1. Giant magnetoelectric effect in an L 2₁-ordered Co₂FeSi/Pb(Mg₁/₃Nb₂/₃)O₃-PbTiO₃ multiferroic heterostructure
- Author
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Usami, T., Fujii, S., Yamada, S., Shiratsuchi, Y., Nakatani, R., and Hamaya, K.
- Abstract
T. Usami, S. Fujii, S. Yamada, Y. Shiratsuchi, R. Nakatani, and K. Hamaya, Appl. Phys. Lett. 118, 142402 (2021); https://doi.org/10.1063/5.0044094, 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.
- Published
- 2021