2026, Tuning Spin Valley Coupling via Strain-Amplified Magnetic Proximity in Fe3GaTe2/WS2 Heterostructures, Small.

2026, Tuning Spin Valley Coupling via Strain-Amplified Magnetic Proximity in Fe₃GaTe₂/WS₂ Heterostructures, Small.

Abstract:

The magnetic proximity effect (MPE) allows nonmagnetic materials to acquire magnetic properties via interfacial exchange, providing a route to manipulate spin and valley degrees of freedom in two-dimensional heterostructures. However, MPE is typically limited by weak interfacial coupling, constraining the control of valley polarization and excitonic states in high-performance valleytronic devices. Here, we demonstrate that the MPE in the Fe₃GaTe₂/WS₂ heterostructure is effectively tuned as strain from a gold grating substrate enhances the interlayer coupling. The enhanced interlayer coupling promotes spin-dependent charge transfer in the MPE process, driving a pronounced longitudinal expansion of the WS₂ exciton valley polarization hysteresis loop and achieving a substantial modulation amplitude within the ±1 T magnetic field range. Simultaneously, the strain-enhanced MPE induces a pronouncedly enhanced Zeeman splitting, driving a giant Landé g-factor of WS₂ excitons up to -30. First-principles calculations attribute these effects to strain-induced band-structure reconfiguration and enhanced interlayer charge transfer. Our findings establish strain engineering as a powerful and precise approach to control the MPE, opening new avenues for advanced spin-valleytronic applications and next-generation low-dimensional quantum devices.

Keywords: Van der Waals ferromagnet, Strain engineering with gold grating, Magnetic proximity effect, Valley polarization, Valley-Zeeman, First principles calculation.

Link: https://onlinelibrary.wiley.com/doi/10.1002/smll.202511798

Small - 2026 - Zhang - Tuning Spin Valley Coupling via Strain‐Amplified Magnetic Proximity in Fe3GaTe2 WS2 Heterostructures.pdf