Spin Hall torque magnetometry of Dzyaloshinskii domain walls

TitleSpin Hall torque magnetometry of Dzyaloshinskii domain walls
Publication TypeJournal Article
Year of Publication2014
AuthorsEmori, S, Martinez, E, Lee, K-J, Lee, H-W, Bauer, U, Ahn, S-M, Agrawal, P, Bono, DC, Beach, GSD
JournalPhysical Review B
Volume90
Issue18
Pagination184427
Date Published2014/11/25/
Abstract

Current-induced domain wall motion in the presence of the Dzyaloshinskii-Moriya interaction (DMI) is experimentally and theoretically investigated in heavy-metal/ferromagnet bilayers. The angular dependence of the current-induced torque and the magnetization structure of Dzyaloshinskii domain walls are described and quantified simultaneously in the presence of in-plane fields. We show that the DMI strength depends strongly on the heavy metal, varying by a factor of 20 between Ta and Pa, and that strong DMI leads to wall distortions not seen in conventional materials. These findings provide essential insights for understanding and exploiting chiral magnetism for emerging spintronics applications.