Kavli Affiliate: Michael F. Crommie
| First 5 Authors: Tianye Wang, Qian Li, Mengmeng Yang, Yu Sun, Alpha T. N’Diaye
| Summary:
Atomically flat surfaces of van der Waals (vdW) materials pave an avenue for
addressing a long-standing fundamental issue of how a perfectly compensated
antiferromagnet (AFM) surface frustrates a ferromagnetic (FM) overlayer in
FM/AFM heterostructures. By revealing the AFM and FM spin structures separately
in vdW Fe5GeTe2/NiPS3 heterostructures, we find that C-type in-plane AFM NiPS3
develops three equivalent AFM domains which are robust against external
magnetic field and magnetic coupling with Fe5GeTe2. Consequently, spin
frustration at the Fe5GeTe2/NiPS3 interface was shown to develop a
perpendicular Fe5GeTe2 magnetization in the interfacial region that switches
separately from the bulk of the Fe5GeTe2 magnetizations. In particular, we
discover an unconventional spin twisting state that the Fe5GeTe2 spins twist
from perpendicular direction near the interface to in-plane direction away from
the interface in Fe5GeTe2/NiPS3. Our finding of the twisting spin texture is a
unique property of spin frustration in van der Waals magnetic heterostructures.
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