Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T68: Magnetic Manipulation and Excitations in 2D Magnets
11:30 AM–2:30 PM,
Thursday, March 9, 2023
Room: Room 420
Sponsoring
Unit:
GMAG
Chair: Kelly Luo, Cornell University
Abstract: T68.00004 : Spin Manipulation in van der Waals Ferromagnets and Antiferromagnets*
1:18 PM–1:54 PM
Presenter:
Daniel C Ralph
(Cornell University)
Author:
Daniel C Ralph
(Cornell University)
Our research group has developed techniques to integrate insulating vdW ferromagnets with layers of heavy metals or topological insulators. With the heavy metals we demonstrate efficient transmission of spin currents to generate spin-orbit torque on the vdW magnet. With the topological insulators we show that an insulating magnet can induce an anomalous Hall effect whose amplitude can be tuned by gate voltage with a strong peak near the Dirac point. This is the signature expected due to Berry curvature associated with an exchange gap in the topological surface states.
We are also investigating the spin-dynamics in the layered antiferromagnet CrSBr, which has biaxial magnetic anisotropy with an easy axis in-plane. Depending on the angle and magnitude of applied magnetic field, this anisotropy allows for a variety of states (antiparallel spin sublattices, spin-flop, and spin-flip), each with distinct behavior for the pair of antiferromagnetic resonances. We have characterized these modes using resonance measurements are exploring whether they can be addressed individually and excited by spin-orbit torque.
*Funding from the AFOSR/MURI Project 2DMagic (Grant FA9550-19-1-0390) and the NSF (DMR-2104268).
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