Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session B13: Materials (General) -- Modeling and Characterization
11:15 AM–2:15 PM,
Monday, March 4, 2019
BCEC Room: 153B
Sponsoring Unit: DMP
Chair: Dmitry Ovchinnikov, University of Washington
Abstract: B13.00004 : Spin-orbit-torque magnetic manipulation with 2D materials*
11:51 AM–12:27 PM
First, we discuss experiments in which the source of the spin-orbit torques are transition-metal dichalcogenide (TMD) materials with strong spin-orbit interactions, e.g., WTe2, TaTe2, MoTe2, and NbSe2. We demonstrate that the low crystalline symmetries of TMDs can allow components of spin-orbit torque that are forbidden for the more commonly-studied heavy metals and topological insulators. In particular, they can produce an out-of-plane antidamping torque of the type desired to drive the most efficient switching mode for magnets with perpendicular anisotropy. TMD materials with similar crystal structures can generate current-induced torques with a surprising range of contrasting symmetries, indicating that the torques depend not only on global broken symmetries but also on microscopic factors.
We will also discuss initial experiments in which recently-discovered 2D magnetic materials are integrated with spin-orbit materials. Using mechanically exfoliated thin flakes of the insulating 2D ferromagnet Cr2Ge2Te6combined into a bilayer structure with tantalum, we have observed current-induced deflections of the out-of-plane magnetic moment of Cr2Ge2Te6and characterized the strength of the spin-orbit torque.
*This work was performed with G. M. Stiehl, V. Gupta, M. H. D. Guimaraes, D. MacNeill, N. D. Reynolds, R. Li, S. Karimeddiny, J. Mittelstaedt, N. Sivadas, I. El Baggari, L. F. Kourkoutis, C. Fennie, J. Park, and R. A. Buhrman, with support from DOE and SRC/DARPA.
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