2D Amorphous MoO _3‐x /Ti ₃ C ₂ T _x MXene Heterostructure: Interface Charge Transfer‐Induced Carbon Defect‐Driven Enhancement of Ferromagnetism

ABSTRACT Two‐dimensional (2D) MXenes demonstrate remarkable potential for next‐generation spintronic devices. Nevertheless, the realization and stabilization of robust, room‐temperature ferromagnetism in MXene materials remain a fundamental challenge. Conventional approaches for regulating the magnetism of MXenes often lack precise control or result in unstable magnetic states. In this study, a supercritical CO ₂ ‐ assisted interface engineering strategy was employed to successfully fabricate a novel SC‐MoO _3‐x /Ti ₃ C ₂ T _x MXene heterostructure, which exhibits excellent room‐temperature ferromagnetic properties. First‐principles calculations indicate that interfacial Ti─O─Mo bonds trigger directional charge transfer from Ti ₃ C ₂ T _x to MoO _3‐x . This concurrently replenishes Mo 4d orbitals, augmenting ferromagnetism, and creates an electron‐deficient state on Ti atoms, which weakens Ti─C bonds and generates intrinsic carbon defects. These defects not only stabilize local spin‐polarized states but also act in synergy with the interface‐induced charge modulation, further enhancing the overall ferromagnetic response. This study offers atomic and electronic‐level insights into the synergistic mechanism between defect engineering and interfacial electronic modulation in 2D MXene systems.