Effect of rare earth metal on the spin-orbit torque in magnetic heterostructures

TitleEffect of rare earth metal on the spin-orbit torque in magnetic heterostructures
Publication TypeJournal Article
Year of Publication2016
AuthorsUeda, K, Pai, C-F, Tan, AJun, Mann, M, Beach, GSD
JournalApplied Physics Letters
Volume108
Issue23
Pagination232405
Date Published2016/06/06/
ISBN Number0003-6951
Keywordsdomain-wall, magnitude, multilayers
Abstract

We report the effect of the rare earth metal Gd on current-induced spin-orbit torques (SOTs) in perpendicularly magnetized Pt/Co/Gd heterostructures, characterized using harmonic measurements and spin-torque ferromagnetic resonance (ST-FMR). By varying the Gd metal layer thickness from 0 nm to 8 nm, harmonic measurements reveal a significant enhancement of the effective fields generated from the Slonczewski-like and field-like torques. ST-FMR measurements confirm an enhanced effective spin Hall angle and show a corresponding increase in the magnetic damping constant with increasing Gd thickness. These results suggest that Gd plays an active role in generating SOTs in these heterostructures. Our finding may lead to spin-orbitronics device application such as non-volatile magnetic random access memory, based on rare earth metals. Published by AIP Publishing.

Short TitleAppl. Phys. Lett.