Changes in magnetic properties of a 2D magnet in proximity to a 3D topological insulator
ORAL
Abstract
Interactions between three-dimensional topological insulators (TIs) and magnetism can induce exotic
topological phases like the quantum anomalous Hall or axion insulator states and might be used to
harness the properties of topological insulator surface states in spintronic devices. This coupling can also
lead to changes in the magnetic properties of a ferromagnet in proximity to a topological insulator.
Here, we report measurements of changes in magnetic properties of the 2d magnet Cr2Ge2Te6 in vdW
heterostructures with the 3D topological insulator BiSbTeSe2 . We observe enhancements in both the
magnetic anisotropy and the Curie temperature compared to isolated Cr2Ge2Te6 flakes. These
enhancements are tunable as the Fermi level is gated through the Dirac point of the topological
insulator. We analyze these findings In the context of interactions between the magnetic layer and
topological surface states.
topological phases like the quantum anomalous Hall or axion insulator states and might be used to
harness the properties of topological insulator surface states in spintronic devices. This coupling can also
lead to changes in the magnetic properties of a ferromagnet in proximity to a topological insulator.
Here, we report measurements of changes in magnetic properties of the 2d magnet Cr2Ge2Te6 in vdW
heterostructures with the 3D topological insulator BiSbTeSe2 . We observe enhancements in both the
magnetic anisotropy and the Curie temperature compared to isolated Cr2Ge2Te6 flakes. These
enhancements are tunable as the Fermi level is gated through the Dirac point of the topological
insulator. We analyze these findings In the context of interactions between the magnetic layer and
topological surface states.
*Research at Cornell was funded by the AFOSR/MURI Project 2DMagic (Grant FA9550-19-1-0390), US Department of Energy (DE-SC0017671), NSF (Grant DMR-2104268) and the Cornell Center for Materials Research (CCMR, supported by the NSF via Grant DMR-1719875) and utilized the shared facilities of both the CCMR and the Cornell NanoScale Facility, a member of the National Nanotechnology Coordinated Infrastructure (supported by the NSF via Grant NNCI-2025233). Research at the University of Utah was supported by the National Science Foundation under the Quantum Leap Big Idea Grant 1936383 as well as the Kuwait Foundation for the Advancement of Sciences (KFAS) under Project Code "CB20-68EO-01"
–
Presenters
-
Rakshit Jain
- Cornell University