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We experimentally show a giant magnetoelectric (ME) effect at room temperature in an interfacial multiferroic heterostructure consisting of L21-ordered Co2FeSi and Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT). Molecular beam epitaxy growth at 400 °C enables us to obtain epitaxial and L21-ordered Co2FeSi films on PMN-PT(001). For the epitaxial Co2FeSi/PMN-PT heterostructure, the remanent magnetization state can be largely modulated by varying electric fields. We note that the room-temperature ME coupling coefficient (α) is estimated to be 6.0–6.3 × 10 − 6 s/m, comparable to the highest α value reported previously. Nonvolatile and repeatable magnetization changes in remanent states are also demonstrated. These results will pave the way for room-temperature electric-field control of the magnetization of half-metallic Heusler alloys in high-performance spintronic devices. [ABSTRACT FROM AUTHOR]

Multiferroic heterostructures consisting of Co/Pd multilayers on Pb(Mg 1 / 3 Nb 2 / 3)O 3 -PbTiO 3 (011) substrates are experimentally investigated. The converse magnetoelectric (CME) effect is characterized by anomalous Hall effect measurements with application of an electric field (E). The remanent magnetization state for the [Co(0.8 nm)/Pd(2 nm)] multilayer is significantly modulated by the application of E. The room-temperature CME coupling coefficient (α E) is estimated to be 1.0–1.1 × 10−6 s/m, which is the largest among those of multiferroic heterostructures with perpendicular magnetic anisotropy. • Multiferroic heterostructures consisting of Co/Pd multilayers on PMN-PT are obtained. • The remanent magnetization state is modulated by an electric field. • The large converse magnetoelectric coupling coefficient is demonstrated. [ABSTRACT FROM AUTHOR]