Large voltage-induced modification of spin-orbit torques in Pt/Co/GdOx

TitleLarge voltage-induced modification of spin-orbit torques in Pt/Co/GdOx
Publication TypeJournal Article
Year of Publication2014
AuthorsEmori, S, Bauer, U, Woo, S, Beach, GSD
JournalApplied Physics Letters
Date Published2014/12/01/

We report on large modifications of current-induced spin-orbit torques in a gated Pt/Co/Gd-oxide microstrip due to voltage-driven O-2-migration. The Slonczewski-like and field-like torques are quantified using a low-frequency harmonic technique based on the polar magneto-optical Kerr effect. Voltage-induced oxidation of Co enhances the Slonczewski-like torque by as much as an order of magnitude and simultaneously reduces the anisotropy energy barrier by a factor of similar to 5. Such magneto-ionic tuning of interfacial spin-orbit effects may significantly enhance the efficiency of magnetization switching and provide additional degrees of freedom in spintronic devices. (C) 2014 AIP Publishing LLC.