Electric field control of magnetic domain wall motion via modulation of the Dzyaloshinskii-Moriya interaction

Authors
Tomohiro Koyama*, Yoshinobu Nakatani, Jun’ichi Ieda, Daichi Chiba 

Abstract
We show that the electric field (EF) can control the domain wall (DW) velocity in a Pt/Co/Pd asymmetric structure. With the application of a gate voltage, a substantial change in DW velocity up to 50 m/s is observed, which is much greater than that observed in previous studies. Moreover, modulation of a DW velocity exceeding 100 m/s is demonstrated in this study. An EF-induced change in the interfacial Dzyaloshinskii-Moriya interaction (DMI) up to several percent is found to be the origin of the velocity modulation. The DMI-mediated velocity change shown here is a fundamentally different mechanism from that caused by EF-induced anisotropy modulation. Our results will pave the way for the electrical manipulation of spin structures and dynamics via DMI control, which can enhance the performance of spintronic devices.

Science Advances : http://advances.sciencemag.org/content/4/12/eaav0265