The magnetic proximity effect (MPE) in two-dimensional transition metal dichalcogenides (TMDCs) offers a compelling route to manipulate spin and valley degrees of freedom for next-generation quantum technologies. While TMDCs interfaced with magnetic materials provide a versatile platform for tailoring interfacial magnetic interactions, precise control of MPE remains elusive, particularly in the presence of dual magnetic interfaces. Here, we report the emergence of complex magneto-optical phenomena in a CrOCl–MoS2–YIG heterostructure, where MoS2 is simultaneously interfaced with an antiferromagnet (CrOCl) and a ferromagnet (YIG). The CrOCl layer induces strong p-type doping in MoS2, resulting in a 14-fold enhancement of photoluminescence quantum efficiency at cryogenic temperatures. Valley-polarized photoluminescence spectra under magnetic field show that pronounced sensitivity of MoS2 excitons to the magnetic ordering of CrOCl, which reveals the competitive interactions at the CrOCl–MoS2 and MoS2–YIG interfaces. Furthermore, interfacial symmetry breaking at the CrOCl–MoS2 boundary induces pronounced exciton linear polarization, with the polarization axis rotating up to 90° under magnetic tuning, highlighting the synergistic effect of valley coherence and Faraday effect. Our findings reveal the complex interfacial physics arising from dual magnetic proximity and provide a versatile strategy for realizing magnetically reconfigurable valley polarization in two-dimensional semiconductors.
Li et al. (2025) studied this question.