:italic>–<jats:italic>E</jats:italic> curve of Pb(Mg<jats:sub>1/3</jats:sub>Nb<jats:sub>2/3</jats:sub>)O<jats:sub>3</jats:sub>-Pb<jats:sub>0.7</jats:sub>Ti<jats:sub>0.3</jats:sub>O<jats:sub>3</jats:sub>(PMN-PT) and could be attributed to strain effect. The modulation of charge-spin conversion efficiency in FM/FE heterostructures via electric field presents a profound potential for next-generation spintronic devices and applications of current-induced magnetization switching.</jats:p>