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: T68.00003 : Epitaxial growth of 2D van der Waals magnets and heterostructures with topological insulators*
12:42 PM–1:18 PM
Presenter:
Roland K Kawakami
(Ohio State University)
Author:
Roland K Kawakami
(Ohio State University)
Our initial studies of MnSe2 growth on Bi2Se3 showed a tendency for the interdiffusion of Mn into the Bi2Se3. [1]. This ultimately led to the synthesis of MnBi2Se4 (MBS), a new magnetic TI [2]. Interestingly, the vdW phase is not the thermodynamically stable phase and bulk crystals do not exist, so the epitaxial stabilization of MBS creates the opportunity to explore the magnetic and topological properties of this material. We find that MBS is a layered antiferromagnet, similar to MnBi2Te4, but a difference is that the magnetic moments lie in the plane of the film. Angle-resolved photoemission experiments show the presence of a topological surface state with Dirac dispersion.
For bilayers of 2D magnets and TIs, we have developed FGT films on Bi2Te3. We first optimized FGT by studying its growth on Ge(111) substrates, where we find that kinetic considerations play a major role [3]. Using cross-sectional scanning transmission electron microscopy and scanning tunneling microscopy, we optimize the FGT films to have atomically smooth surfaces and abrupt interfaces with the Ge(111). Subsequently, we have developed the growth of FGT on Bi2Te3 for the integration of 2D magnets with TIs. Interestingly, we observe room temperature ferromagnetism in FGT/Bi2Te3 heterostructures by varying the growth conditions.
*AFOSR MURI 2D MAGIC Grant No. FA9550-19-1-0390, U.S. DOE Office of Science, Basic Energy Sciences Grant No. DE-SC0016379, and the Center for Emergent Materials, an NSF MRSEC, under Grant No. DMR-2011876
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